JP2013090386A - Method of manufacturing core for dynamo-electric machine, and core plate punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a core for a dynamo-electric machine and a core plate punching device, whereby the core plate can be accurately positioned and laminated on the adjoining core plate in the laminating direction when punching out the core plate with the end fringe parts of a magnet holding hole on the outer peripheral side and the inner peripheral side of the core plate separated from each other.SOLUTION: Core plates 12, 13 having magnet holding holes 15 are punched from a strip-shaped work W by a die 22 and a punch 23, and the core plates 12, 13 are laminated to manufacture the core for the dynamo-electric machine. When punching the core plates 12, 13, prior to punching, the inside fringe part of the magnet holding hole 15 on the outer peripheral side of the core plate is pressed down by a pressing part 26 provided in the punch 23. Simultaneously with punching of the core plates 12, 13, the outside portion of the magnet holding hole 15 is conjoined to the outside portions of the core plates 12, 13 adjoining in the laminated direction at a dowel 18 by a protrusion 27 provided in the punch 23.

Description

  The present invention is a method for manufacturing a rotating electrical machine core for manufacturing a rotating electrical machine core such as a rotor core by punching a core plate in which a magnet holding hole is formed from a strip-shaped workpiece and laminating the core plate, The present invention also relates to a punching device for a core plate of a core for a rotating electrical machine.

  Conventionally, as a core for a rotating electrical machine formed by laminating a plurality of core plates provided with this type of magnet holding hole, for example, a configuration disclosed in Patent Document 1 has been proposed. In this conventional configuration, the rotor core is configured by alternately laminating integral core plates and split core plates. A plurality of magnet holding holes are formed in the outer peripheral portion of the integral core plate. A magnet holding hole is formed between the core plate main body and the divided portion by providing the divided core plate with a divided portion separated from the outer peripheral portion thereof. Then, in the state in which the integral core plates and the divided core plates are alternately stacked, rivets are inserted into the plurality of through holes on the core plates, and the rivets are caulked, whereby each core plate Is fixed in a laminated state. If the division part is formed in this way, the outer peripheral part of the magnet holding hole is cut off and opened, thereby dividing the magnetic path and reducing magnetic flux leakage.

JP 2006-158008 A

  When the core for a rotating electrical machine as described above is assembled, it is necessary to position and separate the separated divided portions at predetermined positions on another core plate adjacent in the stacking direction. However, Patent Document 1 does not disclose in detail a manufacturing method related to stacking the core plates. Therefore, in the core described in Patent Document 1, it is difficult to stack the divided portions of the core plate so as to have an accurate positional relationship with respect to the other core plates.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide a method of manufacturing a core for a rotating electrical machine that can accurately position and stack a core plate on another core plate adjacent in the stacking direction, even if the core plate is divided. The object is to provide a punching device for a core plate.

  In order to achieve the above object, in an invention relating to a method for manufacturing a core for a rotating electrical machine, a core plate in which a magnet holding hole is formed is punched from a plate-shaped workpiece, and the core plate is laminated to form a core for a rotating electrical machine. In the manufacturing method of the core for a rotating electrical machine for manufacturing, the inner edge of the magnet holding hole on the outer peripheral side of the core plate is pressed, and the core plate is punched in that state.

  Therefore, in the method for manufacturing a core for a rotating electrical machine according to the present invention, when the core plate is punched and formed in a state where the outer peripheral side and the inner peripheral side of the magnet holding hole are separated, the core of the magnet holding hole The core plate is punched in a state where the inner edge on the outer peripheral side of the plate is pressed. For this reason, even if the core plate is in a divided state by providing the magnet holding hole, it is possible to suppress the risk of the core plate moving, and other cores adjacent to the core plate in the stacking direction can be suppressed. It can be positioned and laminated easily and accurately on the plate.

In the manufacturing method, it is preferable that the inner edge of the magnet holding hole whose end is separated and whose end is opened is pressed.
In the above method, it is preferable that the outer portion of the magnet holding hole is joined to the outer portion of another core plate adjacent in the stacking direction by dowels simultaneously with the punching of the core plate.

