JP2005318764A - Method of manufacturing laminated core and mold apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core which can improve the productivity of the laminated core obtained by connecting divided laminated cores having divided yokes and teeth to each other and which can reduce a manufacturing cost, and to provide a mold apparatus. <P>SOLUTION: The method of manufacturing the laminated core includes a cutting and bending step for coupling divided core pieces to one another through an intermediate region after a rotor core piece is punched and formed of a thin plate material, shearing and separating the coupling part of the adjacent divided core pieces through the intermediate region, and bending the intermediate region; a push-backing step of forming the intermediate region bent in the thin plate material in plane with the thin plate material by pushing back; a slot punching step of forming the teeth by punching a predetermined number of the slots in the thin plate material; an inner diameter punching step of punching and forming tips of a predetermined number of the teeth; and a caulking and laminating step of separating and forming the individual divided core pieces by punching the intermediate region together with outer shapes of the divided core pieces and laminating and coupling the divided core pieces on the divided core pieces of the previously punched and formed lower layer and coupling the laminate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention comprises a predetermined number of divided laminated iron cores each having a divided yoke portion and a tooth portion, and includes an annular yoke portion and a predetermined number of teeth portions protruding inward of the yoke portion. The present invention relates to a method for manufacturing a laminated core and a mold apparatus for manufacturing the stator core.

    FIG. 12 shows a conventional laminated iron core (stator iron core) A constituting a stator of an electric motor. The laminated iron core A is manufactured by laminating a predetermined number of iron core pieces Aa and caulking and joining them. And a plurality of teeth portions At, At... Projecting inwardly from the yoke portion Ay.

  In such a circumferentially integrated laminated core A, as shown in FIG. 13, the core piece Aa constituting the laminated core (stator) A is the same as the core piece Ra constituting the rotor core (not shown). It is usual that the material is taken on the strip steel plate W and manufactured together with the rotor core in the same progressive die apparatus (not shown).

  On the other hand, in the above-described laminated iron core A, since the yoke portion Ay has an annular shape and the interval between the adjacent tooth portions At is narrow, winding work on each tooth portion At becomes difficult. In order to solve such problems, a laminated core (stator core) B as shown in FIG. 14 is provided.

  This laminated iron core B has a divided yoke portion Cy and a teeth portion Ct, and manufactures a predetermined number of divided laminated iron cores C provided with fitting convex portions Ch and fitting concave portions Ci at both ends of the divided yoke portion Cy. The plurality of divided laminated cores C are connected to each other and assembled to constitute a laminated core B having a ring-shaped yoke portion By and a plurality of teeth portions Bt (Ct).

  According to such a laminated iron core B, after winding the teeth Ct in each divided laminated iron core C, each divided laminated iron core C, C... The winding work on the tooth portion Ct is extremely easy.

  Here, the above-mentioned prior art known to the applicant is a publicly known / public technique and does not relate to a known literature invention, and therefore there is no prior art document information to be described.

    By the way, when manufacturing the laminated core B having the above-described structure, that is, the circumferentially divided laminated core B formed by connecting a plurality of divided laminated cores C, as shown in FIG. It is also possible to take the material together with the core pieces Ra constituting the rotor core (not shown) in a form in which a predetermined number of core pieces Ca are connected to each other.

  However, as shown in FIG. 15 (b), when the fitting protrusion Ch and the fitting recess Ci of the adjacent iron core piece Ca are formed by punching the slit S with a thin punch (not shown), Since there is a gap between the convex portion Ch and the fitting concave portion Ci, the mutual fitting allowance cannot be set freely, and when the divided laminated cores C are connected to each other, play occurs and the entire There is an inconvenience that the proportion is distorted.

  For this reason, the circumferentially-divided laminated core B as described above takes the material by arranging the core pieces Ca on the strip steel plate WS as shown in FIG. 16 (a), and uses a dedicated progressive die device (not shown). There is a problem that the yield of the material related to the production of the laminated core B is poor, and the production cost is lowered as well as the productivity is lowered.

