Method and apparatus for manufacturing bonded laminated cores

Abstract

Provided is a method for manufacturing a bonded laminate core in which a plurality of steel sheet parts are obtained by pressing a steel sheet strip, to one or both surfaces of which a press working oil is applied, and applying an adhesive to one surface of the steel sheet strip, and then the steel sheet parts are stacked and bonded to produce a bonded laminate core, wherein a curing accelerator that has an average viscosity of 0.01-1.00 Pa·s is applied to one or both surfaces of the steel sheet strip prior to application of the press working oil.

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for manufacturing a bonded laminated core. This application claims priority based on Patent Application No. 2021-068108, filed in Japan on April 14, 2021, the contents of which are incorporated herein by reference. [Background technology]

[0002] For example, a rotating electric machine used as an electric motor includes a laminated core. This laminated core is manufactured by punching a strip-shaped steel plate into a predetermined shape in several steps while intermittently feeding the strip-shaped steel plate, and stacking the obtained steel plate parts. The steel plate parts are fixed to each other by welding, bonding, crimping, etc., but among these, a fixing method by bonding has attracted attention from the viewpoint of effectively suppressing iron loss of the laminated core.

[0003] For example, Patent Document 1 listed below discloses a method for producing a metal sheet laminate by sequentially performing multiple press processes on a hoop material with press processing oil applied to one or both sides, applying an adhesive to one side of the hoop material, performing an outline punching process to obtain a metal sheet, and stacking and adhering a predetermined number of the metal sheets, in which a hardening accelerator is added to the press processing oil. According to this method for manufacturing a metal sheet laminate, by adding a hardening accelerator to the press processing oil, bonding between the metal sheets is achieved quickly and strongly without removing the press processing oil, and it is explained that this makes it possible to simplify the manufacturing process and reduce the size of the dies in the progressive die device, thereby improving product quality and productivity and reducing the size of the manufacturing equipment.

[0004] Furthermore, the following Patent Document 2 discloses a punching and laminating press method for punching steel plate parts of a predetermined shape from an intermittently fed strip steel plate and laminating the steel plate parts, the punching and laminating press method including a first application step of applying either an adhesive or a hardening accelerator for promoting hardening of the adhesive to the underside of the strip steel plate upstream of a press processing position where the steel plate parts are punched from the strip steel plate, and a second application step of applying the other of the adhesive and the hardening accelerator to the upper surface of the strip steel plate at the press processing position. It is explained that this punching and laminating press method makes it possible to significantly shorten the adhesive curing time by performing the first and second application processes, thereby increasing the productivity of cores manufactured by stacking multiple steel plate parts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent No. 4648765 [Patent Document 2] Japanese Patent No. 6164029 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the manufacturing method of the metal sheet laminate in the above-mentioned Patent Document 1, the adhesion between the metal sheets can be rapidly achieved by using a hardening accelerator. Since the hardening accelerator is applied in a diluted state by adding press processing oil, if a higher hardening acceleration effect is required, the content of the hardening accelerator needs to be increased to a considerable amount. However, in this case, the proportion of the press processing oil is reduced, which may affect the punching workability when punching the metal sheets. In addition, the punching lamination press method of Patent Document 2 claims to be able to significantly shorten the curing time of the adhesive. However, even in this case, no consideration is given at all to the effect of press oil, which is essential for punching, on the curing accelerator.

[0007] In this way, in order to further increase the productivity of bonded laminated cores, it is necessary to more effectively utilize the lubricating function of the press processing oil when punching the steel sheets and the hardening accelerator when bonding the steel sheets. However, in the past, sufficient consideration had not been given to the application form of the hardening accelerator.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a method and an apparatus for manufacturing bonded laminated cores that can achieve higher productivity while ensuring sufficient adhesive strength when manufacturing bonded laminated cores. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention employs the following means. (1) A method for producing a bonded laminated core according to one aspect of the present invention comprises the steps of: A method for manufacturing an adhesive laminated core, comprising the steps of: pressing a strip of steel plate having press working oil applied to one or both sides thereof; applying an adhesive to one side of the strip of steel plate to obtain a plurality of steel plate parts; and laminating and bonding the steel plate parts together, the method comprising the steps of: A hardening accelerator having an average viscosity of 0.01 Pa·s to 100 Pa·s is applied to one or both sides of the strip steel sheet before the press processing oil is applied. According to the adhesive laminated core manufacturing method described in (1) above, since the average viscosity of the curing accelerator is set to 0.01 Pa·s or more, the curing accelerator can be maintained in a state in which mixing with the press processing oil is suppressed. Therefore, the concentration of the curing accelerator before stacking and bonding each steel plate component can be maintained high. In addition, since the average viscosity of the curing accelerator is suppressed to 100 Pa·s, it is possible to suppress the viscosity of the curing accelerator from interfering with the mixing of the curing accelerator and the adhesive when stacking and bonding each steel plate component. In this way, when stacking and bonding each steel plate component, the curing accelerator can be reliably mixed with the adhesive while maintaining a high concentration, so that high adhesive strength can be developed early. Therefore, it is possible to obtain higher productivity while ensuring sufficient adhesive strength.

[0010] (2) In the method for producing an adhesive laminated core described in (1) above, the following may be performed: The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate component having a first surface, the hardening accelerator disposed on the first surface, and the press processing oil disposed on the hardening accelerator; a second step of providing the second steel sheet component having a second surface and the adhesive disposed on the second surface; A third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; has. According to the method for manufacturing a bonded laminated core described in (2) above, the hardening accelerator does not dissolve in the press processing oil in the first step, and the decrease in concentration due to the press processing oil is suppressed. Therefore, in the third step, the first steel sheet component and the second steel sheet component can be bonded together while the hardening accelerator maintains its original high concentration.

[0011] (3) In the method for producing an adhesive laminated core described in (1) above, the following may be performed: The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate component having a first surface, the hardening accelerator disposed on the first surface, the press processing oil disposed on the hardening accelerator, and the adhesive disposed on the press processing oil; A second step of providing the second steel plate component having a second surface; A third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; has. According to the method for producing a bonded laminated core described in (3) above, the same effects as those of the method for producing a bonded laminated core described in (2) above can be obtained.

[0012] (4) In the method for producing an adhesive laminated core described in (1) above, the following may be performed: The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate component having a first surface and the hardening accelerator disposed on the first surface; a second step of preparing the second steel sheet component having a second surface, the press oil disposed on the second surface, and the adhesive disposed on the press oil; A third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; has. According to the method for producing a bonded laminated core described in (4) above, the same effects as those of the method for producing a bonded laminated core described in (2) above can be obtained.

[0013] (5) In the method for producing an adhesive laminated core described in (1) above, the following may be performed: The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate component having a first surface, the hardening accelerator disposed on the first surface, and the press processing oil disposed on the hardening accelerator; a second step of preparing the second steel sheet component having a second surface, the press oil disposed on the second surface, and the adhesive disposed on the press oil; A third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; has. According to the method for producing a bonded laminated core described in (5) above, the same effects as those of the method for producing a bonded laminated core described in (2) above can be obtained.

[0014] (6) In the method for producing an adhesive laminated core described in (1) above, the following may be performed: The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate component having a first surface, the hardening accelerator disposed on the first surface, the press processing oil disposed on the hardening accelerator, and the adhesive disposed on the press processing oil; a second step of preparing the second steel sheet component having a second surface and the press processing oil disposed on the second surface; A third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; has. According to the method for producing a bonded laminated core described in (6) above, the same effects as those of the method for producing a bonded laminated core described in (2) above can be obtained.

[0015] (7) In the method for producing a bonded laminated core according to any one of the above (1) to (6), the adhesive may be an anaerobic adhesive or an instant adhesive. According to the method for producing an adhesive laminated core described in (7) above, it is possible to relatively increase the amount of the curing accelerator without affecting the processability, thereby shortening the curing time and improving the adhesive strength.

[0016] (8) In the method for producing an adhesive laminated core described in (7) above, the following may be performed: the adhesive is an anaerobic adhesive, The cure accelerator comprises an active ingredient that promotes anaerobic cure selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof. The active ingredient for promoting anaerobic hardening is selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof. It may be preferably selected from copper, iron, vanadium, cobalt, chromium, silver, and manganese, and combinations thereof. It may be preferably copper, iron, vanadium, cobalt, and chromium, and combinations thereof. It is preferably provided in the form of a metal oxide or salt. It is preferably one or a combination of two or more selected from vanadium acetylacetonate, vanadyl acetylacetonate, vanadyl stearate, vanadium propoxide, vanadium butoxide, vanadium pentoxide, cobalt naphthenate, manganese naphthenate, copper hexanoate, copper(II) bis(2-ethylhexanoate), and the like. According to the adhesive laminated core manufacturing method described in (8) above, the anaerobic adhesive hardens quickly and completely, making it extremely excellent for manufacturing processes that require short manufacturing times or suppression of outgassing, thereby improving productivity.

[0017] (9) In the method for producing an adhesive laminated core described in (7) above, the following may be performed: The adhesive is an instant adhesive, The curing accelerator contains an active ingredient that accelerates the curing of the instant adhesive, selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl para-toluidine, diethyl para-toluidine, and N,N-diethylaniline; acid amides such as trichloroacetamide; organic imides such as succinimide; quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride; and combinations thereof. Specific examples of the active ingredient that accelerates the hardening of the instant adhesive include organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, N,N-diethylaniline, acid amides such as trichloroacetamide, organic imides such as succinimide, quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride, and combinations thereof. Preferably, one or a combination of two or more selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, N,N-diethylaniline, etc. may be used. According to the adhesive laminated core manufacturing method described in (9) above, the instant adhesive hardens quickly and completely, making it extremely excellent for manufacturing processes that require short manufacturing times or suppression of outgassing, and thus improving productivity.

[0018] (10) In the bonded laminated core manufacturing method according to any one of (1) to (9) above, the bonded laminated core may be a stator for a rotating electric machine. According to the adhesive laminated core manufacturing method described in (10) above, higher productivity can be achieved while ensuring sufficient adhesive strength, making it possible to manufacture stators for rotating electric machines that have high performance but low manufacturing costs.

[0019] (11) An apparatus for manufacturing a bonded laminated core according to one aspect of the present invention comprises: An apparatus for manufacturing a bonded laminated core having a plurality of steel plate parts punched out from a strip-shaped steel plate, A press working oil application unit that applies press working oil to one side or both sides of the strip steel plate; a press working unit that applies press working to the strip steel plate; an adhesive application section that applies an adhesive to one surface of the strip steel plate; a hardening accelerator application section that applies a hardening accelerator having an average viscosity of 0.01 Pa s to 100 Pa s to one or both sides of the strip steel sheet before the strip steel sheet reaches the press processing oil application section; Equipped with. According to the adhesive laminated core manufacturing apparatus described in (11) above, the average viscosity of the hardening accelerator applied to the strip-shaped steel plate in the hardening accelerator application section is set to 0.01 Pa·s or more, so that the hardening accelerator can be maintained in a state in which mixing with the press processing oil is suppressed. Therefore, the concentration of the hardening accelerator before stacking and bonding each steel plate component can be maintained high. In addition, since the average viscosity of the hardening accelerator is suppressed to 100 Pa·s or less, it is possible to suppress the viscosity of the hardening accelerator from preventing the hardening accelerator from mixing with the adhesive when stacking and bonding each steel plate component. In this way, when stacking and bonding each steel plate component, the hardening accelerator can be reliably mixed with the adhesive while maintaining a high concentration, so that high adhesive strength can be developed early. Therefore, it is possible to obtain higher productivity while ensuring sufficient adhesive strength.

[0020] (12) In the bonded laminated core manufacturing apparatus described in (11) above, the adhesive may be an anaerobic adhesive or an instant adhesive. According to the method for producing an adhesive laminated core described in (12) above, the amount of the curing accelerator can be relatively increased without affecting processability, thereby shortening the curing time and improving the adhesive strength.

[0021] (13) In the adhesive laminated core manufacturing apparatus described in (12) above, the following may be performed: the adhesive is an anaerobic adhesive, The cure accelerator comprises an active ingredient that promotes anaerobic cure selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof. The active ingredient for promoting anaerobic hardening is selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof. It may be preferably selected from copper, iron, vanadium, cobalt, chromium, silver, and manganese, and combinations thereof. It may be preferably copper, iron, vanadium, cobalt, and chromium, and combinations thereof. It is preferably provided in the form of a metal oxide or salt. It is preferably one or a combination of two or more selected from vanadium acetylacetonate, vanadyl acetylacetonate, vanadyl stearate, vanadium propoxide, vanadium butoxide, vanadium pentoxide, cobalt naphthenate, manganese naphthenate, copper hexanoate, copper(II) bis(2-ethylhexanoate), and the like. According to the adhesive laminated core manufacturing apparatus described in (13) above, the anaerobic adhesive hardens quickly and completely, making it extremely excellent for production that requires short production times or suppression of outgassing, and thus improving productivity.

[0022] (14) In the adhesive laminated core manufacturing apparatus described in (12) above, the following may be performed: The adhesive is an instant adhesive, The curing accelerator contains an active ingredient that accelerates the curing of the instant adhesive, selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl para-toluidine, diethyl para-toluidine, and N,N-diethylaniline; acid amides such as trichloroacetamide; organic imides such as succinimide; quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride; and combinations thereof.

[0023] (15) In the bonded laminated core manufacturing apparatus according to any one of (11) to (14) above, the bonded laminated core may be a stator for a rotating electric machine. According to the adhesive laminated core manufacturing apparatus described in (15) above, higher productivity can be achieved while ensuring sufficient adhesive strength, making it possible to manufacture stators for rotating electric machines that have high performance but low manufacturing costs. Effect of the Invention

[0024] According to the above-mentioned aspects of the present invention, it is possible to provide a method and an apparatus for manufacturing a bonded laminated core, which can ensure sufficient adhesive strength and achieve higher productivity when manufacturing a bonded laminated core. [Brief description of the drawings]

[0025] [Figure 1] 1 is a cross-sectional view of a rotating electric machine including a stator bonded laminated core manufactured in accordance with each embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the stator bonded laminated core. [Diagram 3] FIG. 1 is a side view of a bonded laminated core manufacturing apparatus 100 used in each embodiment of the present invention. [Figure 4] FIG. 2 is a side view of another bonded laminated core manufacturing apparatus 200 used in each embodiment of the present invention. [Diagram 5] 1 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a first embodiment of the present invention. [Figure 6] 5 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a second embodiment of the present invention. [Figure 7] 10 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a third embodiment of the present invention. [Figure 8] 10 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a fourth embodiment of the present invention. [Figure 9] 10 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a fifth embodiment of the present invention. [Figure 10] 13 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a sixth embodiment of the present invention. [Figure 11]13 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a seventh embodiment of the present invention. [Figure 12] 13 is a flowchart illustrating a method for manufacturing a bonded laminated core according to an eighth embodiment of the present invention. [Figure 13] 13 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a ninth embodiment of the present invention. [Figure 14] 13 is a flowchart illustrating a method for manufacturing a bonded laminated core according to a tenth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, a method for manufacturing a bonded laminated core according to each embodiment of the present invention will be described with reference to the drawings. First, a stator bonded laminated core (bonded laminated core, stator for a rotating electric machine) manufactured in each embodiment will be described with reference to Figs. 1 and 2. Then, a bonded laminated core manufacturing apparatus 100, 200 used in each embodiment will be described, and then a bonded laminated core manufacturing method will be described for each embodiment.

