Device for manufacturing laminated core and method for manufacturing laminated core

Abstract

This device for manufacturing a laminated core comprises: an upper mold and a lower mold for punching a core by pressing a steel strip being transported downstream; a lamination part which is provided in the lower mold and laminates a punched core; an application part which is provided upstream of the lamination part in the lower mold in the transport direction of the steel strip, and applies an adhesive to the lower surface of the steel strip, the application part being in contact with a restraint part, provided in the lower mold, and thus restrained in movement in a direction crossing the mold opening / closing direction; and a discharge mechanism which is provided in the lower mold and discharges the remaining unapplied adhesive from the application part.

Description

Laminated core manufacturing apparatus and laminated core manufacturing method

[0001] The present disclosure relates to a laminated core manufacturing apparatus and a laminated core manufacturing method.

[0002] A method is known in which a strip-shaped steel plate is pressed to punch out steel plate parts, and the punched steel plate parts are bonded with an adhesive to produce a laminated core (see, for example, JP 2017-216873 A, JP 5375264 A, JP 6515241 A, and JP 7138899 A).

[0003] In order to bond punched steel plate parts together, adhesive is applied to the steel strip before punching. However, depending on the punching speed of the steel strip, it is difficult to apply the appropriate amount of adhesive to the steel strip, and excess adhesive is likely to be generated. If excess adhesive adheres to the mold and hardens, it can clog the mold, or if the adhesive gets into the sliding parts, it can cause wear. In severe cases, it can cause problems such as chipping. Therefore, excess adhesive adhering to the mold must be removed promptly, and frequent maintenance is required.

[0004] The present disclosure aims to provide a technology that can extend the maintenance cycle even when excess adhesive is generated when applying adhesive to a strip of steel plate when pressing and applying adhesive inside a mold to bond steel plate parts together.

[0005] A laminated core manufacturing apparatus according to one embodiment of the present disclosure comprises upper and lower dies that press a strip steel plate being fed downstream to punch out a core, a stacking section provided in the lower die that stacks the punched cores, an application section provided upstream of the stacking section of the lower die in the feeding direction of the strip steel plate that applies adhesive to the underside of the strip steel plate, the application section being in contact with a restraint section provided in the lower die and restrained in its movement in a direction intersecting the die opening and closing direction, and a discharge mechanism provided in the lower die that discharges excess adhesive from above the application section.

[0006] Another aspect of the manufacturing method for laminated cores of the present disclosure involves sending a strip of steel plate toward upper and lower molds that press the plate to punch out steel plate parts, applying adhesive to the underside of the strip of steel plate from an application section provided on the lower mold that is in contact with a restraint section provided on the lower mold and is restrained from moving in a direction intersecting the mold opening and closing direction, while an ejection mechanism provided on the lower mold ejects any excess adhesive from above the application section, and stacking the cores punched out of the strip of steel plate by pressing the upper and lower molds while bonding them with the adhesive.

[0007] According to the present disclosure, when steel plate parts are bonded together by pressing and applying adhesive inside a mold, even if excess adhesive is produced when applying adhesive to the strip steel plate, maintenance will not be required for a long period of time.

[0008] It is a perspective view of a laminated core manufactured by the manufacturing apparatus of the embodiment. It is a schematic side view of the manufacturing apparatus of the embodiment. It is a plan view of a coating head. It is a side view of a coating head. It is a cross-sectional view of a coating head. It is an enlarged view of a part indicated by an arrow 6X in Figure 5. It is a cross-sectional view of the periphery of the coating head.

[0009] Hereinafter, embodiments for implementing the technology of the present disclosure will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same or similar components. Note that duplicated explanations and reference numerals may be omitted in the embodiments described below. Furthermore, all drawings used in the following description are schematic, and the dimensional relationships, ratios, etc. of each element shown in the drawings do not necessarily match those of reality. Furthermore, the dimensional relationships, ratios, etc. of each element between multiple drawings do not necessarily match.

[0010] First, a laminated core manufacturing apparatus according to this embodiment will be described, followed by a laminated core manufacturing method according to this embodiment. The laminated core 20 manufactured using the manufacturing apparatus and method according to this embodiment is used, for example, in a stator or rotor core constituting a rotating electric machine. This rotating electric machine is, for example, an electric motor. The electric motor may be an AC motor, a synchronous motor, or a permanent magnet field motor. This type of electric motor is preferably used, for example, in electric vehicles. In this embodiment, the laminated core 20 will be described as a bonded laminated core for a stator, as shown in FIG. 1 . The laminated core 20 has an annular core back portion 24 and a plurality of teeth 26 extending radially inward from the core back portion 24.