  Furthermore, since the core pieces Ca are arranged on the strip steel plate WS as described above and the material is taken as described above, the core piece Ra constituting the rotor core (not shown) is a separate strip steel plate as shown in FIG. Since the material is taken up on the WR and the rotor core must be manufactured using a separate progressive die device (not shown), the manufacture of the stator core and the rotor core constituting the motor There was a disadvantage that the cost increased significantly.

  SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method for manufacturing a laminated core and a mold apparatus that can improve the productivity associated with the production of the laminated core and can also achieve a reduction in production cost. .

    In order to achieve the above object, a method for manufacturing a laminated core according to the present invention comprises a predetermined number of divided core pieces being caulked and laminated, having a divided yoke portion and a teeth portion, and connecting portions at both ends of the divided yoke portion. A stator core comprising a ring-shaped yoke portion and a predetermined number of teeth portions projecting inwardly of the yoke portion. A method of manufacturing a laminated core for manufacturing, wherein a rotor core piece is formed by punching from a thin plate material, and then the intermediate core region is formed in a yoke portion forming region in which the divided core pieces are connected to each other with the intermediate region interposed therebetween. A cutting and bending process that shears and separates the connecting portions of adjacent core pieces that are sandwiched and bends the intermediate region, and pushes back the intermediate region that is bent in the thin plate material to form the same level as the thin plate material. A push-back process, a slot punching process for forming a predetermined number of teeth by punching and forming a predetermined number of slots in a thin plate material, an inner diameter punching process for punching and forming tooth tips in a predetermined number of teeth, and a split iron core A step of punching the intermediate region together with the outer shape of the piece to separate and form the individual divided core pieces, and laminating the divided core pieces on the lower divided core pieces formed by punching first, It is out.

  In order to achieve the above object, a mold apparatus according to the present invention is formed by caulking and laminating a predetermined number of divided core pieces, having a divided yoke portion and a teeth portion, and connecting portions at both ends of the divided yoke portion. A stator core comprising a ring-shaped yoke portion and a predetermined number of teeth portions projecting inwardly of the yoke portion. A mold apparatus for manufacturing, in which a rotor core piece is formed by punching from a thin plate material, and then divided iron core pieces are connected to each other with an intermediate area sandwiched between intermediate areas. A cutting and bending station for carrying out a cutting process for shearing and separating the connecting portions of adjacent divided core pieces and bending the intermediate region, and pushing back the intermediate region bent in the thin plate material to make the thin plate material A push-back station that performs a push-back process of forming a flat surface, a slot-extracting station that performs a slot-extracting process that forms a predetermined number of teeth by punching and forming a predetermined number of slots in a thin plate material, and a predetermined number An inner diameter punching station for performing an inner diameter punching process for punching and forming the tooth tip of the teeth portion of the teeth, and punching the intermediate region together with the outer shape of the split core pieces to separate and form the individual split core pieces. And a caulking and laminating station for performing a caulking and laminating step of laminating and laminating on the lower divided core pieces formed by punching.

    In the method for manufacturing a laminated core and the mold apparatus according to the present invention, the connecting portion of the adjacent split core pieces sandwiching the intermediate region is sheared and the intermediate region is bent, and then the bent intermediate region is pushed back. In the same manner as in the case of manufacturing a circumferentially-integrated laminated core, even though the divided core pieces adjacent to each other across the intermediate region are separated by forming the same level with the thin plate material, It becomes possible to manufacture a circumferentially divided type laminated iron core.

  Thus, since it can be manufactured in the same manner as the circumferentially integrated laminated core, the core pieces constituting the laminated core (stator core) are placed on the same strip steel plate W together with the core pieces constituting the rotor core. It is possible to manufacture materials and manufacture a laminated core (stator core) together with the rotor core in the same progressive mold apparatus.

