JP5438441B2 - Manufacturing method of laminated iron core and laminated iron core produced using the same - Google Patents

Description

The present invention relates to a method for manufacturing a laminated core in which a plurality of arc-shaped segment core pieces are laminated in an annular shape, and a laminated core produced using the same.

When manufacturing a laminated core obtained by punching a plurality of arc-shaped segment core pieces from a strip and laminating them in an annular shape, as shown in FIG. The process is distributed in the feed direction of the strip 91 for each configuration shape of the segment core piece 90 (for example, each portion arranged in the segment core piece such as a slot, a caulking portion, and an outer peripheral portion). Then, while feeding the strip 91 at a predetermined pitch, a plurality of segment core pieces 90 are formed by sequentially performing punching with the progressive die 92 in each step (for example, step 1 to step 6) (for example, Patent Document 1). Steps 1 to 6 in FIG. 6 show pilot hole punching, slot punching, bent portion punching, caulking portion formation, inner shape portion punching, and outer shape portion punching, respectively.

JP 2004-289908 A

However, in the method using the progressive die 92, the size of the die is increased depending on the number of steps required for punching and the width of the segment core piece 90 to be formed. For this reason, the press machine in which the progressive die 92 is mounted is also enlarged, and the equipment cost of the progressive die 92 and the press machine is high.
In view of this, it is conceivable to divide all the punching steps and reduce the number of steps allocated to one die, thereby reducing the size of the die and the press machine on which the die is mounted. Specifically, as shown in FIG. 6B, the punching steps 1 to 6 are divided into three steps of steps 1 and 2, steps 3, 4 and steps 5 and 6, and these steps are divided. Further, punching of a small number of steps is performed with the dies 93 to 95, respectively.

In this case, as compared with the method using the progressive die 92, the mold and the press machine can be made smaller, but the number of the molds and the press machine is increased by the amount corresponding to the division of the punching process. It will take. Further, it is necessary to lengthen the length of the punching line so that the molds and press machines adjacent to each other in the feeding direction of the strips 91 do not come into contact with each other.
Here, in order to shorten the length of the punching line, there is a method in which each die 93 to 95 is transferred to one press machine and punched to the final shape. However, replacement work such as die replacement is frequently performed. Since this occurs, it takes time and workability and productivity are significantly reduced.

The present invention has been made in view of such circumstances, and provides a method for manufacturing a laminated core capable of reducing the cost required for a manufacturing apparatus and improving workability and productivity, and a laminated core manufactured using the method. Objective.

A method for manufacturing a laminated core according to the first invention that meets the above-described object is a method for producing a laminated core in which a plurality of arc-shaped segment core pieces are punched from a strip material, and the segment core pieces are laminated in an annular shape.
An outer contour portion forming a part of the outer peripheral contour of the yoke piece portion of the segment core piece , the inner peripheral contour of the yoke piece portion, and the magnetic pole piece are formed in the punching region of the strip material from which one of the segment core pieces is punched. first hit Nuku portion having an inner contour which forms a portion of the contour parts are, there exist a plurality over the circumferential direction of the segment core pieces, the punched and the outer contour and the inner contour at the same time 1 The mold is sequentially moved in the circumferential direction of the segment core piece to punch out the outer peripheral contour of the yoke piece portion, the inner peripheral contour of the yoke piece portion, and the contour of the magnetic pole piece portion of the one segment . step and located between the segment core pieces adjacent in the feed direction of the elongated member, the second hit Nuku portion having a lateral contour which forms the segment core pieces, the portion Nuku out the second Correspondingly And a second step of forming a punching the segment core pieces in the second mold shape.

In the method for manufacturing a laminated core according to the first aspect, the second mold used in the second step includes a third mold that forms a side shape of the segment core piece, and the segment core piece. It may be divided into a fourth mold that forms the outer peripheral end portion shape.

In the method for manufacturing a laminated core according to the first invention, it is preferable that the punching by the first die in the first step is performed while overlapping circumferential ends of the punching positions.

