Manufacturing apparatus of laminated iron core

Abstract

To provide a manufacturing apparatus of a laminated iron core capable of manufacturing the laminated iron core in a short time while suppressing increase in size of the apparatus.SOLUTION: A manufacturing apparatus 10 includes: a disc spring 33 that applies back pressure to an iron core member 5 placed on a placement table 30 by being elastically deformed when force is applied from an outer shape punching punch 45 to the placement table 30; a support shaft 34 that supports a lower end portion of the disc spring 33; a control motor 39 that controls movement of the support shaft 34 in a vertical direction Z; and a control device 90 that controls the control motor 39, wherein the control device 90 includes a motor control unit 94 that controls the control motor 39 to start moving the support shaft 34 downward by a predetermined amount in a process in which the elastically deformed disc spring 33 returns to an original shape when the outer shape punching punch 45 moves upward after the outer shape punching punch 45 reaches a bottom dead center and the laminated iron core members 5 are joined to each other by crimping.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an apparatus for manufacturing a laminated core.

Background Art

[0002] The laminated core used in a motor or the like is formed by punching a strip-shaped metal plate (for example, a strip-shaped steel plate) into a predetermined shape to form a core member (core), and laminating and integrating the formed core members. For example, the laminated core is formed by laminating and integrating the core members by caulking, welding, or adhesion. For example, Patent Document 1 discloses a manufacturing apparatus that manufactures a laminated core in which a plurality of core members are laminated by caulking and mutually joined.

[0003] The manufacturing apparatus of Patent Document 1 includes a mounting table attached to the upper surface of a ball screw, a gas spring disposed on the mounting table, and a support plate provided at the upper end of the gas spring on which the core members are sequentially laminated. The gas spring is configured to compress when the support plate is pressed by a punch and apply back pressure to the core members on the support plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, gas springs require a large capacity to apply a certain back pressure to the core material, so the gas springs themselves tend to be large in size. This may result in the manufacturing equipment equipped with the gas springs becoming large in size. In addition, gas springs are configured to apply back pressure to the core material by elastic deformation, but it takes a relatively long time for the gas spring to return to its original state from the elastically deformed state, so the lead time for manufacturing laminated cores tends to be long.

[0006] The present invention has been made in consideration of the above points, and its object is to provide a laminated core manufacturing apparatus that can manufacture laminated cores in a shorter time while preventing the apparatus from becoming too large. [Means for solving the problem]

[0007] The manufacturing apparatus according to the present invention is an apparatus for manufacturing a laminated core in which a plurality of core members are stacked and bonded to one another, and includes a lower mold having a die with a die hole formed therein, an upper mold having a punch that corresponds to the die hole and punches out a strip-shaped metal plate to form the core member, a mounting table on which the formed core members are successively placed, a disc spring located below the mounting table, supporting the mounting table, and applying back pressure to the core member placed on the mounting table by elastically deforming when force is applied to the mounting table from the punch, a support shaft supporting a lower end of the disc spring and configured to be movable in the vertical direction, and a vertical movement of the support shaft. The apparatus comprises a control motor that controls the movement, and a control device that controls the upper die and the control motor, and the laminated core is configured such that the stacked core members are joined to each other by crimping, and as the support shaft moves in the vertical direction, at least the lower end of the disc spring moves in the vertical direction, and the control device comprises a motor control unit that controls the control motor to start moving the support shaft downward a predetermined amount during the process in which the elastically deformed disc spring returns to its original shape when the punch reaches bottom dead center and moves upward after joining the stacked core members to each other by crimping.

[0008] The manufacturing apparatus according to the present invention includes a disc spring that applies back pressure to the core material placed on the mounting table by elastically deforming when a force is applied from the punch to the mounting table. The disc spring is smaller than a gas spring and the like, so that the manufacturing apparatus can be prevented from becoming large in size. In addition, when the punch moves upward after reaching the bottom dead center and joining the stacked core materials to each other by crimping, the motor control unit controls the control motor to start moving the support shaft downward by a predetermined amount during the process in which the elastically deformed disc spring returns to its original shape when the punch moves upward after reaching the bottom dead center and joining the stacked core materials to each other by crimping. This allows the elastically deformed disc spring to return to its original state more quickly, thereby shortening the lead time for manufacturing the laminated core.

