JP2808555B2 - Method and apparatus for manufacturing laminated iron core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention forms a stamped steel sheet by sequentially performing various press workings while intermittently transferring a strip-shaped steel sheet. The present invention relates to a method and an apparatus for manufacturing a laminated core in which a laminated core is formed by laminating in order. [Prior Art] There are many types of laminated iron cores of this kind, and a star-shaped laminated iron core used for an armature core of a rotating electric machine will be described below as an example. FIG. 3 shows an example of a star-shaped laminated core 1. The laminated core 1 is formed by laminating a plurality of stamped steel plates 2 formed in a star shape. Each punched steel plate 2 has an annular portion having a rotation shaft fixing hole 2a in the center, a plurality of winding portions 2b, 2b,... Extending radially protruding from the outer periphery of the outer annular portion. It has a magnetic pole surface portion 2c formed at the outer end of 2b, and a winding slot 2d between adjacent winding portions 2b, 2b. Such a stamped steel plate 2
As shown in FIG. 7, the punched steel plates 2 adjacent to each other in the laminated core 1 formed by laminating a plurality of pieces are positioned by fitting the locking concave portions 2e or the locking holes 2f with the locking convex portions 2g. Have been. The laminated core 1 configured as described above is shown in FIGS.
As shown in the drawing, the strip-shaped steel sheet 3 is intermittently and sequentially transferred to a press machine (not shown) at the same pitch, and the punched steel sheet forming portion 3a of the strip-shaped steel sheet 3 is sequentially punched. Is formed by forming a punched steel plate 2 by applying the above-mentioned press working, and laminating the punched steel plate 2 in the order of formation.
Therefore, when the conventional manufacturing apparatus sequentially and intermittently transfers the strip-shaped steel sheet 3, the punched steel sheet forming portions 3a, 3
A press machine having a first stage A to a fifth stage E for sequentially performing press working on a,... is provided. This press machine has a punch 4 and a die 5, and the punch 4 is moved toward the strip-shaped steel sheet 3 which is sequentially intermittently transferred, and is lowered at every intermittent feed. Strip-shaped steel sheet 3 forming the stamped steel sheet 2 located
When forming the locking hole 2f in the punched steel plate forming portion 3a,
And the second punch holder 7 which is lowered toward the strip-shaped steel plate 3 together with the punch holder 6 and is stopped at the upper retreat position at other times. The first punch holder 6 supports a punch body group 8 extending toward the die 5, and the punch body group 8 and the die 5
A stripper 9 is disposed between the first and second punch holders 6 to press the band-shaped steel plate 3 before the first punch holder 6 descends and the punch body group 8 comes into contact with the band-shaped steel plate 3. The punch body group 8 includes the first stage A to the fifth stage E
Steel sheet 3 intermittently transferred in each processing stage up to
Are pressed simultaneously at the stamped steel plate forming portions 3a. At the portion of the first punch holder 6 located at the first stage A, two pilot punch main bodies 8a for opening the pilot holes 3b are supported, and at positions facing the respective pilot punch main bodies 8a of the die 5, guide posts are provided. Pilot die hole 5a is formed. A punch body 8b for punching a rotary shaft fixing hole 2a is supported by a punched steel plate forming portion 3a of the strip-shaped steel plate 3 at a portion of the first punch holder 6 located at the second stage B. A punching die hole 5b is formed at a position facing the punching punch body 8b. A second punch holder 7 is further disposed on the second stage B. The second punch holder 7 has a laminated core 1
A plurality of punching punch bodies 7a which move down together with the first punch holder 6 only when the locking holes 2f are opened in the punched steel plate 2 located at the lower end of the punching steel plate 2 are provided. The second punch holder 7 has a recess 10 formed in the first punch holder 6.
It is designed to be stored inside. A portion of the die 5 located on the second stage B includes a plurality of punching punch bodies.