In the method for manufacturing a laminated core according to the first invention, the punching by the first mold in the first step is performed such that adjacent punching positions have a gap in the circumferential direction, and the first Before or after one step, it is preferable to perform a preliminary step of forming an opening that continues the adjacent punching positions.

Laminated core according to the second invention along the object is achieved with a laminated core manufactured by the method of manufacturing a laminated core according to the first invention, the front end portion of the outer peripheral portion and the pole piece of the yoke piece Is provided with a concave or convex portion formed by the opening.

Preparation and laminated core manufactured by using the same laminated core according to the present invention, the shape of the first step, the first hit Nuku portions plurality of over the circumferential direction of the segment core pieces, corresponding thereto Since the first die is repeatedly punched in the circumferential direction of the segment core pieces, the portion to be punched at a time can be reduced. Further, part in the second step, a second hit Nuku portion located between the segment core pieces adjacent in the feed direction of the strip material, since this punched in a second mold having a shape corresponding, punching at a time Can be reduced.
Accordingly, it is possible to reduce the size of the die and the press machine for attaching the die, and further, since a high thrust is not required for the press, it is possible to reduce the cost of the laminated iron core manufacturing apparatus.
The first strike Nuku part because it has an outer contour and an inner contour which forms a segment core pieces can be carried out and forming a step and an outer contour which forms the inner contour of the segment core pieces simultaneously, The number of processes until product manufacture can be reduced, and productivity can be improved.
In addition, since the length of the punching line can be shortened by downsizing the mold and the press machine to which the mold is attached, it is not necessary to replace the mold with the press machine, and workability and productivity can be improved. In addition, when performing the replacement | exchange of the metal mold | die to a press machine, replacement work can be made easy by size reduction of a metal mold | die.

Moreover, the 2nd metal mold | die used at a 2nd process is made into the 3rd metal mold | die which forms the side part shape of a segment core piece, and the 4th metal mold | die which forms the outer periphery edge part shape of a segment core piece. In the case of division, by providing a gap between the third mold and the fourth mold, it is possible to form a continuous segment core piece connected to the circumferential side end, and the third mold and the fourth mold. Since the divided segment core pieces can be formed by abutting the molds, the segment core pieces can be manufactured according to the application.

And when it carries out while making the circumferential direction edge part of the punching position by a 1st metal mold | die overlap, a punching residue can be eliminated reliably.
Further, when the punching with the first mold is performed so that the adjacent punching positions have a gap in the circumferential direction, and an opening is formed to connect the adjacent punching positions, the remaining punching is surely eliminated. Can do.
Further, there is no problem such as burrs and sagging that occur when they are duplicated, and the product accuracy is improved.

It is explanatory drawing of the manufacturing method of the laminated core which concerns on one embodiment of this invention. (A)-(C) is explanatory drawing of the 1st process of the manufacturing method of the same laminated iron core, respectively. (A)-(C) are explanatory drawings of the preliminary | backup process of the manufacturing method of the laminated core which concerns on a 1st modification, respectively. (A)-(C) are explanatory drawings of the 1st process of the manufacturing method of the laminated core which concerns on the said 1st modification, respectively. (A), (B) is a top view of the segment core piece manufactured at the 2nd process of the manufacturing method of the laminated core which concerns on a 2nd, 3rd modification, respectively. (A), (B) is explanatory drawing of the manufacturing method of the laminated core which concerns on a prior art example, respectively.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, the laminated core manufactured using the manufacturing method of the laminated core which concerns on one embodiment of this invention is demonstrated.
The laminated iron core is a stator laminated iron core (stator), and, as shown in FIG. The segment core pieces 11 are punched out, and the segment core pieces 11 are laminated in a ring shape. Here, any one of caulking, welding, and adhesion can be applied to the method of laminating the plurality of segment core pieces 11, or any two or more can be used in combination.

