JP2005020972A - Manufacturing method and manufacturing device of laminated core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing device of a laminated core, by which a split type stator superior in magnetic characteristics and mechanical characteristics (rigidity) is obtained, without making a die and a press larger in size, even when the laminated core used for stators of intermediate- and large-sized rotary machines is manufactured. <P>SOLUTION: The manufacturing device includes the die having a single portion punching parts 5, 6 which selectively punch a concave portion 22a of an end or the other end of a single core piece 22, and a punching portion 7 as a whole which punches the single core piece 22 as a whole, a feeder 3 that feeds an electromagnetic steel plate 2 to the die 1, and a laminated portion 8a which receives the punched single core piece 22, wherein a laminating device is equipped, by which the single core piece 22 is arranged with a convex portion 22b and the concave portion 22a confronted each other, by causing the single core piece 22 received at the laminating portion 8a to move in order into a ring form. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for manufacturing a laminated iron core used for a stator such as a motor.
[0002]
[Prior art]
For a stator of a rotating machine, a laminated iron core formed by punching an electromagnetic steel sheet with a press to form a core piece and laminating the core pieces is used.
[0003]
In order to improve the space factor of the windings attached to the laminated iron core, a single core piece divided for each tooth is formed, and each single core piece is laminated to form a divided tooth, and the winding is applied to this divided tooth. After that, it is performed to assemble the laminated iron core on which the coil is mounted by joining the divided teeth.
[0004]
For example, a single core piece divided for each tooth is punched out with a press, laminated, and welded by laser welding to form a plurality of divided teeth, and then assembled by fitting the fitting portions of the divided teeth together. There is an iron core (for example, patent document 1).
[0005]
However, the laminated core for a split type stator assembled by fitting the divided teeth in this way has a poor magnetic property because the magnetic resistance at the fitting portion is large, and the mechanical property (rigidity) for fitting is poor. There is a problem of being bad.
[0006]
There exists what is assembled so that the edge part of a division | segmentation tooth may overlap with respect to this problem (for example, patent document 2).
[0007]
In addition, each tooth is connected at the thin part, and single core pieces arranged in a straight line are punched out with a press, the single core pieces are laminated to form a laminated iron core, and the teeth are bent at the thin part. There is one that increases the space factor of the winding by winding between the winding portions of the laminated iron core (for example, Patent Document 3).
[0008]
[Patent Document 1]
JP-A-7-298522 (page 2-3, FIG. 1)
[Patent Document 2]
JP 2000-201458 A (Page 5-6, FIGS. 1 and 2)
[Patent Document 3]
JP-A-9-191588 (page 4-5, FIGS. 1 and 2)
[0009]
[Problems to be solved by the invention]
In the manufacturing method of the laminated cores of Patent Documents 2 and 3, it is necessary to punch out a single core piece for one layer to be laminated with a press. There is a problem that a mold and a large press corresponding to the mold are required.
[0010]
Moreover, in order to punch out single core pieces arranged in a row in the horizontal direction, a wide strip-shaped electrical steel sheet is required, and in order to punch out single core pieces aligned in the vertical direction, a wide strip-shaped electrical steel sheet is used. Although not required, there is a problem that the transport distance of the steel plate becomes large and a high-speed transport device is required.
[0011]
The present invention solves the above-described problems, and even in the case of manufacturing a laminated core used for a stator of a medium-sized or large-sized rotating machine, the magnetic characteristics and mechanical characteristics are obtained without increasing the size of the mold and the press machine. An object of the present invention is to provide a method and an apparatus for manufacturing a laminated core from which a split stator having excellent (rigidity) is obtained.
