JP5814304B2 - Laminated iron core manufacturing apparatus and laminated iron core manufacturing method - Google Patents

Description

  The present invention relates to a laminated core manufacturing apparatus in which a plurality of iron core thin plates are stacked and a method for manufacturing a laminated core.

  2. Description of the Related Art Conventionally, a method of manufacturing a laminated iron core for a rotating electrical machine by using a progressive die apparatus using a hoop material (strip-shaped thin steel plate) of an electromagnetic steel plate as a raw material has been widespread. In the progressive die device, the core sheet is continuously formed by sequentially punching the hoop material such as pilot holes, slots, and teeth, and finally the core sheet with the outer shape punched is specified. A laminated iron core is manufactured by laminating and fixing the number of sheets. As a method for fixing an iron core thin plate, a so-called laminated caulking method is known in which irregularities for caulking are formed on each iron thin plate, and crimped and bonded together at the time of lamination.

  In this laminating caulking method, using a punch and a die, a measuring hole consisting of a through hole is formed for the iron core thin plate corresponding to the lowermost layer of the laminated iron core, and for iron core thin plates other than the lowermost layer. A cut-and-raised portion (caulking projection) is formed which includes a concave portion formed on one surface and a convex portion formed on the other surface corresponding to the concave portion. In the laminated core manufacturing apparatus using the laminated caulking method, the measuring punch for forming the measuring hole is provided with a switching mechanism (such as a cam mechanism) for switching between performing and not performing punching. The raising punch may not be provided with a switching mechanism from the viewpoint of preventing the apparatus structure from becoming complicated and reducing the apparatus cost.

  In such a case, since the punching operation by the punch is performed for the iron core thin plate corresponding to the lowermost layer, the punch and punch is inserted into the measuring hole formed in the previous process. However, this insertion may generate burrs at the periphery of the measurement hole. Therefore, for example, a step of forming a cut-and-raised portion with respect to the iron core thin plate and a step of forming a measuring hole having a smaller diameter than the convex portion in the cut-and-raised portion, the step of forming the measuring hole being cut and raised. A method of manufacturing a laminated core that is performed prior to the step of forming the ridge is known (see Patent Document 1).

JP 2007-14122 A

  By the way, in the prior art described in the above-mentioned patent document 1, since a cut-and-raised portion is formed by a larger-diameter cut-and-punch with respect to a small-diameter measurement hole, burrs are formed on the inner peripheral surface of the measurement hole. However, since the generated burr is accommodated in the measuring hole, there is an advantage that the burr does not affect the other surface (the surface opposite to the surface into which the cut and raised punch is inserted).

  However, if the burr as described above falls off the iron core thin plate, it may adversely affect the operation of the rotating electrical machine. In this case, the cutting and raising punch is provided with a cam mechanism similar to that of the measuring punch, thereby avoiding insertion of the cutting and raising punch into the measuring hole (that is, the punch for the iron core thin plate corresponding to the lowermost layer). It is conceivable that the operation is not performed), but there is a problem that the apparatus becomes complicated and the apparatus cost increases. Therefore, it is desirable to suppress the occurrence of burrs in such a measuring hole with a simple configuration.

  The present invention has been devised in view of such problems of the prior art, and has a simple structure, and can produce a laminated iron core that can suppress the occurrence of burrs in a measuring hole due to insertion of a cut and raised punch. The main object is to provide an apparatus and a method for manufacturing a laminated core.