Each of the segment core pieces 11 has an arc-shaped yoke piece portion 12 and a plurality of magnetic pole piece portions 13 formed inside thereof, and a plurality of slots 14 are provided between the magnetic pole piece portions 13. Yes.
In forming the segment core piece 11, a pilot hole forming die 15, a circumferential contour forming die (an example of a first die) 16, a caulking portion forming die 17, and a side contour forming. A working mold (an example of a second mold) 18 is used.
Further, between the adjacent segment core pieces 11, there is provided a connecting portion 19 that couples the segment core pieces 11 in the outer peripheral region, but without connecting a plurality of segment core pieces 11 at the connecting portion 19, You may isolate | separate every one.

Then, the manufacturing method of the laminated iron core which concerns on one embodiment of this invention is demonstrated, referring FIG.
First, a preparation process for forming the pilot hole 20 will be described.
The pilot holes 20 are formed at a predetermined pitch in the feeding direction on both sides in the width direction of the electromagnetic steel sheet 10 using the pilot hole forming mold 15 while conveying the electromagnetic steel sheet 10. The hatched portion in FIG. 1 indicates the formation position of the pilot hole 20 by the pilot hole forming mold 15.
The pilot hole forming mold 15 is formed to form a pair of two pilot holes 20 disposed on both sides of the electromagnetic steel sheet 10 in the width direction. Thus, the pilot hole forming mold 15 can be reduced in size because the width in the feeding direction of the electromagnetic steel sheet 10 only needs to be wide enough to form one pilot hole 20.

Next, a description will be given of a first step of performing slot extraction, inner shape extraction, and outer shape extraction using the circumferential contour forming die 16.
In the punching region 21 of the electromagnetic steel sheet 10 in which one segment iron core piece 11 is punched (the area surrounded by the pilot holes 20 adjacent to each other in the feeding direction of the electromagnetic steel sheet 10), punching is performed to form the segment iron core piece 11. A plurality of first punched piece portions (first punched portions) 24 having the same shape having the outer contour portion 22 and the inner contour portion 23 are provided in the circumferential direction of the segment core piece 11 as viewed from the stator laminated core to be manufactured. There are five (here). The outer contour portion 22 is an elongated shape and is a part for forming the outer peripheral contour of the yoke piece portion 12 of the segment core piece 11 to be formed. Moreover, the inner side outline part 23 is a part for forming the inner peripheral outline of the yoke piece part 12 of the segment core piece 11 to form, and the outline of the magnetic pole piece part 13 by reverse T shape.

For this reason, a die having a shape corresponding to the first punched piece portion, that is, a circumferential contour forming die 16 is used, and the electromagnetic steel sheet 10 is repeated a plurality of times (here, in the circumferential direction of the segment core piece 11). 5 times) The hatched portion in FIG. 1 indicates the position of the first punched piece portion 24 that is first punched by the circumferential contour forming die 16.
The first punching piece 24 means a portion punched by the circumferential contour forming die 16 and therefore does not exist in the electromagnetic steel sheet 10 after punching with the circumferential contour forming die 16. For convenience, it is indicated by a two-dot chain line as necessary (hereinafter the same).

When punching, it is necessary to move the circumferential contour forming mold 16 in the circumferential direction of the segment core piece 11. As this method, the circumferential contour forming die 16 may be rotated at predetermined angles around the center of curvature of the segment core piece 11, for example, a method described in Japanese Patent Application Laid-Open No. 2007-89326. Etc. can be used.
Here, for punching, a circumferential contour forming die 16 in which one slot 14 is formed by one punching is used, but depending on the size of the segment core piece 11 to be formed, etc., the punching is performed once. A circumferential contour forming mold that can form a plurality of (two or three) slots may be used. In this case, according to the circumferential punching width of the inner contour portion, the circumferential punching width of the outer contour portion is also adjusted.

