Manufacturing method and manufacturing device for laminated core

Abstract

A manufacturing device 1 for a laminated core 4 is for manufacturing a laminated core 4 in which core plates 3 of a prescribed shape are formed by being punched out from a steel plate and a prescribed number of the core plates 3 are laminated and bonded, the manufacturing device 1 for the laminated core 4 comprising: an adhesive application device for applying an adhesive to a site of the steel plate corresponding to the core plates 3; a die constituted of a die that includes an upper metal mold and a lower metal mold 131 and is for punching out the core plates 3 from the steel plate after application of the adhesive by the adhesive application device; a lamination unit 16 for laminating and bonding the core plates 3 punched out from the steel plate by the die; and a heating device 20 for heating the core plates 3 laminated by the lamination unit 16. The lamination unit 16 includes a support base 167 that receives the core plates 3 and descends as the number of the received core plates 3 increases. The heating device 20 is provided to the support base 167.

Description

Manufacturing Apparatus and Method for Laminated Core

[0001] The present invention relates to a manufacturing apparatus and method for a laminated core for manufacturing a laminated core in which a core plate having a predetermined shape is punched out from a steel plate and a predetermined number of core plates are laminated and bonded.

[0002] For cores or iron cores used in rotating electrical machines, laminated cores in which a predetermined number of core plates are laminated are used. The core plates are joined to each other by various methods. When caulking and welding are used as joining methods, the magnetic properties of the laminated core may deteriorate due to mechanical stress or thermal stress during joining and interlayer short-circuiting, and the performance of the laminated core may not be fully exhibited. For this reason, as shown in Patent Document 1 below, etc., attempts have been made to laminate and bond the core plates.

[0003] Patent Document 1 describes a manufacturing apparatus for a laminated core, which has an upper die and a lower die, a progressive die means for sequentially punching out core plates from a strip-shaped thin steel plate that is intermittently transferred, and an adhesive application device incorporated in the lower die for applying an adhesive to a portion corresponding to the core plate of the strip-shaped thin steel plate. Patent Document 1 describes that after the core plates are punched out from the steel plate, the core plates are laminated and bonded to form a group of core plates, and the group of core plates is heated by a heating device to cure the adhesive between the core plates. In Patent Document 1, it is shown that a heating device is incorporated in the lower die at the lower part of a squeezing ring into which the core plates are sequentially pushed (see the first heating device in FIG. 3 of Patent Document 1).

[0004] Japanese Patent Application Laid-Open No. 2017-216873

[0005] In the conventional configuration disclosed in Patent Document 1, since the heating device is incorporated in the lower die, the lower die may expand due to the heat of the heating device, and there is a risk that the punching accuracy of the core plate may decrease.

[0006] The present invention has been made to solve the above problems, and one of its objects is to provide a manufacturing apparatus and method for a laminated core that can reduce the risk of deterioration in the punching accuracy of the core plate due to heating of the core plate.

[0007] In one embodiment, the laminated core manufacturing apparatus according to the present invention is a laminated core manufacturing apparatus for punching out core plates from a steel sheet and manufacturing a laminated core using the core plates, comprising: an adhesive application apparatus for applying adhesive to the portion of the steel sheet corresponding to the core plate; a die including an upper die and a lower die for punching out the core plate from the steel sheet after the adhesive is applied by the adhesive application apparatus; a lamination section for laminating and bonding the core plates punched out from the steel sheet by the die; and a heating apparatus for heating the laminated core plates in the lamination section, wherein the lamination section includes a support base that receives the core plates and lowers as the number of receiving core plates increases, and the heating apparatus is provided on the support base.

[0008] In one embodiment, the method for manufacturing a laminated iron core according to the present invention includes manufacturing a laminated iron core using the above-described laminated iron core manufacturing apparatus.

[0009] According to one embodiment of the manufacturing apparatus and manufacturing method for laminated iron cores of the present invention, since the heating device is provided on the support base, the risk of a decrease in the punching accuracy of the iron core plate due to heating of the iron core plate can be reduced.

