JP5719979B1 - Laminated iron core manufacturing apparatus and laminated iron core manufacturing method - Google Patents

Abstract

[PROBLEMS] To manufacture a laminated iron core by punching a thin steel sheet having segments arranged in a row from a strip-shaped thin steel sheet, and to prevent the remaining material from entering the die hole in the strip-shaped thin steel sheet while improving the material yield. . A progressive die apparatus 1 is disposed on a downstream side of a first outer shape punching portion 37 in a transfer direction of a strip-shaped thin steel plate, a first outer shape punching portion 37 for punching an outer shape of an iron core thin plate 10 from a hoop material W, A second outer shape punching portion 38 for punching the outer shape of the iron core thin plate from the hoop material in an arrangement different from that of the first outer shape punching portion is provided. Punched in a state extending in a direction substantially opposite to the transfer direction of W, and in the second outer shape punching portion, each tooth portion extends in a substantially transfer direction of the yoke portion or the hoop material, and the first outer shape It is set as the structure punched so that it may arrange | position between the punching holes of the teeth part punched in the punching part. [Selection] Figure 4

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 apparatus, a plurality of annular core sheets are continuously formed by sequentially punching pilot holes, slots, inner diameter teeth, outer shapes, etc., on the hoop material that is intermittently transferred in the mold, A predetermined number of these annular core thin plates are laminated (integrated) in a die or squeeze ring. After that, in the case of a stator core for a rotating electrical machine, winding is applied to the teeth protruding radially on the inner peripheral side, but a stator core made of an annular laminated core secures a space for inserting a winding jig. There are inconveniences such as difficult to do.

  Therefore, for example, core pieces including one or a plurality of segments (consisting of a tooth portion and a corresponding yoke portion) are arranged in a row, and adjacent core pieces are connected by a narrow connecting portion. Thus, there is known a method of manufacturing a strip-shaped connection type laminated iron core (see Patent Document 1). If such a connection type laminated iron core is adopted, after winding the teeth in a state where the core pieces are arranged in a row, the row of core pieces is formed in an annular shape while deforming each connection portion, An annular laminated iron core can be obtained by fixing both ends of the core piece by welding or the like.

JP 2003-235187 A

  By the way, in the conventional method for manufacturing a laminated core as described in Patent Document 1, for example, as shown in the strip layout of FIG. 6, punching is performed in order to improve the yield of the material when punching the core sheet. The first and second outer shape punching portions (see the first outer shape punching hole Ha0 and the second outer shape punching hole Hb0 in FIG. 6) in which the directions of the iron core thin plates are different from each other are set in the transfer direction of the hoop material W (arrow F in FIG. 6). A configuration is known in which a predetermined interval is provided in the reference).

  That is, in FIG. 6, the second outer shape punching hole Hb0 of the iron core thin plate punched at the second outer shape punching portion and the upstream side of the second outer shape punching hole Hb0 at the time of punching the second outer shape punching portion (reverse transfer direction of the hoop material W). ), The tips of the tooth portions 17a and 17b alternately approach the counterpart yoke portions 18a and 18b (that is, one of the iron core thin plates (i.e. 2, each tooth portion in the outer shape punching hole Hb <b> 0) is disposed so as to be inserted between the teeth portions in the other iron core thin plate (that is, the first outer shape punching hole Ha <b> 1). Such an arrangement at the time of punching the iron core thin plate has an advantage that the distance between the first and second outer shape punched portions can be made more compact. The prior art shown in FIG. 6 (same as in FIG. 7) is different from the present invention to be described later, but in order to facilitate comparison with the present invention, the shape of the iron core thin plate (the outer shape of the iron core thin plate). Are made the same shape as the iron core thin plate according to the present invention, and the corresponding components are given the same reference numerals as in FIG.