  Thus, according to the method for manufacturing a laminated core and the mold apparatus according to the present invention, it is possible to improve the productivity associated with the production of the circumferentially divided type laminated core, and to achieve a reduction in production costs. It becomes possible.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 and 2 show an embodiment of a laminated core (stator core) constituting an electric motor manufactured by a mold apparatus according to the present invention based on a method for manufacturing a laminated core according to the present invention. The laminated core 1 includes a ring-shaped yoke portion 2 and a predetermined number of teeth portions 3, 3... Protruding inward of the yoke portion 2.

  The laminated core 1 is configured by connecting a predetermined number of divided laminated cores 10, 10 to each other endlessly, and each divided laminated core 10 is a part of the yoke portion 2 in the laminated core 1. And a teeth portion 10T constituting one of the plurality of teeth portions 3, 3... In the laminated core 1 are provided.

  The divided laminated core 10 is configured by caulking and laminating a predetermined number of divided core pieces 11, and the divided core piece 11 includes a divided yoke portion 11Y and a tooth portion 11T. At both ends of the portion 11Y, a fitting convex portion 11A and a fitting concave portion 11B are formed as connecting portions, respectively.

  Specifically, a fitting convex portion (connecting portion) 11A that protrudes in the circumferential direction in the central region is formed at one end portion (end portion on the counterclockwise direction) of the divided yoke portion 11Y. A fitting recess (connecting portion) 11B that is recessed in the circumferential direction in the central region is formed at the end portion (the end portion on the clockwise direction side).

  As a result, in the divided laminated core 10 formed by caulking and laminating the divided core pieces 11 having the above-described form, convex portions extending in the height direction of the divided laminated core 10 are formed at one end and the other end of the divided yoke portion 10Y. A fitting convex portion (connecting portion) 10A made of a strip and a fitting concave portion 10B (connecting portion) made of a concave groove are respectively defined.

  The predetermined number of divided laminated cores 10, 10... Constituting the laminated core 1 are formed by connecting a fitting convex portion 10 A in one divided laminated core 10 adjacent to each other and a fitting concave portion 10 B in the other divided laminated core 10. The ring-shaped yoke portions 2 are formed by the divided yoke portions 10Y, 10Y,... Of the divided laminated iron cores 10, 10,.

Below, the method to manufacture the laminated core 1 of the structure mentioned above is demonstrated.
FIG. 3 shows an example of material removal for the strip steel plate (thin plate material) W when the laminated iron core manufacturing method according to the present invention is carried out. On the strip steel plate W, a predetermined number of divided core pieces are shown. 11, 11... Are taken out in the form of a ring by being connected to each other with intermediate regions 12, 12.

  Further, on the strip-shaped steel plate W, a rotation constituting a rotor core (not shown) is formed in the central region of a predetermined number of divided core pieces 11, 11... The core core piece 20 is materialized. That is, as with the material removal (see FIG. 11) when manufacturing the circumferentially integrated laminated core, the core piece constituting the rotor core and the core piece constituting the stator core are the same strip steel plate W. The material is taken up above.

  4 to 6 are plan views of a strip steel plate (thin plate material) W processed by a progressive die device (die device) according to the present invention based on the method for manufacturing a laminated core according to the present invention. The progressive die apparatus for manufacturing the laminated core 1 includes a cutting and bending station S1, a pushback station S2, a slot removing station S3, an inner diameter removing station S4, a first crimping portion forming station S5, and a second crimping portion forming station. S6, idle station S7, and outer diameter caulking coupling station S8 are provided.

  Here, the progressive die apparatus includes a processing station for manufacturing a rotor core (not shown) by sequentially forming the rotor core pieces 20 prior to the above-described stations S1 to S8. Therefore, the rotor core and the stator core are manufactured by a common progressive mold apparatus as in the case of manufacturing the circumferentially integrated type laminated core.