[0027] [Adhesive laminated core for stator] Fig. 1 is a cross-sectional view of a rotating electrical machine 10 including a stator adhesive laminated core 21 manufactured in each embodiment. Fig. 2 is a side view of the stator adhesive laminated core 21. 1 is an electric motor, specifically an AC motor, more specifically a synchronous motor, and even more specifically a permanent magnet field type motor. This type of motor is preferably used in, for example, electric vehicles.

[0028] 1, the rotating electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotating shaft 60. The stator 20 and the rotor 30 are housed in the case 50. The stator 20 is fixed within the case 50. 1, the rotating electric machine 10 is an inner rotor type in which the rotor 30 is located radially inside the stator 20. However, the rotating electric machine 10 may be an outer rotor type in which the rotor 30 is located outside the stator 20. Also, here, the rotating electric machine 10 is illustrated as a 12-pole, 18-slot three-phase AC motor. However, the number of poles, the number of slots, the number of phases, etc. can be changed as appropriate. The rotating electric machine 10 can rotate at a rotation speed of 1000 rpm by applying an excitation current with an effective value of 10 A and a frequency of 100 Hz to each phase, for example.

[0029] The stator 20 includes a stator adhesive laminated core 21 and a winding (not shown). The stator adhesive laminated core 21 includes an annular core back portion 22 and a plurality of teeth portions 23. Hereinafter, the direction of the central axis O of the stator adhesive laminated core 21 (or the core back portion 22) will be referred to as the axial direction, the radial direction (direction perpendicular to the central axis O) of the stator adhesive laminated core 21 (or the core back portion 22) will be referred to as the radial direction, and the circumferential direction (direction going around the central axis O) of the stator adhesive laminated core 21 (or the core back portion 22) will be referred to as the circumferential direction.

[0030] The core back portion 22 is formed in an annular shape when viewed in a plan view of the stator 20 in the axial direction. The multiple teeth portions 23 protrude radially inward from the inner circumference of the core back portion 22. The multiple teeth portions 23 are arranged at equal angular intervals in the circumferential direction. In the example of FIG. 1, 18 teeth portions 23 are provided at central angle intervals of 20 degrees about the central axis O. The multiple teeth portions 23 are formed to have the same shape and size as one another. Therefore, the multiple teeth portions 23 have the same thickness dimension as one another. The winding is wound around the teeth portion 23. The winding may be a concentrated winding or a distributed winding.

[0031] The rotor 30 is disposed radially inside the stator 20 (the stator adhesive laminated core 21). The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32. The rotor core 31 is formed in an annular (circular) shape and is disposed coaxially with the stator 20. A rotating shaft 60 is disposed within the rotor core 31. The rotating shaft 60 is fixed to the rotor core 31. The multiple permanent magnets 32 are fixed to the rotor core 31. In the example of Fig. 1, a pair of the permanent magnets 32 forms one magnetic pole. The multiple pairs of permanent magnets 32 are arranged at equal angular intervals in the circumferential direction. In the example of Fig. 1, 12 pairs of permanent magnets 32 (24 in total) are provided at central angle intervals of 30 degrees around the central axis O.

[0032] In the example of FIG. 1, an embedded magnet type motor is used as the permanent magnet field type motor. A rotor core 31 is formed with a plurality of through holes 33 that pass through the rotor core 31 in the axial direction. The plurality of through holes 33 are provided corresponding to the arrangement of the plurality of permanent magnets 32. Each permanent magnet 32 ​​is fixed to the rotor core 31 while being arranged in the corresponding through hole 33. Each permanent magnet 32 ​​can be fixed to the rotor core 31 by, for example, bonding the outer surface of the permanent magnet 32 ​​to the inner surface of the through hole 33 with an adhesive. Note that a surface magnet type motor may be used as the permanent magnet field type motor instead of the embedded magnet type.

[0033] Both the stator adhesive laminated core 21 and the rotor core 31 are laminated cores. For example, the stator adhesive laminated core 21 is formed by laminating a plurality of electromagnetic steel sheets 40 in a lamination direction, as shown in FIG. The lamination thickness (total length along the central axis O) of each of the stator adhesive laminated core 21 and the rotor core 31 is, for example, 50.0 mm. The outer diameter of the stator adhesive laminated core 21 is, for example, 250.0 mm. The inner diameter of the stator adhesive laminated core 21 is, for example, 165.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values ​​are merely examples, and the lamination thickness, outer diameter, and inner diameter of the stator adhesive laminated core 21 and the lamination thickness, outer diameter, and inner diameter of the rotor core 31 are not limited to these values. Here, the inner diameter of the stator adhesive laminated core 21 is based on the tip of the teeth portion 23 in the stator adhesive laminated core 21. In other words, the inner diameter of the stator adhesive laminated core 21 is the diameter of a virtual circle inscribed in the tip of all the teeth portions 23.

[0034] Each of the electromagnetic steel sheets 40 forming the stator adhesive laminated core 21 and the rotor core 31 is formed, for example, by punching a strip-shaped steel sheet as a base material. A known electromagnetic steel sheet can be used as the electromagnetic steel sheet 40. The chemical composition of the electromagnetic steel sheet 40 is shown below in mass %, and contains 2.5% to 3.9% Si by mass %. By setting the chemical composition within this range, the yield strength of each of the electromagnetic steel sheets 40 can be set to 380 MPa or more and 540 MPa or less.

[0035] Silicon: 2.5% to 3.9% Al: 0.001% to 3.0% Mn: 0.05% to 5.0% Remainder: Fe and impurities

[0036] In this embodiment, a non-oriented electromagnetic steel sheet is used as the electromagnetic steel sheet 40. As the non-oriented electromagnetic steel sheet, a non-oriented electrical steel strip according to JIS C2552:2014 can be used. However, a directional electromagnetic steel sheet may be used as the electromagnetic steel sheet 40 instead of the non-oriented electromagnetic steel sheet. In this case, as the directional electromagnetic steel sheet, a directional electrical steel strip according to JIS C2553:2012 can be used.

[0037] In order to improve the workability of the laminated core and the iron loss of the laminated core, both sides of the magnetic steel sheets 40 are coated with a phosphate-based insulating coating. Examples of the material that can be used to form the insulating coating include (1) inorganic compounds, (2) organic resins, and (3) mixtures of inorganic compounds and organic resins. Examples of inorganic compounds include (1) composites of dichromate and boric acid, and (2) composites of phosphate and silica. Examples of organic resins include epoxy resins, acrylic resins, acrylic styrene resins, polyester resins, silicone resins, and fluorine resins.

[0038] [Adhesive laminated core manufacturing equipment 100] As shown in FIG. 3, the bonded laminated core manufacturing apparatus 100 of this embodiment includes a strip steel plate supply section 110, a hardening accelerator application section 120, a drive section (not shown), a press processing oil application section 130, a press processing section 140, an adhesive application section 150, and a laminated bonding section 160. In this bonded laminated core manufacturing apparatus 100, an adhesive is applied to the lower surface of the strip-shaped steel plate M by an adhesive application section 150. On the other hand, in a bonded laminated core manufacturing apparatus 200 described later, an adhesive is applied to the upper surface of the strip-shaped steel plate M by an adhesive application section 250.

[0039] As shown in Fig. 3, the steel strip supply section 110 supports a hoop material F around which a steel strip M, which is the raw material for the electromagnetic steel sheet (steel sheet component) 40, is wound, and feeds out the steel strip M toward the right side of the paper in Fig. 3. In the following description, the right side of the paper, which is the feed direction of the steel strip M, may be referred to as the downstream side, and the left side of the paper, which is the opposite direction, may be referred to as the upstream side. The steel strip M fed downstream from the steel strip supply section 110 is a steel sheet having the above-mentioned chemical composition, and both sides of the steel strip M are coated with the above-mentioned insulating coating.

[0040] The hardening accelerator application section 120 includes a tank 121 , a switching valve 122 , an upper surface application line 123 and an upper nozzle 124 , and a lower surface application line 125 and a lower nozzle 126 . The tank 121 stores a hardening accelerator a. The curing accelerator a is a drug containing an active ingredient for accelerating the curing of the adhesive and a viscosity agent as the main components, and has an average viscosity of 0.01 Pa·s to 100 Pa·s. The viscosity agent is a drug having an average viscosity of 0.1 Pa·s to 1000 Pa·s or a particle that is solid at room temperature, and for example, an acrylic acid polymer-based thickener, acrylic beads, or a filler such as silica can be suitably used. The average viscosity of the curing accelerator is preferably 0.5 Pa·s or more, more preferably 2 Pa·s or more, and particularly preferably 5 Pa·s or more. The average viscosity of the curing accelerator is preferably 50 Pa·s or less, and more preferably 10 Pa·s or less. A viscosity agent and the like are added to the active ingredient for curing acceleration to form curing accelerator a, but other additives such as preservatives may also be mixed in. The average viscosity of the curing accelerator a is measured by performing measurements three times at a test temperature of 23° C. using a rotational viscometer as described in JIS K 7117:1999, and calculating the average value.

[0041] The curing accelerator used is one that corresponds to the type of adhesive applied by the adhesive application unit 150. That is, when an anaerobic adhesive is used, a curing accelerator containing an active ingredient that promotes anaerobic curing is used. When a 2-cyanoacrylate adhesive (instant adhesive) is used, a curing accelerator containing an active ingredient that promotes curing of the 2-cyanoacrylate adhesive is used. The curing accelerator promotes instant curing of the adhesive by mixing with the anaerobic adhesive or the 2-cyanoacrylate adhesive.

[0042] As a curing accelerator for anaerobic adhesives, the active ingredient that accelerates anaerobic curing is selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof. Preferably, it may be selected from copper, iron, vanadium, cobalt, chromium, silver, and manganese, and combinations thereof. Desirably, it may be copper, iron, vanadium, cobalt, and chromium, and combinations thereof. Desirably, it is provided in the form of a metal oxide or salt. Preferably, it is exemplified by one or a combination of two or more selected from vanadium acetylacetonate, vanadyl acetylacetonate, vanadyl stearate, vanadium propoxide, vanadium butoxide, vanadium pentoxide, cobalt naphthenate, manganese naphthenate, copper hexanoate, copper (II) bis(2-ethylhexanoate), and the like. The curing accelerator promotes instantaneous curing of the adhesive by mixing with the anaerobic adhesive.

[0043] On the other hand, the curing accelerator for 2-cyanoacrylate adhesives contains an active ingredient that promotes the curing of 2-cyanoacrylate adhesives selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, and N,N-diethylaniline, acid amides such as trichloroacetamide, organic imides such as succinimide, quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride, and combinations thereof. Preferably, one or a combination of two or more selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, and N,N-diethylaniline is used.

[0044] As shown in Fig. 3, the upper nozzle 124 is disposed facing vertically downward so that its discharge port faces the upper surface of the strip steel sheet M. The upper nozzle 124 has multiple discharge ports, and can apply the hardening accelerator a in dots to the upper surface of the strip steel sheet M over its entire width direction. An upper surface coating line 123 is connected to the upper nozzle 124. The upper surface coating line 123 is connected to the tank 121 via a switching valve 122. The lower nozzle 126 is disposed facing vertically upward so that its discharge port faces the underside of the strip steel sheet M. The lower nozzle 126 has multiple discharge ports, and can apply the hardening accelerator a in dots to the underside of the strip steel sheet M over its entire width direction. A lower surface coating line 125 is connected to the lower nozzle 126. The lower surface coating line 125 is connected to the tank 121 via a switching valve 122. The discharge port of the lower nozzle 126 faces the discharge port of the upper nozzle 124 with the strip steel sheet M sandwiched therebetween.

[0045] The switching valve 122 can switch the supply destination of the hardening accelerator a in the tank 121 to either the upper surface coating line 123 or the lower surface coating line 125 by being switched. When the hardening accelerator a is supplied to the upper surface coating line 123 side via the switching valve 122, the hardening accelerator a is applied in a large number of dots only to the upper surface of the strip steel sheet M from the upper nozzle 124. On the other hand, when the hardening accelerator a is supplied to the lower surface coating line 125 side via the switching valve 122, the hardening accelerator a is applied in a large number of dots from the lower nozzle 126 only to the lower surface of the strip steel sheet M.

[0046] The drive unit is disposed at a position D between the hardening accelerator application unit 120 and the press working oil application unit 130. The drive unit intermittently sends out the strip steel sheet M from the hardening accelerator application unit 120 toward the press working oil application unit 130 toward the right direction of the drawing. Note that the hardening accelerator a has been applied to only one of the upper and lower surfaces of the strip steel sheet M sent out from the hardening accelerator application unit 120 before entering the drive unit. When the hardening accelerator a is applied to the upper surface of the strip steel sheet M, it is not applied to the lower surface. On the other hand, when the hardening accelerator a is applied to the lower surface of the strip steel sheet M, it is not applied to the upper surface. In either of these cases, the active ingredient for hardening acceleration is sealed in the hardening accelerator a, so that its concentration is maintained constant.

[0047] The press working oil application section 130 includes an application roller 131 and an oil pan 132 . The oil pan 132 is disposed below the strip steel sheet M and directly below the application roller 131. The application roller 131 has an upper roller 131a and a lower roller 131b. The upper roller 131a is disposed directly above the strip steel sheet M, and by moving up and down, can be switched between a state in contact with and a state separated from the upper surface of the strip steel sheet M. The upper roller 131a can supply press processing oil to the upper surface of the strip steel sheet M by rolling while being in contact with the upper surface of the steel sheet M with press processing oil supplied from a press processing oil supply unit (not shown) permeating its outer circumferential surface. The lower roller 131b is disposed directly below the strip steel sheet M, and can be switched between a state in contact with and a state separated from the lower surface of the strip steel sheet M by moving up and down. The lower roller 131b can supply press processing oil to the underside of the strip steel sheet M by rolling while being in contact with the underside of the steel sheet M with the press processing oil supplied from the press processing oil supply unit permeating its outer circumferential surface. The oil pan 132 receives and collects excess press oil dripping from the upper roller 131a and the lower roller 131b, and returns it to the press oil supply section.

[0048] According to the press processing oil application section 130, by supplying press processing oil from the press processing oil supply section while the upper roller 131a is in contact with the upper surface of the strip steel plate M, a layer of press processing oil can be formed over the entire surface of the insulating coating on the upper surface of the strip steel plate M, while the strip steel plate M can be sent out downstream continuously or intermittently. Similarly, by supplying press processing oil from the press processing oil supply section while the lower roller 131b is in contact with the underside of the strip steel plate M, a layer of press processing oil can be formed over the entire surface of the insulating coating on the underside of the strip steel plate M, while the strip steel plate M is sent downstream continuously or intermittently.