[0010] This is an explanatory diagram showing a laminated core manufacturing apparatus according to Embodiment 1 of the present invention. This is an explanatory diagram showing the laminated section of Figure 1 in more detail. This is an explanatory diagram showing the configuration around the laminated section of Figure 2 in more detail. This is a plan view showing the support base of Figure 3. This is an explanatory diagram showing the configuration around the laminated section of the laminated core manufacturing apparatus according to Embodiment 2 of the present invention. This is a plan view showing the support base of Figure 5. This is an explanatory diagram showing the configuration around the laminated section of the laminated core manufacturing apparatus according to Embodiment 3 of the present invention.

[0011] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to each embodiment, and can be materialized by modifying the components without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in each embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components from different embodiments may be appropriately combined.

[0012] Embodiment 1. Figure 1 is an explanatory diagram showing a manufacturing apparatus 1 for laminated iron core 4 according to Embodiment 1 of the present invention. The manufacturing apparatus 1 shown in Figure 1 is an apparatus for manufacturing laminated iron core 4 by punching out iron core plates 3 of a predetermined shape from a steel plate 2 and laminating and bonding a predetermined number of iron core plates 3.

[0013] As shown in Figure 1, the manufacturing apparatus 1 of this embodiment includes a reel 10, a feeding device 11, an oiling device 12, and a press machine 13. A coil of steel sheet 2 is mounted on the reel 10. The steel sheet 2 drawn from the reel 10 is sent to the press machine 13 through the feeding device 11. The oiling device 12 is positioned between the feeding device 11 and the press machine 13 and supplies press oil to the surface of the steel sheet 2 before it is introduced into the press machine 13. The press machine 13 includes an upper die 130 and a lower die 131, which punch out the iron core plate 3 from the steel sheet 2.

[0014] The manufacturing apparatus 1 of this embodiment includes an adhesive application device 14, a mold 15, and a lamination section 16.

[0015] The adhesive application device 14 applies adhesive to the portion of the steel plate 2 corresponding to the core plate 3. The adhesive application device 14 may be built into the lower die 131 and may apply adhesive to the lower surface of the steel plate 2. A liquid supply device 140 is connected to the adhesive application device 14, and the adhesive application device 14 applies adhesive from the liquid supply device 140.

[0016] The die 15 punches out the core plate 3 from the steel plate 2. The die 15 includes an upper die 130 and a lower die 131. The punching of the steel plate 2 by the die 15 is carried out in multiple stages. That is, the steel plate 2 is punched out sequentially in the feeding direction of the steel plate 2 toward the final core plate 3. The punching of the steel plate 2 by the die 15 includes a pre-processing step in which the parts of the steel plate 2 other than the outer shape (other than the outer circumference) of the core plate 3 are punched out, and an outer shape punching step which punches out the outer shape of the core plate 3 from the steel plate 2 after the pre-processing step. The outer shape punching is performed last, and the core plate 3 is punched out of the steel plate 2 when the outer shape of the core plate 3 is punched out.

[0017] The adhesive is applied by the adhesive application device 14 before the core plate 3 is finally punched out from the steel plate 2, that is, when pre-processing is performed or before the outer shape punching is performed. In other words, the punching of the core plate 3 from the steel plate 2 by the die 15 is performed after the adhesive is applied by the adhesive application device 14. The adhesive may also be applied, for example, before the steel plate 2 is introduced into the press equipment 13.

[0018] The lamination section 16 is a part for laminating and bonding the iron core plates 3 punched out from the steel sheet 2 by the die 15. The iron core plates 3, with adhesive applied, are laminated in the lamination section 16. The lamination section 16 may be built into the lower die 131 at the position where the outer shape punching is performed by the die 15. The iron core plate 3 is dropped onto the iron core plate 3 that has been punched out earlier, and is bonded to the upper surface of the iron core plate 3 that has been punched out earlier by the weight of the iron core plate 3 itself or the subsequent iron core plate 3, and the pressure from the upper die 130. The upper die 130 may be provided with a projection that pushes down and applies pressure to the iron core plates 3 of the lamination section 16 by the thickness of one iron core plate 3.

[0019] As will be explained later using diagrams, a predetermined number of core plates 3 are heated in the laminated section 16, and the adhesive between the core plates 3 hardens, thereby forming the laminated core 4 (see Figure 3).

[0020] Next, Figure 2 is an explanatory diagram showing the laminated portion 16 of Figure 1 in more detail. As shown in Figure 2, the laminated portion 16 includes a squeeze ring 160, a brake 161, a cylinder 162, a piston 163, a rod 164, a support 165, a support shaft portion 166, a support 167, a biasing member 168, and a sensor 169.