[0011] 2, the laminated core manufacturing apparatus 30 of this embodiment (hereinafter simply referred to as "manufacturing apparatus 30") is an apparatus that presses a strip-shaped steel sheet M to punch out steel plate parts 22, and then adheres and stacks the punched steel plate parts 22 with an adhesive, thereby manufacturing the laminated core 20. Note that the arrow UP in FIG. 2 points upward.

[0012] The manufacturing apparatus 30 includes a feed section 40, an oil application section 50, a press processing section 60, an adhesive application section 70, and a lamination section 80. The manufacturing apparatus 30 also includes a fixed mold 90 and a movable mold 92. The fixed mold 90 is located on the lower side in the vertical direction, and is therefore also referred to as a lower mold. The movable mold 92 is located on the upper side in the vertical direction, and is therefore also referred to as an upper mold. The movable mold 92 moves vertically relative to the fixed mold 90 by a drive mechanism (not shown).

[0013] The delivery section 40 is a portion of the manufacturing apparatus 30 that delivers the steel strip M, which is the raw material for the steel plate components 22. Specifically, the delivery section 40 unwinds and delivers the steel strip M from the wound hoop material F. More specifically, the delivery section 40 includes a hoop feed device 42. The hoop feed device 42 unwinds and delivers the steel strip M from the hoop material F. The hoop feed device 42 includes, for example, a pair of clamping rolls 44. The steel strip M is sandwiched between the pair of clamping rolls 44 on both sides and delivered. The steel strip M is delivered from the delivery section 40 to the oil application section 50, the press processing section 60, the adhesive application section 70, and the lamination section 80. The direction in which the steel strip M is delivered is referred to as the delivery direction and is indicated by the symbol C in the figure. In the following, the terms "downstream" and "downstream side" refer to the downstream side of the delivery direction of the steel strip M. Furthermore, the terms "upstream" and "upstream side" refer to the upstream side in the feeding direction of the steel strip M.

[0014] The strip steel sheet M is, for example, an electromagnetic steel sheet. As the electromagnetic steel sheet, a known electromagnetic steel sheet may be used. For example, as the electromagnetic steel sheet, a non-oriented electromagnetic steel sheet or a non-oriented electromagnetic steel sheet may be used. As the non-oriented electromagnetic steel sheet, a non-oriented electrical steel strip according to JIS C2552:2014 may be used. As the oriented electrical steel sheet, a oriented electrical steel strip according to JIS C2553:2012 may be used. Furthermore, both surfaces of the strip steel sheet M may be coated with an insulating coating.

[0015] The oil application unit 50 is a part of the manufacturing apparatus 30 that applies oil to the strip steel sheet M that is the raw material for the steel sheet parts 22. The oil application unit 50 is equipped with, for example, a plurality of nozzles 52 that spray and apply oil toward one side of the strip steel sheet M. Oil is supplied to each nozzle 52 from an oil supply source (not shown). In this embodiment, the oil application unit 50 applies processing oil for press working to the strip steel sheet M. In this embodiment, each nozzle 52 faces downward to apply the oil. Therefore, the oil is applied to the top surface of the strip steel sheet M. The oil is applied across the entire width of the strip steel sheet M.

[0016] The press working section 60 is a section of the manufacturing apparatus 30 that performs punching on the strip steel plate M. The press working section 60 includes a first-stage punching section 62 and a second-stage punching section 64.

[0017] The first-stage punching section 62 is disposed downstream of the oil application section 50 and has a male die 62a and a female die 62b.

[0018] The male die 62a and the female die 62b are arranged coaxially in the vertical direction. The steel strip M passes between the male die 62a and the female die 62b. That is, when the laminated core 20 is manufactured, the male die 62a faces the upper surface of the steel strip M, and the female die 62b faces the lower surface of the steel strip M.

[0019] In this embodiment, the female die 62b is fixed to the upper surface of the fixed die 90, and the male die 62a is fixed to the lower surface of the movable die 92. Therefore, when the movable die 92 moves up and down relative to the fixed die 90, the male die 62a enters the female die 62b.

