Device for manufacturing laminated core and method for manufacturing laminated core

Abstract

This device for manufacturing a laminated core comprises: an upper die and a lower die for pressing a strip-form steel sheet being fed toward the downstream side to punch a steel sheet component; a lamination unit that is provided to the lower die and bonds and laminates the punched steel sheet component using an adhesive; and a coating unit that is provided on the upstream side from the lamination unit of the lower die or the upper die in the feeding direction of the strip-form steel sheet and applies the adhesive to one surface of the strip-form steel sheet. The coating unit has a plurality of discharge port units for continuously discharging the adhesive, and each of the discharge port units is configured from a non-metal material.

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] Anaerobic adhesives are used to bond punched steel sheet components together. These anaerobic adhesives have a high curing reaction with metals, and the curing reaction progresses gradually even without the addition of a curing accelerator or the like. Therefore, when a metal nozzle is used to apply the anaerobic adhesive, the anaerobic adhesive tends to harden inside the nozzle. When the anaerobic adhesive hardens, its fluidity decreases and the nozzle becomes clogged. Therefore, it is difficult to apply the appropriate amount of anaerobic adhesive to the strip steel sheet from which the steel sheet components are punched.

[0004] An object of the present disclosure is to provide a technology that enables an appropriate amount of adhesive to be applied to a steel strip.

[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 steel plate parts, a lamination section provided in the lower die that glues and stacks the punched steel plate parts with adhesive, and an application section provided upstream of the lamination section of the lower or upper die in the feeding direction of the strip steel plate that applies adhesive to one side of the strip steel plate, the application section having a plurality of discharge ports that continuously discharge the adhesive, and the portion that constitutes each of the discharge ports being made of a non-metallic material.

[0006] Another aspect of the manufacturing method for a laminated core of the present disclosure involves sending a strip of steel sheet toward an upper mold and a lower mold that press the sheet to punch out steel sheet parts, continuously ejecting adhesive from multiple outlets made of a non-metallic material provided in the lower mold or an application section provided in the upper mold to apply the adhesive to one side of the strip of steel sheet, and stacking the steel sheet parts punched out of the strip of steel sheet by pressing the upper and lower molds while bonding them together with the adhesive.

[0007] According to the present disclosure, it is possible to apply an appropriate amount of adhesive to a steel strip.

[0008] 6A ) and 6B ) are enlarged views of a state where adhesive is applied to a steel strip (enlarged views corresponding to FIG. 6A ). FIG. 7A ) and 7B are enlarged views of a state where adhesive is applied to a steel strip (enlarged views corresponding to FIG. 7A ). FIG. 7B ) and 7C are enlarged views of a state where adhesive is applied to a steel strip (enlarged views corresponding to FIG. 6A ). FIG. 7C ) and 7D are enlarged views of a state where adhesive is applied to a steel strip (enlarged views corresponding to FIG. 6A ). FIG. 7D ) and 7C are enlarged views of a state where adhesive is applied to a steel strip (enlarged views corresponding to FIG. 6A ).

[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). Note that the oil application unit 50 of this embodiment applies processing oil for press working to the strip steel sheet M. Also, each nozzle 52 of this embodiment faces downward to apply the oil. Therefore, the oil is applied to the top surface of the strip steel sheet M. Note that 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 of the strip steel sheet M. The adhesive application unit 70 includes an adhesive supply device 72, a supply path 74, an application head 76, and a steel sheet holder 71.

[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 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 is a part that coats adhesive on one side of the steel strip M. This coating head 76 is housed in a recessed housing portion 91 provided on the upper surface of the fixed mold 90. Note that the coating head 76 of this embodiment is an example of an coating portion in the present disclosure. Also, arrow A in Figures 3 to 6A and 6B indicates the flow of adhesive.

[0030] As shown in Figure 3, the application head 76 has a plurality of outlets 77 that discharge adhesive. The adhesive supply device 72 is configured to be able to continuously discharge adhesive from the plurality of outlets 77. Therefore, adhesive is continuously discharged from the plurality of outlets 77. Note that "continuously discharging adhesive from the outlets 77" here includes continuously discharging adhesive from the outlets 77 from the position where adhesive is applied to the steel strip M by the adhesive supply device 72 to at least the next adhesive application position.

[0031] 4, each discharge port 77 faces upward. That is, each discharge port 77 faces the lower surface of the steel strip M during the manufacture of the laminated core 20. In this embodiment, as shown in FIG. 6B, in a state in which the adhesive protrudes from the discharge port 77 (in other words, a state in which the adhesive is coming out upward from the discharge port 77), the discharge port 77 and the steel strip M are brought close to each other so as to leave a gap between them, and the adhesive is applied to the lower surface of the steel strip M.