In the above method, it is preferable that the end of the magnet holding hole is separated to form a split portion on the outer portion of the core plate, and the split portion is coupled to another core plate by a dowel.
In the invention related to the punching device for the core, in the punching device for the core plate of the core for a rotating electrical machine provided with the die and punch for punching the core plate from the plate-like workpiece, the punch precedes the punching of the core plate. The magnet holding hole formed in the workpiece is provided with a pressing portion for pressing the inner edge of the outer peripheral side of the core plate.

  Therefore, also in this invention, the core plate was punched out in a state where the inner edge of the magnet holding hole on the outer peripheral side of the core plate was pressed, and the core plate was in a state of being divided through the magnet holding hole. Even so, the possibility of the core plate moving can be suppressed, and the core plate can be easily and accurately positioned and stacked on another core plate adjacent in the stacking direction.

  In the above configuration, the punch may be provided with a pressing portion for pressing a dowel on the outer portion of the magnet holding hole, and the outer portion of the core plate adjacent in the stacking direction may be coupled by the dowel.

  As described above, according to the present invention, even if the edge portion of the magnet holding hole on the outer peripheral side or inner peripheral side of the core plate is separated and the divided portion is formed on the core plate, the core The effect that the plate can be accurately positioned and stacked on another core plate adjacent in the stacking direction is exhibited.

The perspective view which shows the core for rotary electric machines manufactured by the manufacturing method of the core for rotary electric machines of 1st Embodiment. The top view of the core for rotary electric machines of FIG. The perspective view which decomposes | disassembles and shows the two core boards in the core for rotary electric machines of FIG. The top view which shows in order the station in the manufacturing method of the core for same rotary electric machines. Sectional drawing which shows the punching apparatus of the punching process of the core board in the station of FIG. The fragmentary sectional view in the 5-5 line | wire of FIG. The simplified diagram which shows the pressing part of a punch. The simplification figure which shows the example from which the press part of a punch differs. (A)-(e) is a partial top view which shows the pattern from which the magnet holding hole differs in the core for rotary electric machines manufactured by the manufacturing method of 2nd Embodiment. The schematic plan view which shows the core board of the core for rotary electric machines which arranged the magnet holding hole of the pattern of FIG.

(First embodiment)
A first embodiment of a method for manufacturing a core for a rotating electrical machine and a core plate punching apparatus embodying the present invention will be described below with reference to FIGS.

First, the configuration of the rotor core of a motor as a rotating electrical machine manufactured by the manufacturing method of this embodiment will be described.
As shown in FIGS. 1 and 3, the rotor core 11 is configured by alternately stacking a predetermined number of first core plates 12 and second core plates 13 (for example, 100 in total). Although the first core plate 12 and the second core plate 13 have the same configuration, since the directions in the core circumferential direction are different, in this embodiment, they are treated as different core plates for convenience. A through hole 14 is formed in the center of the first core plate 12 and the second core plate 13 for fitting a rotation shaft of a motor (not shown). A plurality of pairs of magnet holding holes 15 for inserting the permanent magnets 31 shown in FIG. 2 are formed on the outer peripheral edges of the first core plate 12 and the second core plate 13 at predetermined angular intervals. Has been. In this embodiment, it is assumed that eight sets of magnet holding holes 15 are formed at intervals of 45 degrees.

  In the first core plate 12 and the second core plate 13, an outer peripheral side separation portion 16 is formed at the end portion on the outer peripheral side of the core plate of a pair of magnet holding holes 15 arranged every other pair, and the magnet is held. An inner peripheral side separating portion 17 is formed between the end edges of the hole 15 on the inner peripheral side of the core plate. And the 1st core board 12 and the 2nd core board 13 are comprised so that the formation location of the outer peripheral side isolation | separation part 16 and the inner peripheral side isolation | separation part 17 may become a different position in a core circumferential direction. That is, the magnet holding hole 15 of the 1st pattern A of the form which the edge part of the core board outer peripheral side and inner peripheral side of the magnet holding hole 15 was isolate | separated by the separation parts 16 and 17, and the core board outer periphery of the magnet holding hole 15 The magnet holding holes 15 of the second pattern B in a form in which the edge portions on the side and inner peripheral side are closed are alternately arranged in the circumferential direction of the core plates 12 and 13, and the core plates 12 and 13. Are also arranged alternately in the stacking direction. In the first pattern A, a split portion 19 that is separate from the core plate body is formed outside the magnet holding hole 15.