  In the first aspect of the present invention, a laminated iron core is manufactured by punching out an iron core thin plate (20) from a strip-like thin steel plate (W) that is intermittently transferred and laminating a plurality of the iron core thin plates by caulking. In the manufacturing apparatus (1), by selectively executing a punching operation according to the intermittent transfer, only the lowermost core thin plate (20B) corresponding to the lowermost layer of the laminated core is used for caulking and bonding. By measuring the hole forming portion (30) provided with the measuring punch (P2) for forming the measuring hole (k1), which is a through hole, and the punching operation according to the intermittent transfer at all times, the lowermost iron core thin plate A cut-and-raised forming part (P4) provided with a cut-and-raised punch (P4) for forming a raised part (k2) that is an unevenness for caulking coupling at a position corresponding to the measuring hole in the other iron core thin plate than 35) H has a chamfered portion (52a, 52b, 54a, 54b, 62a, 62b, 63a, 63b, 72a, 72b, 82a, 82b, 83a, 83b) formed on at least a part of the outer peripheral edge of the blade edge portion. In addition, the lowermost core thin plate is provided so as to be inserted into the measuring hole.

  In the laminated core manufacturing apparatus according to the first aspect, the chamfered portion is formed on at least a part of the outer peripheral edge of the cutting edge portion of the cutting and raising punch. It is possible to suppress the generation of burrs.

  In the second aspect of the present invention, the chamfered portion (72a, 72b) has an arc surface with respect to the first side surface.

  In the laminated core manufacturing apparatus according to the second aspect, the chamfered portion is formed as a circular arc surface, so that the generation of burrs on the inner peripheral surface of the measuring hole can be more effectively suppressed.

  In the third aspect of the present invention, with regard to the first or second aspect, the cutting edge of the cutting and raising punch (P4a) is substantially circular when viewed from the punching direction of the cutting and raising punch. Features.

  In the laminated core manufacturing apparatus according to the third aspect, the cutting edge is formed in a substantially circular shape when viewed from the punching direction, so that the cutting edge is more smoothly inserted into the measuring hole. Generation | occurrence | production of the burr | flash in the internal peripheral surface of a hole can be suppressed more effectively.

  According to a fourth aspect of the present invention, there is provided an outer punching portion (40) provided with an outer punch (P5) for punching an outer shape of the iron core thin plate from the strip-shaped thin steel plate with respect to any one of the first to third aspects. Further, the outer shape punching portion is provided with an abutting protrusion (P6) that protrudes from a blade edge portion (P5a) of the outer shape punch and contacts the cut and raised portion when the outer shape is punched. And

  In the laminated core manufacturing apparatus according to the fourth aspect of the present invention, the generation of burrs in the measuring hole due to the insertion of the cut and raised punch into the measurement hole is suppressed, and the lamination is performed by the contact of the contact protrusion with the cut and raised portion. It is possible to stably perform caulking connection between a plurality of iron core thin plates constituting the iron core.

  According to a fifth aspect of the present invention, in a laminated core manufacturing apparatus, a laminated core is manufactured by punching an iron sheet from a strip-like sheet steel (W) that is intermittently transferred and laminating a plurality of the iron sheet by caulking. In this manufacturing method, by selectively executing a punching operation according to the intermittent transfer, only a lowermost core thin plate corresponding to the lowermost layer of the laminated core is a caulking coupling through hole. A measuring hole forming step for forming a hole and a punching operation according to the intermittent transfer are always performed, so that the caulking connection is performed at a position corresponding to the measuring hole in the iron core thin plate other than the lowermost iron core thin plate. A cut and raised forming step of forming a cut and raised portion that is an unevenness, and in the cut and raised forming step, the cut and raised punch is chamfered formed on at least a part of the outer peripheral edge of the blade edge portion. Have a part Together, characterized in that it is inserted into the measurement hole to the bottom core sheet.

  In the laminated core manufacturing method according to the fifth aspect, the chamfered portion is formed on at least a part of the outer peripheral edge of the cutting edge portion of the cutting and raising punch, and the measurement hole is inserted into the measuring hole by inserting the cutting and raising punch. It is possible to suppress the generation of burrs.

  As described above, according to the present invention, there is an excellent effect that it is possible to suppress the generation of burrs in the measuring hole due to the insertion of the cut and raised punch with a simple configuration.