[0049] Alternatively, by sandwiching the strip steel plate M between the upper roller 131a and the lower roller 131b, a layer of press processing oil can be formed over the entire surface of both the insulating coating on the upper surface of the strip steel plate M and the insulating coating on the lower surface of the strip steel plate M, while the strip steel plate M is sent downstream continuously or intermittently. In this way, by moving the positions of the upper roller 131a and the lower roller 131b up and down as needed, the press processing oil can be applied in three ways: only to the upper surface of the strip steel plate M, only to the lower surface of the strip steel plate M, or to both the upper and lower surfaces of the strip steel plate M.

[0050] In any of the above cases, the hardening accelerator on the upper and lower surfaces of the strip steel sheet M before the press oil is applied is viscous and does not easily mix with the press oil, so the application of the press oil prevents the concentration of the hardening accelerator from being diluted. Therefore, the concentration of the hardening accelerator on the upper surface of the strip steel sheet M after the press oil is applied is maintained without change before and after the application of the press oil b. Similarly, the concentration of the hardening accelerator on the lower surface of the strip steel sheet M after the press oil is applied is also maintained without change before and after the application of the press oil b. Therefore, the strip steel sheet M after passing through the press oil application section 130 is sent to the press processing section 140 while maintaining the concentration of the hardening accelerator on its upper and lower surfaces.

[0051] The press processing section 140 includes a first stage punching section 141 and a second stage punching section 142 . The first-stage punching section 141 is disposed downstream of the press oil application section 130 and has a male die 141a and a female die 141b. The male die 141a and the female die 141b are disposed coaxially along the vertical direction, and the strip steel sheet M is inserted between them. Thus, the male die 141a faces the upper surface of the strip steel sheet M, and the female die 141b faces the lower surface of the strip steel sheet M. Then, in a state where the delivery of the strip steel sheet M is temporarily stopped, the male die 141a is moved downward by a hydraulic mechanism (not shown) to reach the female die 141b, thereby performing the first punching process required to form the electromagnetic steel sheet 40 of the strip steel sheet M. At this time, since the press oil is applied to at least one of the upper and lower surfaces of the strip steel sheet M, it is possible to punch without causing seizure or the like. After this punching process, the male die 141a is then moved upward and pulled out from the female die 141b, and the strip steel sheet M is again sent out toward the downstream side.

[0052] The second-stage punching section 142 is disposed downstream of the first-stage punching section 141 and has a male die 142a and a female die 142b. The male die 142a and the female die 142b are disposed coaxially along the vertical direction, and the strip steel sheet M after the first punching process is inserted between them. Thus, the male die 142a faces the upper surface of the strip steel sheet M, and the female die 142b faces the lower surface of the strip steel sheet M. Then, in a state where the delivery of the strip steel sheet M is again temporarily stopped, the male die 142a is moved downward by a hydraulic mechanism (not shown) to reach the female die 142b, thereby performing the second punching process required to form the electromagnetic steel sheet 40 of the strip steel sheet M. At this time, since press processing oil is applied to at least one of the upper and lower surfaces of the strip steel sheet M, it is possible to punch without causing seizure or the like. After this punching process, the male die 142a is then moved upward and pulled out from the female die 142b, and the strip steel sheet M is again sent out toward the downstream side.

[0053] The adhesive application section 150 is disposed downstream of the press processing section 140. The adhesive application section 150 includes an air compressor 151, a syringe 152, a nozzle 153, and a steel plate holder 154. Syringe 152 is a container for storing adhesive, and is connected via piping between air compressor 151 and nozzle 153. Among the adhesives, an example of an anaerobic adhesive is "Arontight" (registered trademark) manufactured by Toagosei Co., Ltd., and an example of a 2-cyanoacrylate adhesive is "Aron Alpha" (registered trademark) manufactured by Toagosei Co., Ltd. The nozzle 153 includes a plurality of needles whose discharge ports face upward. Each needle is disposed below the steel strip M. Therefore, the discharge port of each needle faces the lower surface of the steel strip M.

[0054] The steel plate holder 154 is disposed above the nozzle 153 (directly above each needle). Thus, the steel plate holder 154 faces the upper surface of the strip steel plate M. The steel plate holder 154 is pressed downward by a hydraulic mechanism (not shown) when the delivery of the strip steel plate M is temporarily stopped. As a result, the lower surface of the steel plate holder 154 comes into contact with the upper surface of the strip steel plate M and presses the strip steel plate M downward. This allows the height position of the strip steel plate M to be pressed down to the adhesive application position by the nozzle 153 and positioned. In this positioned state, the lower surface of the strip steel plate M is close to the discharge port of each needle.

[0055] Furthermore, in this positioned state, when the air compressor 151 is started to pump an appropriate amount of air into the syringe 152, the adhesive in the syringe 152 is sent to the nozzle 153. As a result, an appropriate amount of adhesive is discharged from each needle and applied to the underside of the strip steel plate M. Thereafter, the hydraulic mechanism raises the steel plate holder 154, thereby returning the height position of the strip steel plate M to its original height.

[0056] The lamination bonding section 160 is disposed downstream of the adhesive application section 150. The lamination bonding section 160 includes a male outer periphery punching die 161, a female outer periphery punching die 162, a spring 163, and a heater 164. The outer periphery punching male die 161 is a cylindrical die with a circular bottom surface, and the upper end of the die is connected to the lower end of the spring 163. The outer periphery punching male die 161 is supported by the spring 163 and can move up and down together with the spring 163. The outer periphery punching male die 161 has an outer diameter substantially the same as that of the stator adhesive laminated core 21.

[0057] The outer periphery punching female die 162 is a die having a cylindrical internal space, and has an inner diameter dimension that is approximately the same as the outer diameter dimension of the stator bonded laminated core 21 . The heater 164 is integrally built into the outer periphery punching female die 162. The heater 164 heats the periphery of each of the electromagnetic steel sheets (steel sheet components) 40 stacked inside the outer periphery punching female die 162. When a heat-curing type adhesive is used as the adhesive, the adhesive cures when it receives heat from the heater 164. On the other hand, when a room temperature curing type adhesive is used as the adhesive, the adhesive cures at room temperature without the need for heating.

[0058] According to the laminated adhesive section 160, while the feeding of the strip-shaped steel sheet M is temporarily stopped, the outer periphery punching male die 161 is lowered to sandwich the strip-shaped steel sheet M between it and the outer periphery punching female die 162, and the outer periphery punching male die 161 is further pushed into the outer periphery punching female die 162, thereby obtaining an electromagnetic steel sheet 40 whose periphery has been punched out from the strip-shaped steel sheet M. This punched out electromagnetic steel sheet 40 is stacked on the top surface of other electromagnetic steel sheets 40 that have been previously punched out and stacked and bonded inside the outer periphery punching female die 162, and is further subjected to a pressure from the outer periphery punching male die 161 and heat from a heater 164. At this time, the pressure applied to the electromagnetic steel sheet 40 from the outer periphery punching male die 161 is always kept constant by the biasing force of the spring 163. As a result, the currently punched electromagnetic steel sheet 40 is adhered and fixed to the upper surface of the previously punched electromagnetic steel sheet 40. By repeating these steps of outer periphery punching, pressurizing, and heating a number of times corresponding to the number of laminated electromagnetic steel sheets 40, an adhesive laminated core 21 for a stator is formed in the outer periphery punching female die 162.

[0059] 3, the female die 141b, the female die 142b, the nozzle 153, the outer periphery punching female die 162, and the heater 164 are fixed on a common fixed base 171. Therefore, the relative positions of the female die 141b, the female die 142b, the nozzle 153, the outer periphery punching female die 162, and the heater 164 are fixed in the horizontal and vertical directions. Similarly, the male die 141a, the male die 142a, the steel plate holder 154, and the outer periphery punching male die 161 are also fixed to the lower surface of a common movable base 172. Therefore, the relative positions of the male die 141a, the male die 142a, the steel plate holder 154, and the outer periphery punching male die 161 in the horizontal and vertical directions are fixed.

[0060] The drive unit sends out the strip steel sheet M downstream and, when it is temporarily stopped, lowers the movable base 172, thereby simultaneously punching out the outer periphery of the electromagnetic steel sheet 40, stacking and bonding, applying adhesive to the position of the electromagnetic steel sheet 40 where the outer periphery will next be punched in the strip steel sheet M, the second punching process at the position of the strip steel sheet M where the adhesive will next be applied, and the first punching process at the position of the strip steel sheet M where the second punching process will next be performed. Next, the movable base 172 is raised and retracted above the strip steel sheet M, and then the drive unit sends out the strip steel sheet M a predetermined distance downstream again and pauses again. In this state, the movable base 172 is lowered again and processing is continued at each position. In this way, the process of moving the movable base 172 up and down during pauses while intermittently sending the strip steel sheet M by the drive unit is repeated, thereby manufacturing the stator adhesive laminated core 21.

[0061] [Adhesive laminated core manufacturing equipment 200] As shown in FIG. 4, the bonded laminated core manufacturing apparatus 200 of this embodiment includes a strip steel plate supply section 210, a hardening accelerator application section 220, a drive section (not shown), a press processing oil application section 230, a press processing section 240, an adhesive application section 250, and a laminated bonding section 260.

[0062] The strip steel sheet supplying section 210 supports a hoop material F wound with a strip steel sheet M, which is the raw material for the electromagnetic steel sheet (steel sheet component) 40, and sends out the strip steel sheet M toward the right side of the paper in Fig. 4. In the following description, the right side of the paper, which is the feeding direction of the strip steel sheet M, may be referred to as the downstream side, and the left side of the paper, which is the opposite direction, may be referred to as the upstream side. The strip steel sheet M sent downstream from the strip steel sheet supplying section 210 is a steel sheet having the above-mentioned chemical composition, and both sides of the steel sheet are coated with the above-mentioned insulating coating.

[0063] The hardening accelerator application section 220 includes a tank 221 , a switching valve 222 , an upper surface application line 223 and an upper nozzle 224 , and a lower surface application line 225 and a lower nozzle 226 . In the tank 221, a hardening accelerator a is stored. The hardening accelerator a is the same as that explained in the description of the bonded laminated core manufacturing apparatus 100, and therefore the explanation thereof will be omitted here.

[0064] As shown in Fig. 4, the upper nozzle 224 is disposed facing vertically downward so that its discharge port faces the upper surface of the strip steel sheet M. The upper nozzle 224 has multiple discharge ports, and can apply the hardening accelerator a in dots to the upper surface of the strip steel sheet M over its entire width direction. An upper surface coating line 223 is connected to the upper nozzle 224. The upper surface coating line 223 is connected to the tank 221 via a switching valve 222. The lower nozzle 226 is disposed facing vertically upward so that its discharge outlet faces the underside of the strip steel sheet M. The lower nozzle 226 has multiple discharge outlets, and can apply the hardening accelerator a in dots to the underside of the strip steel sheet M over its entire width direction. A lower surface coating line 225 is connected to the lower nozzle 226. The lower surface coating line 225 is connected to the tank 221 via a switching valve 222. The discharge outlet of the lower nozzle 226 faces the discharge outlet of the upper nozzle 224 with the strip steel sheet M sandwiched therebetween.

[0065] The switching valve 222 can switch the supply destination of the hardening accelerator a in the tank 221 to either the upper surface coating line 223 or the lower surface coating line 225 by being switched. When the hardening accelerator a is supplied to the upper surface coating line 223 side via the switching valve 222, the hardening accelerator a is applied in a large number of dots from the upper nozzle 224 only to the upper surface of the strip steel sheet M. On the other hand, when the hardening accelerator a is supplied to the lower surface coating line 225 side via the switching valve 222, the hardening accelerator a is applied in a large number of dots from the lower nozzle 226 only to the lower surface of the strip steel sheet M.

[0066] The drive unit is disposed at a position D between the hardening accelerator application unit 220 and the press working oil application unit 230. The drive unit intermittently sends out the strip steel sheet M from the hardening accelerator application unit 220 toward the press working oil application unit 230 toward the right side of the drawing. Note that the hardening accelerator a has been applied to only one of the upper and lower surfaces of the strip steel sheet M sent out from the hardening accelerator application unit 220 before entering the drive unit. When the hardening accelerator a is applied to the upper surface of the strip steel sheet M, it is not applied to the lower surface. On the other hand, when the hardening accelerator a is applied to the lower surface of the strip steel sheet M, it is not applied to the upper surface. In any of these cases, the hardening accelerator is viscous and does not mix with the press oil, so its concentration is maintained constant.

[0067] The press working oil application section 230 includes an application roller 231 and an oil pan 232 . The oil pan 232 is disposed below the strip steel sheet M and directly below the application roller 231. The application roller 231 has an upper roller 231a and a lower roller 231b. The upper roller 231a is disposed directly above the strip steel sheet M, and by moving up and down, can be switched between a state in contact with and a state separated from the upper surface of the strip steel sheet M. The upper roller 231a can supply press processing oil to the upper surface of the strip steel sheet M by rolling while in contact with the upper surface of the steel sheet M with press processing oil supplied from a press processing oil supply unit (not shown) permeating its outer circumferential surface. The lower roller 231b is disposed directly below the strip steel sheet M, and can be switched between a state in contact with and a state separated from the lower surface of the strip steel sheet M by moving up and down. The lower roller 231b can supply press processing oil to the lower surface of the strip steel sheet M by rolling while being in contact with the lower surface of the steel sheet M in a state in which the press processing oil supplied from the press processing oil supply unit has permeated its outer circumferential surface. The oil pan 232 receives and collects excess press oil dripping from the upper roller 231a and the lower roller 231b, and returns it to the press oil supply section.

[0068] According to the press processing oil application section 230, by supplying press processing oil from the press processing oil supply section while the upper roller 231a is in contact with the upper surface of the strip steel plate M, a layer of press processing oil can be formed over the entire surface of the insulating coating on the upper surface of the strip steel plate M, while the strip steel plate M can be continuously or intermittently sent downstream. Similarly, by supplying press processing oil from the press processing oil supply section while the lower roller 231b is in contact with the underside of the strip steel plate M, a layer of press processing oil can be formed over the entire surface of the insulating coating on the underside of the strip steel plate M, while the strip steel plate M is sent downstream continuously or intermittently.

[0069] Alternatively, by sandwiching the strip steel plate M between the upper roller 231a and the lower roller 231b, a layer of press processing oil can be formed over the entire surface of both the insulating coating on the upper surface of the strip steel plate M and the insulating coating on the lower surface of the strip steel plate M, while the strip steel plate M is sent downstream continuously or intermittently. In this way, by moving the positions of the upper roller 231a and the lower roller 231b up and down as needed, the press processing oil can be applied in three ways: only to the upper surface of the strip steel plate M, only to the lower surface of the strip steel plate M, or to both the upper and lower surfaces of the strip steel plate M.

[0070] In any of the above cases, the hardening accelerator on the upper and lower surfaces of the strip steel sheet M before the press oil is applied is viscous and does not mix with the press oil, so that the application of the press oil prevents the concentration of the hardening accelerator from being diluted. Therefore, the concentration of the hardening accelerator on the upper surface of the strip steel sheet M after the press oil b is applied is maintained without change before and after the application of the press oil b. Similarly, the concentration of the hardening accelerator on the lower surface of the strip steel sheet M after the press oil is applied is maintained without change before and after the application of the press oil b. Therefore, the strip steel sheet M after passing through the press oil application section 230 is sent to the press processing section 240 while maintaining the concentration of the hardening accelerator on its upper and lower surfaces.