  As shown in FIGS. 1, 3, and 5, a plurality of dowels 18 are formed on each core plate 12, 13 in the outer portion of each of the pair of magnet holding holes 15. By fitting together, the core plates 12 and 13 are coupled and fixed in a laminated state, and the rotor core 11 is assembled. In the assembled state of the rotor core 11, the magnetic flux leakage from the outer peripheral side and the inner peripheral side of the core holding hole 15 is reduced by the arrangement of the separating portions 16 and 17. In addition, the strength of the core 11 is ensured by the arrangement of the magnet holding holes 15 of the second pattern B in a form in which the edge portions on the outer peripheral side and the inner peripheral side of the core holding hole 15 are closed.

  Next, a core plate punching device used in a fourth station S4 described later will be described. As shown in FIG. 5, in this punching device, a cylindrical holding member 21 is provided so as to be rotatable about one vertical axis. The holding member 21 is intermittently rotated by 45 degrees by a motor (not shown) for the purpose of rollover described later. An annular die 22 is fixed to the inner peripheral upper end edge of the holding member 21. A punch 23 is disposed above the die 22 so as to be able to reciprocate along a vertical axis. Then, the core plates 12 and 13 are punched from the workpiece W by the punch 23 being reciprocated in the vertical direction with respect to the die 22 in a state where the strip-shaped workpiece W is disposed on the holding member 21. .

  A cylindrical pressing ring 24 for applying pressure to the outer peripheral surfaces of the punched core plates 12 and 13 is fixed to the inner periphery of the holding member 21 below the die 22. In the shaft hole of the die 22, the pressing ring 24 and the holding member 21, a mounting table 25 that can rotate around the vertical axis is provided so as to be movable up and down along the vertical axis. Then, the core plates 12 and 13 punched out by the punch 23 and the die 22 are placed on the placing table 25 while being pressed and held from the outer periphery by the pressing ring 24 and are sequentially stacked. At this time, the holding member 21 is rotated by a motor (not shown), the die 22 and the pressing ring 24 are rotated by 45 degrees integrally with the holding member 21, and the core plates 12 and 13 on the mounting table 25 are mounted on the mounting table. 25 and follow-up rotation. Therefore, since the workpiece W on the holding member 21 is in a stationary state without being rotated, the punched core plates 12 and 13 are stacked with the rotation angle shifted by 45 degrees as a result, and are so-called rolled. Thus, the rotor core 11 is formed.

  As shown in FIGS. 5, 6, and 7, a pair of pressing portions 26 respectively correspond to the magnet holding holes 15 of the first pattern A on the workpiece W at the peripheral edge portion of the lower end surface of the punch 23. And projecting at an angular interval of 90 degrees. When the punch 23 is lowered, prior to punching of the core plates 12 and 13 by the punch 23 and the die 22, the inner edge of the magnet holding hole 15 of the first pattern A on the outer peripheral side of the magnet holding hole 15 of the first pattern A is made. Pressed and held. At this time, the entire outer periphery of the core plates 12 and 13 is held by the die 22. For this reason, even if the division part 19 is formed outside the magnet holding hole 15 of the first pattern A by punching the core plates 12 and 13 immediately after that, the movement of the division part 19 is prevented and the division part 19 The core plates 12 and 13 including 19 are accurately positioned and stacked on the adjacent core plates 12 and 13 below in the stacking direction.

  On the peripheral edge of the lower end surface of the punch 23, a plurality of protrusions 27 as pressing portions are formed at intervals of 45 degrees. Simultaneously with punching of the core plates 12 and 13 by the punch 23 and the die 22, the dowels 18 on the core plates 12 and 13 are moved to the dowels 18 on the core plates 12 and 13 adjacent to the lower side in the stacking direction by the protrusions 27. On the other hand, the core plates 12 and 13 are coupled and fixed in a laminated state by being crimped by pressing.

  Next, a manufacturing method for manufacturing the rotor core 11 configured as described above will be described. As shown in FIG. 4, different processes are sequentially performed on the workpiece W in the first to fourth stations S <b> 1 to S <b> 4 while the strip-shaped workpiece W is intermittently transferred by a predetermined distance in the longitudinal direction indicated by the arrow. Applied. In this case, on the workpiece W, a through hole 14 for fitting the rotation shaft is formed in advance in a station (not shown) of the first station S1.