Schematic configuration diagram of a progressive mold apparatus according to an embodiment of the present invention The figure which shows the strip layout regarding the progressive die apparatus of FIG. Sectional view showing a laminated iron core manufactured with a progressive die device Three views showing the shape of the cutting edge of the measuring punch Three views showing the shape of the cutting edge of the cutting and punching punch Explanatory drawing of insertion operation of cutting and raising punch into measuring hole FIG. 6 is a two-side view showing a first modification of the shape of the cutting edge portion of the cut and raised punch shown in FIG. Three views showing a second modification of the shape of the cutting edge of the raised punch shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a progressive mold apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing a strip layout related to the progressive mold apparatus, and FIG. 3 is a laminated core manufactured by the progressive mold apparatus. FIG. In addition, each process (1)-(5) in the strip layout in FIG. 2 is implemented by each part of the progressive metal mold apparatus which attached | subjected (1)-(5) in FIG.

  As shown in FIG. 1, a progressive die apparatus (laminated core manufacturing apparatus) 1 performs metal press processing on a hoop material (strip-shaped thin steel sheet) W made of an electromagnetic steel sheet, thereby forming an iron core sheet 20 (see FIG. 2). ) Is laminated to produce a laminated core 21 (see FIG. 3). The progressive die apparatus 1 is mainly composed of an upper mold 2 provided so as to be capable of reciprocating up and down, and a lower mold 3 fixed to a holder (not shown).

  The upper die 2 includes a punch holder 10 slidably supported by a guide post (not shown), a plurality of packing plates 11 attached to the lower portion of the punch holder 10, and a plurality of punch plates attached to the lower portion of the packing plate 11. 12, a plurality of punches P1 to P5 held by the punch holder 10 through the packing plate 11 and the punch plate 12, and a stripper guide (not shown) are supported so as to be raised and lowered, and punch the hoop material W after punching. It has a stripper main body 13 separated from P1 to P5, and a plurality of stripper plates 14 attached to the lower part of the stripper main body 13.

  In the lower die 3, a plurality of dies provided corresponding to the punches P1 to P5 are held on the die plate. However, only the dies D4 and D5 corresponding to the punches P4 and P5 are shown in FIG.

  In the progressive die apparatus 1, the hoop material W is intermittently fed between the upper mold 2 and the lower mold 3 by a feeding device (not shown), and the hoop material is reciprocated by the reciprocating motion of the upper mold 2 according to the intermittent transfer. Punch operations of the punches P1 to P5 with respect to W are performed. Finally, the punched core sheets 20 are caulked and joined together in a state where a predetermined number of layers are stacked, thereby forming a laminated core 21 (see FIG. 3) for a rotating electrical machine.

  More specifically, in the manufacturing process of the laminated iron core 21, as shown in FIGS. 1 and 2, the pilot hole (positioning hole) p is punched by the pilot punch P1 (pilot hole punching process (1)), and the measuring punch Punching of measuring hole k1 by P2 (measuring hole punching step (2)), punching of inner shape hole d1 by inner punch P3 (inner shape hole punching step (3)), and cutting by cutting punch P4 For the hoop material W, punching (half-punching) of the raised portion k2 (cut-raised portion forming step (4)) and punching of the outer hole d2 by the outer punch P5 (outer hole punching step (5)) are performed. Furthermore, after punching out the outer hole d2, a step of rotating and laminating the iron core thin plates 20 (rotating and laminating step (6)) is performed.

  In the present specification, for convenience of explanation, it is described that the punching by the punches P1 to P5 is performed on the iron core thin plate, but more strictly, the punching is performed later on the hoop material W by the iron core. This is performed on the part to be punched out as the thin plate 20.

  In the measurement hole forming unit 30 for executing the step (2), only the iron core thin plate corresponding to the lowermost layer of the laminated iron core 21 shown in FIG. 3 (hereinafter referred to as “lowermost iron core thin plate 20B”) is used for caulking and coupling. A measurement hole k1 which is a through hole is formed. Here, the three measuring holes k1 having substantially the same shape are arranged at equal intervals in the circumferential direction, but various changes can be made to the number and arrangement of the measuring holes.

