Manufacturing equipment for laminated iron cores
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- FCC KK
- Filing Date
- 2024-07-29
- Publication Date
- 2026-08-04
AI Technical Summary
【0011】 本発明によれば、金属板を打ち抜いて鉄心部材を形成するときに適切な背圧を付与すると共に、載置台に載置された鉄心部材の突き上げを抑制することができる積層鉄心の製造装置を提供することができる。
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Abstract
Description
Technical Field
[0005] , ,
[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 and adhered to each other using an adhesive.
[0003] The manufacturing apparatus of Patent Document 1 includes a pedestal on which core members are sequentially placed, a lifting motor that performs the lifting operation of the pedestal, and a control device that controls the rotational operation of the lifting motor. Then, in order to more effectively perform the lamination of the laminated core, at the time of punching the core member, the torque limit value of the lifting motor is set to "high" to apply an upward pressure (back pressure) by the pedestal on which the laminated core is sequentially laminated, and at the time of non-punching of the core member, in order to suppress the core member from being pushed up by the pedestal, the torque limit value of the lifting motor is set to "low".
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] Incidentally, if the output torque setting of the lifting motor is not appropriate, it may not be possible to apply sufficient back pressure, which could result in improper punching or lamination of the core members, or the core members being pushed up by the support base.
[0006] The present invention has been made in view of the above, and its object is to provide a manufacturing apparatus for laminated iron cores that can apply appropriate back pressure when punching out metal plates to form iron core members, and can suppress the pushing up of iron core members placed on a mounting table. [Means for solving the problem]
[0007] The manufacturing apparatus for laminated iron cores according to the present invention involves stacking multiple iron core members and interacting with each other. join A manufacturing apparatus for laminated iron cores, comprising: a lower die having a die with die holes formed therein; an upper die having a punch corresponding to the die holes, which punches out a strip of metal plate to form the iron core member; a mounting table that is provided to be vertically movable and on which the formed iron core members are sequentially placed; a support member that supports the mounting table so as to be vertically movable; a lifting motor that moves the mounting table up and down via the support member; and a control device that controls the upper die and the lifting motor, wherein the control device sets the output torque of the lifting motor to a first output torque to suppress the pushing up of the iron core member by the mounting table when the metal plate is not punched out by the punch, and sets the output torque of the lifting motor to a second output torque higher than the first output torque to apply back pressure to the iron core member by the mounting table when the metal plate is punched out by the punch to form the iron core member, and includes a torque control unit configured to change the difference between the first output torque and the second output torque.
[0008] According to the laminated core manufacturing apparatus of the present invention, the torque control unit is configured to change the difference between a first output torque and a second output torque. In this embodiment, the first output torque and the second output torque can be appropriately set according to the metal plate and the core member to be formed. Therefore, appropriate back pressure can be applied when punching out the metal plate to form the core member while suppressing the occurrence of the core member being pushed up when it is placed on the mounting table.
[0009] Furthermore, in another manufacturing apparatus for laminated iron cores according to the present invention, multiple iron core members are laminated and interact with each other. join A manufacturing apparatus for laminated iron cores, comprising: a lower die having a die with die holes formed therein; an upper die having a punch corresponding to the die holes, which punches out a strip of metal plate to form the iron core members; a mounting table that is provided to be vertically movable and on which the formed iron core members are sequentially placed; a support member that supports the mounting table so as to be vertically movable; a lifting motor that moves the mounting table up and down via the support member; and a control device that controls the upper die and the lifting motor, wherein the control device sets the output torque of the lifting motor to a first output torque to suppress the pushing up of the iron core members by the mounting table when the metal plate is not punched out by the punch, and sets the output torque of the lifting motor to a second output torque higher than the first output torque to apply back pressure to the iron core members by the mounting table when the metal plate is punched out by the punch to form the iron core members, and includes a torque control unit configured to change the first output torque.
[0010] In another laminated core manufacturing apparatus according to the present invention, the torque control unit is configured to change the first output torque. According to the above embodiment, the first output torque can be appropriately set according to the metal plate and the core member to be formed. Therefore, the occurrence of the core member placed on the mounting table being pushed up can be suppressed more reliably. In addition, by appropriately setting the second output torque, appropriate back pressure can be applied when punching out the metal plate to form the core member. [Effects of the Invention]
[0011] According to the present invention, it is possible to provide a laminated core manufacturing apparatus that can apply appropriate back pressure when punching out metal plates to form core members, and can also suppress the upward thrusting of core members placed on a mounting table. [Brief explanation of the drawing]
[0012] [Figure 1] Figure 1 is a cross-sectional view showing a part of a manufacturing apparatus for laminated iron cores according to one embodiment. [Figure 2] Figure 2 is an example of a graph showing the relationship between the vertical position of the upper unit, the position of the mounting platform, and the output torque of the lifting motor according to one embodiment. [Modes for carrying out the invention]
[0013] Hereinafter, embodiments of the manufacturing apparatus for laminated iron cores according to the present invention will be described with reference to the drawings. It should be noted that the embodiments described herein are not intended to limit the present invention. Furthermore, the same reference numerals are used for components and parts that perform the same function, and redundant explanations are omitted or simplified as appropriate.
[0014] As shown in Figure 1, the laminated core manufacturing apparatus 10 (hereinafter referred to as manufacturing apparatus 10) of this embodiment manufactures a laminated core 8 in which a plurality of core members 5 are laminated and interconnected. The manufacturing apparatus 10 is a progressive press die. In the manufacturing apparatus 10, a strip-shaped metal plate W is intermittently conveyed in the progressive direction D. The strip-shaped metal plate W is, for example, a coil material (strip-shaped thin steel plate). The manufacturing apparatus 10 comprises a lower die 20, an upper die 40, a stripper plate 60, and a control device 90.
[0015] The lower die 20 is fixed to the floor. As shown in Figure 1, the lower die 20 is provided with an outer shape punching stage 25. The outer shape punching stage 25 includes a die plate 22 (described later), a die 23, an outer shape punching die hole 26, a squeeze ring 27, and an outer shape punching punch 45. The outer shape punching die hole 26 is an example of a die hole. The outer shape punching punch 45 is an example of a punch.