A plurality of punching die holes 11a corresponding to 7a are formed. Two guide posts (not shown) are also supported on a portion of the first punch holder 6 located on the second stage B, and guide holes (not shown) into which the respective guide posts are inserted in the die 5. .) Is formed. These guide posts are inserted into pilot holes 3b formed in the punched steel plate forming portion 3a of the strip-shaped steel plate 3 by the pilot punch body 8a of the first stage A, and perform positioning of the strip-shaped steel plate 3 in the second stage B. . In a portion of the first punch holder 6 located at the third stage C, a window for forming a winding slot 2d of the stamped steel plate 2 is provided.
A plurality of first punching punch bodies 8c for punching and forming 3c into a punched steel sheet forming portion 3a of the strip-shaped steel plate 3 are supported, and the die 5 has a plurality of punching punch bodies 8c respectively corresponding to the plurality of first punching punch bodies 8c. The first punching die hole 5c is formed. Also in the third stage C, the first punch holder 6
Are supported by two guide posts (not shown), and guide holes (not shown) corresponding to the two guide posts are formed in the die 5. A plurality of embossing punch bodies 8d for forming a locking concave portion 2e and a locking convex portion 2g in each punched steel plate 2 are supported on a portion of the first punch holder 6 located on the fourth stage D. I have. These multiple embossing punch bodies 8d
Are provided at positions corresponding to the plurality of punching punch bodies 7a of the second stage B, respectively. A plurality of embossing die holes 5d respectively corresponding to the plurality of embossing punch bodies 8d are formed in a portion of the die 5 located at the fourth stage D. Similarly, in the fourth stage D, two guide posts are supported by the first punch holder 6 and two guide holes are formed in the die 5. In the portion of the first punch holder 6 located at the fifth stage E, the magnetic pole surface portion 2c of the punched steel plate 2 is punched from the punched steel plate forming portion 3a of the strip-shaped steel plate 3 from which the window portion 3c has been punched in the third stage C. A circular second punching punch body 8e for extracting the punched steel plate 2 from the strip-shaped steel plate 3 is supported. Dice 5
In the portion located at the fifth stage E, a circular second punching die hole 5e corresponding to the second punching punch body 8e is provided.
Are formed. In the fifth stage E, similarly to the second stage B to the fourth stage D, two guide posts and guide holes corresponding to the guide posts are provided in the first punch holder 6 and the die 5, respectively. A pilot punch body 8a, a punch body 8b, a punch body 7a, a first punch body 8c,
The punch body 8d for embossing, the punch body 8e for second punching, and the respective guide posts from the second stage B to the fifth stage E are provided so as to penetrate the stripper 9 vertically movably. A conventional method of manufacturing the laminated iron core 1 using such a manufacturing apparatus will be described with reference to FIGS. In the conventional manufacturing method, each stamped steel plate forming portion 3a of the strip-shaped steel plate 3 is placed between the stripper 9 and the die 5 of the press machine.
, And the strip steel plate 3 is subjected to press working in each stage at the same time. The first stage A to the fifth stage E are intermittently transported by a distance corresponding to one stage.
Pressing is performed sequentially. Each of the punched steel plate forming portions 3a of the strip-shaped steel plate 3 is subjected to press working in stages A to E repeatedly. Next, the press working performed in each stage will be described. When the strip holes 3 are supplied to the press machine, in the first stage A, pilot holes 3b (hatched portions) are formed in the punched steel plate forming portions 3a of the strip steel plates 3. When the pressing in the first stage A is completed and the strip-shaped steel plate 3 is transferred by a distance (one pitch) corresponding to one stage, the punched steel plate forming portion 3a processed in the first stage A is formed. Second stage B
Reach In the second stage B, a guide post (not shown) is inserted into the pilot hole 3b to position the punched steel plate forming portion 3a, and the rotary shaft fixing hole 2a is formed in the punched steel plate forming portion 3a. The positioning of the punched steel plate forming portion 3a by inserting the guide post into the pilot hole 3b in this manner is the same in each subsequent stage. In the second stage B, the punched steel plate 2 positioned at the lower end of the laminated core 1 is lowered by synchronizing the second punch holder 7 with the first punch holder 6 and lowering the same.