  As shown in FIG. 1, the measuring hole forming unit 30 is provided with a cam mechanism 31 for selectively executing the punching operation of the measuring punch P <b> 2. The cam mechanism 31 includes a cam member 32 and a drive device 33 that slides the cam member 32 in the horizontal direction on the upper surface of the punch plate 12. The bottom surface (cam surface) 32a of the cam member 32 is provided with a recess 34 that can accommodate the upper end portion P2b of the measuring punch P2. In a state where the upper end portion P2b of the measuring punch P2 is accommodated in the concave portion 34 of the cam member 32 (the state shown in FIG. 1), the measuring punch P2 is at the standby position (upward position), and punching by the measuring punch P2 is not executed. On the other hand, when the cam member 32 moves horizontally, the upper end portion P2b of the measuring punch P2 escapes from the concave portion 34 and comes into contact with the bottom surface 32a of the cam member 32, whereby the measuring punch P2 is moved to the operating position (lowering position). ) And the punching by the measuring punch P2 is executed.

  With such a configuration, the measuring punch P2 moves to the operating position when the lowermost core thin plate 20B is in the punching position (position punched by the punch), and other core thin plates other than the lowermost core thin plate 20B are punched. If it is, move to the standby position.

  In the cut-and-raised portion 35 that executes step (4), a cut-and-raised portion (caulking projection) k2 that is an unevenness for caulking is formed with respect to the iron core thin plate 20 other than the lowermost iron core thin plate 20B. . In the cut-and-raised portion 35, the corresponding portion (cut-and-raised portion k2) is punched out in a half-cut shape by the cut-and-raised punch P4, whereby a concave portion is formed on the upper surface side of the iron core thin plate 20. A convex part is formed at a position on the lower surface side of the iron core thin plate 20 corresponding to the part. Here, three cut-and-raised portions k2 having substantially the same shape are provided at substantially the same positions as the above-described three measuring holes k1. When the iron core thin plates 20 are stacked, each convex portion of one iron core thin plate is inserted into each concave portion (each measurement hole k1 in the lowermost layer) of the other iron core thin plate between the upper and lower adjacent iron core thin plates. A state is reached, and both are caulked and joined together. On the other hand, in the cut-and-raised part 35, the cam mechanism as in the measurement hole forming part 30 is not provided, so the punching operation of the cut-and-raised punch P4 is executed for all the iron core thin plates, and the lowermost iron core thin plate. When 20B is in the punching position, the cutting edge P4a of the punch P4 is inserted into the already formed measuring hole k1.

  In the outer shape punching portion 40 that executes the step (5), when the outer shape hole d2 is punched by the outer shape punch P5, the contact protrusion P6 is against the caulking portion (that is, the portion where the cut and raised portion k2 is formed). Abut. A plurality of the contact protrusions P6 are provided in the outer shape punch P5, and the tip portions P6a thereof are respectively arranged corresponding to the positions of all the cut and raised portions k2. The front end portion P6a of each contact projection P6 protrudes slightly downward from the blade edge portion P5a at the lower end of the outer shape punch P5, and presses the cut and raised portion k2 (concave portion) downward when the outer shape hole d2 is punched. To do.

  The pressing force by the contact protrusion P6 acts to stabilize the caulking connection between the iron core thin plate 20 punched out of the outer hole d2 and the iron core thin plate 20 in the die D5 punched out first. It is not necessary to generate a large pressing force, and a pressing force close to zero may be sufficient. Further, the tip end portion P6a of the contact protrusion P6 has a size and a shape that can be inserted into the concave portion of the cut and raised portion k2. However, the structure which is not inserted in the recessed part in the cut-and-raised part k2 is also possible by adjusting the protrusion amount from the blade edge | tip part P5a of the external shape punch P5. Further, the number of the contact protrusions P6 can be changed, and the contact protrusions P6 (tip portions P6a) may be provided corresponding to the position of at least one cut-and-raised portion k2.