[0009] Another manufacturing apparatus according to the present invention is an apparatus for manufacturing a laminated iron core in which a number of core members are stacked and bonded to each other, the apparatus comprising: a lower mold having a die with a die hole formed therein; an upper mold having a punch corresponding to the die hole and punching a strip-shaped metal plate to form the core member; a mounting table on which the formed core members are sequentially placed; a disc spring located below the mounting table and supporting the mounting table, and which applies back pressure to the core member placed on the mounting table by elastically deforming when force is applied to the mounting table from the punch; a support shaft supporting a lower end of the disc spring and configured to be movable in the vertical direction; a control motor which controls the vertical movement of the support shaft; and a control device which controls the upper mold and the control motor, the control device being configured such that at least the lower end of the disc spring moves in the vertical direction as the support shaft moves in the vertical direction, and the control device having a motor control unit which controls the control motor to move the support shaft downward a predetermined amount when force is applied to the mounting table from the punch and the disc spring elastically deforms more than a predetermined amount.

[0010] Another manufacturing apparatus according to the present invention includes a disc spring that applies back pressure to an iron core material placed on the mounting table by elastically deforming when a force is applied from the punch to the mounting table. The disc spring is smaller than a gas spring and the like, which makes it possible to prevent the manufacturing apparatus from becoming large in size. Furthermore, when a force is applied from the punch to the mounting table and the disc spring elastically deforms to a predetermined degree or more, the motor control unit controls the control motor to move the support shaft downward by a predetermined amount. This allows the elastically deformed disc spring to return to its original state more quickly, thereby shortening the lead time for manufacturing a laminated iron core.

[0011] Another manufacturing apparatus according to the present invention is an apparatus for manufacturing a laminated iron core in which a number of iron core members are stacked and bonded to each other, comprising a lower mold having a die with a die hole formed therein, an upper mold having a punch that corresponds to the die hole and punches out a strip-shaped metal plate to form the iron core member, a mounting table on which the formed iron core members are sequentially placed, a disc spring located below the mounting table and supporting the mounting table, and applying back pressure to the iron core members placed on the mounting table by elastically deforming when force is applied to the mounting table from the punch, and a support shaft that supports the lower end of the disc spring and is configured to be movable in the vertical direction, and the disc spring has an elastic force that allows it to elastically deform without causing the support shaft to move downward when force is applied to the mounting table from the punch.

[0012] Another manufacturing apparatus according to the present invention includes a disc spring that elastically deforms when a force is applied from the punch to the mounting table, thereby applying back pressure to the core material placed on the mounting table. The disc spring is smaller than a gas spring and the like, which makes it possible to prevent the manufacturing apparatus from becoming large. Furthermore, the disc spring has an elastic force that allows it to elastically deform without causing the support shaft to move downward when a force is applied from the punch to the mounting table. This makes it possible for the disc spring to more reliably apply back pressure to the core material placed on the mounting table.

[0013] Another manufacturing apparatus according to the present invention is an apparatus for manufacturing a laminated iron core in which a number of iron core members are stacked and bonded to each other, the apparatus comprising: a lower mold having a die with a die hole formed therein; an upper mold having a punch that corresponds to the die hole and punches a strip-shaped metal plate to form the iron core member; a mounting table on which the formed iron core members are sequentially placed; a disc spring located below the mounting table and supporting the mounting table, and applying back pressure to the iron core member placed on the mounting table by elastically deforming when force is applied to the mounting table from the punch; a support shaft that supports the lower end of the disc spring and is configured to be movable in the vertical direction; a control motor that controls the vertical movement of the support shaft; and a control device that controls the upper mold and the control motor, the disc spring having an elastic force that is capable of applying the back pressure required to stack the iron core members by only the back pressure that the disc spring applies to the iron core member placed on the mounting table when force is applied to the mounting table from the punch.