[0032] The portions of the coating head 76 that form each discharge port 77 are made of a non-metallic material. The portions of the coating head 76 that form the discharge port 77 include an inner wall surface 77a that forms the discharge port 77, a peripheral portion 77b of the discharge port 77, and the like.

[0033] As shown in FIG. 4 , the application head 76 also has a storage section 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 storage section 78. The storage section 78 communicates with each discharge port 77. Therefore, the adhesive sent through the supply path 74 is discharged from each discharge port 77 via the storage section 78. The portion of the application head 76 that forms the storage section 78 is made of a non-metallic material. The portion of the application head 76 that forms the storage section 78 includes an inner wall surface 78a that forms the storage section 78 and an inner wall surface 78b of a flow path that connects the storage section 78 and the discharge port 77.

[0034] Furthermore, since the reservoir 78 is a portion for storing adhesive, no portion having a diameter smaller than that of the discharge port 77 is formed.

[0035] The application head 76 of this embodiment has a ring-shaped protrusion 79 that protrudes from the surface (the upper surface in FIG. 4 ). As an example, the protrusion 79 is annular. The top of the protrusion 79 is a flat surface that is flat in the circumferential direction (hereinafter referred to as the "top surface 79a" as appropriate). The top surface 79a of the protrusion 79 has a plurality of discharge ports 77 formed at intervals in the circumferential direction of the protrusion 79. In this embodiment, since the top of the protrusion 79 is a flat surface, the plurality of discharge ports 77 are formed on the flat surface. However, if the top of the protrusion 79 is a curved surface that curves along an arc in cross section, the discharge ports 77 are formed at the vertices of the curved surface.

[0036] In this embodiment, the entire application head 76 is made of a non-metallic material.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 .

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 .

[0048] 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 .

[0049] 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.

[0050] 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.

[0051] Next, the effects of this embodiment will be described. 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 a curing reaction gradually progresses even without the addition of a curing accelerator. As the curing reaction of the anaerobic adhesive progresses, its fluidity decreases. In particular, when the flow path is narrow or the piping or flow path is bent, even a slight decrease in fluidity can cause clogging. For example, when applying the anaerobic adhesive to a steel strip M using a needle-shaped metal nozzle, the anaerobic adhesive is likely to solidify within the metal nozzle. As the curing reaction of the anaerobic adhesive progresses within the metal nozzle, changes in viscosity occur, making it difficult to apply the appropriate amount of adhesive to the steel strip M over time. When punching steel sheet components 22 at a punching speed of 100 spm or more, the fluidity of the anaerobic adhesive decreases as the curing reaction progresses, making it even more difficult to apply the appropriate amount of adhesive to the steel strip M. In contrast, in the manufacturing apparatus 30 of this embodiment, the portion constituting the discharge port 77 of the application head 76 is made of a non-metallic material. In this embodiment, the discharge port 77 from which the adhesive is ejected is the portion with the narrowest diameter in the adhesive flow path. By constructing the portion constituting the discharge port 77 from a non-metallic material, it is possible to suppress the progress of the curing reaction of the adhesive within the discharge port 77. In addition, the portion constituting the storage section 78 that sends adhesive to the discharge port 77 in the application head 76 is also made of a non-metallic material. This makes it possible to suppress the progress of the curing reaction of the adhesive within the storage section 78. Furthermore, since the members constituting the supply path 74 are also made of a non-metallic material, it is possible to suppress the progress of the curing reaction of the adhesive within the supply path 74. By constructing the portion constituting the adhesive flow path from a non-metallic material in this manner, it is possible to suppress the progress of the curing reaction of the adhesive, thereby enabling an appropriate amount of adhesive to be applied to the strip-shaped steel sheet M. Furthermore, because the progress of the curing reaction of the adhesive can be suppressed, it is possible to apply an appropriate amount of adhesive to the strip-shaped steel sheet M even when the steel sheet component 22 is punched at a punching speed of 100 spm or more. Furthermore, since the progress of the curing reaction of the adhesive can be suppressed, maintenance of the application head 76 due to clogging becomes unnecessary for a long period of time.This improves maintainability.

[0052] 6B , in the manufacturing apparatus 30, with the adhesive protruding from the discharge port 77, the discharge port 77 and the steel strip M are brought close to each other so as to leave a gap between them, and the adhesive is applied to the underside of the steel strip. Here, if the discharge port 77 and the steel strip M are brought into contact with each other to apply the adhesive, there is a risk that the hardening reaction of the anaerobic adhesive in contact with the steel strip M will be accelerated. In contrast, in the manufacturing apparatus 30, a gap remains between the discharge port 77 and the steel strip M when the adhesive is applied, making it difficult for the hardening reaction of the anaerobic adhesive to be accelerated, and clogging of the discharge port 77 can be suppressed.