[0021] The squeeze ring 160 is a cylindrical member. When the outer shape of the core plate 3 is circular or nearly circular, the squeeze ring 160 is cylindrical. The core plate 3, punched out from the steel plate 2 by the die 15, is dropped into the inside of the squeeze ring 160. The inner diameter of the squeeze ring 160 gradually narrows towards the bottom, adjusting the position of the core plate 3 within the squeeze ring 160. The brake 161 applies lateral pressure to the core plate 3 as it exits the lower end of the squeeze ring 160, controlling its fall. The brake 161 may be configured to apply lateral pressure by pressing a block-shaped member, such as a spring, against the side of the core plate 3 as it exits the lower end of the squeeze ring 160. At the stage when it passes through the brake 161, the adhesive between the core plates 3 is not completely hardened, but the core plates 3 are stuck together.

[0022] The cylinder 162 is a housing into which an operating fluid 162a, such as oil or compressed air, is supplied. The piston 163 is located inside the cylinder 162, dividing the inside of the cylinder 162 into a first space S1 and a second space S2. The rod 164 is provided integrally with the piston 163. The rod 164 moves up and down due to the internal pressure difference between the first space S1 and the second space S2. The cylinder 162 is connected to a first pipe P1 that communicates with the first space S1 and a second pipe P2 that communicates with the second space S2. A control valve CV is provided in the first pipe P1. The supply of the operating fluid 162a to the first space S1 is controlled by the control valve CV.

[0023] The support 165 is a cylindrical member through which a support shaft 166 is inserted so as to be able to move back and forth, and is attached to the end of the rod 164. The support base 167 is a plate-shaped member attached to the end of the support shaft 166. The biasing member 168 is positioned between the upper surface of the support 165 and the lower surface of the support base 167, and supports the support base 167 such that a gap is formed between the lower end 166a of the support shaft 166 and the upper end 164a of the rod 164. The biasing member 168 may be made of, for example, a spring, an air cylinder, or rubber.

[0024] The sensor 169 is composed of, for example, a pressure sensor or a proximity sensor, and is provided on the upper end 164a of the rod 164. The sensor 169 detects when the lower end 166a of the support shaft portion 166 contacts or comes close to the upper end 164a of the rod 164, overcoming the biasing force of the biasing member 168.

[0025] Figure 2(a) shows the state in which the support base 167 has been lowered and separated from the core plate 3 held by the squeeze ring 160 and brake 161. At this time, the working fluid 162a is supplied to the first space S1, and the support base 167 rises together with the piston 163, rod 164, support body 165, support base shaft portion 166, biasing member 168 and sensor 169. As a result, as shown in Figure 2(b), the upper surface of the support base 167 comes into contact with the lower surface of the core plate 3.

[0026] As shown in Figure 2(b), when the support base 167 is raised further from the state where its upper surface is in contact with the lower surface of the core plate 3, the sensor 169 detects that the lower end 166a of the support base shaft portion 166 has overcome the biasing force of the biasing member 168 and is in contact with or close to the upper end 164a of the rod 164. At this time, the working fluid 162a is discharged from the first space S1, and the internal pressure of the first space S1 is gradually reduced. In response to the decrease in internal pressure of the first space S1, the support base 167 descends together with the piston 163, rod 164, support 165, support base shaft portion 166, biasing member 168, and sensor 169, as shown in Figure 2(c).

[0027] From (b) to (c) in Figure 2, the support base 167 supports the iron core plates 3 and descends as the number of iron core plates 3 being supported increases. The descent speed of the support base 167 can be controlled by the opening of the control valve CV, i.e., the rate at which the internal pressure of the first space S1 is reduced. As the support base 167 descends, the previously stacked iron core plates 3 and the subsequent stacked iron core plates 3 are separated. The brake 161 holds the subsequent stacked iron core plates 3.

[0028] Next, Figure 3 is an explanatory diagram showing in more detail the configuration around the laminated section 16 in Figure 2, and Figure 4 is a plan view showing the support base 167 in Figure 3. The manufacturing apparatus 1 of this embodiment includes a heating device 20 for heating the iron core plates 3 laminated in the laminated section 16. By heating the iron core plates 3 with the heating device 20, the adhesive between the iron core plates 3 is hardened. As shown in Figure 3, in the manufacturing apparatus 1 of this embodiment, the heating device 20 is provided on the support base 167.