  In the manufacturing process of the laminated core 1 by the progressive die apparatus described above, first, the outer diameter of the rotor core piece 20 is removed (caulking lamination) at a preceding processing station (not shown) to form a round hole-shaped opening O. After that, in the cutting and bending station S1, the yoke portion forming region on the strip steel plate (thin plate material) W, that is, the portion where the divided yoke portions 11T, 11T... In addition, the connecting portion 11A and the connecting portion 11B between the adjacent core segments 11 sandwiching the intermediate region 12 are sheared and separated from the intermediate region 12, and the intermediate region 12 is set down from the strip steel plate W. (Cut bending process).

  Here, the fitting convex portion 11A and the intermediate region 12 in one of the divided core pieces 11 sandwiching the intermediate region 12 extend along the outline of the fitting convex portion 11A as shown in FIG. The steel sheet W is sheared and separated on the slit line L1 reaching the outer diameter area and the inner diameter area of the yoke portion forming area, and the fitting recess 11B and the intermediate area 12 in the other divided core piece 11 are fitted. Shear separation is performed on a slit line L2 that extends along the outer shape line of the recess 11B and reaches the outer and inner diameter regions of the yoke portion forming region on the strip steel plate W.

  Further, as shown in FIGS. 8A and 8B, in the cutting station S1, the strip steel plate W is sheared and separated along the slit lines L1 and L2 by the cooperative action of the punch P and the die D. At the same time, as the punch P is lowered, the intermediate region 12 is bent downward. That is, in the cutting and bending station S1, so-called slit foam is performed in which the strip steel plate W is sheared and bent at the same time.

  The die D of the cutting and bending station S1 is provided with a pushback slider Q that is biased upward by a spring V in order to support bending of the intermediate region 12.

  The slit line L1 and the slit line L2 have an end shape including the fitting convex portion 11A in the divided core piece 11 and an end shape including the fitting concave portion 11B in the divided core piece 11, respectively. Needless to say, the shape can be appropriately set without being limited to the embodiment as long as the shape can be a desired shape.

  As described above, in the cutting and bending station S1, the intermediate region 12, the fitting convex portion 11A, and the fitting concave portion 11B are shear-separated, and the intermediate region 12 is bent and then bent in the pushback station S2. The intermediate region 12 is pushed back to be flush with the strip steel plate W (pushback process).

  That is, as shown in FIGS. 9A, 9B and 9C, the strip steel plate W is sandwiched between the die D and the stripper plate SP, and the bent intermediate region 12 is faced by the lower surface of the stripper plate SP. Thus, the intermediate region 12 is pushed back so as to be flush with the strip steel plate W.

  As described above, after the bent intermediate region 12 is formed flush with the strip steel plate W in the pushback station S2, a predetermined number of slots S, S... A predetermined number of teeth portions 11T, 11T,... Are formed with the opening O as the center (slot removal step).

  At this time, by punching and forming the slots S, S..., The portions occupied inwardly from the yoke portion forming region in the intermediate regions 12, 12.

  As described above, after the tooth portions 11T, 11T,... Are formed in the slot removal station S3, the tooth tips 11t in the respective tooth portions 11T are punched and formed in the inner diameter removal station S4 (inner diameter removal step).

Next, in the first caulking part forming station S5 and the second caulking part forming station S6, the caulking parts 11C, 11C,.
That is, in the first caulking portion forming station S5, only the lowermost divided core piece 11 constituting one laminated iron core 1 is cut to remove the protruding portion of the caulking portion 11C, and the second caulking portion is formed. In the forming station S6, the protruding portion of the crimped portion 11C is bent (bent) into a predetermined shape with respect to the divided core pieces 11 other than the lowermost layer.