[0012]
[Means for Solving the Problems]
The method for manufacturing a laminated core according to the present invention includes punching out an electromagnetic steel sheet to form a single core piece having a core back and a winding portion protruding from the core back, and forming divided teeth in which the single core pieces are laminated. In addition, in the method of manufacturing a laminated core that joins the divided teeth,
A first core piece having a convex portion formed at one end of the core back and a concave portion formed at the other end is punched out, and the convex portion and the concave portion of the first core piece are opposed to each other. Forming the first layer by arranging the first core pieces;
A second core piece having a convex portion and a concave portion formed on the core back in a direction opposite to the first core piece is punched, and the convex portion and the concave portion of the second core piece are formed. A second layer is formed by arranging the second core pieces to face each other, and the convex shape portion of the second core piece is overlapped with the convex shape portion of the first core piece to Laminating a second layer on the first layer;
A step of stacking the first layer on the second layer by superimposing the convex portion of the first core piece on the convex portion of the second core piece;
The step of laminating the second layer on the first layer and the step of laminating the first layer on the second layer are sequentially repeated to form a predetermined number of layers.
[0013]
An apparatus for manufacturing a laminated core according to the present invention punches electromagnetic steel sheets to form a single core piece having a core back and a winding portion protruding from the core back, and forms a divided tooth by laminating the single core pieces. In addition, in the manufacturing apparatus of the laminated iron core that joins the divided teeth,
The first core piece in which the convex portion is formed at one end of the core back and the concave portion is formed at the other end, and the convex portion and the concave portion are opposite to the first core piece. A mold for selectively punching the second core piece formed on the back;
A feeding device for conveying the electromagnetic steel sheet into a mold;
It has a laminated part which receives the 1st core piece and the 2nd core piece which were pierce | punched, and makes the said convex shape part and a concave shape part oppose by moving the core piece received in this laminated part sequentially A laminating apparatus for arranging the first core piece and the second core piece, respectively.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a plan view (a) and a side view (b) showing the configuration of the first embodiment of the laminated core manufacturing apparatus according to the present invention.
[0015]
In the drawing, an electromagnetic steel plate 2 that is an iron core material is conveyed into a mold 1 by a feeding device 3.
[0016]
The mold 1 includes a convex portion 22b in which the ends of the back core 22e of the single core piece 22 having a back core 22e and a winding portion 22f protruding from the back core 22e are fitted, and a concave portion in the concave portion 22a. An end punched portion 5, 6 for punching the shape portion 22 a and an entire punched portion 7 for punching the entire single core piece 22 including the convex shape portion 22 are provided. The end punched portion 5 has one end portion of the single core piece 22. Punching, the end punching part 6 punches the opposite end.
[0017]
The end punching portions 5 and 6 are configured so that either one can be selectively operated by a driving device such as a cylinder.
[0018]
The single core piece 22 punched out by the mold 1 is inserted into the laminating portion 8a of the laminating device 4 without collapsing by being guided by the guide pins 8. Thereafter, the stacking device 4 rotates the single core piece 22 inserted into the stacking portion 8a by the step motor 23 so that the next single core piece 22 can be inserted.
[0019]
FIG. 2 is a plan view showing how the laminated iron core is assembled in the laminating apparatus 4.
[0020]
First, the single core piece 22 punched by the end punching portion 5 and the overall punching portion 7 of the mold 1 is a convex of the adjacent single core piece 22 in the laminating apparatus 4 as shown in FIG. The next single core pieces 22 are sequentially inserted so that the shape portion 2b and the concave shape portion 2a fit together, thereby forming the first layer.
[0021]
Next, the single core piece 22 punched by the end punching portion 6 and the entire punching portion 7 of the mold 1 is adjacent to the first layer indicated by the broken line as shown in FIG. The next single core piece 22 is sequentially inserted so that the convex shape portion 22b and the concave shape portion 22a of the matching single core piece 22 are fitted, and the second layer is formed. At this time, since the directions of the convex shape portion 22b and the concave shape portion 2a are opposite in the first layer and the second layer, the convex shape portion 2b of the first layer and the convex shape portion 2b of the second layer. And the single core piece 22 of the second layer straddles the fitting portion between the convex portion 22b and the concave portion 22a of the first layer.
[0022]
Next, the third layer is formed by punching and stacking the single core piece 22 similar to the first layer, and then the fourth layer is formed by punching and stacking the single core piece 22 similar to the second layer. To do. By repeating this punching and lamination, as shown in FIG. 2C, a laminated core 24 having a predetermined number n is manufactured.