[0029] If the heating device 20 were to be incorporated into the lower mold 131, the heat from the heating device 20 would cause the lower mold 131 to expand, potentially reducing the punching accuracy of the core plate 3. On the other hand, although the support stand 167 is located inside the lower mold 131, a space S3 is provided around the support stand 167 for its movement up and down. Therefore, by providing the heating device 20 on the support stand 167, as in the manufacturing apparatus 1 of this embodiment, heat transfer from the heating device 20 to the lower mold 131 can be suppressed, reducing the risk of reduced punching accuracy of the core plate 3 due to heating of the core plate 3.

[0030] The lower mold 131 is provided with a vertically extending elevator shaft 1310 (through hole). The support base 167 is configured to move up and down within the elevator shaft 1310. The space S3 is formed between the outer edge of the support base 167 and the inner surface 1310a of the elevator shaft 1310 when viewed in plan. When viewed in plan, the heating device 20 may be located within the range of the support base 167.

[0031] While not limited to this, the shortest distance between the inner surface 1310a of the lifting passage 1310 of the support base 167 provided on the lower mold 131 and the support base 167 is preferably 1 mm or more and 5 mm or less. A shortest distance of 1 mm or more allows for more reliable suppression of heat transfer from the heating device 20 to the lower mold 131. The temperature of the heating device 20 is not high enough to require consideration of radiation, and it is considered sufficient that the heating device 20 does not come into contact with the lower mold 131 via the support base 167. A shortest distance of 5 mm or less reduces the risk of the manufacturing apparatus 1 becoming unnecessarily large.

[0032] The support base 167 of this embodiment further includes a support base body 30 that receives the iron core plates 3, and a guide 40 that extends upward from the support base body 30. As is particularly shown in Figure 4, the guide 40 is positioned so that the sides 3s of the iron core plates 3 are aligned when the iron core plates 3 are stacked along the guide 40. In this embodiment, a heating device 20 is provided on the guide 40. The guide 40 is in contact with the sides 3s of the stacked iron core plates 3, and by providing the heating device 20 on the guide 40, the iron core plates 3 can be heated more effectively.

[0033] Examples of heating devices 20 installed in the guide 40 include electric heaters. The guide 40 is a block processed so that its side surface is in contact with the iron core plate 3, and the heating device 20 can be incorporated into this block. The heating device 20 may be visible on the outer surface of the guide 40 or may be embedded in the guide 40.

[0034] Figure 4 shows an annular core plate 3 in plan view. An arc-shaped side surface 40a corresponding to the side surface 3s of this annular core plate 3 is provided on the guide 40. However, the shape of the core plate 3 can be arbitrarily changed, and the shape of the side surface of the guide 40 can also be arbitrarily changed according to the shape of the core plate 3.

[0035] Although Figure 2 describes the case without the guide 40, when the guide 40 is provided on the support body 30 as in this embodiment, when the support 167 is raised further from the state in which the guide 40 is in contact with the lower surface of the squeeze ring 160, the sensor 169 may detect that the lower end 166a of the support shaft portion 166 has overcome the biasing force of the biasing member 168 and has come into contact with or come close to the upper end 164a of the rod 164.

[0036] The laminated core 4 is formed on the support base 167. More specifically, the laminated core 4 is formed when a predetermined number of core plates 3 are stacked on the support base 167 and the adhesive between the core plates 3 hardens due to heating by the heating device 20. The manufacturing apparatus 1 of this embodiment further includes a pusher 50. The pusher 50 is positioned to the side of the laminated core 4 on the support base 167 and pushes the laminated core 4 from the support base 167 by pushing it from the side. The pusher 50 includes an operating pin 50a and a pusher body 50b. The operating pin 50a is a rod-shaped member. The pusher body 50b slides the operating pin 50a in the axial direction of the operating pin 50a. The pusher body 50b can be operated, for example, by electric or hydraulic power. As shown in Figure 4, the guide 40 is positioned so as to be in contact with the side surface of the laminated core 4 on the pusher 50 side when the laminated core 4 on the support base 167 is viewed in plan, and includes a gap or opening 40b that allows the operating pin 50a of the pusher 50 to pass through. In Figure 4, the operating pin 50a is provided to be displaceable in the left-right direction. When the operating pin 50a is displaced to the right in the figure, the laminated core 4 is fed out from the support base 167. This configuration makes it possible to avoid interference between the guide 40 and the pusher 50.