[0014] Another manufacturing apparatus according to the present invention includes a disc spring that elastically deforms when force is applied from the punch to the mounting table, thereby applying back pressure to the core material placed on the mounting table. The disc spring is smaller than a gas spring and the like, which makes it possible to prevent the manufacturing apparatus from becoming large. Furthermore, the disc spring has an elastic force that can apply the back pressure required to stack the core materials solely by the back pressure that the disc spring applies to the core material placed on the mounting table when force is applied from the punch to the mounting table. This makes it possible to more reliably apply the back pressure required to stack the core materials with a simple structure. Effect of the Invention

[0015] According to the present invention, it is possible to provide a laminated core manufacturing apparatus that can manufacture laminated cores in a shorter time while suppressing an increase in the size of the apparatus. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a cross-sectional view showing a part of a manufacturing apparatus for a laminated core according to one embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a portion of the mounting table and the support member according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a laminated core manufacturing apparatus according to the present invention will be described with reference to the drawings. Note that the embodiment described here is not intended to limit the present invention in any particular way. Also, the same reference numerals are used for members and parts that perform the same function, and duplicated descriptions are omitted or simplified as appropriate.

[0018] As shown in FIG. 1, a laminated iron core manufacturing apparatus 10 (hereinafter referred to as manufacturing apparatus 10) of this embodiment manufactures a laminated iron core 8 in which a plurality of core members 5 are stacked and bonded to each other. The manufacturing apparatus 10 is a progressive press die. In the manufacturing apparatus 10, a strip-shaped metal plate W is intermittently conveyed in a progressive direction D. The strip-shaped metal plate W is, for example, a coil material (strip-shaped thin steel plate). The manufacturing apparatus 10 includes a lower die 20, an upper die 40, a stripper plate 60, and a control device 90.

[0019] The lower die 20 is fixed to a floor surface. As shown in Fig. 1, the lower die 20 is provided with an outline punching stage 25. The outline punching stage 25 includes a die plate 22, a die 23, an outline punching die hole 26, a squeeze ring 27, and an outline punching punch 45, which will be described later. The outline punching die hole 26 is an example of a die hole. The outline punching punch 45 is an example of a punch.

[0020] The lower mold 20 has a lower mold body 21, a die plate 22, and a die 23. The die plate 22 and the die 23 are placed on the lower mold body 21. The die plate 22 holds the die 23. The die 23 includes an outer shape punching stage 25. A die hole 26 for punching the outer shape is formed in the die 23. An upper surface 22T of the die plate 22 and an upper surface 23T of the die 23 are located at the same height.

[0021] As shown in Fig. 1, squeeze ring 27 is disposed below die 23. Squeeze ring 27 holds formed core member 5 from the side. Squeeze ring 27 applies lateral pressure (i.e., clamping force) to stacked core members 5. Squeeze ring 27 holds core member 5 punched into outline punching die hole 26 by outline punching punch 45 (described later) with a predetermined lateral pressure.

[0022] The strip-shaped metal sheet W is intermittently transported to the lower die 20 by a transport device (not shown) provided near the manufacturing device 10. The strip-shaped metal sheet W is intermittently transported to the outline punching stage 25. The transport device holds the strip-shaped metal sheet W in a wound state. The strip-shaped metal sheet W is transported to the lower die 20 by an unwinding device (not shown) of the transport device, and the end material of the pressed strip-shaped metal sheet W is transported from the lower die 20 by a winding device (not shown) of the transport device and wound up on the winding device. Note that instead of the unwinding device and winding device of the transport device, the strip-shaped metal sheet W may be sandwiched between a pair of upper and lower rotating rolls arranged on the upstream and downstream sides of the manufacturing device 10, respectively, and transported.

[0023] As shown in Fig. 1, the manufacturing apparatus 10 includes a mounting table 30, a support member 31, and a control motor 39. The mounting table 30 is provided so as to be movable up and down. The formed core members 5 are sequentially mounted on the mounting table 30. The mounting table 30 has a mounting surface 30F on which the core members 5 are mounted. The mounting surface 30F can be located inside the die 23 and the squeeze ring 27. The laminated core 8 is manufactured on the mounting surface 30F.