[0023]
The laminated iron core 24 is integrated by joining the layers by joining means such as welding or adhesion at the center of the outer periphery of each of the divided teeth 24a indicated by the arrows in FIG.
[0024]
FIG. 3 is a perspective view showing a laminated core produced by the manufacturing apparatus of this embodiment, where (a) shows a state when completed, and this completed laminated core is as shown in (b). The adjacent divided teeth 24a can be bent at the connecting portion 24b of each divided tooth 24a. As shown in FIG. 3B, the adjacent divided teeth 24a are bent at the connecting portion 24b, and the space between the winding portions 24c of the divided teeth 24a is widened, so that the winding property is improved and the winding is performed at a high density. It can be performed.
[0025]
FIG. 4 is a plan view showing a state of the winding process. As shown in FIG. 4A, the completed laminated core 24 is held by a jig 9 in which holding portions 9a sandwiching each divided tooth 2a are connected by a hinge-like portion 9b, and the insulating material 10 is attached to the winding portion 24c. Then, as shown in FIG. 4 (b), the holding portion 9 a is bent by the hinge-shaped portion 9 b and winding is performed by the winding machine 11. The interlayer can be firmly fixed by the tightening force of the winding in this winding.
[0026]
In this embodiment, since punching is performed in units of 22 single core pieces, the press load is small, and a compact and inexpensive press machine and die can be used.
[0027]
In addition, since the single core pieces 22 between the layers are stacked so as to overlap with each other in the convex portion 22b, the magnetic characteristics are good, and the direction of the convex portion 22b is reversed between the layers. A fitting portion of the convex portion 22b and the concave portion 22a is sandwiched between the single core pieces 22 in the laminating direction, and a laminated iron core having excellent mechanical strength (rigidity) is obtained.
[0028]
Embodiment 2. FIG.
FIG. 5 is a plan view (a) and a side view (b) showing the configuration of the second embodiment in the laminated core manufacturing apparatus according to the present invention, where the same reference numerals as those in the first embodiment denote the same or corresponding parts. Indicates.
[0029]
This embodiment is different from the first embodiment in the configuration of the mold 1, and the configurations of the feeding device 3 and the laminating device 4 are the same as those in the first embodiment.
[0030]
As shown in FIG. 5 (a), the mold 1 includes a single core piece 22 having a concave shape at one end of the single core piece 22 and a convex shape at the other end. The first punching portion 12 punched to be connected to the first steel punching portion 12 and the first punching portion 12 are connected to the magnetic steel sheet 2 by the micro-connecting portion 14 with a single core piece 22 having a concave shape and a convex shape formed at opposite ends. The second punching portion 13 for punching in this way, the die punch mechanism 15 for cutting the minute coupling portion, and the knockout mechanism 16 provided along with the die punch mechanism 15 are provided.
[0031]
One of the first punching portion 12 and the second punching portion 13 can be selectively operated by a driving device such as a cylinder.
[0032]
Further, when the micro-connecting portion 14 is cut by the die punch mechanism 15 on the laminating device 4, the punched single core piece 22 is simultaneously pushed out to the laminating portion of the laminating device 4 by the knockout mechanism 1.
[0033]
When the punching cycle of the single core piece 22 becomes high speed, the thickness of the die becomes an obstacle, and it is difficult to transport the punched single core piece 22 to the stacking portion of the stacking apparatus 4 provided at the lower part of the die. However, in this embodiment, since only the micro-connecting portion 14 is punched on the laminating apparatus 4, the thickness A of the die can be reduced, and even if the punching cycle becomes high, punching can be performed stably. The single core piece 22 can be transported at high speed to the stacking portion of the stacking apparatus 4 provided at the lower part of the die.
[0034]
Assembling of the laminated iron core is performed in the same manner as in the first embodiment. First, after being punched by the first punching portion 12, when the micro-connecting portion 14 is cut by the die punch mechanism 15, the punched single core piece 22 is simultaneously pushed out to the laminating device 4 by the knockout mechanism 1.