Only a plurality of locking holes 2f are formed. This second stage B
In the case where the punched steel plate 2 other than the punched steel plate 2 located at the lower end of the laminated core 1 is formed, the punching punch main bodies 7a of the second punch holder 7 are moved to the retracted position away from the die 5. Stopped in a evacuated state. When the processing in the second stage B is completed and the strip-shaped steel sheet 3 is next transferred by one pitch, the punched steel sheet forming portion 3a processed in the second stage B reaches the third stage C, and the third stage C In the stamped steel plate forming part 3a, there are multiple winding slots
The window portion 3c (shaded portion) forming 2g is punched to form a part of the contour of the winding portion 2b. After finishing the processing in the third stage C, the band steel plate 3
After the pitch transfer, the punched steel sheet forming portion 3a processed in the third stage C reaches the fourth stage D. In the fourth stage D, a locking concave portion 2e and a locking convex portion 2g (shaded portion) are formed in the punched steel plate forming portion 3a by embossing. When the portion where the locking hole 2f is formed on the second stage B moves to the fourth stage D, each embossed punch body 8d is fitted into each locking hole 2f already formed in the punched steel plate forming portion 3a. It is inserted and an empty process is performed. After finishing the processing in the fourth stage D, the band-shaped steel plate 3
After the pitch transfer, the punched steel plate forming portion 3a processed in the fourth stage D reaches the fifth stage E. In the fifth stage E, the pole face portion 2c of the punched steel plate 2 located between the windows 3c punched in the third stage C is cut, and the star-shaped punched steel plate 2 (shaded portion) is cut into the band-shaped steel plate 3. It is extracted from the punched steel plate forming portion 3a. This processing is similarly performed sequentially on each of the punched steel plate forming portions 3a of the subsequent strip-shaped steel plate 3. As shown in FIG. 7, first, when the punched steel plate 2 having the plurality of locking holes 2f formed in the second stage B comes out of the fifth stage E, the punched steel plate is positioned. Next, in the fourth stage D, when the punched steel sheet 2 having the plurality of locking recesses 2e and the locking protrusions 2g has exited the fifth stage E, the punched steel sheet is replaced with the first punched steel sheet 2. And the locking projections 2g of the punched steel plates stacked in the locking holes 2f are fitted. Subsequently, similarly, in the fourth stage D, the locking convex portion 2g of the punched steel plate in which the locking concave portion 2e and the locking convex portion 2g are formed is fitted to the locking concave portion 2e of the already punched steel plate 2. Then, when a predetermined number of punched steel plates are stacked, the laminated body is pressed to connect each punched steel plate 2 to an adjacent punched steel plate to form the laminated core 1. Next, the winding winding portion 12 of the laminated core 1 is coated with a resin insulating coating 13, and a winding 14 is wound over the coating 13. [Problems to be Solved by the Invention] In the conventional manufacturing method, as described above, in particular, the wound wire-wound portion 2b of the stamped steel plate 2 is punched from the same direction, and they are sequentially laminated to form the laminated iron core 1. After that, the winding winding portion 12 of the laminated core 1 is coated with a resin insulating coating 13, and the winding 14 is wound on the coating 13. However, according to such a method, as shown in FIG. 7, the punched burrs a generated downward during the punching process of the winding wound portion 2b of the punched steel sheet 2 located at the lower end of the laminated core 1 Since the projections protrude from the corners at the lower end, the punched burs a cause a problem that the resin insulating film 13 is damaged when the windings 14 are wound, thereby causing dielectric breakdown. Conventionally, in order to eliminate this dielectric breakdown, a punched burr a
In order to prevent damage to the resin insulation film 13 by applying shot blasting or face pressing to the surface, these processes increase the number of man-hours, so that costs can be avoided. Did not. In particular, when a method of performing face pressing on the punched burrs a is employed, the shape of the laminated core 1 is broken, and a process for correcting the shape is required, which is troublesome. Further, by inverting the punched steel plate 2 located at the lower end of the laminated core 1 and turning the punched burrs a toward the upper end side of the core, the punched burrs a are prevented from protruding from the corners at the lower end in the laminating direction of the core. There is a way to do this,
Since the number of steps for inverting the punched steel plate 2 at the lower end of the laminated core is increased, the number of steps is increased and the cost is increased. . An object of the present invention is to provide a method for manufacturing a laminated core, which reduces the number of processing steps and eliminates the possibility of causing dielectric breakdown due to punched burrs, and a manufacturing apparatus used for performing the manufacturing method. [Means for Solving the Problems] The manufacturing method of the present invention will be described with reference to FIGS. 1 to 4 showing an embodiment thereof. The method of the present invention comprises a plurality of stamped steel sheets 2, 2 having a winding wound portion 2b by sequentially performing various press workings while intermittently transferring the strip-shaped steel sheet 3.