[0024] 1, the support member 31 supports the mounting table 30 so that the mounting table 30 can be raised and lowered. The support member 31 includes a support table 32, a plurality of disc springs 33, a support shaft , a bearing 35 (see FIG. 2), and a ball screw .

[0025] As shown in FIG. 2, the support table 32 is located below the mounting table 30. The support table 32 directly supports the mounting table 30. The support table 32 is provided so as to be movable in the vertical direction Z relative to the support shaft 34. The support table 32 is inserted into an insertion hole 34H of the support shaft 34, which will be described later, so as to be movable in the vertical direction Z relative to the support shaft 34. The support table 32 is provided so as to be movable in the vertical direction Z together with the support shaft 34. For example, when a force is applied from the punch 45 for punching an outer shape to the mounting table 30, the support table 32 moves relative to the support shaft 34. Also, for example, when a force is not applied from the punch 45 for punching an outer shape to the mounting table 30, the support table 32 moves together with the support shaft 34.

[0026] As shown in FIG. 2, the disc spring 33 is located below the mounting table 30. The disc spring 33 is attached to the support table 32. The disc spring 33 is located between a part of the support table 32 and the support shaft 34. The disc spring 33 is sandwiched between a part of the support table 32 and the support shaft 34. The disc spring 33 supports the support table 32. The disc spring 33 indirectly supports the mounting table 30 via the support table 32. The disc spring 33 may directly support the mounting table 30. The disc spring 33 elastically deforms when a force is applied to the mounting table 30 from the outer shape punching punch 45, thereby applying a back pressure to the core member 5 placed on the mounting table 30. The disc spring 33 elastically deforms, causing the mounting table 30 to move downward. The disc spring 33 is configured to be elastically deformable in the vertical direction Z by a distance greater than the vertical movement of the core member 5 required to clamp the core members 5 together. The disc spring 33 has an elastic force that allows the support shaft 34 to be elastically deformed without moving downward when a force is applied from the punch 45 for punching the outer shape to the mounting table 30. The disc spring 33 has an elastic force that allows the disc spring 33 to apply a back pressure required to stack the core members 5 only by the back pressure applied by the disc spring 33 to the core member 5 placed on the mounting table 30 when a force is applied from the punch 45 for punching the outer shape to the mounting table 30. The axis 33C of the disc spring 33 is arranged coaxially with the axis 34C of the support shaft 34 (for example, the shaft portion 34A described later). The disc spring 33 is arranged such that the inner peripheral edge 33B is located closer to the mounting table 30 (i.e., above) than the outer peripheral edge 33A.

[0027] As shown in FIG. 2, the support shaft 34 supports the lower end of the disc spring 33. The support shaft 34 is configured to be movable in the vertical direction Z. When the support shaft 34 moves in the vertical direction Z, at least the lower end of the disc spring 33 moves in the vertical direction Z. The support shaft 34 has a shaft portion 34A extending in the vertical direction Z and a support portion 34B provided at the upper end of the shaft portion 34A. The shaft portion 34A and the support portion 34B are connected to each other by a fastening member (e.g., a bolt, a screw, etc.) not shown. A gap 32S is formed between the upper end 34AT of the shaft portion 34A and the lower end 32B of the support base 32. As shown in FIG. 1, the lower end of the shaft portion 34A is connected to a nut 36A of the ball screw 36, which will be described later. As shown in FIG. 2, the support portion 34B supports the lower end of the disc spring 33. The support portion 34B is formed with an insertion hole 34H into which the support base 32 is inserted.

[0028] 2, the bearing 35 is provided between the mounting table 30 and the disc spring 33. More specifically, the bearing 35 is provided between the mounting table 30 and the support table 32. The bearing 35 rotatably supports the mounting table 30. As the bearing 35 rotates, the mounting table 30 rotates relative to the support table 32. When the bearing 35 rotates, the disc spring 33 does not rotate.