[0035]
In the laminating apparatus 4, the single core piece 22 to be punched next is rotated to a position where the convex shape portion 2b and the concave shape portion 2a of the adjacent single core pieces 22 fit in the laminating apparatus 4, and the next single core piece 22 are sequentially punched and inserted to form the first layer.
[0036]
Next, the single core piece 22 is punched by the second punching portion 13, the micro-connecting portion 14 is cut by the die punch mechanism 15, pushed out to the stacking device 4 by the knockout mechanism 1, and stacked on the first layer. The single core pieces 22 are sequentially inserted on the first layer so that the convex shape portions 2b and the concave shape portions 2a of the adjacent single core pieces 22 are fitted to form a second layer. At this time, since the directions of the convex shape portion 2b and the concave shape portion 2a are opposite in the first layer and the second layer, the convex shape portion 2b of the first layer and the convex shape portion 2b of the second layer. And the single core piece 22 of the second layer straddles the fitting portion between the convex portion 2b and the concave portion 2a of the first layer.
[0037]
Next, the third layer is formed by punching and stacking the single core piece 22 similar to the first layer, and then the fourth layer is formed by punching and stacking the single core piece 22 similar to the second layer. To do. By repeating this punching and lamination, a laminated core 24 having a predetermined number of laminations is manufactured.
[0038]
The laminated iron core 24 is integrated by joining the layers by a joining means such as welding or adhesion at the center of the outer periphery of each divided tooth 24a.
[0039]
In this embodiment, since punching is performed in units of 22 single core pieces, the press load is small, and a compact and inexpensive press machine and die can be used.
[0040]
In addition, since the single core pieces 22 between the layers are stacked so as to overlap with each other in the convex portion 22b, the magnetic characteristics are good, and the direction of the convex portion 22b is reversed between the layers. A fitting portion of the convex portion 22b and the concave portion 22a is sandwiched between the single core pieces 22 in the laminating direction, and a laminated iron core having excellent mechanical strength (rigidity) is obtained.
[0041]
Embodiment 3 FIG.
FIG. 6 is a plan view (a) and a side view (b) showing the configuration of the third embodiment of the laminated core manufacturing apparatus according to the present invention, where the same reference numerals as those in the first embodiment denote the same or corresponding parts. Indicates.
[0042]
In this embodiment, as shown in FIG. 6, a laminated base 17 is provided in the laminated portion 8a, and the laminated base 17 is driven up and down by a motor 17a or the like.
[0043]
The laminated base 17 is lowered by the plate pressure of the single core piece 22 every time one layer is laminated so that the distance between the die lower part of the die punch mechanism 15 and the upper surface of the single laminated core piece 22 is a constant distance C. Is programmed to do so.
[0044]
When the number of stacked layers is large, since the stacked portion 8a is deep in the initial stage of stacking, there is a problem that the punched single core piece 22 is tilted or cannot be stacked at the correct position, but in this embodiment, By moving the laminated base 17 up and down, the distance between the lower part of the die and the upper surface of the laminated single core pieces 22 can always be kept at a distance C, so that the punched single core pieces 22 can be stably laminated. .
[0045]
Embodiment 4 FIG.
FIG. 7 is a plan view (a) and a side view (b) showing the configuration of the fourth embodiment of the laminated core manufacturing apparatus according to the present invention. Indicates.
[0046]
In this embodiment, as shown in FIG. 7, the laminating apparatus 18 moves linearly, and the single core pieces 22 punched out by the mold 1 are laminated in a linearly arranged state. A laminated iron core is obtained.
[0047]
In this embodiment, since a linear laminated iron core is obtained, it is possible to perform winding by the winding machine 19 in a straight state as shown in FIG. Time can be shortened.
[0048]
Embodiment 5 FIG.
FIG. 9 is a plan view showing the configuration of the fifth embodiment of the laminated core manufacturing apparatus according to the present invention. The same reference numerals as those in the first embodiment denote the same or corresponding parts.