[0016] The lower die 20 comprises a lower die body 21, a die plate 22, and a die 23. The die plate 22 and the die 23 are placed on the lower die body 21. The die plate 22 holds the die 23. The die 23 includes an outer shape punching stage 25. The die 23 has an outer shape punching die hole 26 formed therein. The upper surface 22T of the die plate 22 and the upper surface 23T of the die 23 are at the same height.
[0017] As shown in Figure 1, the squeeze ring 27 is positioned below the die 23. The squeeze ring 27 holds the formed core member 5 from the side. The squeeze ring 27 applies lateral pressure (i.e., clamping force) to the stacked core member 5. The squeeze ring 27 holds the core member 5, which has been punched into the outer shape punching die hole 26 by the outer shape punching punch 45 (described later), with a predetermined lateral pressure.
[0018] The strip-shaped metal sheet W is intermittently conveyed to the lower die 20 by a conveying device (not shown) located near the manufacturing apparatus 10. The strip-shaped metal sheet W is intermittently conveyed to the outer shape punching stage 25. The conveying device holds the strip-shaped metal sheet W in a wound state. The strip-shaped metal sheet W is conveyed to the lower die 20 by an unwinding device (not shown) of the conveying device, and the end material of the pressed strip-shaped metal sheet W is conveyed from the lower die 20 by a winding device (not shown) of the conveying device and wound onto the winding device. Alternatively, instead of the unwinding and winding devices of the conveying device, the strip-shaped metal sheet W may be conveyed by sandwiching it between a pair of upper and lower rotating rolls located upstream and downstream of the manufacturing apparatus 10, respectively.
[0019] As shown in FIG. 1, the manufacturing apparatus 10 includes a mounting table 30, a support member 32, and a lifting motor 36. The mounting table 30 is provided so as to be able to move up and down. On the mounting table 30, the formed core members 5 are sequentially placed. The mounting table 30 has a mounting surface 30F on which the core members 5 are placed. The mounting surface 30F can be located inside the die 23 and the squeezing ring 27. On the mounting surface 30F, the laminated core 8 is manufactured.
[0020] As shown in FIG. 1, the support member 32 supports the mounting table 30 so as to be able to move up and down. The support member 32 includes a support shaft 33 and a ball screw 35. The support shaft 33 extends in the vertical direction Z. The upper end of the support shaft 33 is connected to the lower end of the mounting table 30. The support shaft 33 supports the mounting table 30. The lower end of the support shaft 33 is connected to a nut 35A of the ball screw 35 described later. The ball screw 35 includes a nut 35A and a screw shaft 35B. The nut 35A is screwed onto the screw shaft 35B. The screw shaft 35B is connected to the rotating shaft of the lifting motor 36. When the lifting motor 36 rotates and the screw shaft 35B rotates, the nut 35A moves up and down. Thereby, the mounting table 30 also moves up and down.
[0021] As shown in FIG. 1, the lifting motor 36 moves the mounting table 30 up and down via the support member 32. Examples of the lifting motor 36 include a servo motor and a stepping motor. The lifting motor 36 is controlled by a control device 90. The lifting motor 36 is configured to be able to press the core member 5 placed on the mounting surface 30F upward via the support member 32 and the mounting table 30. Thereby, back pressure is applied to the core member 5. As will be described later, back pressure due to setting the output torque of the lifting motor 36 as a first output torque and back pressure due to setting the output torque of the lifting motor 36 as a second output torque can be applied to the core member 5 placed on the mounting table 30. Note that the back pressure applied to the core member 5 by setting the first output torque is smaller than the side pressure applied to the core member 5 by the squeezing ring 27. Thereby, the upward push of the core member 5 can be suppressed.
[0022] As shown in FIG. 1, the manufacturing apparatus 10 includes a sensor 38 that detects the load applied to the mounting table 30 from the outer shape punching punch 45 when punching the metal plate W to form the core member 5. The sensor 38 is provided on the mounting table 30. The sensor 38 is connected to the control device 90. The sensor 38 is, for example, a pressure sensor. Note that the sensor 38 directly detects the load applied to the mounting table 30 from the outer shape punching punch 45, but may be a sensor that indirectly detects the above load by other methods.
[0023] As shown in FIG. 1, the upper die 40 is disposed above the lower die 20. The upper die 40 is configured to be movable up and down (movable in the vertical direction Z). The upper die 40 is configured to be able to approach and separate from the lower die 20. The upper die 40 has an outer shape punching punch 45 corresponding to the outer shape punching die hole 26. The upper die 40 and the outer shape punching punch 45 move up and down integrally. The outer shape punching punch 45 is located above the outer shape punching die hole 26. The outer shape punching punch 45 is configured to be insertable into the outer shape punching die hole 26. In the outer shape punching stage 25, after the upper die 40 descends and approaches the lower die 20, the belt-shaped metal plate W is punched by the outer shape punching punch 45 and the outer shape punching die hole 26. As a result, the outer shape of the core member 5 is formed on the belt-shaped metal plate W, and the core member 5 is completed, and the core members 5 are sequentially stacked on the mounting table 30. When the belt-shaped metal plate W is punched, as will be described later, the output torque of the lifting motor 36 is changed to the second output torque, and back pressure is applied to the core member 5. Here, the stacked core members 5 are joined to each other by caulking. For example, the laminated core 8 is formed by repeatedly caulking and joining the caulking portions (joining portions) formed on two core members 5 laminated in the vertical direction Z to each other.
[0024] As shown in Figure 1, the stripper plate 60 is provided on the upper die 40. The stripper plate 60 is positioned opposite 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 the lowest position (not shown), which is the lowest position. When the strip-shaped metal plate W is punched out by the outer shape punching punch 45, the stripper plate 60 restricts the movement of the metal plate W in the vertical direction Z at the lowest position. When the stripper plate 60 moves to the lowest position, it is configured to press the intermittently conveyed strip-shaped metal plate W against the lower die 20 (in this case, the die plate 22 and die 23), and to clamp the strip-shaped metal plate W together with the lower die 20 (in this case, the die plate 22 and 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. The stripper plate 60 has a punch insertion hole 60A through which the outer shape punching punch 45 is inserted. When the upper die 40 descends and the stripper plate 60 presses the strip-shaped metal plate W against the die plate 22, the upper die 40 descends further, causing the outer shape punching punch 45 to protrude from the punch insertion hole 60A and be inserted into the outer shape punching die hole 26.