[0029] 1, the ball screw 36 includes a nut 36A and a screw shaft 36B. The nut 36A is screwed onto the screw shaft 36B. The screw shaft 36B is connected to a rotating shaft of a control motor 39. When the control motor 39 rotates, the screw shaft 36B rotates, causing the nut 36A to rise and fall. As a result, the mounting table 30 also rises and falls.

[0030] 1, the control motor 39 raises and lowers the mounting table 30 via the support member 31. The control motor 39 controls the movement of the support shaft 34 in the up-down direction Z. Examples of the control motor 39 include a servo motor and a stepping motor. The control motor 39 is controlled by a control device 90.

[0031] As shown in FIG. 1, the upper die 40 is disposed above the lower die 20. The upper die 40 is configured to be able to rise and fall (to be able to move in the vertical direction Z). The upper die 40 is configured to be able to approach and move away from the lower die 20. The upper die 40 has an outline punch 45 corresponding to the outline punching die hole 26. The upper die 40 and the outline punching punch 45 rise and fall together. The outline punching punch 45 is located above the outline punching die hole 26. The outline punching punch 45 is configured to be able to pass through the outline punching die hole 26. In the outline punching stage 25, after the upper die 40 descends and approaches the lower die 20, the strip-shaped metal plate W is punched out by the outline punching punch 45 and the outline punching die hole 26. As a result, the outer shape of the core member 5 is formed on the band-shaped metal plate W to complete the core member 5, and the core members 5 are sequentially stacked on the mounting table 30. When the band-shaped metal plate W is punched out, a back pressure is applied to the core member 5 placed on the mounting table 30 by the disc springs 33, as will be described later. Here, the stacked core members 5 are joined to each other by crimping. For example, the laminated core 8 is formed by repeatedly joining the crimped portions (joint portions) formed on each of the two core members 5 stacked in the vertical direction Z to each other by crimping.

[0032] As shown in FIG. 1, the stripper plate 60 is provided on the upper die 40. The stripper plate 60 is disposed at a position facing the die plate 22 of the lower die 20. The stripper plate 60 is configured to be movable in the vertical direction Z together with the upper die 40. The stripper plate 60 is configured to be movable downward to a lowest position (not shown) which is the lowest position. When the stripper plate 60 is punched out of the strip-shaped metal plate W by the outline punching punch 45, the stripper plate 60 restricts the metal plate W from moving in the vertical direction Z at the lowest position. When the stripper plate 60 moves to the lowest position, the stripper plate 60 is configured to press the intermittently conveyed strip-shaped metal plate W against the lower die 20 (here, the die plate 22 and the die 23) and to sandwich the strip-shaped metal plate W together with the lower die 20 (here, the die plate 22 and the die 23). The stripper plate 60 presses the strip-shaped metal plate W against the upper surface 22T of the die plate 22 and the upper surface 23T of the die 23. A punch insertion hole 60A through which the outer shape punching punch 45 is inserted is formed in the stripper plate 60. When the upper die 40 is further lowered in a state in which the stripper plate 60 presses the band-shaped metal sheet W against the die plate 22, the outer shape punching punch 45 protrudes downward from the punch insertion hole 60A, and the outer shape punching punch 45 is inserted into the outer shape punching die hole 26.

[0033] As shown in FIG. 1, the control device 90 controls the upper mold 40 and the control motor 39. The control device 90 includes, for example, a central processing unit (CPU) that executes instructions of a control program, a ROM that stores the program executed by the CPU, a RAM that is used as a working area for expanding the program, and a storage device such as a memory that stores the program and various data. The control device 90 includes an upper mold control unit 92 and a motor control unit 94. The functions of each unit of the control device 90 are realized by a program. This program is downloaded, for example, via the Internet. The program may be read from a recording medium such as a CD or DVD. The functions of each unit of the control device 90 may be realized by a processor and / or a circuit.

[0034] The upper die control unit 92 controls the lifting and lowering movement (movement in the vertical direction Z) of the upper die 40. In this embodiment, the upper die control unit 92 controls the movement of the outline punching punch 45 and the stripper plate 60 in the vertical direction Z by moving the upper die 40 in the vertical direction Z. The upper die control unit 92 controls the approach of the upper die 40 to the lower die 20 and the separation of the upper die 40 from the lower die 20.