  Next, in the caulking coupling station S8 with the outer diameter removed after passing through the idle station S7, the outer diameter of each divided core piece 11 is punched out together with the outer diameter in the intermediate regions 12, 12,. , 11... Are formed in a predetermined shape, and the adjacent divided core pieces 11 can be separated from each other with the intermediate region 12 interposed therebetween.

  Further, in the caulking coupling station S8 without outer diameter, each of the divided core pieces 11, 11,... Formed in a predetermined shape is laminated on the previously formed divided core pieces 11, 11,. Each of the caulking portions 11C, 11C,... Is caulked and joined to each other (caulking stacking step).

  That is, in the outside diameter caulking / combining station S8, each of the divided core pieces 11, 11,... Is punched and formed, and a predetermined number of divided core pieces 11 are stacked and joined together by a predetermined number of pieces. The laminated iron cores 10, 10... Are manufactured, and as shown in FIG. 10, the intermediate bodies 12A, 12A... Laminated with the intermediate pieces 12a formed by punching the main part of the intermediate region 12 from the strip steel plate W are sandwiched. An annular intermediate product 1 ′ in which a number of divided product cores 10, 10... Are connected in an endless manner is produced.

  Here, as described above, a predetermined number of divided core pieces 11, 11,... And intermediate regions 12, 12,. The split core pieces 11, 11... Punched and formed at the outer diameter press caulking coupling station S8 are held in a squeeze ring (not shown) in the mold together with the intermediate piece 12a, and compressed from the outer periphery by the squeeze ring. By applying the force, the divided core pieces 11 that are sequentially punched and formed can be automatically caulked and laminated in a mold (squeeze ring).

  After the annular intermediate product 1 'is taken out from the progressive die apparatus, as shown in FIG. 11, the split laminated iron cores 10, 10 ... and the intermediate bodies 12A, 12A ... are separated, and the intermediate bodies 12A, 12A ... are scrapped. On the other hand, a predetermined number of divided laminated iron cores 10, 10... Are assembled into endless shapes by assembling the fitting convex portions 10A and the fitting concave portions 10B. The laminated iron core 1 exhibiting the above will be completed.

  As described above, in the method for manufacturing a laminated core according to the present invention, the fitting convex portion 11A and the fitting concave portion 11B of the divided core piece 11 adjacent to each other with the intermediate region 12 interposed therebetween are sheared and separated from the intermediate region 12. After bending the intermediate region, the bent intermediate region 12 is pushed back and formed flush with the strip-shaped steel plate W, so that the adjacent core pieces 11 are separated from each other across the intermediate region 12. Nevertheless, the circumferentially divided laminated core 1 can be produced in the same manner as in the case of producing a circumferentially integrated laminated core.

  Thus, since the circumferentially divided laminated core 1 can be manufactured in the same manner as the circumferentially integrated laminated core, a predetermined number of divided core pieces 11 constituting the divided laminated core 10 of the laminated core 1 are As shown in FIG. 3, it is possible to take the material in the form of being connected in a ring shape, and therefore, compared with the conventional manufacturing method (see FIG. 13) in which the divided iron core pieces are arranged on the strip steel plate and the material is taken. The yield of materials related to manufacturing can be remarkably improved, and productivity can be improved and manufacturing cost can be reduced.

  Further, since the circumferentially divided laminated core 1 can be manufactured in the same manner as the circumferentially integrated laminated core 1, a predetermined number of divided core pieces 11 constituting the divided laminated core 10 of the laminated core 1 are shown in FIG. As shown in FIG. 5, it is possible to take the material on the same strip steel plate W together with the rotor core piece 20, and thus, the laminated core 1 can be manufactured together with the rotor core using the same progressive die apparatus. Costs related to the production of the laminated core 1 and thus the production cost of the entire electric motor including the stator core and the rotor core can be greatly reduced.

  By the way, the stator of the electric motor using the above-described laminated iron core 1 is formed by winding the teeth 10T of the separated individual laminated iron cores 10 and then fitting the fitting protrusions 10A and the fitting depressions 10B with each other. It will be completed by assembling and connecting a predetermined number of divided laminated iron cores 10, 10, ... endlessly.