[0025] Figure 2 is an example graph showing the relationship between the vertical Z position of the upper die 40, the vertical Z position of the mounting base 30, and the output torque of the lifting motor 36 during one cycle, from when the upper die 40 is at top dead center, through bottom dead center, and back to top dead center. Note that the relationship between the vertical Z position of the upper die 40, the vertical Z position of the mounting base 30, and the output torque of the lifting motor 36 is not limited to that shown in Figure 2. The vertical axis of Figure 2 shows the vertical Z position of the upper die 40 and the vertical Z position of the mounting base 30, and the horizontal axis of Figure 2 shows the angle (crank angle) of the upper die 40. Also, in Figure 1, the vertical Z position of the upper die 40 is shown by a solid line, the output torque of the lifting motor 36 is shown by a dashed line, and the vertical Z position of the mounting base 30 is shown by a double dashed line.
[0026] As shown in Figure 2, at timing T0, when the upper die 40 is at top dead center, the strip-shaped metal plate W is being transported in the forward direction D (see Figure 1). At this time, the output torque of the lifting motor 36 is set to the first output torque by the torque control unit 94, which will be described later. When the upper die 40 moves downward and passes the midpoint between top dead center and bottom dead center at timing T1, and reaches timing T2, the transport of the strip-shaped metal plate W is completed. That is, from timing T2 to timing T9, which will be described later, the transport of the strip-shaped metal plate W is stopped. When the upper die 40 moves further downward and reaches timing T3, the stripper plate 60 comes into contact with the metal plate W. When the upper die 40 moves further downward and reaches timing T4, the punching of the metal plate W is started by the outer shape punching punch 45. That is, the lower surface 45B of the outer shape punching punch 45 comes into contact with the upper surface WT (see Figure 1) of the metal plate W. In the example shown in Figure 2, at timing T4, the output torque of the lifting motor 36 is changed from the first output torque to the second output torque by the torque control unit 94. When the upper die 40 moves further down and reaches timing T5, the iron core member 5 formed by punching out the metal plate W begins to fall downward. At timing T6, the punched-out and fallen iron core member 5 comes into contact with the upper surface 5T of the iron core member 5 placed on the mounting base 30. When the upper die 40 moves further down and reaches timing T7, the formed iron core member 5 and the stacked iron core member 5 are crimped and coupled together by the outer shape punching punch 45. Also, at timing T7, the upper die 40 is at the bottom dead center. In the example shown in Figure 2, at timing T7, the output torque of the lifting motor 36 is changed from the second output torque to the first output torque by the torque control unit 94. Here, the torque control unit 94 maintains the output torque of the lifting motor 36 at the second output torque from timing T4 to timing T7, and maintains the output torque of the lifting motor 36 at the first output torque from timing T7 through timing T0 to timing T4. Then, the upper mold 40 starts moving upward. When the upper mold 40 moves upward from the bottom dead center and reaches timing T8, the pressing of the metal plate W by the stripper plate 60 is completed.When the upper die 40 moves further upward and reaches timing T9, the conveying of the strip-shaped metal plate W begins. That is, from timing T9 through timing T0 to timing T2, the strip-shaped metal plate W is conveyed in the forward direction D. Then, the upper die 40 moves upward, passes the midpoint at timing T10, and reaches the top dead center at timing T0. In this way, by the upper die 40 repeatedly descending and rising (i.e., the punch 45 for punching the outer shape repeatedly descending and rising), a laminated iron core 8 having a preset thickness can be manufactured. Once the laminated iron core 8 is manufactured, the lifting motor 36 is driven to lower the mounting table 30, and then the laminated iron core 8 is discharged from the manufacturing apparatus 10 to the outside by a pusher (not shown). Furthermore, when the upper die 40 is at the top dead center, the lower surface 45B of the outer shape punching punch 45 is at the top dead center; when the upper die 40 is at the midpoint, the lower surface 45B of the outer shape punching punch 45 is at the midpoint; and when the upper die 40 is at the bottom dead center, the lower surface 45B of the outer shape punching punch 45 is at the bottom dead center.
[0027] As shown in Figure 1, the control device 90 controls the upper mold 40 and the lifting motor 36. The control device 90 includes, for example, a central processing unit (CPU) that executes instructions for the control program, a ROM that stores the program executed by the CPU, a RAM used as a working area for expanding the program, and a storage device such as memory that stores the program and various data. The control device 90 has an upper mold control unit 92 and a torque control unit 94. The functions of each part of the control device 90 are realized by a program. This program is downloaded, for example, via the internet. This program may also be read from a recording medium such as a CD or DVD. Furthermore, the functions of each part of the control device 90 may also be realized by a processor and / or circuits.
[0028] The upper die control unit 92 controls the vertical movement (movement in the vertical direction Z) of the upper die 40. In this embodiment, the upper die control unit 92 controls the vertical movement Z of the outer shape punching punch 45 and the stripper plate 60 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 distance from the lower die 20.
[0029] The torque control unit 94 controls the lifting motor 36. By controlling the lifting motor 36, the torque control unit 94 controls the vertical movement (movement in the vertical Z direction) of the mounting table 30. The torque control unit 94 controls the output torque of the lifting motor 36. The torque control unit 94 is provided so that the output torque of the lifting motor 36 can be changed. By changing the output torque, the back pressure applied to the iron core member 5 is changed. When the outer shape punching punch 45 does not punch out the metal plate W, the torque control unit 94 sets the output torque of the lifting motor 36 to a first output torque to suppress the pushing up of the iron core member 5 by the mounting table 30. When the outer shape punching punch 45 punches out the metal plate W to form the iron core member 5, the torque control unit 94 sets the output torque of the lifting motor 36 to a second output torque which is higher than the first output torque, so that back pressure is applied to the iron core member 5 by the mounting table 30. The first and second output torques are the output torques of the lifting motor 36 during the punching process (the process of punching out metal plates W to form the iron core members 5; for example, when the upper die 40 is moving up and down). In other words, the output torques of the lifting motor 36 when the laminated iron core 8 formed on the mounting table 30 is transported outside the manufacturing apparatus 10, or when the mounting table 30 is moved to its initial position, are not included in the first and second output torques.