  On the other hand, in the conventional method for manufacturing a laminated core as described above, as shown in FIG. 7A, the remaining material after the outer shape punching is formed between the first outer shape punching hole Ha1 and the second outer shape punching hole Hb0. The skeleton portion 45 is deformed by the influence of shear stress due to punching. When the deformation of the skeleton portion 45 occurs, as shown in FIG. 7B, a part (here, a concave piece arranged so as to surround the teeth portion 17a punched by the first outer shape punching portion) The portion 45a) enters the opening (die hole) D8a of the die D8 of the lower die 3 in the second outer shape punching portion, thereby hindering the feeding operation of the hoop material W. Such a problem becomes an adverse effect of an increase in the processing speed (pressing speed) in the progressive die apparatus, and also causes a component breakage due to a failure of the punching process.

  The present invention has been devised in view of the problems of the prior art, and the iron core thin plate in which one base portion and a segment including at least one extension portion extending from the base portion are arranged in a row, When manufacturing a laminated core by punching the steel sheet from the strip-shaped steel sheet, it is possible to improve the yield of the material while preventing the remaining material from entering the die hole in the strip-shaped steel sheet. The main object is to provide an apparatus and a method for manufacturing a laminated core.

According to a first aspect of the present invention, there is provided a laminated core manufacturing apparatus for producing a laminated core (11) formed by punching an iron sheet (10) from a strip-like sheet steel (W) that is intermittently transferred and laminating a plurality of the iron sheets. The iron core thin plate has a plurality of segments (13) punched in a state of being arranged in a line along a first direction intersecting with a longitudinal direction of the strip-shaped thin steel plate, and the segment has one base portion. (18) and at least one extension part (17) extending from the base part, a first outer shape punching part (37) for punching the outer shape of the core thin sheet from the strip-shaped steel sheet, and transfer of the strip-shaped steel sheet A second outer shape punching portion (38) which is disposed downstream of the first outer shape punching portion in the direction and punches the outer shape of the iron core thin plate from the strip-shaped thin steel plate in an arrangement different from the first outer shape punching portion. For example,
In the first outer shape punching portion, the extending portions are punched in a state of extending from the base portion to the upstream side in the transport direction of the strip steel sheet along a second direction different from the first direction. In the second outer shape punched portion, each of the extended portions is extended from the base portion in a substantially transferring direction of the strip-shaped thin steel plate, and the extended portion punched in the first outer shape punched portion. It is characterized by being punched so as to be disposed between the punching holes.

  In the laminated core manufacturing apparatus according to the first aspect, in the second outer shape punched portion on the downstream side of the first outer shape punched portion, each extending portion extends from the base portion in the substantially transport direction of the strip-shaped thin steel plate, In addition, since it is punched so as to be arranged between the punched holes of the extended portion punched in the first outer shape punched portion, the laminated core is manufactured by punching the core thin plate in which the segments are arranged in a row from the strip-shaped thin steel plate. In this case, it is possible to prevent the remaining material from entering the die hole in the strip-shaped thin steel sheet while improving the material yield.

  The second aspect of the present invention relates to the first aspect, wherein the second outer shape punched portion has a punch (P8) and a die (D8) that form a pair for punching the outer shape of the iron core thin plate, The remaining material (45) of the strip-shaped thin steel sheet after the iron sheet has been punched in the second punched part has an intrusion prevention part (45a) positioned around the extension in the punched sheet metal sheet. The downstream end of the intrusion prevention part is located on the downstream side beyond the opening (D8a) of the die in the transport direction of the strip-shaped steel sheet.

  In the laminated core manufacturing apparatus according to the second aspect, an intrusion prevention portion is formed around the extension portion, and the downstream end portion of the intrusion prevention portion is located downstream beyond the opening of the die. Therefore, when manufacturing a laminated core by punching out the core sheet with the segments arranged in a row from the strip-shaped sheet steel, the material yield is improved and the remaining material in the strip-shaped sheet is prevented from entering the die hole. It becomes possible.

  According to a third aspect of the present invention, with respect to the first or second aspect, the laminated iron core constitutes a stator core (11) of a rotating electrical machine, and the base portion constitutes a yoke portion (an outer peripheral portion of the stator core). 18), and the extending portion is a teeth portion (17) extending from the yoke portion toward the inner peripheral side.