[0071] The press processing section 240 includes a first stage punching section 241 , a second stage punching section 242 , and a third stage punching section 243 . The first-stage punching section 241 is disposed downstream of the press oil application section 230 and has a male die 241a and a female die 241b. The male die 241a and the female die 241b are disposed coaxially along the vertical direction, and the strip steel sheet M is inserted between them. Thus, the male die 241a faces the upper surface of the strip steel sheet M, and the female die 241b faces the lower surface of the strip steel sheet M. Then, in a state where the delivery of the strip steel sheet M is temporarily stopped, the male die 241a is moved downward by a hydraulic mechanism (not shown) to reach the female die 241b, thereby performing the first punching process required to form the electromagnetic steel sheet 40 of the strip steel sheet M. At this time, since the press oil is applied to at least one of the upper and lower surfaces of the strip steel sheet M, it is possible to punch without causing seizure or the like. After this punching process, the male die 241a is then moved upward and pulled out from the female die 241b, and the strip steel sheet M is again sent out toward the downstream side.

[0072] The second-stage punching section 242 is disposed downstream of the first-stage punching section 241 and has a male die 242a and a female die 242b. The male die 242a and the female die 242b are disposed coaxially along the vertical direction, and the strip steel sheet M after the first punching process is inserted between them. Thus, the male die 242a faces the upper surface of the strip steel sheet M, and the female die 242b faces the lower surface of the strip steel sheet M. Then, in a state where the delivery of the strip steel sheet M is again temporarily stopped, the male die 242a is moved downward by a hydraulic mechanism (not shown) to reach the female die 242b, thereby performing the second punching process required to form the electromagnetic steel sheet 40 of the strip steel sheet M. At this time, since press processing oil is applied to at least one of the upper and lower surfaces of the strip steel sheet M, it is possible to punch without causing seizure or the like. After this punching process, the male die 242a is then moved upward and pulled out from the female die 242b, and the strip steel sheet M is again sent out toward the downstream side.

[0073] The third-stage punching section 243 is disposed downstream of the second-stage punching section 242 and has a male die 243a and a female die 243b. The male die 243a and the female die 243b are disposed coaxially along the vertical direction, and the strip steel sheet M after the second punching process is inserted between them. Thus, the male die 243a faces the upper surface of the strip steel sheet M, and the female die 243b faces the lower surface of the strip steel sheet M. Then, in a state where the delivery of the strip steel sheet M is again temporarily stopped, the male die 243a is moved downward by a hydraulic mechanism (not shown) to reach the female die 243b, thereby performing the third punching process required to form the electromagnetic steel sheet 40 of the strip steel sheet M. At this time, since press processing oil is applied to at least one of the upper and lower surfaces of the strip steel sheet M, it is possible to punch without causing seizure or the like. After this punching process, the male die 243a is then moved upward and pulled out from the female die 243b, and the strip steel sheet M is again sent out toward the downstream side.

[0074] The adhesive applying section 250 is incorporated in the lamination bonding section 260 located downstream of the press processing section 240. The adhesive applying section 250 includes an air compressor 251, a syringe 252, and a nozzle 253. The syringe 252 is a container for storing an adhesive, and is connected via a pipe between the air compressor 251 and the nozzle 253. The adhesive may be the same as that described in the description of the bonded laminated core manufacturing apparatus 100. The nozzle 253 is disposed above the strip steel sheet M. Therefore, the discharge port of the nozzle 253 faces the upper surface of the strip steel sheet M.

[0075] The lamination bonding section 260 is disposed downstream of the press processing section 240 and at the same position as the adhesive application section 250. The lamination bonding section 260 includes a male outer periphery punching die 261, a female outer periphery punching die 262, a spring 263, and a heater 264. The outer periphery punching male die 261 is a cylindrical die having a circular bottom surface, and the lower end of the spring 263 is connected to the upper end thereof. The outer periphery punching male die 261 is supported by the spring 263 and is movable up and down together with the spring 263. The outer periphery punching male die 261 has an outer diameter dimension that is approximately the same as that of the stator adhesive laminated core 21. The nozzle 253 is built in the outer periphery punching male die 261. The discharge port of the nozzle 253 is formed on the bottom surface of the outer periphery punching male die 261.

[0076] The outer periphery punching female die 262 is a die having a cylindrical internal space, and has an inner diameter dimension that is approximately the same as the outer diameter dimension of the stator bonded laminated core 21 . The heater 264 is integrally built into the outer periphery punching female die 262. The heater 264 heats the periphery of each of the electromagnetic steel sheets (steel sheet components) 40 stacked in the outer periphery punching female die 262. When a heat-curing type adhesive is used as the adhesive, the adhesive cures when it receives heat from the heater 264. On the other hand, when a room temperature curing type adhesive is used as the adhesive, the adhesive cures at room temperature without the need for heating.

[0077] According to the laminated adhesive section 260, while the feeding of the strip-shaped steel sheet M is temporarily stopped, the outer periphery punching male die 261 is lowered to sandwich the strip-shaped steel sheet M between it and the outer periphery punching female die 262, and the outer periphery punching male die 261 is further pushed into the outer periphery punching female die 262, thereby obtaining an electromagnetic steel sheet 40 whose periphery has been punched out from the strip-shaped steel sheet M. Furthermore, during this outer periphery punching, the air compressor 251 is started to pump an appropriate amount of air into the syringe 252, and the adhesive in the syringe 252 is sent to the nozzle 253. As a result, an appropriate amount of adhesive is discharged from the discharge port formed in the bottom surface of the outer periphery punching male die 261, and applied to the upper surface of the strip-shaped steel sheet M. The adhesive applied here is used to bond other electromagnetic steel sheets 40 that will be subsequently outer periphery punched and stacked.

[0078] The electromagnetic steel sheet 40 currently punched out is stacked on the top surface of the other electromagnetic steel sheet 40 that was previously punched and stacked and bonded in the female peripheral punching die 262. This stacking causes the adhesive previously formed on the top surface of the other electromagnetic steel sheet 40 to mix with the hardening accelerator a applied to the top surface of the other electromagnetic steel sheet 40, or with the hardening accelerator a applied to the bottom surface of the electromagnetic steel sheet 40 currently punched out. Furthermore, a pressure from the male peripheral punching die 261 and heat from a heater 264 are applied to each of the stacked electromagnetic steel sheets 40. At this time, the pressure applied to the electromagnetic steel sheet 40 from the male peripheral punching die 261 is always kept constant by the biasing force of the spring 263.

[0079] As a result, the currently punched electromagnetic steel sheet 40 is adhered and fixed to the upper surface of the previously punched electromagnetic steel sheet 40. Meanwhile, the adhesive applied to the upper surface of the currently punched electromagnetic steel sheet 40 has not yet been mixed with the curing accelerator at this point, and therefore has not hardened and remains in a liquid state. By repeating the above-described steps of outer periphery punching, pressurizing, and heating a number of times equal to the number of laminated electromagnetic steel sheets 40, an adhesive laminated core 21 for a stator is formed in the outer periphery punching female die 262.

[0080] 4, the female die 241b, the female die 242b, the female die 243b, the outer periphery punching female die 262, and the heater 264 are fixed on a common fixed base 271. Therefore, the relative positions of the female die 241b, the female die 242b, the female die 243b, the outer periphery punching female die 262, and the heater 264 are fixed in the horizontal and vertical directions. Similarly, the male die 241a, the male die 242a, the male die 243a, the nozzle 253, and the outer periphery punching male die 261 are also fixed to the lower surface of a common movable base 272. Therefore, the relative positions of these male die 241a, the male die 242a, the male die 243a, the nozzle 253, and the outer periphery punching male die 261 are also fixed in the horizontal and vertical directions.

[0081] The drive unit sends out the strip steel plate M downstream and, when it is temporarily stopped, lowers the movable base 272, thereby simultaneously performing the following: outer periphery punching, stacking and bonding of the electromagnetic steel plate 40 and application of adhesive for the next process; the third punching process at the position on the strip steel plate M where the next outer periphery punching will be performed; the second punching process at the position on the strip steel plate M where the next third punching process will be performed; and the first punching process at the position on the strip steel plate M where the next second punching process will be performed. Next, the movable base 272 is raised and retracted above the strip steel sheet M, and then the drive unit sends out the strip steel sheet M a predetermined distance downstream again and pauses again. In this state, the movable base 272 is lowered again and processing is continued at each position. In this way, the process of moving the movable base 272 up and down during pauses while intermittently sending the strip steel sheet M by the drive unit is repeated, thereby manufacturing the stator adhesive laminated core 21.

[0082] [First embodiment] A first embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 5. In this embodiment, the bonded laminated core manufacturing apparatus 100 described with reference to Fig. 3 is used. As shown in FIG. 5, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process S1, a hardening accelerator application process S2, a processing oil application process S3, a first punching process S4, a second punching process S5, an adhesive application process S6, a stacking and bonding process S7, a stack number confirmation process S8, and a removal process S9.

[0083] In the steel plate delivery step S1, a steel plate strip M is delivered from the hoop material F of the steel plate strip supply unit 110 toward the downstream side. In the subsequent hardening accelerator application process S2, the hardening accelerator a in the tank 121 is flowed into the upper surface application line 123 by switching the valve 122. Then, the hardening accelerator a is applied in the form of numerous dots from the upper nozzle 124 onto the entire upper surface of the strip steel plate M. The hardening accelerator a at this time is applied in the form of dots onto the insulating coating formed on the upper surface of the strip steel plate M, and has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied over the entire upper surface of the strip steel plate M.

[0084] In the subsequent processing oil application step S3, the upper roller 131a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil is applied to the entire surface of only the upper surface of the strip-shaped steel sheet M. In other words, the press processing oil b is applied so as to cover both the upper surface of the hardening accelerator a and the upper surface of the insulating coating exposed between each hardening accelerator a. At this time, the hardening accelerator a has a viscosity of 0.01 Pa s or more, so that the hardening accelerator a is prevented from mixing with the press processing oil b and reducing its concentration. On the other hand, the lower roller 131b has been lowered and separated from the lower surface of the strip steel sheet M, so that the press working oil b is not applied to the lower surface of the strip steel sheet M, and the insulating coating remains exposed.

[0085] In the subsequent first punching process S4, the first punching of the strip steel sheet M is performed by the first-stage punching unit 141. At this time, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 141a and the female die 141b do not occur. In the subsequent second punching process S5, the second punching of the strip steel sheet M is performed by the second-stage punching section 142. At this time as well, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 142a and the female die 142b do not occur. By the above-mentioned first punching process S4 and second punching process S5, except for the outer portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed.

[0086] In the subsequent adhesive application process S6, adhesive c discharged from a nozzle 153 is applied to the lower surface of the strip-shaped steel plate M. At this time, adhesive c is applied in the form of a plurality of dots having a predetermined thickness and a predetermined diameter. Since adhesive c has not yet been mixed with a hardening accelerator, it is in a liquid state. In the subsequent lamination and bonding process S7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 161, is laminated on the top surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, hardening accelerator a coated with press processing oil b is arranged in a plurality of dots on the top surface of the other electromagnetic steel sheet 40. The electromagnetic steel sheet 40 that has been punched out this time is laminated on top of this and heated while being pressurized. Then, the adhesive c on the bottom surface of the electromagnetic steel sheet 40 that has been punched out this time pushes aside the press processing oil b on the top surface side of the other electromagnetic steel sheet 40 that has been punched out previously, and mixes with the plurality of hardening accelerators a arranged in a dot shape underneath. As a result, the adhesive c instantly hardens and bonds the two electromagnetic steel sheets 40 together.

[0087] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step S8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. As a result, if it has not reached that number (determination: NO), the flow returns to the steel sheet delivery step S1, and the steel sheet delivery step S1 to the stacking and bonding step S7 are repeated again. On the other hand, if the predetermined number has been reached in the stacking number confirmation step S8 (determination: YES), the flow proceeds to the removal step S9. In the subsequent removal step S9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0088] The gist of the present embodiment described above will be summarized below. (1) The method for manufacturing a bonded laminated core of this embodiment is a method for manufacturing a stator bonded laminated core 21 by pressing a strip-shaped steel sheet M with press processing oil b applied to one side thereof, applying an adhesive c to one side of the strip-shaped steel sheet M to obtain a plurality of electromagnetic steel sheets 40, and stacking and bonding the electromagnetic steel sheets 40 together. Then, a hardening accelerator a with an average viscosity of 0.01 Pa s to 100 Pa s is applied to one side of the strip-shaped steel sheet M before the application of the press processing oil b (the upper surface of the electromagnetic steel sheet 40 whose outer periphery has been punched out in the previous step). According to the adhesive laminated core manufacturing method described in (1) above, since the average viscosity of the hardening accelerator a is set to 0.01 Pa·s or more, it is possible to maintain a state in which mixing with the press processing oil b is suppressed. Therefore, the concentration of the hardening accelerator before stacking and bonding each electromagnetic steel sheet 40 can be maintained high. In addition, since the average viscosity of the hardening accelerator a is suppressed to 100 Pa·s or less, it is possible to suppress the viscosity of the hardening accelerator a from preventing mixing with the adhesive c when stacking and bonding each electromagnetic steel sheet 40. In this way, when stacking and bonding each electromagnetic steel sheet 40, the hardening accelerator can be reliably mixed with the adhesive c while maintaining a high concentration, so that high adhesive strength can be developed early. Therefore, it is possible to obtain higher productivity while ensuring sufficient adhesive strength.

[0089] (2) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched previously and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched currently. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has been previously punched out, and which has an upper surface (first surface), a hardening accelerator a arranged on the upper surface, and a press processing oil b arranged on the hardening accelerator a; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has a lower surface (second surface) and an adhesive c arranged on the lower surface; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (first surface) and the lower surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (2) above, in the first step, the hardening accelerator a has a high viscosity, so that a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, the hardening accelerator a can be bonded to each other while maintaining its original high concentration.

[0090] [Second embodiment] A second embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 6. In this embodiment, the bonded laminated core manufacturing apparatus 200 described with reference to Fig. 4 is used. As shown in Figure 6, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SA1, a hardening accelerator application process SA2, a processing oil application process SA3, a first punching process SA4, a second punching process SA5, a third punching process SA6, a stacking and bonding process SA7, a laminate number confirmation process SA8, and a removal process SA9.

[0091] In the steel plate delivery process SA1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SA2, the hardening accelerator a in the tank 221 is caused to flow into the upper surface application line 223 by switching the valve 222. Then, the hardening accelerator a is applied in the form of numerous dots from the upper nozzle 224 onto the entire upper surface of the strip steel plate M. The hardening accelerator a at this time has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied onto the entire upper surface of the strip steel plate M.