Are sequentially formed, the plurality of punched steel sheets are laminated in the order in which they are formed, and in the process of laminating the plurality of punched steel sheets, the locking recesses 2e formed in one of the adjacent punched steel sheets 2, 2 or The present invention relates to a method for manufacturing a laminated core, in which a plurality of stamped steel plates are joined together by fitting a locking hole 2f and a locking projection 2g formed on the other side to form a laminated core 1. Laminated core 1
When punching the punched steel plate 2 located at least at the lower end in the laminating direction, the inside of the contour of the punched steel plate is punched, and at least the winding of the punched steel plate 2 located at least at the upper end in the laminating direction of the laminated core 1 When punching the wound part, the outside of the contour of the wound part is punched. The second invention of the present application is a manufacturing apparatus for carrying out the above method, wherein the first punch holder 6 and the lower end of the laminated iron core 1 descend toward the strip-shaped steel sheet 3 which is sequentially and intermittently conveyed. When the locking hole 2f is formed in the punched steel plate forming portion 3a of the strip steel plate 3 forming the punched steel plate 2 located at the position shown in FIG. When punching outside the contour of the winding part from the punched steel sheet forming part 3a, the first punch holder 6
The second punch holder 7 which is lowered toward the strip-shaped steel plate 3 together with the second punch holder 7 and is stopped at the upper retreat position at other times.
And a die 5 arranged so as to face both punch holders 6 and 7. The first punch holder 6 includes an embossing punch body 8d that forms a locking concave portion 2e and a locking convex portion 2g in a punched steel plate forming portion 3a of the strip-shaped steel plate 3, and at least a lower end of the laminated core 1 in the laminating direction. Steel plate 3 forming the punched steel plate 2 located at
Punched steel plate 2 located at the lower end from the punched steel plate forming portion 3a
And a second punching punch main body 8e for punching the inside of the outline of the punched steel plate forming portion 3a of the strip-shaped steel plate 3 forming the punched steel plate 2 located at the lower end. Punching punch body 7a for opening the locking hole 2f and the laminated core 1
From the punched steel plate forming portion 3a of the strip-shaped steel plate 3 forming the punched steel plate 2 located at least at the upper end in the laminating direction of the outside of the contour of the winding winding portion of the punched steel plate 2 located at the upper end. One punching punch main body 8c is supported. The punch 7a for punching is arranged at a processing position in front of the punch body 8d for embossing, and the punch 8d for embossing.
Is disposed at a processing position in front of the second punching punch body 8e. The first punch body 8c is a second punch body.