[0030] The torque control unit 94 may be configured to change the first output torque. The torque control unit 94 may be configured to maintain the first output torque at a constant level. That is, the torque control unit 94 may be configured to make the first output torque unchangeable. The torque control unit 94 may be configured to change the second output torque. For example, the amount of change in the second output torque is greater than the amount of change in the first output torque. The torque control unit 94 may be configured to change the difference between the first output torque and the second output torque.
[0031] The torque control unit 94 may be configured to change the first output torque according to the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the iron core member 5. The torque control unit 94 may be configured to lower the first output torque as the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the iron core member 5 becomes smaller.
[0032] The torque control unit 94 may be configured to change the first output torque according to the thickness of the iron core member 5. The torque control unit 94 may be configured to lower the first output torque as the thickness of the iron core member 5 decreases.
[0033] The torque control unit 94 may be configured to change the first output torque according to the outer diameter of the iron core member 5. The torque control unit 94 may be configured to lower the first output torque as the outer diameter of the iron core member 5 decreases.
[0034] The torque control unit 94 may be configured to change the first output torque according to the number of crimped portions when crimping one iron core member 5. Crimping one iron core member 5 means stacking and crimping iron core members 5 formed by punching out metal plates W onto iron core members 5 already placed on the mounting base 30. The torque control unit 94 may be configured to lower the first output torque as the number of crimped portions decreases.
[0035] The torque control unit 94 may be configured to change the first output torque in accordance with the lateral pressure applied to the iron core member 5 by the squeeze ring 27. The torque control unit 94 may be configured to lower the first output torque as the lateral pressure decreases.
[0036] The torque control unit 94 may be configured to change the first output torque in accordance with the curvature of the core member 5 caused by the lateral pressure applied to the core member 5 by the squeeze ring 27. The torque control unit 94 may be configured to lower the first output torque as the curvature of the core member 5 decreases.
[0037] The torque control unit 94 may be configured to change the first output torque according to the shear resistance of the metal plate W when the outer punching punch 45 punches out the metal plate W. The torque control unit 94 may be configured to lower the first output torque as the shear resistance of the metal plate W decreases.
[0038] The torque control unit 94 may be configured to change the first output torque according to the weight of each core member 5. The torque control unit 94 may be configured to lower the first output torque as the weight of each core member 5 decreases.
[0039] The torque control unit 94 may be configured to change the second output torque according to the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the iron core member 5. The torque control unit 94 may be configured to increase the second output torque as the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the iron core member 5 increases.
[0040] The torque control unit 94 may be configured to change the second output torque based on the load detected by the sensor 38. The torque control unit 94 may be configured to change the second output torque based on the load detected by the outer shape punching punch 45 before the lower surface 45B of the outer shape punching punch 45 contacts the upper surface WT of the metal plate W (for example, before timing T4 in Figure 2). That is, the torque control unit 94 may be configured to change the second output torque of the core member 5 to be formed later based on the load when the core member 5 was formed earlier, before punching out the metal plate W to form the core member 5. The torque control unit 94 may be configured to change the second output torque based on the load detected by the sensor 38 while the metal plate W is being punched out by the outer shape punching punch 45 (for example, between timings T4 and T5 in Figure 2). That is, the torque control unit 94 may be configured to change the second output torque of the core member 5 to be formed later based on the load when the core member 5 was formed earlier, while the metal plate W is being punched out.
[0041] The torque control unit 94 may be configured to change the second output torque according to the thickness of the iron core member 5. The torque control unit 94 may be configured to increase the second output torque as the thickness of the iron core member 5 increases.
[0042] The torque control unit 94 may be configured to change the second output torque according to the outer diameter of the iron core member 5. The torque control unit 94 may be configured to increase the second output torque as the outer diameter of the iron core member 5 increases.
[0043] The torque control unit 94 may be configured to change the second output torque according to the number of crimped portions when crimping a single iron core member 5. The torque control unit 94 may be configured to increase the second output torque as the number of crimped portions increases.
[0044] The torque control unit 94 may be configured to change the second output torque in accordance with the lateral pressure applied to the iron core member 5 by the squeeze ring 27. The torque control unit 94 may be configured to increase the second output torque as the lateral pressure increases.
[0045] The torque control unit 94 may be configured to change the second output torque in accordance with the curvature of the core member 5 caused by the lateral pressure applied to the core member 5 by the squeeze ring 27. The torque control unit 94 may be configured to increase the second output torque as the curvature of the core member 5 increases.
[0046] The torque control unit 94 may be configured to change the second output torque according to the shear resistance of the metal plate W when the outer punching punch 45 punches out the metal plate W. The torque control unit 94 may be configured to increase the second output torque as the shear resistance of the metal plate W increases.
[0047] The torque control unit 94 changes the output torque of the lifting motor 36 from the first output torque to the second output torque. The torque control unit 94 holds the output torque of the lifting motor 36 at the second output torque for a predetermined time. In the example shown in Figure 2, the torque control unit 94 holds the output torque of the lifting motor 36 at the second output torque from timing T4 to timing T7.