[0092] In the subsequent processing oil application step SA3, the upper roller 231a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of only the upper surface of the strip-shaped steel sheet M. That is, the press processing oil b is applied so as to cover both the upper surface of the hardening accelerator a and the upper surface of the insulating coating exposed between the hardening accelerators a. At this time, since the hardening accelerator a has a viscosity of 0.01 Pa·s or more, the hardening accelerator a itself does not dissolve in the press processing oil b and maintains a state of being retained on the steel sheet surface. Therefore, the hardening accelerator a is prevented from mixing with the press processing oil b and decreasing in concentration. On the other hand, the lower roller 231b has been lowered and separated from the lower surface of the strip steel sheet M, so that the press processing oil b is not applied to the lower surface of the strip steel sheet M, and the insulating coating remains exposed.

[0093] In the subsequent first punching process SA4, the first punching of the strip steel sheet M is performed by the first-stage punching section 241. At this time, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 241a and the female die 241b do not occur. In the subsequent second punching process SA5, the second punching of the strip steel sheet M is performed by the second-stage punching section 242. At this time as well, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 242a and the female die 242b do not occur. In the subsequent third punching process SA6, the third punching of the strip steel sheet M is performed by the third-stage punching section 243. At this time as well, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 243a and the female die 243b do not occur. Through the above-mentioned first punching process SA4 to third punching process SA6, except for the outer shape portion, the core back portion 22 and the teeth portion 23 shown in FIG. 1 are formed in the strip-shaped steel sheet M. In addition, the hardening accelerator a maintains its viscosity at 0.01 Pa·s or more and is soluble in the press processing oil b. It is inhibited from being released.

[0094] In the subsequent lamination and bonding process SA7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 261, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, on the upper surface of the other electromagnetic steel sheet 40, a plurality of dot-like hardening accelerators a, press processing oil b covering the hardening accelerators a and the spaces between the hardening accelerators a, and dot-like adhesive c applied on the press processing oil b at the time of the previous outer periphery punching are arranged. The electromagnetic steel sheet 40 that has been punched out this time is heated in a state in which it is stacked and pressed on the other electromagnetic steel sheet 40 that has been punched out the periphery previously. Then, the adhesive c on the upper surface of the other electromagnetic steel sheet 40 that has been punched out the periphery previously pushes aside the press processing oil b on its lower surface and mixes with the plurality of dot-like hardening accelerators a below it. Then, the hardening accelerator a mixes with the adhesive c while maintaining its concentration. As a result, the adhesive c instantly hardens and bonds both electromagnetic steel sheets 40 together. Meanwhile, while the electromagnetic steel sheet 40 that has been peripherally punched this time is being laminated onto the other electromagnetic steel sheets 40, adhesive c is applied from a nozzle 253 to the top surface of the electromagnetic steel sheet 40 that has been peripherally punched this time. This adhesive c is in a liquid state since it is on the top surface of the electromagnetic steel sheet 40 and has not yet been mixed with the hardening accelerator.

[0095] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SA8, it is judged whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. If the number has not reached the predetermined number (judgment: NO), the flow returns to the steel sheet delivery step SA1, and the steel sheet delivery step SA1 to the stacking and bonding step SA7 are repeated again. On the other hand, if the number has reached the predetermined number in the stacking number confirmation step SA8 (judgment: YES), the flow proceeds to the removal step SA9. In the subsequent removal step SA9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 262, thereby completing all steps of the bonded laminated core manufacturing method.

[0096] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1) described in the first embodiment. In addition, this embodiment has the following features and effects: (3). (3) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched previously and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched currently. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet part) which has an upper surface (first surface), a hardening accelerator a arranged on the upper surface, a press processing oil b arranged on the hardening accelerator a, and an adhesive c arranged on the press processing oil b and which has been peripherally punched out in a previous step; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet part) which has a lower surface (second surface) and which has been peripherally punched out in a current step; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (first surface) and the lower surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (3) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0097] [Third embodiment] A third embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 7. In this embodiment, the bonded laminated core manufacturing apparatus 100 described with reference to Fig. 3 is used. As shown in Figure 7, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SB1, a hardening accelerator application process SB2, a processing oil application process SB3, a first punching process SB4, a second punching process SB5, an adhesive application process SB6, a stacking and bonding process SB7, a laminate number confirmation process SB8, and a removal process SB9.

[0098] In the steel plate delivery process SB1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SB2, the hardening accelerator a in the tank 121 is flowed into the upper surface application line 123 by switching the valve 122. Then, the hardening accelerator a is applied in the form of numerous dots from the upper nozzle 124 onto the entire upper surface of the strip steel plate M. The hardening accelerator a at this time has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied onto the entire upper surface of the strip steel plate M.

[0099] In the subsequent processing oil application step SB3, the lower roller 131b, with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface, rolls in contact with the lower surface of the steel sheet M. As a result, the press processing oil b is applied to the entire surface of only the lower surface of the strip-shaped steel sheet M. On the other hand, since the upper roller 131a has risen and is separated from the upper surface of the strip steel sheet M, the press working oil b is not applied to the upper surface of the strip steel sheet M, and the insulating coating remains exposed.

[0100] In the subsequent first punching process SB4, the first punching of the strip steel sheet M is performed by the first-stage punching section 141. At this time, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 141a and the female die 141b do not occur. In the subsequent second punching process SB5, the second punching of the strip steel sheet M is performed by the second-stage punching section 142. At this time as well, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 142a and the female die 142b do not occur. By the above-mentioned first punching process SB4 and second punching process SB5, except for the outer portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed.

[0101] In the subsequent adhesive application process SB6, adhesive c discharged from a nozzle 153 is applied onto the press processing oil b on the lower surface of the strip steel plate M. At this time, adhesive c is applied in the form of a plurality of dots having a predetermined thickness and a predetermined diameter. Since adhesive c has not yet been mixed with the hardening accelerator, it is in a liquid state. In the subsequent lamination and bonding process SB7, the electromagnetic steel sheet 40, the periphery of which has been punched out of the strip-shaped steel sheet M by the outer periphery punching male die 161, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the hardening accelerator a is arranged in a plurality of dots on the upper surface of the electromagnetic steel sheet 40 that has been punched out previously. The electromagnetic steel sheet 40 that has been punched out this time is laminated on top of this and heated while being pressurized. Then, the adhesive c on the lower surface of the electromagnetic steel sheet 40 that has been punched out this time mixes with the plurality of hardening accelerators a arranged in a dot shape on the upper surface of the electromagnetic steel sheet 40 that has been punched out previously. Then, the hardening accelerator a mixes with the adhesive c while maintaining its concentration. In addition, the adhesive c is applied directly to the lower surface of the electromagnetic steel sheet 40 that has been punched out this time, pushing aside the press processing oil b, by applying pressure. The adhesive c mixed with the hardening accelerator a in this state instantly hardens and bonds the two electromagnetic steel sheets 40 together.

[0102] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation process SB8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. As a result, if it has not reached that number (determination: NO), the flow returns to the steel sheet delivery process SB1, and the steel sheet delivery process SB1 to the third punching and stacking process SB7 are repeated again. On the other hand, if the predetermined number has been reached in the stacking number confirmation process SB8 (determination: YES), the flow proceeds to the removal process SB9. In the subsequent removal step SB9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0103] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1) described in the first embodiment. In addition, this embodiment has the following features and effects: (4). (4) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched previously and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched currently. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has been peripherally punched previously and has an upper surface (first surface) and a hardening accelerator a arranged on the upper surface; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has been peripherally punched this time and has a lower surface (second surface), press processing oil b arranged on the lower surface, and adhesive c arranged on the press processing oil b; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (first surface) and the lower surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described above in (4), the decrease in concentration of the hardening accelerator a is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0104] [Fourth embodiment] A fourth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 8. In this embodiment, the bonded laminated core manufacturing apparatus 100 described with reference to Fig. 3 is used. As shown in Figure 8, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SC1, a hardening accelerator application process SC2, a processing oil application process SC3, a first punching process SC4, a second punching process SC5, an adhesive application process SC6, a stacking and bonding process SC7, a laminate number confirmation process SC8, and a removal process SC9.

[0105] In the steel plate delivery process SC1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SC2, the hardening accelerator a in the tank 121 is flowed into the upper surface application line 123 by switching the valve 122. Then, the hardening accelerator a is applied in the form of numerous dots from the upper nozzle 124 onto the entire upper surface of the strip steel plate M. The hardening accelerator a at this time has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied onto the entire upper surface of the strip steel plate M.

[0106] In the subsequent processing oil application step SC3, the strip-shaped steel sheet M is sandwiched between the upper roller 131a and the lower roller 131b. Then, the upper roller 131a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. Similarly, the lower roller 131b rolls in contact with the lower surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of both the upper and lower surfaces of the strip-shaped steel sheet M. In this case, the viscosity of the hardening accelerator a is 0.01 Pa·s or more, so it is prevented from mixing with the press processing oil b and reducing its concentration.

[0107] In the subsequent first punching process SC4, the first punching of the strip steel sheet M is performed by the first-stage punching section 141. At this time, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 141a and the female die 141b do not occur. In the subsequent second punching process SC5, the second punching of the strip steel sheet M is performed by the second-stage punching section 142. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 142a and the female die 142b do not occur. By the above-mentioned first punching process SC4 and second punching process SC5, except for the outer portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed.

[0108] In the subsequent adhesive application process SC6, adhesive c discharged from a nozzle 153 is applied onto the press processing oil b on the lower surface of the strip steel plate M. At this time, adhesive c is applied in the form of a plurality of dots having a predetermined thickness and a predetermined diameter. Since adhesive c has not yet been mixed with the hardening accelerator, it is in a liquid state. In the subsequent lamination and bonding step SC7, the electromagnetic steel sheet 40 whose periphery has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 161 is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the upper surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously has a plurality of dot-like hardening accelerators a and press processing oil b that covers both the upper surface of the hardening accelerators a and the upper surface of the insulating coating exposed between the hardening accelerators a. The electromagnetic steel sheet 40 whose periphery has been punched out this time is laminated on top of this and heated while being pressurized. Then, the adhesive c on the lower surface of the electromagnetic steel sheet 40 whose periphery has been punched out this time pushes aside the press processing oil b on the upper surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously and mixes with the hardening accelerator a underneath. Then, the hardening accelerator a mixes with the adhesive c while maintaining its concentration. The adhesive c is also applied directly to the lower surface of the electromagnetic steel sheet 40 whose periphery has been punched out this time by applying pressure, pushing aside the press processing oil b. In this state, the adhesive c mixed with the hardening accelerator a hardens instantly, bonding both electromagnetic steel sheets 40 together.

[0109] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SC8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. If the number has not reached the predetermined number (determination: NO), the flow returns to the steel sheet delivery step SC1, and the steel sheet delivery step SC1 to the stacking and bonding step SC7 are repeated again. On the other hand, if the number has reached the predetermined number in the stacking number confirmation step SC8 (determination: YES), the flow proceeds to the removal step SC9. In the subsequent removal step SC9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0110] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1) described in the first embodiment. In addition, this embodiment has the following features and effects: (5). (5) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched previously and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched currently. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has been peripherally punched out previously, and which has an upper surface (first surface), a hardening accelerator a arranged on the upper surface, and a press processing oil b arranged on the hardening accelerator a; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has been peripherally punched out this time, and which has a lower surface (second surface), a press processing oil b arranged on the lower surface, and an adhesive c arranged on the press processing oil b; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (first surface) and the lower surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (5) above, the concentration of the hardening accelerator a is suppressed from decreasing, so that in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator maintains its original high concentration.

[0111] [Fifth embodiment] A fifth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 9. In this embodiment, the bonded laminated core manufacturing apparatus 200 described with reference to Fig. 4 is used. As shown in Figure 9, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SD1, a hardening accelerator application process SD2, a processing oil application process SD3, a first punching process SD4, a second punching process SD5, a third punching process SD6, a lamination and bonding process SD7, a laminate number confirmation process SD8, and a removal process SD9.

[0112] In the steel plate delivery process SD1, a steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SD2, the hardening accelerator a in the tank 221 is caused to flow into the upper surface application line 223 by switching the valve 222. Then, the hardening accelerator a is applied in the form of numerous dots from the upper nozzle 224 onto the entire upper surface of the strip steel plate M. At this time, the hardening accelerator a is applied in dots onto the insulating coating formed on the upper surface of the strip steel plate M, and the viscosity of the viscous agent is in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in dots is applied to the entire upper surface of the strip steel plate M at equal intervals from one another.

[0113] In the subsequent processing oil application step SD3, the strip-shaped steel sheet M is sandwiched between the upper roller 231a and the lower roller 231b. Then, the upper roller 231a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. Similarly, the lower roller 231b rolls in contact with the lower surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of both the upper and lower surfaces of the strip-shaped steel sheet M. In this case, the viscosity of the hardening accelerator a is 0.01 Pa·s or more, so it is prevented from mixing with the press processing oil b and reducing its concentration.

[0114] In the subsequent first punching process SD4, the first punching of the strip steel sheet M is performed by the first-stage punching section 241. At this time, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 241a and the female die 241b do not occur. In the subsequent second punching process SD5, the second punching of the strip steel sheet M is performed by the second-stage punching section 242. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 242a and the female die 242b do not occur. In the subsequent third punching process SD6, the third punching of the strip steel sheet M is performed by the third-stage punching section 243. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 243a and the female die 243b do not occur. By the above-mentioned first punching process SD4 to third punching process SD6, except for the outer portion, the core-back portion 22 and teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, since the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, it does not dissolve in the press processing oil b, and a decrease in the concentration of the hardening accelerator is suppressed.

[0115] In the subsequent lamination and bonding process SD7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the periphery punching male die 261, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the upper surface of the other electromagnetic steel sheet 40 is provided with a plurality of dot-like hardening accelerators a, press processing oil b covering the hardening accelerators a and the spaces between the hardening accelerators a, and dot-like adhesive c applied on the press processing oil b at the time of the previous periphery punching. The electromagnetic steel sheet 40 that has been punched out this time is heated in a state where it is stacked and pressurized on the other electromagnetic steel sheet 40 that has been punched out this time. Then, the adhesive c on the upper surface of the other electromagnetic steel sheet 40 that has been punched out this time, while maintaining its concentration, pushes aside the press processing oil b on its lower surface and mixes with the plurality of dot-like hardening accelerators a below it. The adhesive c is also applied directly to the lower surface of the electromagnetic steel sheet 40 that has been punched out this time by applying pressure, pushing aside the press processing oil b. In this state, the adhesive c mixed with the hardening accelerator a hardens instantly, bonding both electromagnetic steel sheets 40 together. Meanwhile, while the electromagnetic steel sheet 40 that has been peripherally punched this time is being laminated onto the other electromagnetic steel sheets 40, adhesive c is applied from a nozzle 253 to the top surface of the electromagnetic steel sheet 40 that has been peripherally punched this time. This adhesive c is in a liquid state since it is on the top surface of the electromagnetic steel sheet 40 and has not yet been mixed with the hardening accelerator a.

[0116] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation process SD8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. If the number has not reached the predetermined number (determination: NO), the flow returns to the steel sheet delivery process SD1, and the steel sheet delivery process SD1 to the stacking and bonding process SD7 are repeated again. On the other hand, if the number has reached the predetermined number in the stacking number confirmation process SD8 (determination: YES), the flow proceeds to the removal process SD9. In the subsequent removal step SD9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 262, thereby completing all steps of the bonded laminated core manufacturing method.