[0037] Furthermore, the side surface of the laminated core 4 on the pusher 50 side can be understood as the side surface located on the pusher 50 side when the laminated core 4 is viewed in plan, as shown in Figure 4, and is located on the pusher 50 side of a straight line L1 that passes through the center point C of the laminated core 4 and is perpendicular to the direction of movement of the operating pin 50a. The guide 40 is positioned to contact at least a portion of the side surface of the laminated core 4 on the pusher 50 side. In the illustrated embodiment, the guide 40 is positioned to contact the entire surface of the side surface of the laminated core 4 on the pusher 50 side, except for any gaps or openings 40b.

[0038] Embodiment 2. Figure 5 is an explanatory diagram showing the configuration around the laminated section 16 of the manufacturing apparatus 1 for the laminated iron core 4 according to Embodiment 2 of the present invention, and Figure 6 is a plan view showing the support base 167 of Figure 5. In Embodiment 1, the heating device 20 was described as being provided on the guide 40 on the support base 167. However, the heating device 20 may be provided at other locations on the support base 167.

[0039] As shown in Figures 5 and 6, in the manufacturing apparatus 1 of this embodiment 2, the support base 167 includes a support surface 60 on which the iron core plate 3 is placed. In addition, in the manufacturing apparatus 1 of this embodiment 2, a heating device 20 is provided on the support surface 60. By providing the heating device 20 on the support surface 60, the iron core plate 3 can be heated while reducing the risk of the punching accuracy of the iron core plate 3 decreasing due to heating of the iron core plate 3.

[0040] Examples of heating devices 20 provided on the receiving surface 60 include a structure in which an electric heater is attached to a thin metal plate. The heating device 20 can be attached to the receiving surface 60 with multiple bolts with a small gap between them. The planar shape of the heating device 20 may be the same as the planar shape of the core plate 3, and the core plate 3 may be placed on the heating device 20. The receiving surface 60 may be larger than the heating device 20 and the core plate 3, and bolts may be placed in the empty space when the core plate 3 is placed on the receiving surface 60. The other configurations are the same as in Embodiment 1.

[0041] Embodiment 3. Figure 7 is an explanatory diagram showing the configuration around the laminated section 16 of the manufacturing apparatus 1 for the laminated iron core 4 according to Embodiment 3 of the present invention. In Embodiment 1, it was explained that the temperature of the heating device 20 is not high enough to require consideration of radiation, but an insulating material 70 may be added to consider the case where radiation from the heating device 20 is received for a long period of time. In the configuration shown in Figure 7, an insulating material 70 is added to the inner surface of the lifting passage of the support base 167 provided on the lower mold 131. The insulating material 70 may be provided around the entire circumference of the support base 167 so as to surround the support base 167. The configuration shown in Figure 7 adds an insulating material 70 to the configuration of Embodiment 2, but an insulating material 70 may also be added to the configuration of Embodiment 1. Alternatively, the insulating material 70 may be placed on the support base 167 so as to be located between the heating device 20 and the lower mold 131. The other configurations are the same as in Embodiments 1 and 2.

[0042] A method for manufacturing a laminated core 4 according to an embodiment of the present invention includes manufacturing the laminated core 4 using the laminated core 4 manufacturing apparatus 1 described in Embodiments 1 to 3.

[0043] In other words, the method for manufacturing the laminated core 4 according to the embodiment of the present invention is a manufacturing apparatus for manufacturing the laminated core 4 by punching out the core plate 3 from the steel sheet 2 and using the core plate 3 to manufacture the laminated core 4, including a step of applying an adhesive to a portion of the steel sheet 2 corresponding to the core plate 3 by the adhesive application device 14, a step of punching out the core plate 3 from the steel sheet 2 by the mold 15 including the upper mold 130 and the lower mold 131 after the application of the adhesive by the adhesive application device 14, a step of laminating and bonding the core plates 3 punched out from the steel sheet 2 by the mold 15 in the lamination part 16, and a step of heating the core plates 3 laminated in the lamination part 16 by the heating device 20. The lamination part 16 includes a receiving base 60 that receives the core plates 3 and descends as the number of the received core plates 3 increases. The heating device 20 is provided on the receiving base 60. The rest is as described above.