Are arranged at processing positions in front of the punching punch main body 8e, and the dies 5 have die holes 5a to 5c corresponding to the punch main bodies 8a to 8e and 7a supported by the first punch holder 6 and the second punch holder 7, respectively. 5e and 11a are formed. [Operation] As described above, when punching a punched steel sheet located at least at the lower end in the stacking direction of the laminated core, the inside of the contour of the punched steel sheet is punched, and the punched steel sheet is positioned at least at the upper end in the stacking direction of the laminated core. At the time of punching at least the winding portion of the punched steel sheet, the outside of the contour of the winding portion is punched, so that at least the winding portions of the punched steel sheet located at both upper and lower ends in the laminating direction of the laminated core. Since the punching burrs formed on the winding portion do not protrude outward, the winding portion is coated with a resin insulating film, and when the winding is wound from above the coating, the coating is formed by the punching burrs. It will not be damaged. Therefore, there is no need to perform special processing for preventing dielectric breakdown on punched burrs as in the past,
The number of processing steps can be reduced. In particular, as in the manufacturing apparatus of the second invention, the second punching punch body for punching the inside of the contour of the punched steel sheet located at least at the lower end of the laminated core is supported by the first punch holder, and A first punch body for punching, which punches the outside of the contour of the wound portion of the punched steel sheet located at least at the upper end in the laminating direction, is supported by a second punch holder, and the first punch body is punched. When placed at the processing position before the punching punch body of No. 2, a series of punched steel sheets formed by sequentially performing press working on the punched steel sheet forming part of the strip-shaped steel sheet are sequentially laminated after being extracted at the final processing position. As a result, a laminated core having no punched burrs at the end edges of the corners at both ends in the laminating direction can be obtained, so that automation of the production of the laminated core can be easily achieved. Embodiment An embodiment of the present invention will be described below in detail with reference to FIGS. 1 to 4. 1 to 4, the same or corresponding parts as those in FIGS. 5 to 7 are denoted by the same reference numerals. The configuration of the manufacturing apparatus according to one embodiment of the present invention is as shown in FIG. 1 and is characterized by the configuration of the third stage C and the fifth stage E. That is, in the third stage C of the manufacturing apparatus of the present embodiment, the punched steel plate 2 located at the upper end of the laminated core 1 in the laminating direction is used.
A plurality of first punching punch bodies 8c for punching window portions 3c forming a plurality of winding slots 2d are arranged in a punched steel plate forming portion 3a of the strip-shaped steel plate 3 forming the punching. Each first
The punch body 8c for punching is provided so as to penetrate the first punch holder 6 so as to be vertically movable, and the upper end thereof is fixed to the second punch holder 7. A first punching die hole 5c corresponding to each first punching punch body 8c is formed in a portion of the die 5 located at the third stage C. In the portion of the first punch holder 6 located on the fifth stage E located on the fifth stage E, all the punched steel plates 2 except the punched steel plate 2 located on the upper end of the laminated core 1 in the laminating direction are provided.
From the punched steel plate forming portion 3a of the strip-shaped steel plate 3 forming the plurality of winding portions 2b and the plurality of pole face portions 2c of the punched steel plate 2 at the same time. Is supported. This second punching punch body 8e
An almost star shape corresponding to the shape of the punched steel plate 2 so that the inside of the outline of the plurality of winding portions 2b of the punched steel plate 2 and the inside of the outline of the plurality of pole face portions 2c (shaded portions in the figure) are punched. It is formed in the shape of. A second punching die hole 5e corresponding to the second punching punch body 8e is formed in a portion of the die 5 located at the fifth stage. Next, a characteristic portion of the manufacturing method of the present invention performed by using the manufacturing apparatus of the above embodiment will be described with reference to FIGS. In the present embodiment, in the third stage C, in order to obtain a punched steel sheet 2 located at the upper end of the laminated core 1, a plurality of winding slots 2d are formed from the punched steel sheet forming portion 3a of the strip-shaped steel sheet 3.