  In the rotary laminating unit 45 that executes the step (6), the punched iron core thin plate 20 is stacked on the core thin plate group 47 that is punched earlier and stacked in the rotary die D5. It is sequentially pushed into the squeeze ring 48 below the rotary die D5. The rotary die D5 rotates the core thin plate 20 by a predetermined angle (120 ° in this case) before the newly punched core thin plate 20 is stacked on the core thin plate group 47. Thereby, it can laminate | stack while changing the rotation position of each iron core thin plate 20, eliminates the influence by the small thickness deviation which may arise in the iron core thin plate 20, and manages the stacking thickness of a product (laminated core) with high precision. can do. Further, even when the number of the contact protrusions P6 smaller than the number of the raised portions k2 is provided, there is an advantage that it is possible to avoid pressing only the caulking portion at a predetermined position by the contact protrusions P6. .

  FIG. 4 is a trihedral view showing the shape of the cutting edge of the measuring punch. The blade edge portion P2a of each measuring punch P2 has a substantially rectangular parallelepiped shape, and the lower surface 50 of the blade edge portion P2a has a substantially rectangular shape in the bottom view of FIG. In addition, in the front view of FIG. 4B, the two corners 52a and 52b on the front surface 51 of the blade edge part P2a are formed at substantially right angles. In addition, in the side view of FIG. 4C, the two corners 54a and 54b on the right side surface 53 of the blade edge part P2a are formed substantially at right angles.

  FIG. 5 is a three-sided view showing the shape of the cutting edge of the cutting and raising punch, and FIG. 6 is an explanatory view of the operation of inserting the cutting and raising punch into the measuring hole ((A) before insertion, (B) when inserted). is there. The cutting edge portion P4a of each cutting and raising punch P4 has a substantially rectangular parallelepiped shape substantially the same size as the cutting edge portion P2a of the measuring punch P2, but the measuring punch is chamfered at the outer peripheral edge (corner portion) at the tip. It is different from the shape of P2.

  5A, the lower surface 61 of the cutting edge portion P4a of the cutting and raising punch P4 has a substantially rectangular shape having substantially the same size as the measuring hole k1, but in the front view of FIG. 5B, The corners (chamfered portions) 62a and 62b on both sides of the cutting edge portion P4a of the cut and raised punch P4 each have an R surface shape that is chamfered in an arc shape. Further, in the side view of FIG. 5C, the corners (chamfered portions) 63a and 63b on both sides of the cutting edge portion P4a of the cut and raised punch P4 each have an R surface shape that is chamfered in an arc shape.

  With such a configuration of the cutting edge portion P4a of the cut and raised punch P4, as shown in FIGS. 6A and 6B, when the cut and raised punch P4 is inserted into the measuring hole k1 in the lowermost core thin plate 20B. In addition, even when the outer peripheral edge of the cutting edge portion P4a of the punch P4 and the inner peripheral edge of the measuring hole k1 come into contact with each other due to problems of dimensional accuracy and position accuracy of the punch and hoop material, the cutting punch P4 It is smoothly inserted into the measuring hole k1 by the R surface shape formed on the outer peripheral edge of the tip. With such a configuration, it is possible to suppress the occurrence of burrs and sagging on the inner peripheral surface of the measuring hole k1 due to the cutting and raising punch P4 being inserted.

  Note that the chamfer size and arc curvature of the outer peripheral edge (corner portion) at the tip of the cutting edge portion P4a of each cutting and raising punch P4, the dimensional accuracy of the punch, die, hoop material W, etc. in the progressive die apparatus 1 An appropriate value can be determined from the viewpoint of suppressing occurrence of burrs and sagging in consideration of the position accuracy. In this specification, the term “arc (shape)” indicating a chamfered shape is a concept including not only a part of the circumference but also a part of the parabola.