  In the laminated core manufacturing apparatus according to the third aspect, a core thin plate in which segments (consisting of one yoke portion and at least one tooth portion extending from the yoke portion) are arranged in a row is punched from the strip-shaped steel plate. Thus, when a stator core of a rotating electrical machine is manufactured, it is possible to prevent the remaining material from entering the die hole in the strip-shaped thin steel sheet while improving the material yield.

  According to a fourth aspect of the present invention, there is provided a method for producing a laminated core (11) formed by punching an iron sheet from a strip-shaped sheet (W) that is intermittently transferred, and laminating a plurality of the sheet iron (10). The iron core thin plate has a plurality of segments (13) punched out in a state of being arranged in a line along a first direction intersecting with the longitudinal direction of the strip-shaped thin steel plate, and the segment includes one base (18). And a first outer shape punching step (step (7)) that includes at least one extending portion (17) extending from the base portion and punches the outer shape of the iron core thin plate from the strip-shaped thin steel plate, and the first outer shape punching step. And a second outer shape punching step (step (8)) for punching the outer shape of the iron core thin plate from the strip-shaped thin steel plate in an arrangement different from that of the first outer shape punching step. Process Each of the extending portions is punched in a state extending along the second direction different from the first direction from the base portion to the upstream side in the transfer direction of the strip steel sheet, and the second outer shape punching is performed. In the step, each of the extending portions extends from the base portion to the downstream side in the substantially transfer direction of the strip-shaped thin steel plate, and the punched hole of the extending portion is punched in the first outer shape punching step. It is characterized by being punched so as to be placed between them.

  As described above, according to the present invention, a laminated iron core is obtained by punching the iron core thin plate from the strip-shaped thin steel plate with respect to the iron core thin plate in which one base and a segment including at least one extending portion extending from the base are arranged in a row. In the manufacturing process, it is possible to prevent the remaining material from entering the die hole in the strip-shaped thin steel sheet while improving the yield of the material.

Schematic configuration diagram of a progressive mold apparatus according to an embodiment of the present invention FIG. 1 is a plan view of a thin iron sheet punched out by the progressive die apparatus shown in FIG. FIG. 1 is a plan view of a laminated core manufactured by the progressive die apparatus of FIG. The figure which shows the outline of the strip layout regarding the progressive die apparatus of FIG. Explanatory drawing which shows the external punching method of the laminated iron core by the progressive die apparatus of FIG. The figure which shows the outline of the strip layout regarding the conventional progressive die apparatus Explanatory drawing which shows the external punching method of the laminated iron core by the conventional progressive metal mold apparatus

  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 plan view of an iron core sheet punched by the progressive mold apparatus, and FIG. 3 is manufactured by the progressive mold apparatus. 4 is a plan view of the laminated core, and FIG. 4 is a diagram showing an outline of the strip layout relating to the progressive die apparatus. In addition, each process (1)-(8) in the strip layout in FIG. 4 is implemented by each part which attached | subjected the code | symbol (1)-(8) in the progressive die apparatus in FIG.

  As shown in FIG. 1, a progressive die apparatus (laminated core manufacturing apparatus) 1 performs a metal pressing process on a hoop material (strip-shaped thin steel sheet) W made of an electromagnetic steel sheet, thereby forming an iron core sheet 10 (see FIG. 2). Is manufactured, and a laminated iron core 11 (see FIG. 3) formed by laminating a plurality of the iron core thin plates 10 is manufactured. 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 is supported by a guide post 4 extending from the lower die 3 so as to be movable up and down, and can be raised and lowered together with a plurality of punches P1 to P8 for punching the iron core thin plate 10 and the upper die 2. And a stripper plate 5 that is supported by the stripper guide and separates the punched hoop material W from the punches P1 to P8. The lower die 3 holds a plurality of dies provided corresponding to the punches P1 to P8, respectively, but only the dies D7 and D8 corresponding to the punches P7 and P8 are shown in FIG. In the present specification, for convenience of explanation, it is described that the punching by the punches P1 to P8 is performed on the iron core thin plate 10, but more strictly, the punching is performed later on the hoop material W. This is performed on the part punched as the iron core thin plate 10.