[0035] The motor control unit 94 controls the control motor 39. The motor control unit 94 controls the movement of the support shaft 34 in the up-down direction Z by controlling the control motor 39. The motor control unit 94 controls the lifting and lowering movement (movement in the up-down direction Z) of the mounting table 30 by controlling the control motor 39. When the punch 45 for punching the outer shape reaches the bottom dead center and joins the stacked core members 5 to each other by crimping, and then the punch 45 for punching the outer shape moves upward, the motor control unit 94 controls the control motor 39 to start moving the support shaft 34 downward by a predetermined amount in the process in which the elastically deformed disc spring 33 returns to its original shape. The "predetermined amount" is, for example, the amount of descent of the mounting table 30 when the punch 45 for punching the outer shape crimps and stacks the core members 5, that is, the amount equivalent to the thickness of one sheet of the crimped and stacked core members 5. "When the contour punching punch 45 moves upward, in the process of the elastically deformed disc spring 33 returning to its original shape, the control motor 39 is controlled to start moving the support shaft 34 downward by a predetermined amount" includes, for example, starting to move the support shaft 34 downward by a predetermined amount at the same timing as the timing when the contour punching punch 45 starts moving upward, and starting to move the support shaft 34 downward by a predetermined amount when a predetermined time has elapsed from the timing when the contour punching punch 45 starts moving upward and the disc spring 33 returns to its original shape. In this embodiment, the motor control unit 94 controls the control motor 39 to start moving the support shaft 34 downward by a predetermined amount when a predetermined time has elapsed from the timing when the contour punching punch 45 starts moving upward after the contour punching punch 45 reaches the bottom dead center and joins the stacked iron core members 5 to each other by crimping and the elastically deformed disc spring 33 returns to its original shape. When the punch 45 for punching the outer shape reaches the bottom dead center and joins the stacked core members 5 to each other by crimping, and then the punch 45 for punching the outer shape moves upward, the motor control unit 94 may control the control motor 39 to complete moving the support shaft 34 downward a predetermined amount at the same time that the elastically deformed disc spring 33 returns to its original shape.When the punch 45 for punching an outline reaches the bottom dead center and joins the stacked core members 5 to each other by crimping, and then the punch 45 for punching an outline moves upward, the motor control unit 94 may control the control motor 39 to complete moving the support shaft 34 downward by a predetermined amount before the elastically deformed disc spring 33 returns to its original shape. The motor control unit 94 may control the control motor 39 to move the support shaft 34 downward by a predetermined amount when the disc spring 33 is elastically deformed by a predetermined amount or more due to the force applied from the punch 45 for punching an outline to the mounting table 30. The motor control unit 94 may directly control the support shaft 34 to move downward, or may indirectly control the support shaft 34 to move downward by other control, for example, by controlling the drive torque of the control motor 39.

[0036] As described above, the manufacturing apparatus 10 of the present embodiment includes the disc spring 33 that applies back pressure to the core member 5 placed on the mounting table 30 by elastically deforming when a force is applied from the punch 45 for punching the outer shape to the mounting table 30. The disc spring 33 is smaller than a gas spring or the like, so that the manufacturing apparatus 10 can be prevented from becoming large. In addition, when the punch 45 for punching the outer shape reaches the bottom dead center and joins the laminated core members 5 to each other by crimping, and then the punch 45 for punching the outer shape moves upward, the motor control unit 94 controls the control motor 39 to start moving the support shaft 34 downward by a predetermined amount during the process in which the elastically deformed disc spring 33 returns to its original shape when the punch 45 for punching the outer shape moves upward. This allows the elastically deformed disc spring 33 to return to its original state more quickly, so that the lead time for manufacturing the laminated core 8 can be shortened.