  Here, the fitting convex portion 11A and the fitting concave portion 11B of the divided iron core piece 11 constituting the fitting convex portion 10A and the fitting concave portion 10B of the divided laminated iron core 10 are adjacent to each other as described above. Since the material is removed with the intermediate region 12 interposed therebetween, the intermediate region 12 faces the intermediate region 12, so that the shape can be freely set by using the intermediate region 12 as a machining allowance.

  Thus, in the method for manufacturing a laminated core according to the present invention, the shape of the fitting convex portion 11A and the fitting concave portion 11B of the divided core piece 11 does not cause backlash when the divided laminated cores 10 are assembled together. By setting the desired shape in which a desired fitting allowance is set, the shape accuracy of the laminated core 1 formed by assembling a predetermined number of divided laminated cores 10, 10... Becomes very good.

  In the above-described embodiment, the connecting portions provided at both ends of the divided yoke portion 10Y in the divided laminated core 10 (the connecting portions provided at both ends of the divided yoke portion 11Y in the divided iron core piece 11) are respectively fitted. Although it comprises the convex part and the fitting concave part, it is needless to say that the shape of the connecting part is not limited to the example, and can be appropriately set based on various conditions such as the specifications of the laminated iron core.

  In the embodiment described above, the cutting and pushing back steps are performed in separate cutting and bending stations S1 and S2. However, the parts bent by the push back slider Q of the cutting and bending station S1 are used. Can be completely pushed back, the pushback station S2 can be omitted, and the cutting and pushing back process can be performed at the cutting and bending station S1.

  Further, in the first caulking part forming station S5 and the second caulking part forming station S6, a caulking part is also formed in an intermediate region on the strip-shaped steel plate W, and an intermediate body 12A is formed in the caulking coupling station S8 with the outer diameter removed. The intermediate pieces 12a can also be integrated by caulking, so that when the annular intermediate product 1 'is handled, the intermediate pieces 12a, 12a,... Do not fall apart, thereby obtaining good workability. Can do.

  Further, in the above-described embodiment, the split laminated cores 10, 10... Are manufactured by caulking and laminating each of the split core pieces 11, 11. However, it is also possible to apply a predetermined skew angle to each of the divided core pieces 11, 11... And to roll the divided core pieces 11, 11. Needless to say, can be implemented alone or in combination with skew.

BRIEF DESCRIPTION OF THE DRAWINGS The whole top view which shows one Example of the laminated iron core manufactured with the manufacturing method concerning this invention, and a metal mold apparatus. (a) And (b) is the top view and side view of the division | segmentation laminated | stacked iron core which comprise the laminated iron core shown in FIG. The principal part top view of the strip | belt-shaped steel plate which shows the material removal of the rotor core piece and stator core piece at the time of manufacturing the laminated iron core shown in FIG. The top view of the strip | belt-shaped steel plate which showed the manufacturing process in each station of the progressive die apparatus in the manufacturing method of the laminated core concerning this invention. The top view of the strip | belt-shaped steel plate which showed the manufacturing process in each station of the progressive die apparatus in the manufacturing method of the laminated core concerning this invention. The top view of the strip | belt-shaped steel plate which showed the manufacturing process in each station of the progressive die apparatus in the manufacturing method of the laminated core concerning this invention. (a) is a principal part top view of the strip | belt-shaped steel plate in 1 process in the middle of manufacture, (b) is the bb sectional view taken on the line in (a). (a) And (b) is a conceptual diagram which shows the processing aspect of the strip | belt-shaped steel plate in 1 process in the middle of manufacture. (a), (b) and (c) are the conceptual diagrams which show the processing aspect of the strip | belt-shaped steel plate in 1 process in the middle of manufacture. The top view which shows the division | segmentation laminated | stacked iron core in 1 process in the middle of manufacture. The top view which shows the division | segmentation laminated | stacked iron core in 1 process in the middle of manufacture. The external view which shows the conventional laminated iron core. The top view of the strip | belt-shaped steel plate at the time of manufacturing the laminated iron core shown in FIG. The external view which shows the other conventional laminated iron core. (a) is a top view of the strip steel plate at the time of manufacturing the laminated iron core shown in FIG. 14, (b) is a principal part top view of the strip steel plate in 1 process in the middle of manufacture. (a) And (b) is a top view of the strip | belt-shaped steel plate at the time of manufacturing the laminated iron core shown in FIG.