[0020] With the delivery of the steel strip M temporarily stopped, the male die 62a is moved downward into the female die 62b, whereby the first punching process required to form the steel sheet part 22 is carried out on the steel strip M. At this time, oil is applied to the upper surface of the steel strip M, so that the punching process can be carried out without causing seizure or the like. After this punching process, the male die 62a is moved upward and withdrawn from the female die 62b, and the steel strip M is delivered downstream.

[0021] The second-stage punching section 64 is disposed downstream of the first-stage punching section 62 and has a male die 64a and a female die 64b.

[0022] In this embodiment, the female die 64b is fixed to the upper surface of the fixed die 90, and the male die 64a is fixed to the lower surface of the movable die 92. Therefore, when the movable die 92 moves up and down relative to the fixed die 90, the male die 64a enters the female die 64b.

[0023] The male die 64a and the female die 64b are arranged coaxially in the vertical direction. The steel strip M after the first punching process passes between the male die 64a and the female die 64b. That is, the male die 64a faces the upper surface of the steel strip M, and the female die 64b faces the lower surface of the steel strip M.

[0024] With the delivery of the steel strip M temporarily stopped again, a hydraulic mechanism (not shown) moves the male die 64a downward into the female die 64b, thereby performing the second punching process required to form the steel sheet part 22 from the steel strip M. At this time, oil is applied to the upper surface of the steel strip M, so that the punching process can be performed without causing seizure or the like. After this punching process, the male die 64a is moved upward and withdrawn from the female die 64b, and the steel strip M is delivered downstream.

[0025] The first-stage punching portion 62 and the second-stage punching portion 64 form a plurality of teeth 26 of the stator in the strip steel plate M. The plurality of teeth 26 are portions where the windings constituting the stator are wound in a concentrated or distributed manner.

[0026] The adhesive application unit 70 is a part of the manufacturing apparatus 30 that has the function of applying adhesive to one side (the lower side) of the strip steel sheet M. The adhesive application unit 70 includes an adhesive supply device 72, a supply path 74, a coating head 76, a steel sheet holder 71, and a discharge mechanism 110.

[0027] The adhesive supply device 72 is a device that supplies adhesive to the application head 76 from an adhesive container (not shown) that stores adhesive. An anaerobic adhesive, for example, is used as the adhesive that bonds the steel plate components 22 together. For example, "Arontight" (registered trademark) manufactured by Toagosei Co., Ltd. may be used as the anaerobic adhesive. Furthermore, the adhesive supply device 72 may be attached to the fixed mold 90 or may be installed in a location separate from the fixed mold 90. Similarly, the adhesive container may be attached to the fixed mold 90 or may be installed in a location separate from the fixed mold 90.

[0028] The supply path 74 is a flow path for supplying adhesive from the adhesive container to the application head 76. The member that constitutes the supply path 74 is made of, for example, a non-metallic material. Specifically, the supply path 74 is a pipe made of a resin material, i.e., a resin pipe.

[0029] The coating head 76 is attached to the tip of the supply path 74 and applies adhesive to the underside of the steel strip M. The coating head 76 is housed in a housing 91 provided on the upper surface of the fixed mold 90, with its movement restrained in a direction intersecting the mold opening / closing direction. Specifically, the outer peripheral surface 76 a of the coating head 76 contacts a side wall surface 91 a constituting the housing 91, thereby restraining the movement of the coating head 76 in a direction intersecting the mold opening / closing direction. The housing 91 is the inner portion of a bolt-type cylindrical holder 100. The holder 100 is fitted into a recess 102 of a protrusion 94 provided on the upper surface of the fixed mold 90. The coating head 76 is fitted into the holder 100, with its outer peripheral surface 76 a contacting the inner wall surface of the holder 100 (the side wall surface 91 a of the housing 91). The coating head 76 is supported by a support (not shown) provided on the holder 100. The application head 76 of the present embodiment is an example of an application section in the present disclosure. Arrows A in Figures 5 and 6 indicate the flow of adhesive.

[0030] As shown in Fig. 3, the application head 76 has a plurality of outlets 77 for discharging adhesive. As shown in Fig. 4, each outlet 77 faces upward. That is, each outlet 77 faces the lower surface of the strip-shaped steel sheet M when the laminated core 20 is manufactured.