[0048] The torque control unit 94 may change the output torque of the lifting motor 36 from the first output torque to the second output torque during the time when the lower surface 45B (see Figure 1) of the outer shape punching punch 45 passes the midpoint between the top dead center and the bottom dead center and reaches the bottom dead center (for example, timings T1 to T7 in Figure 2). The torque control unit 94 may also change the output torque of the lifting motor 36 from the first output torque to the second output torque during the time when the lower surface 45B of the outer shape punching punch 45 passes the midpoint and contacts the upper surface WB of the metal plate W (for example, timings T1 to T4 in Figure 2). The torque control unit 94 may also change the output torque of the lifting motor 36 from the first output torque to the second output torque when the lower surface 45B of the outer shape punching punch 45 contacts the upper surface WB of the metal plate W (for example, timing T4 in Figure 2). The torque control unit 94 may change the output torque of the lifting motor 36 from the first output torque to the second output torque between the time the stripper plate 60 contacts the upper surface WT of the metal plate W and the time the lower surface 45B of the punch 45 reaches the bottom dead center (for example, timings T3 to T7 in Figure 2). The torque control unit 94 may also change the output torque of the lifting motor 36 from the first output torque to the second output torque between the time the lower surface 45B of the punch 45 contacts the upper surface WT of the metal plate W and the time the iron core member 5 formed by punching out the metal plate W contacts the upper surface 5T of the iron core member 5 placed on the mounting table 30 (for example, timings T3 to T6 in Figure 2). The torque control unit 94 may change the output torque of the lifting motor 36 from the first output torque to the second output torque during the period from when the iron core member 5 formed by punching out the metal plate W begins to fall downward until the lower surface 45B of the punch 45 reaches the bottom dead center (for example, from timing T5 to timing T7 in Figure 2). The torque control unit 94 may also change the output torque of the lifting motor 36 from the first output torque to the second output torque during the period from when the iron core member 5 formed by punching out the metal plate W begins to fall downward until the formed iron core member 5 contacts the upper surface 5T of the iron core member 5 placed on the mounting table 30 (for example, from timing T5 to timing T6 in Figure 2).The torque control unit 94 may change the output torque of the lifting motor 36 from the first output torque to the second output torque during the period from when the iron core member 5 formed by punching out the metal plate W comes into contact with the upper surface 5T of the iron core member 5 placed on the mounting table 30 until the lower surface 45B of the punch 45 reaches the bottom dead center (for example, timing T6 to timing T7 in Figure 2). When changing the output torque of the lifting motor 36, a signal for changing the output torque is transmitted from the control device 90 to the lifting motor 36. Here, "changing the output torque of the lifting motor 36" includes the case in which the signal for changing the output torque is transmitted from the control device 90 to the lifting motor 36 before the timing for changing the output torque of the lifting motor 36, and the change in output torque is completed at the timing for changing the output torque of the lifting motor 36, and the case in which the signal for changing the output torque is transmitted from the control device 90 to the lifting motor 36 before the timing for changing the output torque of the lifting motor 36, and the change in output torque is still ongoing at the timing for changing the output torque of the lifting motor 36.
[0049] The timing at which the torque control unit 94 changes the output torque of the lifting motor 36 from the first output torque to the second output torque may be the same in the nth punching step, in which the metal plate W is punched out by the outer shape punching punch 45 to form the nth (n is a natural number) iron core member 5, and in the (n+1)th punching step, in which the metal plate W is punched out by the outer shape punching punch 45 to form the (n+1)th iron core member 5. For example, the timing at which the output torque is changed may be the same in the first punching step and the second punching step.
[0050] The torque control unit 94 may be configured to change the timing of changing the output torque of the lifting motor 36 from the first output torque to the second output torque. The torque control unit 94 may be configured to change the timing of changing the output torque of the lifting motor 36 from the first output torque to the second output torque earlier the higher the second output torque is. The torque control unit 94 may be configured to change the timing of changing the output torque of the lifting motor 36 from the first output torque to the second output torque earlier the larger the difference between the first output torque and the second output torque is. The torque control unit 94 may be configured to change the timing of changing the output torque of the lifting motor 36 from the first output torque to the second output torque earlier the thicker the metal plate W is.
[0051] The torque control unit 94 changes the output torque of the lifting motor 36 from the first output torque to the second output torque in a rectangular wave shape (see Figure 2). The torque control unit 94 may also gradually change the output torque of the lifting motor 36 from the first output torque to the second output torque. The torque control unit 94 may also change the output torque of the lifting motor 36 from the first output torque to the second output torque in a trapezoidal wave shape, sinusoidal wave shape, triangular wave shape, or sawtooth wave shape.
[0052] The torque control unit 94 changes the output torque of the lifting motor 36 from the second output torque to the first output torque. The torque control unit 94 holds the output torque of the lifting motor 36 at the first output torque for a predetermined time. In the example shown in Figure 2, the torque control unit 94 holds the output torque of the lifting motor 36 at the first output torque from timing T7 through timing T0 to timing T4.
[0053] The torque control unit 94 may change the output torque of the lifting motor 36 from the second output torque to the first output torque while the lower surface 45B (see Figure 1) of the outer punching punch 45 is moving from the bottom dead center to the midpoint (for example, between timing T7 and timing T10 in Figure 2). The torque control unit 94 may also change the output torque of the lifting motor 36 from the second output torque to the first output torque when the lower surface 45B (see Figure 1) of the outer punching punch 45 starts to rise from the bottom dead center (for example, at timing T7 in Figure 2).
[0054] The timing at which the torque control unit 94 changes the output torque of the lifting motor 36 from the second output torque to the first output torque may be the same in the nth punching step, in which the metal plate W is punched out by the outer shape punching punch 45 to form the nth (n is a natural number) iron core member 5, and in the (n+1)th punching step, in which the metal plate W is punched out by the outer shape punching punch 45 to form the (n+1)th iron core member 5. For example, the timing at which the output torque is changed may be the same in the first punching step and the second punching step.
[0055] The torque control unit 94 may be configured to change the timing for changing the output torque of the lifting motor 36 from the second output torque to the first output torque. The torque control unit 94 may be configured to delay the timing at which the change of the output torque of the lifting motor 36 from the second output torque to the first output torque is completed, as the lower the first output torque. The torque control unit 94 may be configured to delay the timing at which the change of the output torque of the lifting motor 36 from the second output torque to the first output torque is completed, as the difference between the first output torque and the second output torque is large.