  In the progressive die apparatus 1, the hoop material W is intermittently fed in the transfer direction F between the upper mold 2 and the lower mold 3 by a feeder (not shown). The punching operation of the punches P1 to P8 with respect to the hoop material W is performed by the reciprocating motion. Finally, the punched iron core thin plates 10 are caulked and joined together in a state where a predetermined number of layers are laminated, thereby forming a laminated core 11 for a rotating electrical machine (here, a stator core for a motor).

  As shown in FIG. 2, the iron core thin plate 10 is composed of 12 (only 5 are shown in FIG. 2) segments 13 each having a substantially T shape and a connecting piece 14 that connects adjacent segments 13 to each other. It is configured. The segment 13 includes a teeth portion (extension portion) 17 that constitutes a magnetic pole portion to which a winding is applied after lamination, and a substantially arc-shaped yoke portion (base portion) 18 that constitutes a yoke portion after lamination. Yes. The connecting piece 14 is formed as an easily deformable narrow width portion that connects the yoke portions 18 by punching out (cutting out) a part of the region between the adjacent segments 13 (yoke portions 18). .

  The laminated iron core 11 is provided with a winding (not shown) on the tooth portion 17 in a state where the core pieces 20 (consisting of the laminated segments 13) are arranged in a row in a state where a predetermined number of the iron core thin plates 10 are laminated (or After the winding assembly is attached), as shown in FIG. 3, by deforming each connecting portion 21 (consisting of stacked connecting pieces 14), a row of core pieces 20 is formed into an annular shape, and the row of cores is formed. An annular laminated iron core is formed by fixing both ends of the piece 20 by welding or the like. In addition, in this embodiment, although the core piece 20 consists of a laminated body of the one segment 13, it is good also as a structure which consists of a laminated body of the several segment 13. FIG. In that case, the connecting portion 21 is provided for each core piece 20 (that is, the connecting piece 14 is provided for each of a plurality of predetermined segments constituting the core piece 20).

  As shown in FIG. 1 and FIG. 4, in the manufacturing process by the progressive die apparatus 1, punching processing (pilot hole) of the pilot hole (positioning hole) p by the first punch P <b> 1 of the punch hole punching portion 31 is performed on the hoop material W. Punching step (1)) and punching (first opening) h1 between first segments 13 (see FIG. 2) between the segments 13 (see FIG. 2) by the second punch P2 of the first gap punching portion 32 (first opening). A gap portion punching step (2)) and a second gap portion (a substantially triangular shape communicating with the first gap portion) between the segments 13 (see FIG. 2) by the third punch P3 of the second gap portion punching portion 33 are formed. An opening) h2 punching process (second gap punching process (3)), punching of the measuring hole k1 by the fourth punch P4 of the measuring hole punching part 34 (measuring hole punching process (4)), and end part 5th punch P5 of the punching part 35 The punching process of the end forming hole h3 (end forming step (5)) demarcating the outer shape of the both ends of the iron core thin plate 10 and the cut and raised part k2 of the cut and raised part 36 by the sixth punch P6. Punching (half punching) processing (cut-raised portion forming step (6)) and punching processing of the first outer shape punching hole Ha0 by the seventh punch P7 of the first outer shape punching portion 37 (first outer shape punching step (7)) Then, the punching process of the second outer shape punching hole Hb0 by the eighth punch P8 of the second outer shape punching portion 38 (second outer shape punching step (8)) is sequentially performed.

  In addition, after the first outer shape punching step (7) and the second outer shape punching step (8), the iron core thin plate 10 punched in the first laminated portion 39 and the second laminated portion 40, respectively, is die D7, D8 and squeeze. Steps of stacking in the rings S7 and S8 (lamination steps (9) and (10)) are performed.

  In the measuring hole punching step (4), a measuring hole k1 which is a through hole for caulking and coupling is formed only on an iron core thin plate corresponding to the lowermost layer of the laminated iron core 11 (hereinafter referred to as “lowermost iron core thin plate”). The Here, the two measuring holes k1 having substantially the same shape are arranged at a predetermined interval in the longitudinal direction of the tooth portion 17, but various changes can be made to the number and arrangement of the measuring holes. Although not shown in detail, the fourth punch P4 moves to the operating (lowering) position only when the lowermost iron core thin plate is in the punching position (position punched by the punch P4), and other iron cores other than the lowermost iron core thin plate. When the thin plate is in the punching position, it is in the standby (upward) position.