Explanation of symbols

1 ... laminated iron core,
2 ... Yoke part,
3 ... Teeth club,
10: Divided laminated iron core,
10Y: Divided yoke part,
10T ... Teeth club,
10A ... fitting convex part (connection part),
10B: fitting recess (connecting portion),
11 ... split core pieces,
11Y: Divided yoke part,
11T ... Teeth club,
11A ... fitting convex part (connection part),
11B: fitting recess (connecting portion),
20 ... Rotor core piece,
S1 ... Cutting and bending station,
S2 ... Pushback station,
S3 ... Slot removal station,
S4 ... Inner diameter removal station,
S8 ... Outer diameter caulking coupling station,
W: Strip steel plate (thin plate material).

Claims (2)

A predetermined number of divided cores, each of which has a split yoke portion and a teeth portion, and has connecting portions at both ends of the split yoke portion, are connected endlessly to each other by a predetermined number. A manufacturing method of a laminated core for manufacturing a stator core comprising a ring-shaped yoke portion and a predetermined number of teeth portions projecting inwardly of the yoke portion,
After the rotor core pieces are formed by punching from a thin plate material, in the yoke portion forming region in which the divided core pieces are connected to each other with the intermediate region interposed therebetween, the connection of the divided core pieces adjacent to each other with the intermediate region interposed therebetween A cutting and bending process of shearing and separating the part and bending the intermediate region;
A pushback step of pushing back the intermediate region bent in the thin plate material to form flush with the thin plate material;
A slotting step for forming a predetermined number of teeth by punching a predetermined number of slots in the thin plate material;
An inner diameter punching process for punching and forming tooth tips in the predetermined number of teeth portions;
Caulking lamination in which the intermediate region is punched together with the outer shape of the split core pieces to separate and form the individual split core pieces, and the split core pieces are stacked and joined to the lower split core pieces formed by punching first. Process,
A method for producing a laminated iron core, comprising: A predetermined number of divided cores are formed by caulking and stacking, and a predetermined number of divided cores having a split yoke portion and a teeth portion and connecting portions at both ends of the split yoke portion are connected endlessly. A mold apparatus for manufacturing a stator core comprising a ring-shaped yoke portion and a predetermined number of teeth portions projecting inwardly of the yoke portion,
After the rotor core pieces are formed by punching from a thin plate material, in the yoke portion forming region in which the divided core pieces are connected to each other with the intermediate region interposed therebetween, the connection of the divided core pieces adjacent to each other with the intermediate region interposed therebetween A cutting and bending station for performing a cutting and bending process of shearing and separating parts and bending the intermediate region;
A pushback station for performing a pushback step of pressing back the intermediate region bent in the thin plate material and forming the same with the thin plate material;
A slotting station for performing a slotting step of forming a predetermined number of teeth by punching and forming a predetermined number of slots in the thin plate material;
An inner diameter punching station for performing an inner diameter punching step of punching and forming tooth tips in the predetermined number of teeth portions;
Caulking lamination in which the intermediate region is punched together with the outer shape of the split core piece to separate and form the individual split core pieces, and the split core pieces are stacked on the lower split core pieces formed by punching first and then joined together by caulking An outside diameter caulking coupling station for carrying out the process;
A mold apparatus comprising:

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