  FIG. 7 is a two-side view showing a first modification of the shape of the cutting edge of the cutting and raising punch shown in FIG. In the first modification, matters not particularly mentioned below are the same as those in the above-described embodiment (the same applies to the second modification described later). For example, in the progressive die apparatus 1, the shape of the die or the like in the lower die 3 is also changed in accordance with the change in the shape of the cutting edge portion in the cut and raised punch P4 in the first modification.

  In the first modified example, the cutting edge P4a of each cutting and raising punch P4 has a substantially cylindrical shape, and the outer peripheral edge (corner) at the tip thereof is chamfered. 7A, the lower surface 71 of the blade edge part P4a has a substantially circular shape. Further, in the front view of FIG. 7B, the corners (chamfered portions) 72a and 72b on both sides of the cutting edge portion P4a of each cutting and raising punch P4 each have an R surface shape that is chamfered in an arc shape. With such a configuration, the cutting edge P4a of the cut and raised punch P4 is more smoothly inserted into the measuring hole k1 by the R-surface shape formed on the circular outer peripheral edge. Thereby, generation | occurrence | production of the burr | flash and sagging in the internal peripheral surface of the measurement hole k1 by the cutting and raising punch P4 can be suppressed more effectively.

  FIG. 8 is a trihedral view showing a second modification of the shape of the cutting edge portion of the cut and raised punch shown in FIG. In the second modification, the cutting edge portion P4a of each cutting and raising punch P4 has a substantially rectangular parallelepiped shape, but the chamfered shape at the outer peripheral edge (corner portion) at the tip is different from that shown in FIG.

  8A, the lower surface 81 of the cutting edge P4a of each cutting and raising punch P4 has a substantially rectangular shape. Further, in the front view of FIG. 8B, the corner portions (chamfered portions) 82a and 82b on both sides of the cutting edge portion P4a of each cut and raised punch P4 have a C-surface shape that is linearly chamfered. Further, in the side view shown in FIG. 8C, the corners (chamfered portions) 83a and 83b on both sides of the cutting edge portion P4a of each cut-and-raised punch P4 each have an R surface shape that is chamfered in an arc shape. That is, the cutting edge P4a of each cutting and raising punch P4 has a C-surface shape in which the outer peripheral edge (corner portion) at the front end on the relatively wide front side is chamfered linearly, while the relatively narrow width. The outer peripheral edge (corner part) at the tip on the left and right side surfaces has an R-surface shape that is chamfered in an arc shape.

  As mentioned above, although this invention was demonstrated based on specific embodiment, these embodiment is an illustration to the last, Comprising: This invention is not limited by these embodiment. For example, the chamfered portion at the outer peripheral edge (corner portion) at the tip of the cutting edge of the cutting and raising punch is preferably provided on the entire outer peripheral edge, but not limited to this, as long as burr and sag of the measuring hole can be suppressed. In this case, it may be provided at a part of the outer periphery. Further, in one cut and raised punch, a plurality of chamfered shapes (for example, R surface shape, C surface shape) can be applied in any combination. Moreover, various changes can be made in the manner of punching the iron core thin plate (the shape and size of the hole to be punched). It should be noted that the constituent elements of the laminated core manufacturing apparatus and the laminated core manufacturing method according to the present invention shown in the above embodiment are not necessarily all required, and are appropriately selected as long as they do not depart from the scope of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Progressive die apparatus 20 Iron core thin plate 21 Laminated iron core 20B Bottom iron core thin plate 30 Measuring hole formation part 35 Cut-and-raise formation part 40 External punching part 48 Squeeze rings 52a and 52b Corner | angular part (chamfer part)
54a, 54b Corner portion (chamfered portion)
62a, 62b Corner portion (chamfered portion)
63a, 63b Corner portion (chamfered portion)
72a, 72b Corner portion (chamfered portion)
82a, 82b Corner portion (chamfered portion)
83a, 83b Corner portion (chamfered portion)
D4 Die D5 Rotating die k1 Measuring hole k2 Cut-and-raised part p Pilot hole P1 Pilot punch P2 Measuring punch P2a Cutting edge part P3 Internal punch P4 Cutting and raising punch P4a Cutting edge part P5 External punch P5a Cutting edge part P6 Contact protrusion W Hoop material (Strip steel sheet)