  In the cut-and-raised portion forming step (6), cut-and-raised portions (caulking protrusions) k2 that are ruggedness for caulking and coupling are formed on the iron core thin plate 10 other than the lowermost iron core thin plate. In the progressive die apparatus 1, the corresponding portion (cut-and-raised portion k2) is punched out by the sixth punch P6 in a semi-punched shape, whereby a concave portion is formed on the upper surface side of the iron core thin plate 10, while the concave portion A convex portion is formed at a position on the lower surface side of the corresponding iron core thin plate 10. Here, two cut-and-raised portions k2 having substantially the same shape are provided at substantially the same positions as the above-described two measuring holes k1.

  As will be described in detail later, in the first outer shape punching step (7) and the second outer shape punching step (8), the arrangement of the iron core thin plates to be punched (the left and right directions in FIG. 4) are different from each other. The pilot hole punching step (1) to the cut-and-raised portion forming step (6) are the iron core thin plate 10 (hereinafter referred to as “first iron core thin plate” as necessary) punched by the first outer shape punching step (7). It is a process for. Although not shown in FIGS. 1 and 4, the second outer shape punching step (8) is performed between the first outer shape punching step (7) and the second outer shape punching step (8) by the eighth punch P8. ), The same steps as the pilot hole punching step (1) to the cut-and-raised portion forming step (6) are performed for the iron core thin plate 10 (hereinafter referred to as “second iron core thin plate” if necessary). To be implemented. Therefore, also in the progressive die apparatus 1, in order to form a 2nd iron core thin plate, the punch which has the structure similar to the above-mentioned P1-P6, the die | dye corresponding to them, etc. are provided.

  In the first outer shape punching step (7), the yoke portion 18 (see FIG. 2) in each segment 13 of the first core thin plate 10 is perpendicular (or substantially perpendicular) to the transfer direction (that is, the longitudinal direction) of the hoop material W. Further, the teeth portion 17 (see FIG. 3) is punched in a state where the teeth portion 17 (see FIG. 3) extends from the central portion of the yoke portion 18 in a direction opposite to (or substantially opposite to) the transfer direction of the hoop material W. . In the second outer shape punching step (8), the yoke portion 18 in each segment 13 of the second iron core thin plate 10 is punched in a direction perpendicular (or substantially perpendicular) to the transfer direction of the hoop material W, and the teeth The portion 17 is punched out in a state where it extends from the central portion of the yoke portion 18 in the transfer direction (or substantially the transfer direction) of the hoop material W.

  In the first outer shape punching step (7) and the second outer shape punching step (8), the segment 13 is at least along the first direction (see line A0 in FIG. 5) intersecting the longitudinal direction of the hoop material W. Punched in a single row. Further, the tooth portion 17 to be punched out in the transfer direction of the hoop material W from the yoke portion 18 along a second direction (refer to the line B0 in FIG. 5) different from the first direction (here, orthogonal). Punched in a state of extending downstream or upstream.

  However, the shapes and arrangements of the teeth 17 and the yokes 18 to be punched are not strictly limited to the above-described shapes and arrangements, and at least each of the teeth 17 to be punched in the second outer punching part 38 is the first. As long as it can be punched so as to be disposed between the punching holes of the yoke portion 18 punched in the one outer shape punching portion 37, it can be appropriately changed. For example, the arrangement direction of the punched segments 13 does not have to be orthogonal to the longitudinal direction of the hoop material W, and may be a third direction that obliquely intersects (see line A1 in FIG. 5). In this case, the extending direction of the tooth portion to be punched is also arranged along a fourth direction (see line B1 in FIG. 5) different from the third direction.