[0031] 4, the application head 76 also has a reservoir 78 that stores adhesive supplied from the outside. Specifically, a resin pipe that forms the supply path 74 is connected to a connection port of the application head 76, and the supply path 74 communicates with the reservoir 78. The reservoir 78 communicates with each of the discharge ports 77. Therefore, the adhesive sent through the supply path 74 is discharged from each of the discharge ports 77 via the reservoir 78.

[0032] The reservoir 78 is a portion for storing adhesive, and is therefore formed only with a portion having a diameter larger than that of the discharge port 77 .

[0033] The coating head 76 of this embodiment has a ring-shaped protrusion 79 that protrudes from the surface (the upper surface in FIG. 4 ) of the coating head 76. The protrusion 79 is, for example, annular. A plurality of discharge ports 77 are formed in a top surface 79 a of the protrusion 79 at intervals in the circumferential direction of the protrusion 79.

[0034] In this embodiment, the entire application head 76 is made of a non-metallic material.

[0035] The non-metallic material constituting the dispensing head 76 is, for example, a resin material. Specifically, it is an organic resin material. In the present disclosure, continuous punching is performed. Therefore, the dispensing head 76 is required to have heat resistance so that it does not deform at 120°C in order to obtain sufficient mechanical strength. As such a resin material, it is preferable to use polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin, or polytetrafluoroethylene resin.

[0036] 7, the discharge mechanism 110 is a mechanism that discharges excess adhesive (indicated by dashed arrows in FIG. 7) from above the application head 76. The discharge mechanism 110 includes a first discharge path 112 and a second discharge path 114.

[0037] The first discharge path 112 is a flow path that discharges excess adhesive from above the application head 76. The first discharge path 112 is provided in the application head 76. Specifically, the first discharge path 112 is a groove that extends vertically and is provided on the outer periphery of the application head 76. The excess adhesive on the application head 76 flows down through the first discharge path 112 into the holder 100, i.e., into the storage portion 91.

[0038] Furthermore, the portion of the coating head 76 that forms the first discharge path 112 is made of a non-metallic material. Specifically, in this embodiment, the first discharge path 112 is formed on the outer periphery of the coating head 76, and therefore the coating head 76 and the first discharge path 112 are made of the same material. Note that only the first discharge path 112 may be made of a metallic material. For example, a metallic film may be formed on the surface of a groove formed on the outer periphery of the coating head 76 that is made of a resin material.

[0039] The second discharge path 114 is a flow path that communicates with the first discharge path 112 and discharges excess adhesive to the outside. The second discharge path 114 is provided in the fixed mold 90 and extends toward the outside of the fixed mold 90. Specifically, the second discharge path 114 is provided on the bottom surface of the accommodation portion 91, in other words, on the bottom portion 100a of the holder 100, and extends toward a collection container (not shown) provided outside the fixed mold 90. The adhesive that flows down from the first discharge path 112 accumulates in the holder 100 and is sent to the collection container through the second discharge path 114. In other words, the excess adhesive on the application head 76 is discharged to the collection container through the first discharge path 112, the inside of the holder 100 (i.e., the accommodation portion 91), and the second discharge path 114.

[0040] The second discharge path 114 is made of, for example, a non-metallic material. Specifically, the second discharge path 114 is a pipe made of a resin material, i.e., a resin pipe. The second discharge path 114 may be made of the same non-metallic material as the application head 76.

[0041] The steel plate holder 71 is disposed above the application head 76. When the laminated core 20 is manufactured, the steel plate holder 71 faces the upper surface of the strip steel plate M. In other words, the steel plate holder 71 is provided on the lower surface of the movable die 92. With the feed of the strip steel plate M temporarily stopped, the steel plate holder 71 is pressed downward by a hydraulic mechanism (not shown), thereby pressing the strip steel plate M downward. This allows the steel plate holder 71 to press down and position the height position of the strip steel plate M to the adhesive application position by the application head 76. In this positioned state, the lower surface of the strip steel plate M is close to each discharge port 77 of the application head 76.

[0042] Then, with the steel plate holder 71 positioned, the adhesive supply device 72 is started to supply an appropriate amount of air to the adhesive container, which sends the adhesive in the adhesive container to the application head 76. As a result, an appropriate amount of adhesive is discharged from each outlet 77 of the application head 76 and applied to the underside of the strip steel plate M. Thereafter, the steel plate holder 71 is raised to return the height position of the strip steel plate M to its original height.