  That is, in accordance with the intermittent movement of the workpiece W, in the first station S1, a pair of outer peripheral side separation portions 16 constituting the magnet holding holes 15 of the first pattern A and the inner portions of the through holes 14 on the workpiece W are provided. A set of the circumferential side separating portions 17 is punched and formed at an angular interval of 90 degrees. In the next second station S2, a pair of magnet holding holes 15 constituting the first and second patterns A and B are formed at an angular interval of 45 degrees at the peripheral edge of the through hole 14 on the workpiece W, respectively. Is done. That is, the first pattern A in which both end edges of the magnet holding hole 15 are separated by the separating parts 16 and 17 and the second pattern B in which both end edges of the magnet holding hole 15 are closed are circular. They are alternately arranged in the circumferential direction.

  In the subsequent third station S3, dowels 18 are formed on the outer portions of the pair of magnet holding holes 15 of the first and second patterns A and B on the workpiece W. The formation of the dowel 18 may be performed simultaneously with the punching of the magnet holding hole 15 in the first station S1 or the second station S2, or may be performed at a station preceding the first station S1.

  Further, in the fourth station S4, the core plates 12 and 13 are punched from the workpiece W by the punching device, and the core plates 12 and 13 are sequentially stacked while the mounting table 25 is lowered. In this case, the punched core plates 12 and 13 are rolled while being rotated by 45 degrees with respect to the core plates 12 and 13 immediately below, so that the first pattern A and the second pattern B are core plates. 12 and 13 are alternately arranged in the stacking direction. When the core plates 12 and 13 are punched and laminated, the dowels 18 are caulked, whereby the core plates 12 and 13 are coupled and fixed in a laminated state, and the rotor core 11 is manufactured.

  Here, a through hole (not shown) is punched in the first stage of the first station S1 at the position of the dowel 18 of the first core plate 12 or 13 of the set number of sheets so that the set number of rotor cores 11 becomes the set number. It is. Accordingly, the dowels 18 of the second core plate 12 or 13 are fitted into the through holes of the first core plate 12 or 13, and the core plates 12 or 13 are connected to each other. Or 13 is not connected with the core board 12 or 13 punched before that. In this way, a set number of rotor cores 11 are secured.

  As shown in FIG. 2, when a predetermined number of core plates 12 and 13 are stacked and the core 11 is formed, the mounting table 25 is greatly lowered and moved below the fourth station S4. From there, it is transported to another process in the subsequent stage. In this subsequent step, the permanent magnet 31 is accommodated in the magnet holding hole 15, and the permanent magnet 31 is fixed in the accommodated state by a synthetic resin 32 such as an epoxy resin. Furthermore, if necessary, end plates (not shown) having no magnet holding holes are laminated and fixed on both end faces of the core 11 in the laminating direction.

  As described above, the core 11 including the predetermined number of core plates 12 and 13 is assembled. And as for this core 11, since the outer periphery and inner periphery of the magnet holding hole 15 of the half of the magnet holding hole 15 of each core board 12 and 13 are isolate | separated and cut off as mentioned above, leakage magnetic flux can be reduced. . Therefore, when this core 11 is used as a rotor core, the motor can be operated efficiently and torque characteristics can be improved. In addition, since the magnet holding holes 15 of the first pattern A and the magnet holding holes 15 of the second pattern B are alternately arranged, the divided portions 19 of the first pattern A are adjacent to each other in the stacking direction via the dowels 18. The other core plates 12 and 13 are fixed to undivided portions. Therefore, the strength of the core 11 as a whole can be ensured.

  In the manufacturing method, the core 11 is assembled by rolling the core plates 12 and 13. However, the core 11 can be assembled without rolling the core plates 12 and 13. In this case, in the step before punching and laminating the core plates 12 and 13, it is necessary to punch so that the magnet holding holes 15 of the first and second patterns A and B are formed at different positions by 45 degrees. There is. In this case, since the first and second patterns A and B appear alternately at the position of the magnet holding hole 15, both the first and second patterns A and B of the punch 23 as shown in FIG. It is necessary to provide the pressing portion 26 at a position corresponding to the above.