[0037] In the manufacturing apparatus 10 of this embodiment, when the punch 45 moves upward after reaching the bottom dead center and joining the stacked core members 5 to each other by crimping, the motor control unit 94 controls the control motor 39 to complete moving the support shaft 34 downward a predetermined amount at the same time as or before the elastically deformed disc springs 33 return to their original shape. According to the above aspect, the elastically deformed disc springs 33 can be returned to their original state more quickly, thereby shortening the lead time for manufacturing the laminated core 8.

[0038] In the manufacturing apparatus 10 of this embodiment, the disc spring 33 is configured to be elastically deformable in the vertical direction Z by a larger amount than the amount of movement in the vertical direction Z of the core member 5 required when crimping the core members 5 together. According to the above aspect, the disc spring 33 can apply an appropriate back pressure to the core member 5 placed on the mounting table 30.

[0039] In the manufacturing apparatus 10 of this embodiment, when the bearing 35 that rotatably supports the mounting table 30 rotates, the disc spring 33 does not rotate. According to the above aspect, the iron core member 5 can be more appropriately positioned on the mounting table 30, and since the disc spring 33 does not rotate, a more appropriate back pressure can be applied to the iron core member 5 mounted on the mounting table 30.

[0040] In the manufacturing apparatus 10 of this embodiment, the axis 33C of the disc spring 33 is arranged coaxially with the axis 34C of the support shaft 34. According to the above-mentioned embodiment, the disc spring 33 can be arranged compactly.

[0041] In the manufacturing apparatus 10 of this embodiment, the disc spring 33 is disposed such that the inner peripheral edge 33B is located closer to the mounting table 30 than the outer peripheral edge 33A. According to the above-described embodiment, it is possible to apply a more appropriate back pressure to the core member 5 mounted on the mounting table 30.

[0042] Although the preferred embodiments of the present invention have been described above, the above-described embodiments are merely examples, and the present invention can be embodied in various other forms.

[0043] In the above-described embodiment, the stacked core members 5 are joined to each other by crimping, but the joining method is not limited to crimping. The stacked core members 5 may be joined to each other by, for example, welding or adhesive.

[0044] In the above-described embodiment, the lower die body 21, the die plate 22, and the die 23 of the lower die 20 are configured as separate bodies, but they may be configured as an integral body as appropriate. For example, the die plate 22 and the die 23 may be configured as an integral body, or the die plate 22, the die 23, and the lower die body 21 may be configured as an integral body.

[0045] In the above-described embodiment, the upper surface 23T of the die 23 and the upper surface 22T of the die plate 22 are located at the same height, but are not limited to this. For example, the upper surface 23T of the die 23 may be located lower than the upper surface 22T of the die plate 22. In this case, the stripper plate 60 presses the belt-shaped metal sheet W against the upper surface 22T of the die plate 22.

[0046] In the above-described embodiment, the manufacturing apparatus 10 was equipped with a punch 45 for punching the outer shape and a die hole 26 for punching the outer shape, but it may further be equipped with a punch for punching the inner shape and a die hole for punching the inner shape, a punch for forming a pilot hole and a die hole for forming a pilot hole, etc. [Explanation of symbols]

[0047] 5 Core material 8 Laminated core 10 Manufacturing equipment (laminated iron core manufacturing equipment) 20 Lower mold 23 Die 26 Die hole for punching the outer shape (Die hole) 30 Placement table 33 Disc spring 34 Support shaft 35 Bearings 39 Control motor 40 Upper mold 45 Outline punching punch (punch) 90 Control device 94 Motor control unit

Claims

1. A manufacturing apparatus for a laminated core in which a plurality of core members are stacked and bonded to each other, comprising: A lower mold having a die with a die hole formed therein; an upper die having a punch corresponding to the die hole and punching out a strip-shaped metal plate to form the core member; a mounting table on which the formed core members are successively placed; a disc spring located below the mounting table, supporting the mounting table, and elastically deforming when a force is applied from the punch to the mounting table to apply a back pressure to the core member placed on the mounting table; A support shaft that supports a lower end of the disc spring and is configured to be movable in the vertical direction; A control motor for controlling the vertical movement of the support shaft; a control device for controlling the upper mold and the control motor, In the laminated core, the laminated core members are joined to each other by crimping, The support shaft is configured to move vertically, so that at least the lower end of the disc spring moves vertically, The control device includes: The manufacturing apparatus includes a motor control unit that controls the control motor to start moving the support shaft downward a predetermined amount during the process when the punch moves upward after reaching the bottom dead center and joining the stacked iron core members to each other by crimping, causing the elastically deformed disc spring to return to its original shape.