[0049]
In this embodiment, as shown in FIG. 9, the tooth portion 22c around which the coil of the single core piece 22 is wound is inserted into the laminating apparatus 4 so as to protrude to the outer peripheral side, and the laminating process is performed, so that The coil is wound in the laminated state.
[0050]
In this embodiment, since the space around the tooth portion 22c around which the coil is wound is large, there is no obstacle in the winding, and the winding can be performed at high speed with little damage to the winding.
[0051]
Embodiment 6 FIG.
FIG. 10 is a plan view (a) and a side view (b) showing the configuration of the sixth embodiment of the laminated core manufacturing apparatus according to the present invention. The same reference numerals as those in the first embodiment denote the same or corresponding parts. Indicates.
[0052]
In this embodiment, as shown in FIG. 10, the convex portion of the single core piece 22 punched out by the first punched portion 12 or the second punched portion 13 so as to hold the two magnetic steel plates together by the minute connecting portion 14. In 22b, a die punch 20 is used to form a fitting portion 22d having a concave on the front side and a convex on the back side, and then the fine connecting portion 14 is cut and the single core piece 22 is inserted into the laminating apparatus 4.
[0053]
According to this embodiment, the stacked single core pieces 22 are fixed at the upper and lower positions by the fitting portion 22d, so that there is little displacement between the stacked layers, and can be stacked with high accuracy.
[0054]
Moreover, as shown in FIG. 11, the single core pieces 22 between the upper and lower sides can be fixed by reducing and caulking the unevenness in the fitting portion 22d.
[0055]
Embodiment 7 FIG.
FIG. 12 is a plan view showing the configuration of the seventh embodiment of the laminated core manufacturing apparatus according to the present invention, and FIG. 13 is a plan view showing a state in which the single core pieces are laminated by the lamination apparatus. The same reference numerals as 1 indicate the same or corresponding parts.
[0056]
In this embodiment, in the laminating apparatus 18 in the laminated core manufacturing apparatus shown in FIG. 12, as shown in FIG. 13, the lower layer and the upper convex portion 22b are slightly overlapped with each other (b). The layers are stacked in a state (a) where a gap 22c is formed between the convex portion 22b and the concave portion 22a.
[0057]
FIG. 14 is a plan view showing a process of assembling the laminated iron cores into the stator. As shown in the figure, the laminated iron core 24 is sandwiched by a jig (not shown) (a), and then the winding machine 19 winds the divided teeth 24a (b). A coil 24e is attached to 24a (c).
[0058]
Next, an adhesive is applied to the gap 22c of the connecting portion by the dispenser 21 (d). For the adhesive, for example, a low-viscosity thermosetting adhesive is used.
[0059]
Next, the laminated iron core 24 equipped with the coil is rounded into a cylindrical shape to form a stator. In this state, the laminated iron core 24 is placed in a heating furnace, and the adhesive is cured to complete the stator (c).
[0060]
According to this embodiment, the adhesive penetrates between the overlapping portions of the convex portions 22b between the layers and permeates between the single core pieces in a wide range, and the single core pieces in the same layer and the single core pieces between the layers are firmly fixed. Therefore, the rigidity as a stator is increased, and a rotating machine with less vibration is obtained.
[0061]
【The invention's effect】
According to the method for manufacturing a laminated iron core according to the present invention, a divided tooth obtained by punching an electromagnetic steel sheet to form a single core piece having a core back and a winding portion protruding from the core back, and laminating the single core pieces. In the manufacturing method of the laminated iron core that joins the divided teeth,
A first core piece having a convex portion formed at one end of the core back and a concave portion formed at the other end is punched out, and the convex portion and the concave portion of the first core piece are opposed to each other. Forming the first layer by arranging the first core pieces;
A second core piece having a convex portion and a concave portion formed on the core back in a direction opposite to the first core piece is punched, and the convex portion and the concave portion of the second core piece are formed. A second layer is formed by arranging the second core pieces to face each other, and the convex shape portion of the second core piece is overlapped with the convex shape portion of the first core piece to Laminating a second layer on the first layer;
A step of stacking the first layer on the second layer by superimposing the convex portion of the first core piece on the convex portion of the second core piece;
Since the step of laminating the second layer on the first layer and the step of laminating the first layer on the second layer are sequentially repeated and a predetermined number of layers are laminated, a small size and a low cost are obtained. A press machine and a mold can be used, and a laminated iron core having good magnetic properties and excellent mechanical strength (rigidity) can be obtained.