[0053] Furthermore, in the manufacturing apparatus 30, the entire coating head 76 is made of a non-metallic material, which makes it possible to more reliably suppress the progress of the curing reaction of the adhesive, compared to when only a portion of the coating head 76 is made of a metallic material.

[0054] Furthermore, in manufacturing apparatus 30, adhesive is sent to each outlet 77 via reservoir 78. Therefore, the flow path length from reservoir 78 to each outlet 77 is approximately constant, making it possible to discharge an appropriate amount of adhesive from each outlet.

[0055] 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 and the supply path 74. Furthermore, the weight of the application head 76 and the supply path 74 can be reduced.

[0056] 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, chemical resistance, etc. Therefore, the durability of members made of these resin materials is improved.

[0057] 7A and 7B may be used in place of the coating head 76 described above in the manufacturing apparatus 30. The coating head 100 has a pad 102 holding adhesive disposed within a discharge port 77. The surface of this pad 102 is preferably flush with the top surface 79a of the protrusion 79 or protrudes slightly from the top surface 79a. Because the adhesive protrudes from the surface of the pad 102, the adhesive can be applied to the steel strip M with a gap between the steel strip M and the pad 102. By disposing the pad 102 within the discharge port 77 in this way, it becomes easier to apply an appropriate amount of adhesive to the steel strip M.

[0058] In the manufacturing apparatus 30, a coating head 110 shown in FIG. 8 may be used instead of the coating head 76 described above. The coating head 110 has a notch 112 (e.g., a slit) formed in the top surface 79a of the protruding portion 79 so as to cross the discharge port 77. Specifically, the notch 112 crosses the discharge port 77 in the radial direction of the protruding portion 79. By forming such a notch 112, excess adhesive S can be allowed to escape through the notch 112 to the radially inner or outer side of the protruding portion 79. This makes it easier to apply an appropriate amount of adhesive to the strip steel sheet M.

[0059] The application head 76 may be formed by assembling multiple components. By constructing the application head 76 in this manner as an assembly type, it is possible to replace only clogged or deteriorated components. Furthermore, for example, the upper and lower surfaces of the inner wall surface 78a of the storage portion 78 may be formed from separate components, and the upper and lower surfaces of the storage portion 78 may be subjected to porcelain enamel treatment, DLC (diamond-like carbon) treatment, or resin coating (resin application, insert molding), thereby enabling the base bodies of the separate components to be formed from a metal material.

[0060] In the manufacturing apparatus 30, the adhesive is applied to the lower surface of the steel strip M by the adhesive application unit 70, but the present disclosure is not limited to this configuration. For example, the adhesive application unit 70 may be provided on the lower surface of the movable mold 92, and the adhesive may be applied to the upper surface of the steel strip M.

[0061] 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.

[0062] The following additional notes are provided regarding the above-described embodiments.

[0063] <Supplementary Note 1> [1] A laminated core manufacturing device comprising: an upper die and a lower die that press a strip steel plate that is fed downstream to punch out steel plate parts; a lamination section that is provided in the lower die and that adheres and laminates the punched steel plate parts with an adhesive; and an application section that is provided upstream of the lamination section of the lower die or the upper die in the feeding direction of the strip steel plate and that applies adhesive to one side of the strip steel plate, wherein the application section has a plurality of discharge ports that discharge the adhesive, and a portion that constitutes each of the discharge ports is made of a non-metallic material.

[0064] [2] The laminated core manufacturing device according to [1], wherein the application unit has a storage unit that stores the adhesive supplied from an external source, and the adhesive is sent from the storage unit to each of the discharge ports.

[0065] [3] The laminated core manufacturing device according to [2], wherein the portion of the application section that constitutes the reservoir section is made of a non-metallic material.

[0066] [4] The laminated core manufacturing device according to [1], wherein the entire coating section is made of a non-metallic material.

[0067] [5] The laminated core manufacturing device according to [1], wherein a pad into which the adhesive is soaked is disposed within each of the discharge ports.

[0068] [6] The laminated core manufacturing apparatus according to [1], wherein the non-metallic material is a resin material.

[0069] [7] The laminated core manufacturing device according to [6], wherein the resin material is polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin or polytetrafluoroethylene resin.

[0070] [8] A method for manufacturing a laminated core, comprising: sending a strip of steel sheet toward an upper mold and a lower mold that press the strip of steel sheet to punch out steel sheet parts; discharging adhesive from a plurality of outlets made of a non-metallic material provided in the lower mold or an application section provided in the upper mold to apply the adhesive to one side of the strip of steel sheet; and stacking the steel sheet parts punched out from the strip of steel sheet by pressing the upper mold and the lower mold while bonding them with the adhesive.