[0117] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1) described in the first embodiment. In addition, this embodiment has the following features and effects (6). (6) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched previously and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched currently. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has an upper surface (first surface), a hardening accelerator a arranged on the upper surface, press processing oil b arranged on the hardening accelerator a, and an adhesive c arranged on the press processing oil b, and which has been previously punched out along its outer periphery; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has a lower surface (second surface) and press processing oil b arranged on the lower surface; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (first surface) and the lower surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (6) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0118] [Sixth embodiment] A sixth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 10. In this embodiment, the bonded laminated core manufacturing apparatus 200 described with reference to Fig. 4 is used. As shown in the figure, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SE1, a hardening accelerator application process SE2, a processing oil application process SE3, a first punching process SE4, a second punching process SE5, a third punching process SE6, a lamination and bonding process SE7, a laminate number confirmation process SE8, and a removal process SE9.

[0119] In the steel plate delivery process SE1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 210 toward the downstream side. In the subsequent hardening accelerator application process SE2, the hardening accelerator a in the tank 221 is flowed into the underside application line 225 by switching the valve 222. Then, the hardening accelerator a is applied in the form of numerous dots from the lower nozzle 226 onto the entire underside of the strip steel plate M. The hardening accelerator a at this time is applied in the form of dots onto the insulating coating formed on the underside of the strip steel plate M, and has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied over the entire underside of the strip steel plate M.

[0120] In the subsequent processing oil application step SE3, the lower roller 231b rolls in contact with the lower surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of only the lower surface of the strip-shaped steel sheet M. In other words, the press processing oil b is applied so as to cover both the hardening accelerator a and the insulating coating exposed between the hardening accelerators a. At this time, the hardening accelerator a has a viscosity of 0.01 Pa s or more, so that the hardening accelerator a maintains a state in which the active ingredient for hardening promotion is sealed inside, and the hardening accelerator a is prevented from mixing with the press processing oil b and decreasing in concentration. On the other hand, since the upper roller 231a has risen and is separated from the upper surface of the strip steel sheet M, the press processing oil b is not applied to the upper surface of the strip steel sheet M, and the insulating coating remains exposed.

[0121] In the subsequent first punching process SE4, the first punching of the strip steel sheet M is performed by the first-stage punching section 241. At this time, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 241a and the female die 241b do not occur. In the subsequent second punching process SE5, the second punching of the strip steel sheet M is performed by the second-stage punching section 242. At this time, too, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 242a and the female die 242b do not occur. In the subsequent third punching process SE6, the third punching of the strip steel sheet M is performed by the third-stage punching section 243. At this time, too, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 243a and the female die 243b do not occur. By the above-mentioned first punching process SE4 to third punching process SE6, except for the outer portion, the core-back portion 22 and teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed so that the hardening accelerator a does not dissolve into the press processing oil b.

[0122] In the subsequent lamination and bonding process SE7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 261, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the upper surface of the other electromagnetic steel sheet 40 is provided with adhesive dots c that have been applied during the previous outer periphery punching. The electromagnetic steel sheet 40 that has been punched out this time is heated in a state in which it is laminated and pressed on the other electromagnetic steel sheet 40 that has been punched out this time. Then, the adhesive c on the upper surface of the other electromagnetic steel sheet 40 that has been punched out this time pushes aside the press processing oil b on the lower surface of the electromagnetic steel sheet 40 that has been punched out this time, and mixes with the multiple hardening accelerators a that have been arranged in dots behind it. As a result, the adhesive c instantly hardens to bond the two electromagnetic steel sheets 40 together. Meanwhile, while the electromagnetic steel sheet 40 that has been peripherally punched this time is being laminated onto the other electromagnetic steel sheets 40, adhesive c is applied from a nozzle 253 to the top surface of the electromagnetic steel sheet 40 that has been peripherally punched this time. This adhesive c is in a liquid state since it is on the top surface of the electromagnetic steel sheet 40 and has not yet been mixed with the hardening accelerator.

[0123] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SE8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. If the number has not reached the predetermined number (determination: NO), the flow returns to the steel sheet delivery step SE1, and the steel sheet delivery step SE1 to the stacking and bonding step SE7 are repeated again. On the other hand, if the number has reached the predetermined number in the stacking number confirmation step SE8 (determination: YES), the flow proceeds to the removal step SE9. In the subsequent removal step SE9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0124] The gist of the present embodiment described above will be summarized below. (1A) The method for manufacturing a bonded laminated core of this embodiment is a method for manufacturing a stator bonded laminated core 21 by pressing a strip-shaped steel sheet M with press processing oil b applied to one side thereof, applying an adhesive c to one side of the strip-shaped steel sheet M to obtain a plurality of electromagnetic steel sheets 40, and stacking and bonding the electromagnetic steel sheets 40. Then, a hardening accelerator a having an average viscosity of 0.01 Pa s to 100 Pa s is applied to one side of the strip-shaped steel sheet M before the press processing oil b is applied (the upper surface of the electromagnetic steel sheet 40 whose outer periphery has been punched out this time). According to the method for manufacturing a bonded laminated core described in (1A) above, since the average viscosity of the hardening accelerator a is set to 0.01 Pa·s or more, the active ingredient of hardening acceleration sealed inside can be maintained in a state in which mixing with the press processing oil b is suppressed. Therefore, the concentration of the hardening accelerator a before stacking and bonding each electromagnetic steel sheet 40 can be maintained high. In addition, since the average viscosity of the hardening accelerator a is suppressed to 100 Pa·s or less, it is possible to suppress the viscosity of the hardening accelerator a from preventing the hardening accelerator and the adhesive c from mixing when stacking and bonding each electromagnetic steel sheet 40. In this way, when stacking and bonding each electromagnetic steel sheet 40, the hardening accelerator a can be reliably mixed with the adhesive c while maintaining a high concentration, so that high adhesive strength can be developed early. Therefore, it is possible to obtain higher productivity while ensuring sufficient adhesive strength.

[0125] (2A) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched this time and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched previously. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has been circumferentially punched out this time, the electromagnetic steel sheet 40 having a lower surface (first surface), a hardening accelerator a arranged on the lower surface, and a press processing oil b arranged on the hardening accelerator a; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has been circumferentially punched out the previous time, the electromagnetic steel sheet 40 having an upper surface (second surface) and an adhesive c arranged on the upper surface; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the upper surface (second surface) and the lower surface (first surface) face each other. According to the method for manufacturing a bonded laminated core described in (2A) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration is suppressed by the press processing oil b. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0126] [Seventh embodiment] A seventh embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 11. In this embodiment, the bonded laminated core manufacturing apparatus 100 described with reference to Fig. 3 is used. As shown in Figure 11, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SF1, a hardening accelerator application process SF2, a processing oil application process SF3, a first punching process SF4, a second punching process SF5, an adhesive application process SF6, a stacking and bonding process SF7, a laminate number confirmation process SF8, and a removal process SF9.

[0127] In the steel plate delivery process SF1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SF2, the hardening accelerator a in the tank 121 is flowed into the underside application line 125 by switching the valve 122. Then, the hardening accelerator a is applied in the form of numerous dots from the lower nozzle 126 onto the entire underside of the strip steel plate M. The hardening accelerator a at this time has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied onto the entire underside of the strip steel plate M.

[0128] In the subsequent processing oil application step SF3, the lower roller 131b rolls in contact with the underside of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of only the underside of the strip-shaped steel sheet M. In other words, the press processing oil b is applied so as to cover both the hardening accelerator a and the insulating coating exposed between each hardening accelerator a. At this time, the hardening accelerator a has a viscosity of 0.01 Pa s or more, so that the hardening accelerator is prevented from mixing with the press processing oil b and reducing its concentration. On the other hand, since the upper roller 131a has risen and is separated from the upper surface of the strip steel sheet M, the press working oil b is not applied to the upper surface of the strip steel sheet M, and the insulating coating remains exposed.

[0129] In the subsequent first punching process SF4, the first punching of the strip steel sheet M is performed by the first-stage punching section 141. At this time, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 141a and the female die 141b do not occur. In the subsequent second punching process SF5, the second punching of the strip steel sheet M is performed by the second-stage punching section 142. At this time as well, since the press processing oil b has been applied in advance to the underside of the strip steel sheet M, defects in the press processing such as seizure between the male die 142a and the female die 142b do not occur. By the above-mentioned first punching process SF4 and second punching process SF5, except for the outer portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed.

[0130] In the subsequent adhesive application process SF6, adhesive c discharged from a nozzle 153 is applied onto the press processing oil b on the underside of the strip steel plate M. At this time, adhesive c is applied in the form of a plurality of dots having a predetermined thickness and a predetermined diameter. Since adhesive c has not yet been mixed with hardening accelerator a, it is in a liquid state. In the subsequent lamination and bonding process SF7, the electromagnetic steel sheet 40 whose periphery has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 161 is laminated on the top surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the insulating coating remains exposed on the top surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously. The electromagnetic steel sheet 40 whose periphery has been punched out this time is laminated on top of this and heated while being pressurized. Then, the adhesive c on the bottom surface of the electromagnetic steel sheet 40 whose periphery has been punched out this time is applied to the top surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously. At the same time as this application, the adhesive c pushes aside the press processing oil b of the electromagnetic steel sheet 40 whose periphery has been punched out this time and mixes with the hardening accelerator a on it. Then, the hardening accelerator a mixes with the adhesive c while maintaining its concentration. The adhesive c mixed with the hardening accelerator a in this way instantly hardens and bonds the two electromagnetic steel sheets 40 together.

[0131] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SF8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. As a result, if it has not reached that number (determination: NO), the flow returns to the steel sheet delivery step SF1, and the steel sheet delivery step SF1 to the stacking and bonding step SF7 are repeated again. On the other hand, if the predetermined number has been reached in the stacking number confirmation step SF8 (determination: YES), the flow proceeds to the removal step SF9. In the subsequent removal step SF9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0132] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1A) described in the sixth embodiment. In addition, this embodiment has the following features and effects of (3A). (3A) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched this time and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched previously. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet part) which has a lower surface (first surface), a hardening accelerator a arranged on the lower surface, a press processing oil b arranged on the hardening accelerator a, and an adhesive c arranged on the press processing oil b and which has been peripherally punched out this time; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet part) which has an upper surface (second surface) and which has been peripherally punched out previously; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the lower surface (first surface) and the front upper surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (3A) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0133] [Eighth embodiment] An eighth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 12. In this embodiment, the bonded laminated core manufacturing apparatus 200 described with reference to Fig. 4 is used. As shown in Figure 12, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SG1, a hardening accelerator application process SG2, a processing oil application process SG3, a first punching process SG4, a second punching process SG5, a third punching process SG6, a stacking and bonding process SG7, a laminate number confirmation process SG8, ​​and a removal process SG9.

[0134] In the steel plate delivery process SG1, a steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SG2, the hardening accelerator a in the tank 221 is flowed into the underside application line 225 by switching the valve 222. Then, the hardening accelerator a is applied in the form of numerous dots from the lower nozzle 226 onto the entire underside of the strip steel plate M. The hardening accelerator a at this time has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied onto the entire underside of the strip steel plate M.

[0135] In the subsequent processing oil application step SG3, the upper roller 231a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of only the upper surface of the strip-shaped steel sheet M. At this time, the hardening accelerator a has a viscosity of 0.01 Pa s or more, so that it is prevented from mixing with the press processing oil b and decreasing in concentration. On the other hand, the lower roller 231b has been lowered and separated from the lower surface of the strip steel sheet M, so that the press processing oil b is not applied to the lower surface of the strip steel sheet M, and the insulating coating remains exposed.

[0136] In the subsequent first punching process SG4, the first punching of the strip steel sheet M is performed by the first-stage punching section 241. At this time, since the press processing oil b has been applied to the strip steel sheet M in advance, defects in the press processing such as seizure between the male die 241a and the female die 241b do not occur. In the subsequent second punching process SG5, the second punching of the strip steel sheet M is performed by the second-stage punching section 242. At this time, too, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 242a and the female die 242b do not occur. In the subsequent third punching process SG6, the third punching of the strip steel sheet M is performed by the third-stage punching section 243. At this time, too, since the press processing oil b has been applied in advance to the upper surface of the strip steel sheet M, defects in the press processing such as seizure between the male die 243a and the female die 243b do not occur. By the above-mentioned first punching process SG4 to third punching process SG6, except for the outer shape portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more.

[0137] In the subsequent lamination and bonding process SG7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 261, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, the dot-like adhesive c applied at the time of the previous outer periphery punching is arranged on the upper surface of the other electromagnetic steel sheet 40. The electromagnetic steel sheet 40 that has been punched out this time is heated in a state where it is laminated and pressed on the other electromagnetic steel sheet 40 that has been punched out this time. Then, the adhesive c on the upper surface of the other electromagnetic steel sheet 40 that has been punched out this time pushes aside the press processing oil b on its lower surface and is applied to the upper surface of the other electromagnetic steel sheet 40 that is below it. At the same time, the adhesive c mixes with the multiple hardening accelerators a on the lower surface of the electromagnetic steel sheet 40 that has been punched out this time. Then, the hardening accelerator a mixes with the adhesive c while maintaining its concentration. As a result, the adhesive c instantly hardens and bonds the two electromagnetic steel sheets 40 together. Meanwhile, while the electromagnetic steel sheet 40 that has been peripherally punched this time is being laminated onto the other electromagnetic steel sheets 40, adhesive c is applied from a nozzle 253 to the top surface of the electromagnetic steel sheet 40 that has been peripherally punched this time. This adhesive c is in a liquid state since it is on the top surface of the electromagnetic steel sheet 40 and has not yet been mixed with the hardening accelerator a.

[0138] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in stacking number confirmation step SG8, ​​it is judged whether the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. As a result, if it has not reached that number (judgment: NO), the flow returns to the steel sheet delivery step SG1, and the steel sheet delivery step SG1 to the stacking and bonding step SG7 are repeated again. On the other hand, if the predetermined number has been reached in stacking number confirmation step SG8 (judgment: YES), the flow proceeds to the removal step SG9. In the subsequent removal step SG9, the completed bonded laminated core for a stator 21 is removed from the outer periphery punching female die 262, thereby completing all steps of the bonded laminated core manufacturing method.

[0139] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1A) described in the sixth embodiment. In addition, this embodiment has the following features and effects of (5A). (5A) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched this time and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched previously. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has been circumferentially punched out this time, the electromagnetic steel sheet 40 having a lower surface (first surface) and a hardening accelerator a arranged on the lower surface; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has been circumferentially punched out the previous time, the electromagnetic steel sheet 40 having an upper surface (second surface), press processing oil b arranged on the upper surface, and adhesive c arranged on the press processing oil b; and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the lower surface (first surface) and the upper surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (5A) above, the concentration of the hardening accelerator a is suppressed from decreasing, so that in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration.

[0140] [Ninth embodiment] A ninth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flowchart of Fig. 13. In this embodiment, the bonded laminated core manufacturing apparatus 200 described with reference to Fig. 4 is used. As shown in Figure 13, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SH1, a hardening accelerator application process SH2, a processing oil application process SH3, a first punching process SH4, a second punching process SH5, a third punching process SH6, a lamination and bonding process SH7, a laminate number confirmation process SH8, and a removal process SH9.