  In the laminating steps (9) and (10), the punched core sheet 10 is punched earlier and stacked on the core sheet group stacked in the dies D7 and D8. It is sequentially pushed into the squeeze rings S7 and S8 below D7 and D8. At this time, each of the convex portions of one core thin plate is inserted into each concave portion (each measurement hole k1 in the lowermost layer) of the other core thin plate between the upper and lower adjacent core thin plates 10, and they are caulked together. Combined.

  FIG. 5 is an explanatory view showing a method of punching the outer shape of the laminated core by the progressive die apparatus. As shown in FIG. 5A, the second outer shape punching hole Hb0 of the second core thin plate 10 punched by the eighth punch P8 and the downstream side of the second outer shape punching hole Hb0 when the eighth punch P8 is punched (the hoop). In the first outer shape punching hole Ha1 adjacent to the material W in the transfer direction, the tips of the tooth portions 17a and 17b alternately approach the counterpart yoke portions 18a and 18b (that is, one iron core thin plate). Each tooth portion (tooth punch hole) in the (outline punch hole) is inserted between each tooth portion in the other iron core thin plate (tooth punch hole).

  As shown in FIG. 5 (B), the skeleton portion 45, which is the remaining material after the outer shape punching in the second outer shape punching portion 38, is punched by the first outer shape punching portion 37 by the arrangement of the outer shape punching of the iron core thin plate. The concave piece 45a located around the extracted teeth portion 17a (here surrounding three sides) is located downstream of the opening Die 8D8a of the lower die 3 in the second outer shape punching portion D8a. To position. Thereby, even when the skeleton 45 is deformed due to the influence of the shearing stress due to the external punching in the second external punching portion 38, the intrusion into the opening (die hole) D8a of the die D8 such as the concave piece 45a is prevented. Is done. It should be noted that the intrusion prevention portion (in this case, the concave piece portion 45a) that prevents the die D8 from entering the opening D8a is not limited to the shape shown here, and at least the downstream end of the intrusion prevention portion is the die The number, shape, arrangement, and the like can be changed as long as the configuration is positioned on the downstream side beyond the opening D8a of D8.

  Thus, in the manufacturing method of the progressive die apparatus 1 and the laminated iron core 11 described above, the first outer shape punching portion 37 (first outer shape punching step) for punching the outer shape of the iron core thin plate 10 (first iron core thin plate) from the hoop material W. (7)) and the core thin plate 10 (second iron core thin plate) from the hoop material W in an arrangement different from the first outer punching portion 37, which is arranged downstream of the first outer punching portion 37 in the transfer direction of the hoop material W. ) In the first outer shape punching portion 37, each tooth portion 17a has a transfer direction of the hoop material W from the yoke portion 18a, and a second outer shape punching portion 38 (second outer shape punching step (8)). Is punched in a state extending substantially in the reverse direction, and in the second outer shape punching portion 38, each tooth portion 17b extends from the yoke portion 18b in the substantially moving direction of the hoop material W, and the first outer shape punching is performed. In part 37 Punched so as to be disposed between the punching holes of each tooth portion 17a punched.

  Thereby, when manufacturing the laminated iron core 11 by punching out the iron core thin plate 10 which arranged the segment 13 which comprises the core piece 20 in a line from the hoop material W, the remaining material in the hoop material W is improved, improving the yield of material. It becomes possible to prevent the (skeleton part 45) from entering the die D8 hole. As a result, the processing speed (pressing speed) in the progressive die apparatus 1 can be increased, and the remaining material enters the opening D8a in the second outer punching portion 38 (that is, the feeding operation of the hoop material W is performed). It is possible to prevent a punching failure or a punch (blade edge part) from being damaged.

  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 laminated iron core manufactured by the manufacturing apparatus or the manufacturing method according to the present invention is not limited to the stator core, but is a state in which segments including one base portion and at least one extending portion extending from the base portion are arranged in a row. It is sufficient if it is a laminated iron core made of a thin iron core that is punched out at the same time. Depending on the case, a configuration in which the segments are not connected by the connecting pieces (individually punched) is also possible. Moreover, about the shape of each part (tooth part, yoke part, etc.) which comprises the segment in an iron core thin plate, not only what is shown to embodiment but various changes are possible. Further, in the progressive die apparatus, as long as at least the first outer shape punching portion (first outer shape punching step) and the second outer shape punching portion (second outer shape punching step) are sequentially performed, the other punching steps are punched. The order can be changed, omitted or added. 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.