Are punched out to form the winding part 2b. In this case, the outside of the contour (hatched portion) of the winding portion 2b of the punched steel plate 2 located at the upper end of the iron core is punched. The punched steel plate is formed below the steel plate, and a punch sag b (see FIG. 4) is formed above the punched steel plate. A punched steel plate forming portion 3a of a strip-shaped steel plate to obtain another punched steel plate (a punched steel plate other than the punched steel plate located at the upper end of the laminated core) 2
Is located at the third stage C, each first punching punch body 8c is retracted to the upper retracted position to perform empty machining. In the fifth stage E, the inner side (shaded portion) of the outline of the punched steel plate forming portion 3a of the strip-shaped steel plate 3 is obtained in order to obtain all the punched steel plates 2 other than the punched steel plate 2 at the upper end of the laminated core 1. The punched steel sheet 2 is removed from the punched steel sheet forming portion 3a of the strip-shaped steel sheet 3 by punching with the punch body 8e for punching and the die hole 5e. In this case, since the inside of the outline of the winding part 2b of the punched steel sheet 2 is punched, the burrs a of the winding part are formed on the upper part of the punched steel sheet as shown in FIG. And a punch sag b is formed at the bottom. Also, a punched steel plate forming part where a plurality of windows 3c are punched in the third stage C
When 3a is supplied to the fifth stage E, the pole face portion 2c between the adjacent windows 3c, 3c is cut, and the star-shaped punched steel plate 2 is extracted from the punched steel plate forming portion 3a. A series of stamped steel sheets 2, 2,... Formed as described above are laminated in the order of formation, and a locking hole 2f or a locking recess provided in one of two adjacent punched steel sheets. When the laminated core 1 is formed by fitting the locking projection 2g provided on the other side with the locking projection 2g provided on the other side, the laminated core 1 obtained as shown in FIG. The edges of the corners at the upper and lower edges of both are formed by punch sagging b, and since the punching burrs of the punched steel plate 2 do not protrude outward, the winding winding part 12 is coated with a resin insulation film 13. Then, when the winding 14 is wound from above the coating 13, the resin insulating coating 13 is not broken and dielectric breakdown does not occur. In the above embodiment, the punching punch body 7a and the first punching punch body 8c are fixed to one second punch holder 7, but the present invention is not limited to this. The punch body 7a for punching and the punch body 8c for first punching may be individually fixed to two punch holders, respectively, to form a second punch holder by the two punch holders. In this case, the laminated core 1
Of the first punch body 8c so as to punch out the window 3c from each punched steel plate forming portion 3a of the strip-shaped steel plate 3 forming the punched steel plate 2 other than the punched steel plate 2 located at the lower end in the laminating direction. The punch holder can be operated. In the above embodiment, the plurality of dice holes 5a to 5e and 11a are formed in one die 5, but the present invention is not limited to this, and the dice holes are divided into a plurality of dice. It may be formed. In this case, it is necessary to position and fix a plurality of dies at predetermined positions. Further, in the above embodiment, the star-shaped laminated core 1 has been described, but the present invention is not limited to this, and can be applied to, for example, an I-shaped laminated core. [Effects of the Invention] As described above, according to the present invention, when punching a punched steel sheet located at least at the lower end in the stacking direction of the laminated core, the inside of the contour of the punched steel sheet is punched, When punching at least the winding part of the punched steel sheet located at least at the upper end in the laminating direction, since the outside of the contour of the winding part is punched, a series of punched steel sheets is formed. By simply laminating in order, it is possible to obtain a laminated iron core having no punched burrs at the upper and lower corners in the laminating direction, coating a resin insulating film on a winding winding portion of the laminated iron core, and applying It is possible to prevent the coating from being damaged by punching burrs when the winding is wound. Therefore, it is not necessary to perform special processing for preventing dielectric breakdown on the punched burrs, and the number of processing steps can be reduced. In particular, according to the second invention, the second punching punch body for punching the inside of the outline of the punched steel plate located at least at the lower end of the laminated core is supported by the first punch holder, and the laminated core in the laminating direction is laminated. A first punching punch body for punching at least an outer side of a contour of a winding portion of a punched steel sheet located at an upper end is supported by a second punch holder, and the first punching punch body is a second punching body. Since it was arranged at the processing position before the punch body, a series of punched steel sheets formed by applying stamping sequentially to the punched steel sheet forming part of the strip-shaped steel sheet, by extracting at the final processing position, and then sequentially laminating, It is possible to obtain a laminated core without punched burrs at the edges of the corners at both ends in the laminating direction, and it is possible to easily automate the production of the laminated core.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part showing an apparatus for manufacturing a laminated core according to one embodiment of the present invention, and FIG. 2 is a manufacturing apparatus shown in FIG. 3 is a plan view of a laminated iron core manufactured by the manufacturing apparatus and the manufacturing method of the present invention, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. FIG. 5 is a longitudinal sectional view of a conventional manufacturing apparatus of this type, FIG. 6 is a plan view of a strip steel sheet showing a state in which the strip steel sheet is pressed by the manufacturing apparatus shown in FIG. 5, and FIG. It is a longitudinal cross-sectional view of the winding winding part of the laminated iron core manufactured by the manufacturing apparatus and manufacturing method. 1 ... laminated iron core, 2 ... stamped steel plate, 2e ... locking recess, 2f
… Locking hole, 2g… Locking protrusion, 3… Strip steel plate, 3a…
Punched steel sheet forming portion of strip-shaped steel sheet, 6... First punch holder, 5... Die, 5b... Punching die hole, 5c.