  Furthermore, the magnet holding holes 15 are formed at angles different from the above, for example, every 30 degrees or 20 degrees, the number of the first patterns A and the number of the second patterns B are different, The core plate excluding the core plates at both ends may be a core plate of only the first pattern A, or a predetermined number of first patterns A and second patterns B may appear continuously in the stacking direction at the same angular position of the core 11. It is possible to make various changes. In these cases, according to the change, an intermittent rotation angle for transposition, an arrangement pattern of the pressing portions 26 of the punch 23, and the like are appropriately set. In any of these cases, since the pressing portion 26 presses the inner edge of the magnet holding hole 15 on the outer peripheral side, even if the divided portion 19 is formed by the magnet holding hole 15, the core plates 12 and 13 are the other. The core plates 12 and 13 are appropriately laminated with an accurate positional relationship.

Therefore, according to this embodiment, the following effects can be obtained.
(1) In this embodiment, the core plates 12 and 13 having the magnet holding holes 15 are punched from the strip-shaped workpiece W by the die 22 and the punch 23, and the core plates 12 and 13 are laminated to form a rotor core. 11 is manufactured. When the core plates 12 and 13 are punched, the inner edge of the magnet holding hole 15 on the outer peripheral side of the magnet holding hole 15 is pressed by the pressing portion 26 provided in the punch 23 prior to the punching.

  For this reason, when punching and forming the core plates 12 and 13 in a state where the outer peripheral side or inner peripheral side edge of the magnet holding hole 15 is separated, the inner edge of the magnet holding hole 15 on the outer peripheral side of the core plate The core plates 12 and 13 are punched in a state where is held. Therefore, even when the split portions 19 are formed in the core plates 12 and 13 by the magnet holding holes 15 when the core plates 12 and 13 are punched, it is possible to prevent the split portions 19 from moving. Thus, the core plates 12 and 13 can be easily and accurately positioned and stacked on the other core plates 13 and 12 adjacent in the stacking direction. For this reason, a highly efficient motor with good torque characteristics and the like can be obtained.

  (2) In this embodiment, simultaneously with the punching of the core plates 12 and 13, the dowel 18 is pressed by the protrusion 27 provided on the punch 23, and the outer portion of the magnet holding hole 15 is adjacent in the stacking direction. Are coupled to the outer portions of the core plates 13, 12. For this reason, when the separated core plates 12 and 13 are punched, the core plates 12 and 13 can be immediately coupled and fixed in a stacked state on the core plates 13 and 12 adjacent in the stacking direction. Therefore, the division part 19 of the core plates 12 and 13 in the separated state can be prevented from moving in the laminated state.

  (3) In this embodiment, when the core plates 12 and 13 are punched and stacked, the first pattern A in a form in which the edge portions on the outer peripheral side and the inner peripheral side of the magnet holding hole 15 are separated is formed on the core 11. Be placed. For this reason, magnetic flux leakage from the outer peripheral side and inner peripheral side edge portions of the magnet holding hole 15 is reduced, and the connection strength of the outer peripheral side and inner peripheral side edge portions of the magnet holding hole 15 is reduced. Can be obtained.

(Second Embodiment)
Next, a second embodiment of a method for manufacturing a rotating electrical machine core embodying the present invention will be described with reference to FIGS. 9 (a) to 9 (e) and FIG. 10, focusing on the differences from the first embodiment.

  In this 2nd Embodiment, as shown to Fig.9 (a)-(e), five forms from which the separation or closing shape in the edge part of the core board outer peripheral side of the magnet holding hole 15 and an inner peripheral side differed were different. The magnet holding holes 15 having the patterns C to G are prepared. That is, as shown in FIG. 9A, in the magnet holding hole 15 of the pattern C, the outer peripheral side edge of one magnet holding hole 15 and the inner peripheral side edge of the pair of magnet holding holes 15 are separated. At the same time, the outer peripheral edge of the other magnet holding hole 15 is closed. As shown in FIG. 9B, in the magnet holding hole 15 of the pattern D, the outer peripheral side edge of the other magnet holding hole 15 and the inner peripheral side edge of the pair of magnet holding holes 15 are separated. At the same time, the outer peripheral edge of one magnet holding hole 15 is closed.

  As shown in FIG. 9C, in the magnet holding holes 15 of the pattern E, the inner peripheral side edge portions of the pair of magnet holding holes 15 are separated and the outer peripheral side edges of the pair of magnet holding holes 15. Department is closed. As shown in FIG. 9D, in the magnet holding holes 15 of the pattern F, the outer peripheral side edge portions of the pair of magnet holding holes 15 are separated and the inner peripheral side edge portions of the pair of magnet holding holes 15 are separated. Are connected and closed. As shown in FIG. 9E, in the magnet holding hole 15 of the pattern G, the outer peripheral side edge and the inner peripheral side edge of the pair of magnet holding holes 15 are closed.