2. 2. The manufacturing apparatus of claim 1, wherein when the punch moves upward after reaching the bottom dead center and crimping the stacked iron core members together, the motor control unit controls the control motor to complete moving the support shaft downward by the predetermined amount at the same time as or before the elastically deformed disc spring returns to its original shape when the punch moves upward after reaching the bottom dead center and crimping the stacked iron core members together.

3. 3. The manufacturing apparatus according to claim 1, wherein the disc spring is configured to be elastically deformable in the vertical direction by a distance greater than an amount of vertical movement of the core members required when crimping the core members together.

4. a bearing provided between the mounting table and the disc spring and configured to rotatably support the mounting table; 3. The manufacturing apparatus of claim 1 or 2, wherein the disc spring does not rotate when the bearing rotates.

5. The manufacturing apparatus according to claim 1 or 2, wherein an axis of the disc spring is arranged coaxially with an axis of the support shaft.

6. The manufacturing apparatus according to claim 1 or 2, wherein the disc spring is arranged such that an inner periphery of the disc spring is positioned closer to the mounting table than an outer periphery of the disc spring.

7. A manufacturing apparatus for a laminated core in which a plurality of core members are stacked and bonded to each other, comprising: A lower mold having a die with a die hole formed therein; an upper die having a punch corresponding to the die hole and punching out a strip-shaped metal plate to form the core member; a mounting table on which the formed core members are successively placed; a disc spring located below the mounting table, supporting the mounting table, and elastically deforming when a force is applied from the punch to the mounting table to apply a back pressure to the core member placed on the mounting table; A support shaft that supports a lower end of the disc spring and is configured to be movable in the vertical direction; A control motor for controlling the vertical movement of the support shaft; a control device for controlling the upper mold and the control motor, The support shaft is configured to move vertically, so that at least the lower end of the disc spring moves vertically, The control device includes: the manufacturing apparatus further comprising a motor control unit that controls the control motor to move the support shaft downward a predetermined amount when a force is applied from the punch to the mounting table and the disc spring elastically deforms to a predetermined extent or more.

8. A manufacturing apparatus for a laminated core in which a plurality of core members are stacked and bonded to each other, comprising: A lower mold having a die with a die hole formed therein; an upper die having a punch corresponding to the die hole and punching out a strip-shaped metal plate to form the core member; a mounting table on which the formed core members are successively placed; a disc spring located below the mounting table, supporting the mounting table, and elastically deforming when a force is applied from the punch to the mounting table to apply a back pressure to the core member placed on the mounting table; A support shaft that supports a lower end of the disc spring and is configured to be movable in a vertical direction, The disc spring has an elastic force that allows the support shaft to elastically deform without moving downward when a force is applied from the punch to the mounting table.

9. A manufacturing apparatus for a laminated core in which a plurality of core members are stacked and bonded to each other, comprising: A lower mold having a die with a die hole formed therein; an upper die having a punch corresponding to the die hole and punching out a strip-shaped metal plate to form the core member; a mounting table on which the formed core members are successively placed; a disc spring located below the mounting table, supporting the mounting table, and elastically deforming when a force is applied from the punch to the mounting table to apply a back pressure to the core member placed on the mounting table; A support shaft that supports a lower end of the disc spring and is configured to be movable in the vertical direction; A control motor for controlling the vertical movement of the support shaft; a control device for controlling the upper mold and the control motor, A manufacturing apparatus in which the disc spring has an elastic force that can apply the back pressure required to stack the iron core members solely by the back pressure that the disc spring applies to the iron core member placed on the mounting table when force is applied from the punch to the mounting table.

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