[0062]
According to the laminated iron core manufacturing apparatus of the present invention, a divided tooth obtained by punching out an electromagnetic steel sheet to form a single core piece having a core back and a winding portion protruding from the core back, and laminating the single core pieces. In the manufacturing apparatus of the laminated iron core that joins the divided teeth,
The first core piece in which the convex portion is formed at one end of the core back and the concave portion is formed at the other end, and the convex portion and the concave portion are opposite to the first core piece. A mold for selectively punching the second core piece formed on the back;
A feeding device for conveying the electromagnetic steel sheet into a mold;
It has a laminated part which receives the 1st core piece and the 2nd core piece which were pierce | punched, and makes the said convex shape part and a concave shape part oppose by moving the core piece received in this laminated part sequentially Since the apparatus includes the laminating apparatus for arranging the first core piece and the second core piece, a small and inexpensive press machine and a mold can be used, and the magnetic characteristics are good. In addition, a laminated core excellent in mechanical strength (rigidity) can be obtained.
[Brief description of the drawings]
FIG. 1A is a plan view and FIG. 1B is a side view showing the configuration of a first embodiment of a laminated core manufacturing apparatus according to the present invention.
FIG. 2 is a plan view showing a state in which a laminated core is assembled in the laminating apparatus according to the first embodiment.
3 is a perspective view showing a laminated iron core created by the manufacturing apparatus of Embodiment 1. FIG.
FIG. 4 is a plan view showing a state of a winding process in the first embodiment.
FIGS. 5A and 5B are a plan view and a side view showing the configuration of a second embodiment of the laminated core manufacturing apparatus according to the present invention. FIGS.
FIGS. 6A and 6B are a plan view and a side view showing a configuration of a third embodiment of the laminated core manufacturing apparatus according to the present invention. FIGS.
FIGS. 7A and 7B are a plan view and a side view showing a configuration of a fourth embodiment of the laminated core manufacturing apparatus according to the present invention. FIGS.
FIG. 8 is a plan view showing a winding process in the fourth embodiment.
FIG. 9 is a plan view showing a configuration of a fifth embodiment of the laminated core manufacturing apparatus according to the present invention.
FIGS. 10A and 10B are a plan view and a side view showing a configuration of a sixth embodiment of the laminated core manufacturing apparatus according to the present invention. FIGS.
FIG. 11 is a sectional view showing a fitting state in the sixth embodiment.
FIG. 12 is a plan view showing a configuration of a seventh embodiment of the laminated core manufacturing apparatus according to the present invention.
13 is a plan view showing a state in which single core pieces are laminated by a laminating apparatus in Embodiment 7. FIG.
14 is a plan view showing a process of assembling stacked iron cores into a stator in Embodiment 7. FIG.
[Explanation of symbols]
1 mold, 2 electrical steel sheet, 3 feeding device, 4,18 laminating device,
5, 6 End punched part, 7 Whole punched part, 8 Guide pin,
8a Laminated part, 9 Jig, 9a Holding part, 9b Hinged part, 10 Insulating material,
11, 19 Winding machine, 12 1st punching part, 13 2nd punching part,
14 micro coupling part, 15 die punch mechanism, 16 knockout mechanism,
17 laminated base, 17a motor, 20 die punch,
21 dispenser, 22 single core piece, 22a concave shape part, 22b convex shape part, 22c clearance, 22d fitting part, 22e back core, 22f winding part,
23 step motor, 24 laminated iron core, 24a divided teeth,
24b connecting part, 24c winding part, 24d fitting part, 24e coil.