[0056] The torque control unit 94 changes the output torque of the lifting motor 36 from the second output torque to the first output torque in a rectangular wave shape (see Figure 2). The torque control unit 94 may also gradually change the output torque of the lifting motor 36 from the second output torque to the first output torque. The torque control unit 94 may also change the output torque of the lifting motor 36 from the second output torque to the first output torque in a trapezoidal wave shape, sinusoidal wave shape, triangular wave shape, or sawtooth wave shape.
[0057] As described above, in the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 is configured to change the difference between the first output torque and the second output torque. According to the above configuration, the first output torque and the second output torque can be appropriately set according to the metal plate W and the core member 5 to be formed. Therefore, it is possible to apply appropriate back pressure when punching out the metal plate W to form the core member 5 while suppressing the occurrence of the core member 5 being pushed up on the mounting table 30.
[0058] In the laminated core manufacturing apparatus 10 of this embodiment, the amount of change in the second output torque may be greater than the amount of change in the first output torque. According to the above embodiment, the second output torque can be appropriately set according to the metal plate W and the formed core member 5.
[0059] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque and to maintain the first output torque at a constant value. According to the above embodiment, the second output torque can be appropriately set according to the metal plate W and the formed core member 5.
[0060] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the load applied from the outer punching punch 45 to the mounting table 30 when punching out the metal plate W to form the core member 5. According to the above embodiment, the second output torque can be appropriately set, so that appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0061] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the core member 5 increases. According to the above embodiment, appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0062] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque based on the load detected by the sensor 38. According to the above embodiment, the second output torque can be set more precisely.
[0063] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque based on the load detected by the sensor 38 before the lower surface 45B of the outer shape punching punch 45 contacts the upper surface WT of the metal plate W. According to the above embodiment, appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0064] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque based on the load detected by the sensor 38 while the metal plate W is being punched out by the outer shape punching punch 45. According to the above embodiment, appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0065] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the output torque of the lifting motor 36 from a first output torque to a second output torque between the lower surface 45B of the outer shape punching punch 45 when it passes the midpoint between the top dead center and the bottom dead center and reaches the bottom dead center. According to the above embodiment, the torque control unit 94 changes to the second output torque in the short time between when the lower surface 45B of the outer shape punching punch 45 passes the midpoint and reaches the bottom dead center, thereby suppressing the occurrence of the iron core member 5 placed on the mounting table 30 and applying appropriate back pressure when punching out the metal plate W to form the iron core member 5.
[0066] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may change the output torque of the lifting motor 36 from a first output torque to a second output torque between the time the lower surface 45B of the outer shape punching punch 45 passes the midpoint and the time it contacts the upper surface WT of the metal plate W. According to the above embodiment, back pressure can be applied at a more appropriate timing when punching out the metal plate W to form the core member 5.
[0067] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may change the output torque of the lifting motor 36 from a first output torque to a second output torque when the lower surface 45B of the outer shape punching punch 45 comes into contact with the upper surface WT of the metal plate W. According to the above embodiment, back pressure can be applied at a more appropriate timing when punching out the metal plate W to form the core member 5.
[0068] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the thickness of the core member 5. According to the above embodiment, the second output torque can be set more accurately.
[0069] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the thickness of the core member 5 increases. According to the above embodiment, a more appropriate back pressure can be applied when punching out the metal plate W to form the core member.
[0070] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the outer diameter of the core member 5. According to the above embodiment, the second output torque can be set more accurately.
[0071] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the outer diameter of the core member 5 increases. According to the above embodiment, a more appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0072] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the number of crimped portions when crimping one core member 5. According to the above embodiment, the second output torque can be set more accurately. In addition, the core members 5 can be properly joined together by crimping.
[0073] In the laminated core manufacturing apparatus 10 of this embodiment, the second output torque may be configured to be higher as the number of crimped portions increases. According to the above embodiment, more appropriate back pressure can be applied when punching out the metal plate W to form the core members 5. In addition, the core members 5 can be joined together more securely by crimping.
[0074] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the number of bonding points when bonding one core member 5. According to the above embodiment, the second output torque can be set more accurately. In addition, the core members 5 can be properly joined together by bonding.
[0075] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the number of bonding points increases. According to the above embodiment, more appropriate back pressure can be applied when punching out the metal plate W to form the core member 5. In addition, the core members 5 can be joined together more reliably by bonding.
[0076] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque in accordance with the lateral pressure applied to the core member 5 by the squeeze ring 27. According to the above embodiment, the second output torque can be set more accurately.
[0077] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the lateral pressure increases. According to the above embodiment, a more appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0078] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque in accordance with the warping of the core member 5 caused by the lateral pressure applied to the core member 5 by the squeeze ring 27. According to the above embodiment, the second output torque can be set more accurately.
[0079] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the curvature of the core member 5 increases. According to the above embodiment, a more appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0080] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the second output torque according to the shear resistance of the metal plate W when the outer shape punching punch 45 punches out the metal plate W. According to the above embodiment, the second output torque can be set more accurately.
[0081] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to increase the second output torque as the shear resistance of the metal plate W increases. According to the above embodiment, a more appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0082] Furthermore, in the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 is configured to change the first output torque. According to the above embodiment, the first output torque can be appropriately set according to the metal plate W and the core member 5 to be formed. Therefore, the occurrence of the core member 5 placed on the mounting table 30 being pushed up can be suppressed more reliably. In addition, by appropriately setting the second output torque, appropriate back pressure can be applied when punching out the metal plate W to form the core member 5.
[0083] In the laminated core manufacturing apparatus 10 of this embodiment, the first output torque may be configured to be changeable according to the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the core member 5. According to the above configuration, the first output torque can be appropriately set, so that the occurrence of the core member 5 placed on the mounting table 30 can be suppressed more reliably.
[0084] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the load applied from the outer shape punching punch 45 to the mounting table 30 when punching out the metal plate W to form the core member 5 becomes smaller. According to the above embodiment, the occurrence of the core member 5 placed on the mounting table 30 being pushed up can be appropriately suppressed.
[0085] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the output torque of the lifting motor 36 from a second output torque to a first output torque during the time when the lower surface 45B of the outer shape punching punch 45 reaches an intermediate point between the bottom dead center and the top dead center. According to the above embodiment, the torque control unit 94 changes to the first output torque in the short time it takes for the lower surface 45B of the outer shape punching punch 45 to reach an intermediate point from the bottom dead center. This makes it possible to apply appropriate back pressure when punching out the metal plate W to form the core member 5, while suppressing the occurrence of the core member 5 placed on the mounting table 30 being pushed up.