[0044] As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the present invention is not limited to such examples. It is obvious that those having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims. Naturally, these are also understood to belong to the technical scope of the present invention.

[0045] The invention described herein may also be described as follows: [1] A laminated core manufacturing apparatus for producing a laminated core in which a predetermined number of core plates are laminated and bonded together, wherein the apparatus comprises: an adhesive application device for applying adhesive to a portion of the steel plate corresponding to the core plate; a die including an upper die and a lower die for punching out the core plate from the steel plate after the adhesive has been applied by the adhesive application device; a lamination section for laminating and bonding the core plates punched out from the steel plate by the die; and a heating device for heating the core plates laminated in the lamination section, wherein the lamination section includes a support base that receives the core plates and lowers as the number of receiving core plates increases, and the heating device is provided on the support base. [2] The support further includes a support body for receiving the core plates and a guide extending upward from the support body, the guide being positioned such that the sides of the core plates are aligned when the core plates are stacked along the guide, and the heating device is provided on the guide, the laminated core manufacturing apparatus according to paragraph 1. [3] The laminated core is formed on the support, and further includes a pusher positioned to the side of the laminated core on the support, which pushes the laminated core from the support by pushing it from the side, the pusher including an operating pin and a pusher body for sliding the operating pin, the guide being positioned so as to be in contact with the side of the laminated core on the pusher side when the laminated core on the support is viewed in plan, and includes a gap or opening that allows the operating pin to pass through, the laminated core manufacturing apparatus according to paragraph 2. [4] The apparatus for manufacturing a laminated iron core according to paragraph 1, wherein the support base includes a receiving surface on which the iron core plate is placed, and the heating device is provided on the receiving surface. [5] A method for manufacturing a laminated iron core, comprising manufacturing the laminated iron core using the apparatus for manufacturing a laminated iron core according to any one of paragraphs 1 to 4.

[0046] 1: Manufacturing equipment 2: Steel plate 3: Iron core plate 3s: Side surface 4: Laminated iron core 14: Adhesive application device 15: Mold 16: Laminated section 20: Heating device 30: Support base body 40: Guide 40b: Opening 50: Pusher 50a: Operating pin 60: Receiving surface 130: Upper mold 131: Lower mold 167: Support base

Claims

1. A laminated core manufacturing apparatus for punching out core plates from a steel plate and manufacturing a laminated core using the core plates, comprising: an adhesive application device for applying adhesive to the portion of the steel plate corresponding to the core plates; a die including an upper die and a lower die for punching out the core plates from the steel plate after the adhesive has been applied by the adhesive application device; a lamination section for laminating and bonding the core plates punched out from the steel plate by the die; and a heating device for heating the core plates laminated in the lamination section, wherein the lamination section includes a support base that receives the core plates and lowers as the number of receiving core plates increases, and the heating device is provided on the support base.

2. The support further includes a support body for receiving the core plates and a guide extending upward from the support body, the guide being positioned such that the sides of the core plates are aligned when the core plates are stacked along the guide, and the heating device is provided on the guide, the apparatus for manufacturing laminated cores according to claim 1.

3. The apparatus for manufacturing a laminated core according to claim 2, wherein the laminated core is formed on the support base, and further comprises a pusher positioned laterally to the laminated core on the support base, which pushes the laminated core from the support base to send it out of the support base, the pusher comprising an operating pin and a pusher body for sliding the operating pin, and the guide being positioned so as to be in contact with the side surface of the laminated core on the pusher side when the laminated core on the support base is viewed in plan, and includes a gap or opening that allows the operating pin to pass through.

4. The support base includes a receiving surface on which the iron core plate is placed, and the heating device is provided on the receiving surface, the apparatus for manufacturing laminated iron cores according to claim 1.

5. A method for manufacturing a laminated iron core, comprising manufacturing the laminated iron core using a laminated iron core manufacturing apparatus described in any one of claims 1 to 4.

Images