[0043] The laminating unit 80 is a part of the manufacturing apparatus 30 that laminates the punched steel plate components 22 while bonding them with an adhesive. It is located downstream of the adhesive application unit 70. The laminating unit 80 includes a male outer periphery punching die 82, a female outer periphery punching die 84, a spring 86, and a heater 88.

[0044] The outer periphery punching male die 82 is a cylindrical die with a circular bottom surface, and the lower end of the spring 86 is connected to the upper end of the outer periphery punching male die 82. The outer periphery punching male die 82 is supported by the spring 86 and can move up and down together with the spring 86. The outer periphery punching male die 82 has an outer diameter that is approximately the same as the outer diameter of the laminated core 20.

[0045] The outer periphery punching female die 84 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 laminated core 20 .

[0046] The heater 88 is integrally incorporated into the outer periphery punching female die 84. The heater 88 heats the steel plate parts 22 stacked in the outer periphery punching female die 84 from the periphery. When a heat-curing adhesive is used, the adhesive cures when exposed to heat from the heater 88. On the other hand, when a room temperature curing adhesive is used, the adhesive cures at room temperature without the need for heating. When a room temperature curing adhesive is used, the heater 88 may be omitted.

[0047] According to the stacking unit 80, while the feeding of the strip steel sheet M is temporarily stopped, the outer periphery punching male die 82 is lowered to sandwich the strip steel sheet M between the outer periphery punching female die 84. Then, by pushing the outer periphery punching male die 82 into the outer periphery punching female die 84, the steel sheet part 22 whose periphery has been punched out is obtained from the strip steel sheet M.

[0048] The steel plate parts 22 punched out from the strip steel plate M are stacked on top of other steel plate parts 22 that have been punched out earlier and stacked and bonded inside the outer periphery punching female die 84. They are then subjected to pressure from the outer periphery punching male die 82 and heat from a heater 88. At this time, the pressure applied to the steel plate parts 22 from the outer periphery punching male die 82 is always kept constant by the biasing force of the spring 86. Note that the spring 86 may be omitted by appropriately setting the height position of the male die 82.

[0049] As a result, the steel plate part 22 punched this time is adhered to the upper surface of the steel plate part 22 punched previously. By repeating these steps of outer periphery punching, pressurizing, and heating the number of times equal to the number of stacked steel plate parts 22, a laminated core 20 is formed in the outer periphery punching female die 84. The fixed laminated core 20 is transferred to the lower side of the die through a through-hole (not shown in FIG. 2) formed in the fixed die 90 and ejected from the die.

[0050] As shown in FIG. 2, the female die 64 b , the female die 64 b , the application head 76 , the outer peripheral punching female die 84 , and the heater 88 are fixed on a fixed die 90 .

[0051] The male die 64 a, the male die 64 a, the steel plate holder 71 and the outer periphery punching male die 82 are fixed to the lower surface of the movable die 92 .

[0052] When the strip steel plate M is sent downstream and temporarily stopped, the movable die 92 is brought closer to the fixed die 90, i.e., lowered, thereby simultaneously punching out the outer periphery of the steel plate part 22, stacking and gluing, applying adhesive to the position of the steel plate part 22 on the strip steel plate M where the outer periphery will next be punched, applying a second punching process to the position on the strip steel plate M where the adhesive will next be applied, and punching out the first punching process to the position on the strip steel plate M where the second punching process will next be performed.

[0053] Next, the movable die 92 is raised and retracted above the steel strip M, after which the steel strip M is again fed downstream a predetermined distance and again temporarily stopped. In this state, the movable die 92 is lowered, and processing continues at each position. In this way, the laminated core 20 is manufactured by repeating the process of moving the movable die 92 up and down during temporary stops while intermittently feeding the steel strip M.