Claims (13)

A laminated iron core is formed by punching an electromagnetic steel sheet to form a single core piece having a core back and a winding portion protruding from the core back, forming divided teeth in which the single core pieces are laminated, and connecting the divided teeth. In the manufacturing method of
A first core piece having a convex portion formed at one end of the core back and a concave portion formed at the other end is punched, and the convex portion and the concave portion of the first core piece are opposed to each other. Forming the first layer by arranging the first core pieces;
A second core piece having a convex portion and a concave portion formed on the core back in a direction opposite to the first core piece is punched, and the convex portion and the concave portion of the second core piece are formed. A second layer is formed by arranging the second core pieces to face each other, and the convex shape portion of the second core piece is overlapped with the convex shape portion of the first core piece. Laminating a second layer on the first layer;
A step of stacking the first layer on the second layer by overlapping the convex portion of the first core piece with the convex portion of the second core piece;
Producing a laminated iron core comprising a step of laminating the second layer on the first layer and a step of laminating the first layer on the second layer to sequentially laminate a predetermined number of layers. Method. The first core piece and the second core piece are formed by punching the first core piece and the second core piece so as to be fastened to the electromagnetic steel plate by the fine connection portion, and then cutting the fine connection portion. The method for manufacturing a laminated core according to claim 1, wherein 2. The method of manufacturing a laminated core according to claim 1, wherein the arrangement of the first core pieces and the second core pieces is linear. 2. The method of manufacturing a laminated core according to claim 1, wherein the first core piece and the second core piece are arranged in an annular shape by projecting the winding portion toward the outer peripheral side. When the first core piece and the second core piece are punched out, or before and after the punching, a concavo-convex protrusion is provided on the core back or winding portion of the first core piece and the second core piece. The method for producing a laminated iron core according to claim 1, wherein: 2. The method of manufacturing a laminated core according to claim 1, wherein the convex portion and the concave portion are opposed to each other with a gap. A laminated iron core is formed by punching an electromagnetic steel sheet to form a single core piece having a core back and a winding portion protruding from the core back, forming divided teeth in which the single core pieces are laminated, and connecting the divided teeth. In the manufacturing equipment of
The first core piece in which the convex part is formed at one end of the core back and the concave part is formed at the other end, and the convex part and the concave part are opposite to the first core piece. A mold for selectively punching the second core piece formed on the back;
A feeding device for conveying the electromagnetic steel sheet into a mold;
It has a lamination part which receives the 1st core piece and the 2nd core piece which were pierce | punched, and makes the said convex shape part and a concave shape part oppose by moving the core piece received in this lamination part one by one An apparatus for manufacturing a laminated iron core, comprising: a laminating apparatus for arranging the first core piece and the second core piece. The mold punches the whole of the core piece including the protruding portion and the end punching portion for selectively punching the concave shape portion of the first core piece and the concave shape portion of the second core piece. The laminated core manufacturing apparatus according to claim 7, further comprising a whole punched portion. The mold includes first and second punched portions for punching the first core piece and the second core piece in a state where the first core piece and the second core piece are fastened to the electromagnetic steel plate by the finely connected portion, and the minutely connected portion of the laminated portion. 8. A laminated core manufacturing apparatus according to claim 7, further comprising: a die punch mechanism for cutting at an upper portion; and a knockout mechanism which is provided together with the die punch mechanism and pushes the core piece from which the minute connecting portion is cut into the laminated portion. . 8. The laminated core manufacturing apparatus according to claim 7, wherein a laminated base on which the first core piece and the second core piece are placed is provided in the laminated portion, and the laminated base can be moved up and down. . 8. The laminated core manufacturing apparatus according to claim 7, wherein the laminating apparatus moves the core piece received by the laminating portion in a straight line. 8. The laminated core manufacturing apparatus according to claim 7, wherein the laminating apparatus moves the core piece received by the laminating portion in an annular shape. 8. The apparatus for manufacturing a laminated core according to claim 7, further comprising a die punch for forming a protrusion having a recess in the core back or the winding portion.

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