[0086] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may change the output torque of the lifting motor 36 from the second output torque to the first output torque when the lower surface 45B of the outer shape punching punch 45 starts to rise from the bottom dead center. According to the above embodiment, the occurrence of the iron core member 5 placed on the mounting table 30 being pushed up can be suppressed more reliably.
[0087] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the thickness of the core member 5. According to the above embodiment, the first output torque can be set more accurately.
[0088] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the thickness of the core member 5 decreases. According to the above embodiment, appropriate back pressure can be applied by the core member 5 placed on the mounting table 30, thereby suppressing the occurrence of the core member 5 being pushed up.
[0089] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the outer diameter of the core member 5. According to the above embodiment, the first output torque can be set more accurately.
[0090] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the outer diameter of the core member 5 decreases. According to the above embodiment, appropriate back pressure can be applied by the core member 5 placed on the mounting table 30, thereby suppressing the occurrence of the core member 5 being pushed up.
[0091] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the number of crimped portions when crimping one core member 5. According to the above embodiment, the first output torque can be set more accurately. In addition, the core members 5 can be properly joined together by crimping.
[0092] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the number of crimped portions decreases. According to the above embodiment, appropriate back pressure can be applied by the core members 5 placed on the mounting table 30. In addition, the core members 5 can be more securely joined to each other by crimping.
[0093] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the number of bonding points when bonding one core member 5. According to the above embodiment, the first output torque can be set more accurately. In addition, the core members 5 can be properly joined together by bonding.
[0094] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the number of bonding points decreases. According to the above embodiment, appropriate back pressure can be applied by the core members 5 placed on the mounting table 30. In addition, the core members 5 can be more reliably bonded to each other by adhesive.
[0095] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque in accordance with the lateral pressure applied to the core member 5 by the squeeze ring 27. According to the above embodiment, the first output torque can be set more accurately.
[0096] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the lateral pressure decreases. According to the above embodiment, appropriate back pressure can be applied by the core member 5 placed on the mounting table 30, thereby suppressing the occurrence of the core member 5 being pushed up.
[0097] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque in accordance with the warping of the core member 5 caused by the lateral pressure applied to the core member 5 by the squeeze ring 27. According to the above embodiment, the first output torque can be set more accurately.
[0098] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the curvature of the core member 5 decreases. According to the above embodiment, appropriate back pressure can be applied by the core member 5 placed on the mounting table 30, thereby suppressing the occurrence of the core member 5 being pushed up.
[0099] In the laminated iron core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the shear resistance of the metal plate W when the outer shape punching punch 45 punches out the metal plate W. According to the above embodiment, the first output torque can be set more accurately.
[0100] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the shear resistance of the metal plate W decreases. According to the above embodiment, appropriate back pressure can be applied by the core member 5 placed on the mounting table 30, thereby suppressing the occurrence of the core member 5 being pushed up.
[0101] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to change the first output torque according to the weight of each core member 5. According to the above embodiment, the first output torque can be set more accurately.
[0102] In the laminated core manufacturing apparatus 10 of this embodiment, the torque control unit 94 may be configured to lower the first output torque as the weight of each core member 5 decreases. According to the above embodiment, appropriate back pressure can be applied by the core members 5 placed on the mounting table 30, thereby suppressing the occurrence of the core members 5 being pushed up.
[0103] Preferred embodiments of the present invention have been described above. However, the embodiments described above are merely illustrative, and the present invention can be implemented in various other forms.
[0104] In the embodiment described above, the stacked core members 5 were joined together by crimping, but the method of joining is not limited to crimping. The stacked core members 5 may be joined together by welding, adhesive, or other means. When the stacked core members 5 are joined together by adhesive, the torque control unit 94 may be configured to change the first output torque according to the number of bonding points when bonding one core member 5. Bonding one core member 5 means stacking and bonding a core member 5 formed by punching out a metal plate W onto a core member 5 already placed on the mounting base 30. The torque control unit 94 may be configured to lower the first output torque as the number of bonding points decreases. The torque control unit 94 may also be configured to change the second output torque according to the number of bonding points when bonding one core member 5. The torque control unit 94 may be configured to increase the second output torque as the number of bonding points increases.
[0105] When the stacked iron core members 5 are bonded together by adhesive, the manufacturing apparatus 10 may include an adhesive application device for applying adhesive to the lower surface WL (see Figure 1) of the metal plate W. In this case, the control device 90 includes an application control unit for controlling the adhesive application device. The application control unit may control the adhesive application device to apply adhesive to the lower surface WL of the metal plate W for at least a portion of the period during which the torque control unit 94 sets the output torque of the lifting motor 36 to a second output torque.
[0106] In the embodiment described above, the lower mold body 21, die plate 22, and die 23 of the lower mold 20 are constructed as separate parts, but they may be constructed as an integral part as appropriate. For example, the die plate 22 and die 23 may be constructed as an integral part, or the die plate 22, die 23, and lower mold body 21 may be constructed as an integral part.
[0107] In the embodiment described above, 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 below the upper surface 22T of the die plate 22. In this case, the stripper plate 60 presses the strip-shaped metal plate W against the upper surface 22T of the die plate 22.
[0108] In the above-described embodiment, the manufacturing apparatus 10 was equipped with an outer shape punch 45 and an outer shape punch die hole 26, but it may further be equipped with an inner shape punch and an inner shape punch die hole, a pilot hole forming punch and a pilot hole forming die hole, and so on.