[0054] Next, the effects of this embodiment will be described. To bond punched steel sheet components together, an adhesive is applied to the steel sheet strip before punching. When adhesively bonding steel sheet components together, bonding the steel sheets together can take a long time, and if too much adhesive is applied, the adhesive can drip onto the edge of the steel sheet components. If too little adhesive is applied, the adhesive can lose adhesive strength. Furthermore, when using an anaerobic adhesive, the anaerobic adhesive reacts with the metal, and the hardening reaction progresses gradually even without the addition of a hardening accelerator. For this reason, depending on the punching speed of the steel sheet strip, it can be difficult to apply the appropriate amount of adhesive to the steel sheet strip. Additionally, the amount of adhesive applied is set to be large to ensure adhesive strength between the steel sheet components. Therefore, when applying adhesive to the steel sheet strip, excess adhesive is likely to be applied. If excess adhesive adheres to the mold and solidifies, it can clog the mold, or if the adhesive gets into the sliding parts, it can cause wear. In severe cases, it can cause problems such as chipping. Therefore, excess adhesive adhering to the molds needs to be removed promptly, and frequent maintenance is required. In contrast, in the manufacturing apparatus 30 of this embodiment, the discharge mechanism 110 discharges excess adhesive generated during application of adhesive to the steel strip M from the application head 76. Specifically, the excess adhesive on the application head 76 is discharged into a collection container via the first discharge path 112, the storage section 91, and the second discharge path 114. Even when excess adhesive is generated during application of adhesive to the steel strip M, the excess adhesive on the application head 76 is discharged into the collection container, thereby preventing the excess adhesive from adhering to the fixed mold 90 and the movable mold 92. This eliminates the need for frequent maintenance. In other words, it is possible to extend the maintenance cycle.

[0055] Furthermore, in the manufacturing apparatus 30, the outer peripheral surface 76a of the application head 76 contacts the side wall surface 91a of the accommodation portion 91, thereby restricting movement of the application head 76 in a direction intersecting the mold opening / closing direction. Therefore, in the manufacturing apparatus 30, compared to a configuration in which a gap is provided around (particularly the entire circumference of) the application head 76, for example, it is possible to discharge excess adhesive while suppressing shaking of the application head 76 relative to the fixed mold 90 due to vibrations that occur during operation. In particular, in the manufacturing apparatus 30, because most of the outer peripheral surface 76a of the application head 76 contacts the side wall surface 91a of the accommodation portion 91, it is possible to discharge excess adhesive while suppressing shaking of the application head 76 relative to the fixed mold 90 even at punching speeds of 100 spm or more.

[0056] In addition, in the manufacturing apparatus 30, the second discharge path 114 extends from the bottom surface of the storage section 91 toward the outside of the fixed mold 90, so that excess adhesive that accumulates in the storage section 91 can be efficiently discharged.

[0057] Furthermore, when components constituting the flow path for the anaerobic adhesive (e.g., piping, mold flow paths, etc.) are made of metal, the anaerobic adhesive reacts with the metal, and the curing reaction proceeds gradually even without the addition of a curing accelerator. As the curing reaction of the anaerobic adhesive proceeds, its fluidity decreases. In particular, when the flow path is narrow or in the bent portions of the piping or flow path, even a slight decrease in fluidity can cause clogging. In the manufacturing apparatus 30, by constructing the first discharge path 112 from a non-metallic material, the adhesive around the application head 76 can be quickly discharged, enabling the application of an appropriate amount of adhesive. Furthermore, by constructing the second discharge path 114 from a non-metallic material, clogging by the adhesive can be reduced, improving maintainability.

[0058] Furthermore, in the manufacturing apparatus 30, the components constituting the second discharge path 114 are made of non-metallic materials, so that the progress of the curing reaction of excess adhesive within the second discharge path 114 can be suppressed.

[0059] Furthermore, in the manufacturing apparatus 30, the portion that constitutes the first discharge path 112 is made of a non-metallic material, so that the progress of the curing reaction of excess adhesive within the first discharge path 112 can be suppressed.

[0060] Furthermore, in the manufacturing apparatus 30, a resin material is used as the non-metallic material. Resin material has excellent moldability, which makes it easy to mold the application head 76, the supply path 74, the first discharge path 112, the second discharge path 114, and the holder 100. Furthermore, the weight of the application head 76, the supply path 74, the first discharge path 112, the second discharge path 114, and the holder 100 can be reduced.

[0061] In addition, the resin material used in the manufacturing apparatus 30 is polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin, or polytetrafluoroethylene resin. These resin materials have excellent strength and chemical resistance (e.g., they are less likely to react with anaerobic adhesives). Therefore, the durability of components made from these resin materials is improved.

[0062] In the above-described embodiment, the portion of the coating head 76 that forms the first discharge path 112 is made of a non-metallic material, but the present disclosure is not limited to this. The portion of the coating head 76 that forms the first discharge path 112 may be made of a metallic material.