Claims (5)

A laminated core manufacturing apparatus for manufacturing a laminated core formed by punching an iron sheet from a strip-shaped sheet steel that is intermittently transferred and laminating a plurality of the iron sheet by caulking,
By selectively executing a punching operation according to the intermittent transfer, a measuring punch that forms a measuring hole which is a through hole for caulking and coupling only to the lowermost core thin plate corresponding to the lowermost layer of the laminated core A provided measuring hole forming section;
By constantly executing the punching operation according to the intermittent transfer, a cut-and-raised portion that is an unevenness for caulking is formed at a position corresponding to the measurement hole in the iron core thin plate other than the lowermost iron core thin plate. A cut and raised forming portion provided with a cut and raised punch,
The cut and raised punch has a chamfered portion formed as an arc surface on at least a part of the outer peripheral edge of the lower surface of the blade edge portion, and is provided so as to be inserted into the measuring hole with respect to the lowermost iron core thin plate. A laminated iron core manufacturing apparatus characterized by being made. The cutting edge of the cut and raised punch laminated core manufacturing apparatus according to claim 1, characterized in that an approximately circular shape when viewed from the punching direction of the cut-and-raised punch. An outer punching portion provided with an outer punch for punching the outer shape of the iron core thin plate from the strip-shaped thin steel plate;
Wherein the outer shape punching unit, said protruding from the cutting edge portion of the outer punch, according to claim 1 or claim 2, wherein the abutting abutment projections on the cut-and-raised portion during punching of the outer shape is provided The laminated core manufacturing apparatus described in 1. A laminated core manufacturing apparatus for manufacturing a laminated core formed by punching an iron sheet from a strip-shaped sheet steel that is intermittently transferred and laminating a plurality of the iron sheet by caulking,
By selectively executing a punching operation according to the intermittent transfer, a measuring punch that forms a measuring hole which is a through hole for caulking and coupling only to the lowermost core thin plate corresponding to the lowermost layer of the laminated core A provided measuring hole forming section;
By constantly executing the punching operation according to the intermittent transfer, a cut-and-raised portion that is an unevenness for caulking is formed at a position corresponding to the measurement hole in the iron core thin plate other than the lowermost iron core thin plate. A cut and raised forming section provided with a cut and raised punch;
With
The cut-and-raised punch has a rectangular parallelepiped or columnar cutting edge inserted into the measuring hole, and at least a part of a corner of the tip of the cutting edge is chamfered. manufacturing device. In the laminated core manufacturing apparatus, a method of manufacturing a laminated core that produces a laminated core formed by punching an iron sheet from a strip-like sheet that is intermittently transferred and laminating the iron sheet by caulking,
Metering hole formation that forms a measuring hole that is a through hole for caulking and coupling only to the lowest core sheet corresponding to the lowest layer of the laminated core by selectively executing a punching operation according to the intermittent transfer Process,
By constantly executing the punching operation according to the intermittent transfer, a cut-and-raised portion that is an unevenness for caulking is formed at a position corresponding to the measurement hole in the iron core thin plate other than the lowermost iron core thin plate. Cutting and forming process,
In the cut and raised forming step, the cut and raised punch has a chamfered portion formed as an arc surface on at least a part of the outer peripheral edge of the lower surface of the blade edge portion, and the weighing with respect to the lowermost core thin plate. A method for manufacturing a laminated iron core, wherein the method is inserted into a hole.

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