[0141] In the steel plate delivery process SH1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 210 toward the downstream side. In the subsequent hardening accelerator application process SH2, the hardening accelerator a in the tank 221 is flowed into the underside application line 225 by switching the valve 222. Then, the hardening accelerator a is applied in the form of numerous dots from the lower nozzle 226 onto the entire underside of the strip steel plate M. The hardening accelerator a at this time is applied in the form of dots onto the insulating coating formed on the underside of the strip steel plate M, and has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied over the entire underside of the strip steel plate M.

[0142] In the subsequent processing oil application step SH3, the strip-shaped steel sheet M is sandwiched between the upper roller 231a and the lower roller 231b. Then, the upper roller 231a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. Similarly, the lower roller 231b rolls in contact with the lower surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of both the upper and lower surfaces of the strip-shaped steel sheet M. In this case, the viscosity of the hardening accelerator a is 0.01 Pa·s or more, so it is prevented from mixing with the press processing oil b and reducing its concentration.

[0143] In the subsequent first punching process SH4, the first punching of the strip steel sheet M is performed by the first-stage punching section 241. At this time, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 241a and the female die 241b do not occur. In the subsequent second punching process SH5, the second punching of the strip steel sheet M is performed by the second-stage punching section 242. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 242a and the female die 242b do not occur. In the subsequent third punching process SH6, the third punching of the strip steel sheet M is performed by the third-stage punching section 243. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 243a and the female die 243b do not occur. By the above-mentioned first punching process SH4 to third punching process SH6, except for the outer portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more, and a decrease in concentration is suppressed.

[0144] In the subsequent lamination and bonding process SH7, the electromagnetic steel sheet 40, the periphery of which has been punched out from the strip-shaped steel sheet M by the outer periphery punching male die 261, is laminated on the upper surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, press processing oil b and dots of adhesive c applied on the press processing oil b are arranged on the upper surface of the other electromagnetic steel sheet 40. The electromagnetic steel sheet 40 that has been punched out this time is heated in a state where it is laminated and pressed on the other electromagnetic steel sheet 40 that has been punched out the previous time. Then, the adhesive c on the upper surface of the other electromagnetic steel sheet 40 that has been punched out the previous time pushes aside the press processing oil b on its lower surface and is applied to the upper surface of the other electromagnetic steel sheet 40 that is below it. At the same time, the adhesive c pushes aside the press processing oil b on the lower surface of the electromagnetic steel sheet 40 that has been punched out this time, and mixes with the multiple hardening accelerators a. Since the hardening accelerator a mixes with the adhesive c while maintaining its concentration, the adhesive c hardens instantly and bonds both electromagnetic steel sheets 40 together. Meanwhile, while the electromagnetic steel sheet 40 that has been peripherally punched this time is being laminated onto the other electromagnetic steel sheets 40, adhesive c is applied from a nozzle 253 to the top surface of the electromagnetic steel sheet 40 that has been peripherally punched this time. This adhesive c is in a liquid state since it is on the top surface of the electromagnetic steel sheet 40 and has not yet been mixed with the hardening accelerator a.

[0145] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SH8, it is determined whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. If the number has not reached the predetermined number (determination: NO), the flow returns to the steel sheet delivery step SH1, and the steel sheet delivery step SH1 to the stacking and bonding step SH7 are repeated again. On the other hand, if the number has reached the predetermined number in the stacking number confirmation step SH8 (determination: YES), the flow proceeds to the removal step SH9. In the subsequent removal step SH9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0146] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1A) described in the sixth embodiment. In addition, this embodiment has the following features and effects of (6A). (6A) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched this time and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched previously. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has a lower surface (first surface), a hardening accelerator a placed on the lower surface, and a press processing oil b placed on the hardening accelerator a, and which has been peripherally punched out this time; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has an upper surface (second surface), a press processing oil b placed on the upper surface, and an adhesive c placed on the press processing oil b, and a third step of overlapping and adhering the electromagnetic steel sheets 40 together so that the lower surface (first surface) and the upper surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (6A) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator maintains its original high concentration.

[0147] [Tenth embodiment] A tenth embodiment of the laminated core manufacturing method of the present invention will be described with reference to the flow chart of Fig. 14. In this embodiment, the bonded laminated core manufacturing apparatus 100 described with reference to Fig. 3 is used. As shown in FIG. 14, the adhesive laminated core manufacturing method of this embodiment includes a steel plate feeding process SI1, a hardening accelerator application process SI2, a processing oil application process SI3, a first punching process SI4, a second punching process SI5, an adhesive application process SI6, a stacking and bonding process SI7, a stack number confirmation process SI8, and a removal process SI9.

[0148] In the steel plate delivery process SI1, the steel plate strip M is delivered from the hoop material F of the steel plate strip supply section 110 toward the downstream side. In the subsequent hardening accelerator application process SI2, the hardening accelerator a in the tank 121 is flowed into the underside application line 125 by switching the valve 122. Then, the hardening accelerator a is applied in the form of numerous dots from the lower nozzle 126 onto the entire underside of the strip steel plate M. The hardening accelerator a at this time is applied in the form of dots onto the insulating coating formed on the underside of the strip steel plate M, and has a viscosity in the range of 0.01 Pa s to 100 Pa s. The hardening accelerator a applied in the form of dots is equally spaced from one another and applied over the entire underside of the strip steel plate M.

[0149] In the subsequent processing oil application step SI3, the strip-shaped steel sheet M is sandwiched between the upper roller 131a and the lower roller 131b. Then, the upper roller 131a rolls in contact with the upper surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. Similarly, the lower roller 131b rolls in contact with the lower surface of the steel sheet M with the press processing oil b supplied from the press processing oil supply unit permeating its outer circumferential surface. As a result, the press processing oil b is applied to the entire surface of both the upper and lower surfaces of the strip-shaped steel sheet M. At this time, the viscosity of the hardening accelerator a is 0.01 Pa·s or more, so the hardening accelerator a is prevented from mixing with the press processing oil b and reducing its concentration.

[0150] In the subsequent first punching process SI4, the first punching of the strip steel sheet M is performed by the first-stage punching unit 141. At this time, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 141a and the female die 141b do not occur. In the subsequent second punching process SI5, the second punching of the strip steel sheet M is performed by the second-stage punching section 142. At this time as well, since the press processing oil b has been applied in advance to the upper and lower surfaces of the strip steel sheet M, defects in the press processing such as seizure between the male die 142a and the female die 142b do not occur. By the above-mentioned first punching process SI4 and second punching process SI5, except for the outer shape portion, the core-back portion 22 and the teeth portion 23 shown in Fig. 1 are formed in the strip-shaped steel sheet M. In addition, the viscosity of the hardening accelerator a is maintained at 0.01 Pa s or more.

[0151] In the subsequent adhesive application process SI6, adhesive c discharged from a nozzle 153 is applied onto the press processing oil b on the lower surface of the strip steel plate M. At this time, adhesive c is applied in the form of a plurality of dots having a predetermined thickness and a predetermined diameter. Since adhesive c has not yet been mixed with hardening accelerator a, it is in a liquid state. In the subsequent lamination and bonding process SI7, the electromagnetic steel sheet 40 whose periphery has been punched out of the strip-shaped steel sheet M by the outer periphery punching male die 161 is laminated on the top surface of the other electromagnetic steel sheet 40 that has been punched out previously. At this time, press processing oil b is placed on the top surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously. The electromagnetic steel sheet 40 whose periphery has been punched out this time is laminated on top of this and heated while being pressurized. Then, the adhesive c on the bottom surface of the electromagnetic steel sheet 40 whose periphery has been punched out this time pushes aside the press processing oil b on the top surface of the electromagnetic steel sheet 40 whose periphery has been punched out previously and is applied to the top surface of the electromagnetic steel sheet 40 that is underneath. At the same time as this application, the adhesive c pushes aside the press processing oil b of the electromagnetic steel sheet 40 whose periphery has been punched out this time and mixes with the hardening accelerator a on top. The adhesive c mixed with the hardening accelerator a in this way instantly hardens and bonds the two electromagnetic steel sheets 40 together.

[0152] By sequentially repeating the above steps, a predetermined number of electromagnetic steel sheets 40 are laminated and bonded together, and the bonded laminated core 21 for the stator is completed. That is, in the stacking number confirmation step SI8, it is judged whether or not the number of stacked electromagnetic steel sheets 40 has reached a predetermined number. As a result, if it has not reached that number (judgment: NO), the flow returns to the steel sheet delivery step SI1, and the steel sheet delivery step SI1 to the stacking and bonding step SI7 are repeated again. On the other hand, if the predetermined number has been reached in the stacking number confirmation step SI8 (judgment: YES), the flow proceeds to the removal step SI9. In the subsequent removal step SI9, the completed bonded laminated core 21 for a stator is removed from the outer periphery punching female die 162, thereby completing all steps of the bonded laminated core manufacturing method.

[0153] The adhesive laminated core manufacturing method of this embodiment described above has the same features and effects as those of (1A) described in the sixth embodiment. In addition, this embodiment has the following features and effects of (6A). (6A) Each electromagnetic steel sheet 40 includes an electromagnetic steel sheet 40 (first steel sheet component) whose periphery has been punched this time and an electromagnetic steel sheet 40 (second steel sheet component) whose periphery has been punched previously. The method includes a first step of preparing an electromagnetic steel sheet 40 (first steel sheet component) which has a lower surface (first surface), a hardening accelerator a placed on the lower surface, and a press processing oil b placed on the hardening accelerator a and which has been peripherally punched out in the current process; a second step of preparing an electromagnetic steel sheet 40 (second steel sheet component) which has an upper surface (second surface) and a press processing oil b placed on the upper surface and which has been peripherally punched out in the previous process; and a third step of overlapping and adhering the electromagnetic steel sheets 40 so that the lower surface (first surface) and the upper surface (second surface) face each other. According to the method for manufacturing a bonded laminated core described in (6A) above, in the first step, the hardening accelerator a is in a state in which a decrease in concentration due to the press processing oil b is suppressed. Therefore, in the third step, bonding between the magnetic steel sheets 40 can be performed while the hardening accelerator a maintains its original high concentration. EXAMPLES

[0154] Using the manufacturing apparatus 100 shown in Fig. 3, the above-mentioned stator core 21 (hereinafter, stator core) was manufactured using non-oriented electromagnetic steel sheets having a thickness of 0.25 mm under various manufacturing conditions, and the peel strength of the stator core was evaluated. The results are shown in Tables 1A and 1B.

[0155] [Table 1A]

[0156] [Table 1B]

[0157] The average viscosity of the curing accelerators shown in Tables 1A and 1B was measured using the method described above. Nos. 1 to 10 in Table 1A, in which the average viscosity of the curing accelerator is in the range of 0.01 Pa·s or more and 100 Pa·s or less, are examples of the invention. On the other hand, No. 11 in Table 1B, in which the average viscosity of the curing accelerator is less than 0.01 Pa·s, and Nos. 12, 13, and 17 in which the average viscosity is more than 100 Pa·s, are comparative examples. Similarly, Nos. 14 to 16 in Table 1B, in which no curing accelerator is used, are also comparative examples. Table 1B also shows, as comparative examples, No. 18, in which the average viscosity of the adhesive was adjusted to 1 Pa s while the average viscosity of the curing accelerator was less than 0.01 Pa s, and No. 19, in which the average viscosity of the adhesive was adjusted to 0.05 Pa s while the average viscosity of the curing accelerator was more than 100 Pa s. Table 1B also shows Comparative Example 20, in which the average viscosity of the curing accelerator fell within the range of 0.01 Pa s to 100 Pa s, but was applied after the application of press processing oil.

[0158] The peel strength of the stator core was measured by pressing a wedge into the center of the laminated surface to open the laminated surface and separate the iron core. Here, the wedge had a tip angle of 7 degrees. The wedge was pressed into the center height position in the lamination direction of the stator core. In Tables 1A and 1B, the higher the peel strength of the stator core, the higher the rigidity of the stator core, which is preferable. In Tables 1A and 1B, the criterion for judging the rigidity of the stator core was that a peel strength of less than 1 MPa was judged to be "failed." When the peel strength was 1 MPa or more but less than 2 MPa, the stator core was judged to be "passable" because it was at a level that did not cause any problems in handling the stator core. When the peel strength was 2 MPa or more but less than 5 MPa, the adhesion strength was high and vibrations could be reduced, so it was judged to be "good." When the peel strength was 5 MPa or more but less than 10 MPa, the adhesion strength of the stator core and the stress applied to the stator core were balanced in the range, so it was judged to be "excellent." When the peel strength is 10 MPa or more but less than 15 MPa, it is judged as "good" because a higher peel strength makes it easier to apply stress to the stator core. When the peel strength is 15 MPa or more, it is judged as "passable" because it takes into consideration that the stress applied to the stator core will be even higher. In order to prevent the stress applied to the stator core from becoming too high, it is considered that the upper limit of the peel strength should be set to 20 MPa. Therefore, the preferable range of the peel strength is 1 MPa or more and 20 MPa or less.

[0159] The core iron loss shown in Tables 1A and 1B is the energy loss generated in the stator core, and was evaluated as the energy loss in a rotating magnetic field by the method described in Japanese Patent No. 2740553. That is, search coils were applied to four different points in the circumferential direction of the core back part, and the energy loss was obtained when magnetizing to obtain a magnetic flux density of 1.5 T as the average value of the four points. Then, this energy loss was divided by the weight of the stator core to convert it to a unit of W / kg, which was used as the iron loss of the stator core. The above energy loss was calculated from the difference in induced torque when the stator core was rotated at 300 rpm and an excitation current was applied to the excitation yoke arranged in the center of the stator core and when it was turned off. That is, the energy loss was calculated by utilizing the relationship that the product of the induced torque and the rotation speed is equal to the energy generated in the stator core. The smaller the core iron loss, the higher the magnetic properties, which is preferable. In Tables 1A and 1B, the core iron loss is judged as "pass" when the value is 12 W / kg or less, as "fair" when it is in the range of more than 12 W / kg and less than 13 W / kg, and as "fail" when it is more than 13 W / kg.

[0160] The curing times shown in Tables 1A and 1B are preferably shorter, with 1 minute or less being judged as "passed," more than 1 minute and less than 5 minutes being judged as "fair," and more than 5 minutes being judged as "failed."

[0161] In Table 1A, No. 1 (example of the invention) used an anaerobic adhesive as the adhesive. Also, a manganese- and copper-containing compound was used as the curing accelerator. The average viscosity of the curing accelerator was 0.03 Pa·s. The stator core manufactured by bonding using this combination of adhesive and curing accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and curing time. Next, in No. 2 (invention example), an anaerobic adhesive was used as the adhesive. Also, a manganese and copper-containing compound was used as the hardening accelerator. The average viscosity of the hardening accelerator was 0.3 Pa·s. The stator core manufactured by bonding using this combination of adhesive and hardening accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and hardening time. Next, in No. 3 (example of the invention), an anaerobic adhesive was used as the adhesive. Also, a manganese and copper-containing compound was used as the hardening accelerator. The average viscosity of the hardening accelerator was 2.5 Pa·s. The stator core manufactured by bonding with this combination of adhesive and hardening accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and hardening time. Next, in No. 4 (invention example), an anaerobic adhesive was used as the adhesive. Also, a vanadium and copper-containing compound was used as the hardening accelerator. The average viscosity of the hardening accelerator was 0.5 Pa s. The stator core manufactured by bonding with this combination of adhesive and hardening accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and hardening time.