  For example, as shown in FIG. 10, two groups of magnet holding holes 15 having the patterns C to G in the five forms are arranged on the core plate 12 in order in the circumferential direction. Further, when the core plate 12 is punched, the core plate 12 is rolled in multiples of 36 degrees excluding 360 degrees, so that magnet holding holes having different patterns C to G between the adjacent core plates 12 in the stacking direction. 15 is superposed. A combination of these patterns C to G is appropriately selected according to the required strength and characteristics of the core 11.

  When punching with the die 22 and the punch 23, the outer peripheral side edge portion of the magnet holding hole 15 is pressed by the pressing portion 26 of the punch 23, as in the first embodiment. In the patterns E and G shown in FIGS. 9C and 9E, the outer peripheral side end of the magnet holding hole 15 is closed and connected, so that the pressing by the pressing portion 26 is not particularly required.

Therefore, according to the fourth embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.
(4) In this method for manufacturing a core for a rotating electrical machine, a plurality of patterns C to G having different separation shapes or closing shapes at the outer peripheral side or inner peripheral side edge of the core plate of the magnet holding hole 15 are prepared. . For this reason, required intensity | strength and a characteristic can be acquired as the core 11 by combining these patterns C-G suitably. Even if the shape of the magnet holding hole 15 is two or more kinds of shapes, only one portion of the magnet holding hole 15 is closed as shown in FIGS. 9A, 9B, and 9D, for example. The core plate 12 is laminated with respect to the other core plates 12 in an accurate positional relationship by holding the edge portion of the magnet holding hole 15 by the pressing portion 26 even if the connected unstable shape is easy to move. be able to.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
In the embodiment, a pair of flat permanent magnets 31 are arranged in a substantially flat V-shape in the pair of magnet holding holes 15, but as shown by a two-dot chain line in FIG. The magnet holding holes 15 are formed in an arc shape, and one arc-shaped permanent magnet 31 is arranged.

  -Instead of the dowel 18, a hole communicating with each core plate in the stacking direction is formed, and in the stacked state of the core plate, a synthetic resin for core plate bonding is injected into the hole.

  DESCRIPTION OF SYMBOLS 11 ... Core, 12 ... 1st core board, 13 ... 2nd core board, 15 ... Magnet holding hole, 16 ... Outer peripheral side separation part, 17 ... Inner peripheral side separation part, 18 ... Dowel, 19 ... Dividing part, 22 ... Die, 23 ... Punch, 26 ... Presser, 27 ... Protrusion, W ... Workpiece.

Claims (6)

In a method for manufacturing a rotating electrical machine core for punching a core plate in which a magnet holding hole is formed from a plate-shaped workpiece, and stacking the core plates to manufacture a rotating electrical machine core,
A method for manufacturing a core for a rotating electrical machine, wherein the inner edge of the magnet holding hole on the outer peripheral side of the core plate is pressed and the core plate is punched out in that state. 2. The method for manufacturing a core for a rotating electrical machine according to claim 1, wherein the inner edge of the magnet holding hole whose end is separated and the end is opened is pressed down. 3. The rotating electrical machine according to claim 1, wherein an outer portion of the magnet holding hole is coupled to an outer portion of another core plate adjacent in the stacking direction by dowels simultaneously with the punching of the core plate. Manufacturing method for cores. The rotation according to claim 3, wherein the end of the magnet holding hole is separated to form a divided portion in an outer portion of the core plate, and the divided portion is coupled to another core plate by a dowel. A method for manufacturing an electric core. In a punching device for a core plate of a core for a rotating electrical machine provided with a die and a punch for punching a core plate from a plate-shaped workpiece,
Prior to punching of the core plate, the punch is provided with a pressing portion for pressing the inner edge portion of the core holding plate outer peripheral side of the magnet holding hole formed in the workpiece. Core plate punching device. 6. The punch is provided with a pressing portion for pressing a dowel in an outer portion of the magnet holding hole, and the outer portion of the core plate adjacent in the stacking direction is coupled by the dowel. A punching device for a core plate of a core for a rotating electric machine according to claim 1.

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