[0109] In a series of manufacturing steps from the start of punching out the first core member 5 to the discharge of the laminated core 8 to the outside of the manufacturing apparatus 10, the first output torque or the second output torque may be changed as described in the claims. Furthermore, in different manufacturing steps, the first output torque or the second output torque may be changed as described in the claims. [Explanation of symbols]
[0110] 5. Iron core member 8 Laminated Iron Core 10. Manufacturing equipment (Laminated iron core manufacturing equipment) 20 Lower mold 23 Die 26. Die hole for external punching (die hole) 27 Squeeze rings 30 Mounting platform 32 Support member 36 Lifting motor 38 sensors 40 Upper mold 45. Punch for cutting out external shapes (punch) 90 Control device 94 Torque Control Unit
Claims
1. A manufacturing apparatus for laminated iron cores in which multiple iron core members are stacked and interconnected, A lower mold having a die with a die hole formed therein, An upper die having a punch corresponding to the die hole, which punches out a strip of metal to form the iron core member, A mounting platform that is provided to be movable up and down, and on which the formed iron core members are sequentially placed, A support member that supports the aforementioned mounting platform so that it can be raised and lowered, A lifting motor for raising and lowering the aforementioned stand via the support member, The system includes a control device for controlling the upper mold and the lifting motor, The control device is The system includes a torque control unit configured to change the first output torque and change the timing of the change from the second output torque to the first output torque, wherein when the metal plate is not punched out by the punch, the output torque of the lifting motor is set to a first output torque to suppress the pushing up of the iron core member by the aforementioned support stand, and when the metal plate is punched out by the punch to form the iron core member, the output torque of the lifting motor is set to a second output torque higher than the first output torque to apply back pressure to the iron core member by the aforementioned support stand, and the system includes a torque control unit configured to change the first output torque and change the timing of the change from the second output torque to the first output torque. A manufacturing apparatus in which the torque control unit is configured such that the lower the first output torque, the later the timing at which the change of the output torque of the lifting motor from the second output torque to the first output torque is completed.
2. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to change the first output torque in accordance with the load applied from the punch to the base described above when punching out the metal plate to form the iron core member.
3. The manufacturing apparatus according to claim 2, wherein the torque control unit is configured to lower the first output torque as the load applied from the punch to the base described above when punching out the metal plate to form the iron core member becomes smaller.
4. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to change the first output torque according to the thickness of the iron core member.
5. The manufacturing apparatus according to claim 4, wherein the torque control unit is configured to lower the first output torque as the thickness of the iron core member decreases.
6. The laminated core is formed by the laminated core members being joined together by crimping. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to change the first output torque according to the number of crimped portions when crimping one iron core member.
7. The manufacturing apparatus according to claim 6, wherein the torque control unit is configured to lower the first output torque as the number of crimped portions decreases.
8. A squeeze ring is provided, positioned below the die, to hold the formed core member from the side and to apply lateral pressure to the core member. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to change the first output torque in accordance with the lateral pressure applied to the iron core member by the squeeze ring.
9. The manufacturing apparatus according to claim 8, wherein the torque control unit is configured to lower the first output torque as the side pressure decreases.
10. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to change the first output torque according to the shear resistance of the metal plate when the metal plate is punched out by the punch.
11. The manufacturing apparatus according to claim 10, wherein the torque control unit is configured to lower the first output torque as the shear resistance of the metal plate decreases.
12. The manufacturing apparatus according to claim 1, wherein the torque control unit is configured to set one of the second output torques.
13. A manufacturing apparatus for laminated iron cores in which multiple iron core members are stacked and interconnected, A lower mold having a die with a die hole formed therein, An upper die having a punch corresponding to the die hole, which punches out a strip of metal to form the iron core member, A mounting platform that is provided to be movable up and down, and on which the formed iron core members are sequentially placed, A support member that supports the aforementioned mounting platform so that it can be raised and lowered, A lifting motor for raising and lowering the aforementioned stand via the support member, The system includes a control device for controlling the upper mold and the lifting motor, The control device is The system includes a torque control unit configured to change the first output torque and change the timing of the change from the second output torque to the first output torque, wherein when the metal plate is not punched out by the punch, the output torque of the lifting motor is set to a first output torque to suppress the pushing up of the iron core member by the aforementioned support stand, and when the metal plate is punched out by the punch to form the iron core member, the output torque of the lifting motor is set to a second output torque higher than the first output torque to apply back pressure to the iron core member by the aforementioned support stand, and the system includes a torque control unit configured to change the first output torque and change the timing of the change from the second output torque to the first output torque. A manufacturing apparatus in which the torque control unit is configured to delay the timing at which the change of the output torque of the lifting motor from the second output torque to the first output torque is completed, as the difference between the first output torque and the second output torque becomes larger.
14. The manufacturing apparatus according to claim 13, wherein the torque control unit is configured to change the output torque of the lifting motor from the second output torque to the first output torque when the lower surface of the punch moves from the bottom dead center to an intermediate point between the bottom dead center and the top dead center.
15. The manufacturing apparatus according to claim 14, wherein the torque control unit changes the output torque of the lifting motor from the second output torque to the first output torque when the lower surface of the punch starts to rise from the bottom dead center.
16. The manufacturing apparatus according to claim 13, wherein the torque control unit is configured to change the first output torque according to the outer diameter of the iron core member.
17. The manufacturing apparatus according to claim 16, wherein the torque control unit is configured to lower the first output torque as the outer diameter of the iron core member decreases.
18. The laminated core is formed in which the laminated core members are bonded together by adhesive. The manufacturing apparatus according to claim 13, wherein the torque control unit is configured to change the first output torque according to the number of bonding locations when bonding one iron core member.
19. The manufacturing apparatus according to claim 18, wherein the torque control unit is configured to lower the first output torque as the number of bonding locations decreases.
20. A squeeze ring is provided, positioned below the die, to hold the formed core member from the side and to apply lateral pressure to the core member. The manufacturing apparatus according to claim 13, wherein the torque control unit is configured to change the first output torque in accordance with the warping of the core member caused by the lateral pressure applied to the core member by the squeeze ring.
21. The manufacturing apparatus according to claim 20, wherein the torque control unit is configured to lower the first output torque as the curvature of the iron core member decreases.
22. The manufacturing apparatus according to claim 13, wherein the torque control unit is configured to change the first output torque according to the weight of each of the iron core members.
23. The manufacturing apparatus according to claim 22, wherein the torque control unit is configured to lower the first output torque as the weight of each iron core member decreases.