[0063] In the above-described embodiment, the entire applicator head 76 is made of a non-metallic material, but this disclosure is not limited to this. For example, only the portion of the applicator head that forms the adhesive flow path may be made of a non-metallic material.

[0064] The application head 76 may be formed by assembling a plurality of components. By forming the application head 76 in this manner as an assembly type, it is possible to replace only the components that have become clogged or deteriorated.

[0065] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope that does not deviate from the gist of the present disclosure.

[0066] The following additional notes are provided regarding the above-described embodiments.

[0067] <Supplementary Note 1> [1] A laminated core manufacturing device comprising: upper and lower dies that press a strip steel plate being fed downstream to punch out a core; a stacking section provided in the lower die that stacks the punched cores; an application section provided upstream of the stacking section of the lower die in the feeding direction of the strip steel plate that applies adhesive to the underside of the strip steel plate; and a discharge mechanism provided in the lower die that discharges excess adhesive from above the application section.

[0068] [2] The laminated core manufacturing device described in [1], wherein the discharge mechanism comprises: a first discharge path provided in the application section and discharging excess adhesive from above the application section; and a second discharge path provided in the lower mold, communicating with the first discharge path and discharging excess adhesive to the outside.

[0069] [3] The laminated core manufacturing device according to [2], wherein the application section is accommodated in a accommodating section provided in the lower mold, and the second discharge path extends from a bottom surface of the accommodating section toward the outside of the lower mold.

[0070] [4] The laminated core manufacturing device according to [2], wherein the portion of the coating unit that constitutes the first discharge passage is made of a non-metallic material.

[0071] [5] The laminated core manufacturing device according to [2], wherein the member constituting the second discharge passage is made of a non-metallic material.

[0072] [6] The laminated core manufacturing device according to [1], wherein the entire coating section is made of a non-metallic material.

[0073] [7] The laminated core manufacturing apparatus according to [4], wherein the non-metallic material is a resin material.

[0074] [8] The laminated core manufacturing device according to [7], wherein the resin material is polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin or polytetrafluoroethylene resin.

[0075] [9] The laminated core manufacturing device according to [2], wherein the portion of the coating unit that constitutes the first discharge passage is made of a metal material.

[0076]

[10] A method for manufacturing a laminated core, comprising: sending a strip steel plate toward an upper die and a lower die that press the strip steel plate to punch out steel plate parts; applying adhesive to the underside of the strip steel plate from an application section provided in the lower die; discharging excess adhesive from above the application section using a discharge mechanism provided in the lower die; and stacking cores punched out from the strip steel plate by pressing the upper die and the lower die while bonding them together with the adhesive.

[0077] <Supplementary Note 2> [[1]] A laminated core manufacturing device comprising: upper and lower dies that press a strip steel plate that is fed downstream to punch out a core; a stacking section that is provided in the lower die and stacks the punched cores; an application section that is provided upstream of the stacking section of the lower die in the feeding direction of the strip steel plate and applies adhesive to the underside of the strip steel plate, the application section contacting a restraining section provided in the lower die and restrained in its movement in a direction intersecting the die opening / closing direction; and a discharge mechanism that is provided in the lower die and discharges excess applied adhesive from above the application section.

[0078] [[2]] The discharge mechanism comprises: a first discharge path provided in the application section and discharging excess adhesive from above the application section; and a second discharge path provided in the lower mold, communicating with the first discharge path and discharging excess adhesive to the outside. The laminated core manufacturing device described in [[1]].

[0079] [[3]] The laminated core manufacturing device described in [[2]], wherein the coating unit has a coating head accommodated in a storage unit provided in the lower mold, and the restraint unit includes a side wall surface of the storage unit that contacts the outer peripheral surface of the coating head.

[0080] [[4]] The laminated core manufacturing device according to [[3]], wherein the second discharge passage extends from the bottom surface of the accommodating portion toward the outside of the lower mold.

[0081] [[5]] The laminated core manufacturing device described in any one of [[2]] to [[4]], wherein the portion of the application section that constitutes the first discharge path is made of a non-metallic material.

[0082] [[6]] The laminated core manufacturing device described in any one of [[2]] to [[5]], wherein the member constituting the second discharge passage is made of a non-metallic material.

[0083] [[7]] The laminated core manufacturing device described in any one of [[3]], [[4]], [[5]] citing [[3]], and [[6]] citing [[3]], wherein the entire coating head is made of a non-metallic material.