[0162] Next, in No. 5 (invention example), an anaerobic adhesive was used as the adhesive. Also, a vanadium and copper-containing compound was used as the hardening accelerator. The average viscosity of the hardening accelerator was 1.5 Pa s. The stator core manufactured by bonding using this combination of adhesive and hardening accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and hardening time. Next, in No. 6 (invention example), an anaerobic adhesive was used as the adhesive. Also, a vanadium and copper-containing compound was used as the hardening accelerator. The average viscosity of the hardening accelerator was 6 Pa·s. The stator core manufactured by bonding using this combination of adhesive and hardening accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and hardening time. Next, in No. 7 (invention example), an instant adhesive was used as the adhesive. Also, a compound containing dimethylaniline and diethylamine was used as the curing accelerator. The average viscosity of the curing accelerator was 1.2 Pa s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and curing time. Next, in No. 8 (invention example), an instant adhesive was used as the adhesive. Also, a compound containing dimethylaniline and diethylamine was used as the curing accelerator. The average viscosity of the curing accelerator was 9 Pa·s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator was "passed" in terms of the stator core's peel strength, core iron loss, and curing time.

[0163] Next, in No. 9 (invention example), an instant adhesive was used as the adhesive. Also, a compound containing diethylamine and phenylenediamine was used as the curing accelerator. The average viscosity of the curing accelerator was 65 Pa s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator was "passed" in all aspects of the stator core peel strength, core iron loss, and curing time. Next, in No. 10 (invention example), an instant adhesive was used as the adhesive. Also, a compound containing diethylamine and phenylenediamine was used as the curing accelerator. The average viscosity of the curing accelerator was 95 Pa s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator was "passed" in all aspects of the stator core peel strength, core iron loss, and curing time.

[0164] Next, in Table 1B, in No. 11 (comparative example), an anaerobic adhesive was used as the adhesive. Also, a manganese- and copper-containing compound was used as the curing accelerator. The average viscosity of the curing accelerator was 0.005 Pa·s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator "failed" in terms of peel strength of the stator core. This is thought to be because the average viscosity of the curing accelerator was too low, causing the active ingredients of the curing accelerator to dissolve and diffuse into the press processing oil.

[0165] Next, in No. 12 (comparative example), an instant adhesive was used as the adhesive. In addition, a compound containing diethylamine and phenylenediamine was used as the curing accelerator. The average viscosity of the curing accelerator was 120 Pa·s. In the stator core manufactured by bonding with a combination of these adhesives and curing accelerators, the peel strength was "passed" but the core iron loss was "failed". The reason for the "failed" core iron loss is thought to be that the average viscosity of the curing accelerator used was extremely high. In other words, if the average viscosity of the curing accelerator interposed between each non-oriented electromagnetic steel sheet is extremely high, it cannot spread widely along the lamination surface of each non-oriented electromagnetic steel sheet when it is pressurized during lamination. As a result, the pressure applied to each non-oriented electromagnetic steel sheet becomes a local pressure force due to the presence of the curing accelerator that cannot be spread, and acts on each non-oriented electromagnetic steel sheet. Therefore, it is presumed that the core iron loss was "failed" because local stress is applied to the non-oriented electromagnetic steel sheet or even deformation is caused. Next, in No. 13 (comparative example), an instant adhesive was used as the adhesive. Also, succinimide and a compound containing phenylenediamine were used as the curing accelerator. The average viscosity of the curing accelerator was 360 Pa s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator passed the peel strength test, but failed the core iron loss test. The reason for failing the core iron loss test is presumed to be the same as for No. 12.

[0166] Next, in No. 14 (comparative example), an anaerobic adhesive was used as the adhesive. However, no curing accelerator was used. In the stator core manufactured in this case, the peel strength was "fail," the core iron loss was "pass," and the curing time was "pass." In this case, sufficient adhesive strength was not obtained because no curing accelerator was used, and as a result, the peel strength was failed. Next, in No. 15 (comparative example), an instant adhesive was used as the adhesive. However, no curing accelerator was used. In the stator core manufactured in this case, the peel strength was "failed", the core iron loss was "passed", and the curing time was "passed". In this case, sufficient adhesive strength was not obtained because no curing accelerator was used, and as a result, the peel strength was failed. Next, in No. 16 (Comparative Example), a urethane adhesive was used as the adhesive. However, no curing accelerator was used. In the stator core manufactured in this case, the peel strength was "passed", but the core iron loss was "failed" and the curing time was also "failed". This is thought to be because the adhesive used was a urethane adhesive, which took too long to cure and the adhesive strength was too strong, causing the core iron loss to deteriorate.

[0167] Next, in No. 17 (comparative example), an epoxy adhesive was used as the adhesive. Also, an amine-based hardener was used as the hardening accelerator. The average viscosity of the hardening accelerator was 2500 Pa s. In the stator core manufactured by bonding using this combination of adhesive and hardening accelerator, the peel strength was "passed", but the core iron loss was "failed" and the hardening time was also "failed". The reason for the "failed" core iron loss is presumed to be the same as No. 12.

[0168] Next, in No. 18 (Comparative Example), an anaerobic adhesive was used as the adhesive. Also, a manganese- and copper-containing compound was used as the curing accelerator. In this Comparative Example, the average viscosity of the adhesive was adjusted to be within the range of 0.01 Pa·s to 100 Pa·s, and set to 1 Pa·s, while the average viscosity of the curing accelerator was 0.005 Pa·s. The stator core manufactured by bonding with this combination of adhesive and curing accelerator was "failed" in terms of peel strength of the stator core. This is thought to be because the average viscosity of the curing accelerator was too low, causing the active ingredients of the curing accelerator to dissolve and diffuse into the press processing oil.

[0169] Next, in No. 19 (Comparative Example), an instant adhesive was used as the adhesive. Also, succinimide and a compound containing phenylenediamine were used as the curing accelerator. In this Comparative Example, the average viscosity of the adhesive was adjusted to 0.05 Pa·s so as to be within the range of 0.01 Pa·s to 100 Pa·s, while the average viscosity of the curing accelerator was 360 Pa·s. In the stator core manufactured by bonding using this combination of adhesive and curing accelerator, the peel strength was "passed", but the average viscosity of the curing accelerator was too high, so the core iron loss was "failed". The reason for the "failed" core iron loss is presumed to be the same as that of No. 12.

[0170] Next, in No. 20 (comparative example), the same combination of adhesive and hardening accelerator as in Example 2 was used. In addition, the average viscosity of the hardening accelerator was also set to 0.3 Pa·s, the same as in Example 2. However, the application process was changed. Specifically, press processing oil was applied first, followed by pressing, and then hardening accelerator application. Furthermore, the adhesive was applied and then laminated to produce a stator core. In this No. 20, although the average viscosity of the hardening accelerator was appropriate, the application was performed after the application of the press processing oil, so the hardening accelerator mixed with the previously applied press processing oil and diffused into the press processing oil, and it seems that a sufficient hardening acceleration effect was not obtained. Therefore, it was "failed" in both peel strength and hardening time. From the results of this No. 20, it can be understood that the process of applying the hardening accelerator to the surface of the electromagnetic steel sheet must be performed before the process of applying the press processing oil.

[0171] As explained above, in the invention examples No. 1 to No. 10, in which the average viscosity of the curing accelerator is 0.01 Pa s to 100 Pa s, the peel strength of the stator core, core iron loss, and curing time were all "passed." It was confirmed that these invention examples can achieve higher productivity while ensuring sufficient adhesive strength when manufacturing bonded laminated cores.

[0172] The above describes the embodiments and examples of the present invention. However, the technical scope of the present invention is not limited to the above embodiments and examples, and various modifications can be made without departing from the spirit of the present invention. For example, in each embodiment, the case where the hardening accelerator is applied to only one of the upper and lower surfaces of the strip steel sheet M has been exemplified. However, the present invention is not limited to this embodiment, and the hardening accelerator a may be applied to both the upper and lower surfaces of the strip steel sheet M. For this purpose, a combination of the above-mentioned embodiments may be adopted. In that case, for example, in the bonded laminated core manufacturing apparatus 100 shown in FIG. 3, the valve 122 may be removed so that the hardening accelerator a is supplied to both the upper surface coating line 123 and the upper nozzle 124 and the lower surface coating line 125 and the lower nozzle 126. Furthermore, if necessary, the adhesive c may also be applied to both the upper and lower surfaces of the strip steel sheet M. In that case, it is preferable to employ an apparatus configuration that includes both the adhesive application unit 150 shown in Fig. 3 and the adhesive application unit 250 shown in Fig. 4.

[0173] In each embodiment, a permanent magnet field type motor has been used as an example of the rotating motor 10, but the structure of the rotating motor 10 is not limited to this, as exemplified below, and various known structures not exemplified below can also be adopted. In each embodiment, a permanent magnet field type motor has been described as an example of the rotating electric machine 10, but the present invention is not limited to this. For example, the rotating electric machine 10 may be a reluctance type motor or an electromagnetic field type motor (wound field type motor). In each embodiment, a synchronous motor has been described as an example of an AC motor, but the present invention is not limited to this. For example, the rotating electric machine 10 may be an induction motor. In each embodiment, an AC motor has been described as an example of the rotating electric machine 10, but the present invention is not limited to this. For example, the rotating electric machine 10 may be a DC motor. In each embodiment, an electric motor has been given as an example of the rotating electric machine 10, but the present invention is not limited to this. For example, the rotating electric machine 10 may be a generator.

[0174] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Industrial Applicability]

[0175] According to the above-mentioned aspects of the present invention, it is possible to provide a method and an apparatus for manufacturing a bonded laminated core, which can ensure sufficient adhesive strength and achieve higher productivity when manufacturing a bonded laminated core, and thus has high industrial applicability. [Explanation of symbols]

[0176] 21 Adhesive laminated core for stator (adhesive laminated core, stator for rotating electric machine) 40 Electromagnetic steel plate (steel plate parts, first steel plate parts, second steel plate parts) 100,200,300,400 Bonded laminated core manufacturing equipment 120, 220, 320 Curing accelerator application section 130,230,330 Press processing oil application section 140,240,340 Press processing section 150,250,350 Adhesive application section A. First Stage a. Curing accelerator B. Second Stage b. Press processing oil c. Adhesive M Steel strip

Claims

1. A method for manufacturing an adhesive laminated core, comprising the steps of: pressing a strip of steel plate having press working oil applied to one or both sides thereof; applying an adhesive to one side of the strip of steel plate to obtain a plurality of steel plate parts; and laminating and bonding the steel plate parts together, the method comprising the steps of: A hardening accelerator having an average viscosity of 0.01 Pa·s to 100 Pa·s is applied to one or both sides of the strip steel plate before the press processing oil is applied. A method for manufacturing a bonded laminated core.

2. The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate part having a first surface, the hardening accelerator disposed on the first surface, and the press processing oil disposed on the hardening accelerator; a second step of providing the second steel sheet component having a second surface and the adhesive disposed on the second surface; a third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; 2. The method of claim 1, further comprising the steps of:

3. The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate part having a first surface, the hardening accelerator disposed on the first surface, the press processing oil disposed on the hardening accelerator, and the adhesive disposed on the press processing oil; A second step of providing the second steel sheet component having a second surface; a third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; 2. The method of claim 1, further comprising the steps of:

4. The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel sheet component having a first surface and the hardening accelerator disposed on the first surface; a second step of preparing the second steel plate component having a second surface, the press oil disposed on the second surface, and the adhesive disposed on the press oil; a third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; 2. The method of claim 1, further comprising the steps of:

5. The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate part having a first surface, the hardening accelerator disposed on the first surface, and the press processing oil disposed on the hardening accelerator; a second step of preparing the second steel plate component having a second surface, the press oil disposed on the second surface, and the adhesive disposed on the press oil; a third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; 2. The method of claim 1, further comprising the steps of:

6. The steel plate components include a first steel plate component and a second steel plate component, A first step of preparing the first steel plate part having a first surface, the hardening accelerator disposed on the first surface, the press processing oil disposed on the hardening accelerator, and the adhesive disposed on the press processing oil; a second step of preparing the second steel sheet component having a second surface and the press processing oil disposed on the second surface; a third step of overlapping and adhering the first steel plate part and the second steel plate part so that the first surface and the second surface face each other; 2. The method of claim 1, further comprising the steps of:

7. 7. The method for manufacturing a bonded laminated core according to claim 1, wherein the adhesive is an anaerobic adhesive or an instant adhesive.

8. the adhesive is an anaerobic adhesive, The cure accelerator comprises an active ingredient that promotes anaerobic cure selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof.

8. The method of claim 7, wherein the adhesive laminated core is made of a sintered material.

9. The adhesive is an instant adhesive, The curing accelerator contains an active ingredient that accelerates the curing of the instant adhesive, selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, and N,N-diethylaniline; acid amides such as trichloroacetamide; organic imides such as succinimide; quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride; and combinations thereof.

8. The method of claim 7, wherein the adhesive laminated core is made of a sintered material.

10. 2. The method for manufacturing a bonded laminated core according to claim 1, wherein the bonded laminated core is a stator for a rotating electrical machine.

11. An apparatus for manufacturing an adhesive laminated core having a plurality of steel plate parts punched out from a strip-shaped steel plate, A press working oil application unit that applies press working oil to one side or both sides of the strip steel plate; a press working unit that applies press working to the strip steel plate; an adhesive application section that applies an adhesive to one surface of the strip steel plate; a hardening accelerator application section for applying a hardening accelerator having an average viscosity of 0.01 Pa·s to 100 Pa·s to one or both sides of the strip steel plate before the strip steel plate reaches the press processing oil application section; An apparatus for manufacturing a bonded laminated core, comprising:

12. 12. The apparatus for manufacturing a bonded laminated core according to claim 11, wherein the adhesive is an anaerobic adhesive or an instant adhesive.

13. the adhesive is an anaerobic adhesive, The cure accelerator comprises an active ingredient that promotes anaerobic cure selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium, saccharin, and combinations thereof.

13. An apparatus for manufacturing a bonded laminated core according to claim 12.

14. The adhesive is an instant adhesive, The curing accelerator contains an active ingredient that accelerates the curing of the instant adhesive, selected from organic amines such as dimethylaniline, diethylamine, o-phenylenediamine, dimethyl paratoluidine, diethyl paratoluidine, and N,N-diethylaniline; acid amides such as trichloroacetamide; organic imides such as succinimide; quaternary ammonium salts such as tetramethylammonium chloride and benzyltrimethylammonium chloride; and combinations thereof.

13. An apparatus for manufacturing a bonded laminated core according to claim 12.

15. 15. The bonded laminated core manufacturing apparatus according to claim 11, wherein the bonded laminated core is a stator for a rotating electric machine.

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