1 Progressive die equipment (laminated core manufacturing equipment)
2 Upper mold 3 Lower mold 10 Iron core thin plate 11 Laminated iron core 13 Segment 14 Connection piece 17 Teeth part (extension part)
18 Yoke part (base part)
20 core piece 21 connecting portion 37 first outer shape punching portion 38 second outer shape punching portion 45 skeleton portion 45a concave piece portion (intrusion prevention portion)
D7 Die D8 Dies Ha0, Ha1 First outer shape punching hole Hb0 Second outer shape punching hole P7 Seventh punch P8 Eighth punch W Hoop material (strip-shaped thin steel plate)

Claims (3)

A laminated core manufacturing apparatus for producing 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 core sheets,
The iron core thin plate has a plurality of segments that are punched in a state of being arranged in a row along a first direction that intersects the longitudinal direction of the strip-shaped thin steel plate, and the segments extend from one base and the base. Including at least one extension
A first outer punching portion for punching an outer shape of the iron core thin plate from the strip-shaped thin steel plate;
A second outer shape punching portion that is disposed downstream of the first outer shape punching portion in the transport direction of the strip-shaped thin steel plate and punches the outer shape of the iron core thin plate from the strip-shaped thin steel plate in an arrangement different from the first outer shape punching portion. And
In the first outer shape punching portion, the extending portions are punched in a state of extending from the base portion to the upstream side in the transport direction of the strip steel sheet along a second direction different from the first direction. ,
The second outer shape punching portion has a punch and a die that form a pair for punching the outer shape of the iron core thin plate,
In the second outer shape punched portion, the extended portions are each punched out in the first outer shape punched portion in a state in which each extended portion extends from the base portion to the downstream side in the substantially transfer direction of the strip-shaped thin steel plate. The remaining material of the strip-shaped thin steel sheet after being punched so as to be disposed between the punched holes of the portion and punched out of the iron core thin plate is positioned around the extending portion of the punched iron core thin plate. An intrusion prevention part is formed,
In the transport direction of the strip steel sheets, the downstream end of the entrance preventing portion is laminated core manufacturing apparatus characterized that you located downstream beyond the opening of the die. The laminated iron core constitutes a stator core of a rotating electrical machine,
2. The laminate according to claim 1 , wherein the base portion is a yoke portion that constitutes an outer peripheral portion of the stator core, and the extension portion is a teeth portion that extends from the yoke portion toward the inner peripheral side. Iron core manufacturing equipment. A method of manufacturing a laminated iron core obtained by punching an iron core thin plate from a strip-like thin steel plate that is intermittently transferred and laminating a plurality of the iron core thin plates,
The iron core thin plate has a plurality of segments that are punched in a state of being arranged in a row along a first direction that intersects the longitudinal direction of the strip-shaped thin steel plate, and the segments extend from one base and the base. Including at least one extension
A first outer shape punching step of punching an outer shape of the iron core thin plate from the strip-shaped thin steel plate;
A second outer shape punching step that is performed after the first outer shape punching step and punches the outer shape of the iron core thin plate from the strip-shaped thin steel plate in an arrangement different from the first outer shape punching step;
In the first outer shape punching step, each of the extending portions is punched in a state extending along the second direction different from the first direction from the base portion to the upstream side in the transport direction of the strip steel sheet. ,
In the second outer shape punching step, each extension portion extends from the base portion to the downstream side in the substantially transfer direction of the strip-shaped thin steel sheet, and the extension punched in the first outer shape punching step. The remaining material of the strip-shaped thin steel sheet after being punched so as to be disposed between the punched holes of the portion and punched out of the iron core thin plate is positioned around the extending portion of the punched iron core thin plate. An intrusion prevention part is formed,
In the transport direction of the strip steel sheets, the downstream end of the entrance preventing portion, the manufacturing method of the laminated core, characterized that you located downstream beyond the opening of the die.

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