[0084] [[8]] The laminated core manufacturing device according to [[5]] or [[6]], wherein the non-metallic material is a resin material.

[0085] [[9]] The laminated core manufacturing device according to [[8]], wherein the resin material is a polyacetal resin, a polyethylene resin, a polypropylene resin, a polyether ether ketone resin, or a polytetrafluoroethylene resin.

[0086] [

[10] ] The laminated core manufacturing device according to [[2]], wherein a portion of the application unit that constitutes the first discharge passage is made of a metal material.

[0087] [

[11] ] A method for manufacturing a laminated core, comprising: sending a strip steel plate toward an upper mold and a lower mold that press the strip steel plate to punch out steel plate parts; applying adhesive to the underside of the strip steel plate from an application section provided in the lower mold, the application section contacting a restraint section provided in the lower mold and restrained in its movement in a direction intersecting the mold opening / closing direction; and discharging excess adhesive from above the application section using a discharge mechanism provided in the lower mold; and stacking cores punched out from the strip steel plate by pressing the upper mold and the lower mold while bonding them together with the adhesive.

[0088] The disclosure of Japanese Patent Application No. 2023-195402, filed on November 16, 2023, is incorporated herein by reference in its entirety.

[0089] All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference.

[0090] 20 Laminated core 22 Steel plate part 30 Manufacturing device 40 Delivery section 50 Oil application section 60 Press processing section 62 First punching section 64 Second punching section 70 Adhesive application section 72 Adhesive supply device 74 Supply path 76 Application head 80 Laminating section 90 Fixed mold 92 Movable mold 91 Storage section 110 Discharge mechanism 112 First discharge path 114 Second discharge path F Hoop material M Strip steel plate

Claims

1. An apparatus for manufacturing laminated cores comprising: upper and lower dies which press a strip steel sheet being sent out downstream to punch out a core; a lamination section provided in the lower die which stacks the punched cores; a coating section provided upstream of the lamination section of the lower die in the sending out direction of the strip steel sheet which applies adhesive to the underside of the strip steel sheet, the coating section being in contact with a restraint section provided in the lower die and restrained in its movement in a direction intersecting the die opening and closing direction; and a discharge mechanism provided in the lower die which discharges excess adhesive from above the coating section.

2. The laminated core manufacturing apparatus of claim 1, wherein the discharge mechanism comprises: a first discharge passage provided in the application section for discharging excess adhesive from above the application section; and a second discharge passage provided in the lower mold, communicating with the first discharge passage and discharging excess adhesive to the outside.

3. A laminated core manufacturing apparatus as described in claim 2, wherein the application section has a application head accommodated in a storage section provided in the lower mold, and the restraint section includes a side wall surface of the storage section that contacts the outer peripheral surface of the application head.

4. The laminated core manufacturing apparatus according to claim 3, wherein the second discharge passage extends from the bottom surface of the accommodating portion toward the outside of the lower mold.

5. The laminated core manufacturing device according to any one of claims 2 to 4, wherein the portion of the coating section that constitutes the first discharge passage is made of a non-metallic material.

6. The laminated core manufacturing device according to any one of claims 2 to 5, wherein the member constituting the second discharge passage is made of a non-metallic material.

7. The laminated core manufacturing apparatus according to any one of claims 3, 4, claim 5 which relies on claim 3, and claim 6 which relies on claim 3, wherein the entirety of said. is made of a nonmetallic material.

8. The laminated core manufacturing apparatus according to claim 5 or 6, wherein the non-metallic material is a resin material.

9. The laminated core manufacturing apparatus according to claim 8, wherein the resin material is a polyacetal resin, a polyethylene resin, a polypropylene resin, a polyether ether ketone resin or a polytetrafluoroethylene resin.

10. The laminated core manufacturing apparatus according to claim 2, wherein the portion of the coating section that constitutes the first discharge passage is made of a metal material.

11. A method for manufacturing a laminated core, comprising the steps of: sending a strip of steel sheet towards upper and lower dies which press the sheet to punch out steel plate parts; applying adhesive to the underside of the strip of steel sheet from an application section provided on the lower die which is in contact with a restraint section provided on the lower die and is restrained in its movement in a direction intersecting the die opening and closing direction; discharging excess adhesive from above the application section using a discharge mechanism provided on the lower die; and stacking cores punched out of the strip of steel sheet by pressing the upper and lower dies while bonding them with the adhesive.

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