Die hole for punching, 5d …… Die hole for embossing,
5e: second punching die hole, 8b: punching punch main body, 8c: first punching punch main body, 8d: embossing punch main body, 8e: second punching punch main body , 7... Second punch holder, 7a.

Claims (1)

(57) [Claims] Forming a plurality of punched steel sheets having a winding part by sequentially performing various press working while intermittently transporting the strip-shaped steel sheet, laminating the plurality of punched steel sheets in the order in which they were formed, In the process of laminating the plurality of punched steel plates, a plurality of punches are formed by fitting a locking concave portion or a locking hole formed on one of adjacent punched steel plates with a locking convex portion formed on the other. In the method for manufacturing a laminated core that forms a laminated core by combining steel plates, when punching a punched steel plate located at least at a lower end in a laminating direction of the laminated core, punching an inside of a contour of the punched steel plate, A method of manufacturing a laminated iron core, comprising punching at least the outer periphery of the wound portion of a stamped steel sheet at least at the upper end in the laminating direction of the laminated core. . 2. Forming a plurality of punched steel sheets having a winding part by sequentially performing various press working while intermittently transporting the strip-shaped steel sheet, laminating the plurality of punched steel sheets in the order in which they were formed, In the process of laminating the plurality of punched steel plates, a plurality of punches are formed by fitting a locking concave portion or a locking hole formed on one of adjacent punched steel plates with a locking convex portion formed on the other. In the apparatus for manufacturing a laminated core configured by combining steel sheets to form a laminated core, the first punch holder and the lower end of the laminated core, which are lowered at each intermittent feed, toward the strip-shaped steel sheet sequentially and intermittently conveyed, are located. When forming the locking hole in the punched steel sheet forming part of the strip steel sheet forming the punched steel sheet and from the punched steel sheet forming part of the strip steel sheet forming the punched steel sheet located at least at the upper end of the laminated core Of the winding part When punching the outside, the punch having the second punch holder lowered together with the first punch holder toward the strip-shaped steel plate, and otherwise stopped at the upper retracted position, A die arranged so as to face each other, wherein the first punch holder has an embossing punch body for forming the locking concave portion and the locking convex portion in a punched steel plate forming portion of the strip-shaped steel plate. And a second punch for punching the inside of the contour of the punched steel sheet located at the lower end from the punched steel sheet forming part of the strip-shaped steel sheet forming the punched steel sheet located at least at the lower end of the laminated core in the laminating direction. A main body is supported; the second punch holder includes a punching punch main body for forming the locking hole in a punched steel plate forming portion of a strip-shaped steel plate forming a punched steel plate located at the lower end; A first punching process for punching the outside of the contour of the winding portion of the punched steel plate located at the upper end from the punched steel plate forming portion of the strip-shaped steel plate forming the punched steel plate located at least at the upper end in the lamination direction of the iron core; The punch body is supported at a processing position in front of the embossing punch body, and the embossing punch body is located in a processing position ahead of the second punching body. The first punching punch main body is disposed at a processing position ahead of the second punching punch main body, and the die is supported by the first punch holder and the second punch holder. An apparatus for manufacturing a laminated core, wherein a die hole corresponding to each of the punch bodies is formed.