[0071] <Supplementary Note 2> [[1]] A laminated core manufacturing device comprising: an upper die and a lower die that press a strip steel plate that is fed downstream to punch out steel plate parts; a lamination section that is provided in the lower die and that adheres and laminates the punched steel plate parts with an adhesive; and an application section that is provided upstream of the lamination section of the lower die or the upper die in the feeding direction of the strip steel plate and that applies adhesive to one side of the strip steel plate, wherein the application section has a plurality of discharge ports that continuously discharge the adhesive, and a portion that constitutes each of the discharge ports is made of a non-metallic material.

[0072] [[2]] The laminated core manufacturing device described in [[1]], wherein the application unit has a storage unit that stores the adhesive supplied from an external source, and the adhesive is sent from the storage unit to each of the discharge ports.

[0073] [[3]] The laminated core manufacturing device according to [[2]], wherein the portion of the application section that constitutes the reservoir section is made of a non-metallic material.

[0074] [[4]] The laminated core manufacturing device according to any one of [[1]] to [[3]], wherein the entire coating section is made of a non-metallic material.

[0075] [[5]] A laminated core manufacturing device according to any one of [[1]] to [[4]], wherein a pad holding the adhesive is disposed within each of the discharge ports.

[0076] [[6]] The laminated core manufacturing device according to any one of [[1]] to [[5]], wherein the non-metallic material is a resin material.

[0077] [[7]] The laminated core manufacturing device according to [[6]], wherein the resin material is polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin or polytetrafluoroethylene resin.

[0078] [[8]] The laminated core manufacturing device described in any one of [[1]] to [[7]], wherein the coating unit has a coating head provided with an annular protrusion, and each of the discharge ports is provided at the top of the protrusion.

[0079] [[9]] A method for manufacturing a laminated core, comprising: sending a strip of steel sheet toward an upper mold and a lower mold that press the strip of steel sheet to punch out steel sheet parts; continuously ejecting adhesive from a plurality of ejection ports made of a non-metallic material provided in the lower mold or an application section provided in the upper mold to apply the adhesive to one side of the strip of steel sheet; and stacking the steel sheet parts punched out from the strip of steel sheet by pressing the upper mold and the lower mold while bonding them with the adhesive.

[0080] The disclosure of Japanese Patent Application No. 2023-195401, filed on November 16, 2023, is incorporated herein by reference in its entirety.

[0081] 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.

[0082] 20 Laminated core 22 Steel plate part 30 Manufacturing device 40 Feeding 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 100 Application head 102 Pad 110 Application head 112 Notch F Hoop material M Strip steel plate

Claims

1. An apparatus for manufacturing laminated cores, comprising: upper and lower dies that press a strip steel plate sent out downstream to punch out steel plate parts; a lamination section provided in the lower die that bonds and laminates the punched steel plate parts with an adhesive; and an application section provided upstream of the lamination section of the lower or upper die in the sending-out direction of the strip steel plate, which applies adhesive to one side of the strip steel plate, wherein the application section has a plurality of discharge ports that continuously discharge the adhesive, and a portion that constitutes each of the discharge ports is made of a non-metallic material.

2. The laminated core manufacturing device according to claim 1, wherein the application section has a storage section for storing the adhesive supplied from outside, and the adhesive is sent from the storage section to each of the discharge ports.

3. The laminated core manufacturing apparatus according to claim 2, wherein the portion of the coating section that constitutes the reservoir section is made of a non-metallic material.

4. The laminated core manufacturing apparatus according to any one of claims 1 to 3, wherein the entire coating section is made of a non-metallic material.

5. A laminated core manufacturing device as claimed in any one of claims 1 to 4, wherein a pad holding the adhesive is disposed within each of the discharge ports.

6. The laminated core manufacturing apparatus according to any one of claims 1 to 5, wherein the non-metallic material is a resin material.

7. The laminated core manufacturing apparatus according to claim 6, wherein the resin material is polyacetal resin, polyethylene resin, polypropylene resin, polyether ether ketone resin or polytetrafluoroethylene resin.

8. A laminated core manufacturing device as described in any one of claims 1 to 7, wherein the coating section has a coating head provided with an annular protrusion, and each of the discharge ports is provided at the top of the protrusion.

9. 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; continuously ejecting adhesive from a plurality of outlets made of a non-metallic material provided in the lower die or an application section provided in the upper die to apply the adhesive to one side of the strip of steel sheet; and stacking the steel plate parts punched out of the strip of steel sheet by pressing the upper and lower dies while adhering them with the adhesive.

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