The punching with the circumferential contour forming die 16 may be performed so that the circumferential end of the punching position is in contact, but as shown in FIGS. It is preferable to carry out while overlapping the direction end portions. 2A to 2C indicate the position of the first punched piece portion 24 punched by the circumferential contour forming die 16. This will be described in detail below.
First, as shown in FIG. 2 (A), the first punching piece 24 is punched by the circumferential contour forming die 16. Then, as shown in FIG. 1, the circumferential direction contour forming die 16 is moved by a predetermined angle in the circumferential direction of the segment core piece 11 to be formed, and then the first punched piece portion 24 is punched again.
At this time, as shown in FIG. 2B, an overlap region 25 is formed at the end of the outer contour portion 22 of the adjacent first punched piece portion 24, and the end portion of the inner contour portion 23 is punched. The punching is performed so that the overlapping regions 26 are respectively formed. In addition, the overlap width of the circumferential direction of each overlap area | region 25 and 26 is about 0.5-3 mm according to the magnitude | size of the segment core piece to form, for example.

Then, in the same manner as the above method, as shown in FIG. 2C, the overlapping region 25 is formed at the end of the punching position of the outer contour portion 22 of the adjacent first punching piece portion 24 and the inner contour portion. Punching is performed so that overlapping regions 26 are formed at the end portions of the punching positions 23, respectively.
Thus, by repeating the above method (here, 5 times), the outer peripheral contour of the yoke piece portion 12 of the segment core piece 11 to be formed, the inner peripheral contour of the yoke piece portion 12, and the contour of the magnetic pole piece portion 13 are formed. Can be formed respectively.
The punching by the circumferential contour forming die 16 is sequentially performed from the end, but is not limited thereto, and may be performed from the central portion in the circumferential direction (hereinafter the same). .
The punching by the circumferential contour forming die 16 may be performed such that the adjacent punching positions have a gap in the circumferential direction. In this case, the first punching shown in FIGS. Prior to performing the process, as shown in FIGS. 3A to 3C, a preliminary process for forming openings 27 and 28 that make adjacent punching positions continuous is performed. 4A to 4C indicate the position of the first punched piece 24 that is punched by the circumferential contour forming die 16. This will be described in detail below.

First, the preliminary process will be described.
As shown in FIG. 3A, the opening 27 is formed in the outer peripheral contour portion of the yoke piece 12 of the segment core piece 11 to be formed with one opening forming mold (not shown). Openings 28 are respectively formed in the tip contour portions.
Then, the openings 27 and 28 are formed at a predetermined pitch as shown in FIGS. 3B and 3C while shifting the opening forming mold in the circumferential direction of the segment core piece 11 to be formed.
Thus, after forming the opening parts 27 and 28, a 1st process is performed.
First, as shown in FIG. 4A, the first punching piece 24 is punched out by the circumferential contour forming die 16. At this time, an overlap region 29 is formed at the circumferential end of the outer contour 22 of the first punching piece 24 and the opening 27, and an end of the punching position of the inner contour 23 (of the radially inner portion). Punching is performed so that the overlapping regions 30 are formed in the circumferential end) and the opening 28, respectively.

Then, the circumferential contour forming mold 16 is sequentially shifted in the circumferential direction of the segment core piece 11 to be formed, and as shown in FIGS. 4B and 4C, the outer contour portion of the first punched piece portion 24. The overlapping regions 31 and 29 are formed at both ends of the punching position 22 and the openings 27, and the overlapping regions 32 and 30 are formed at both ends of the punching position of the inner contour portion 23 and the openings 28, respectively. Perform punching. In addition, the overlap width of the circumferential direction of each overlap area | region 29-32 is each about 0.5-3 mm according to the magnitude | size of the segment core piece to form, for example.
Thus, by repeating the above method, the outer peripheral contour of the yoke piece portion 12 of the segment core piece 11 to be formed, the inner peripheral contour of the yoke piece portion 12, and the contour of the magnetic pole piece portion 13 can be formed.
The preliminary step described above may be performed after the first step. This is because the shape of the segment core pieces formed is the same even if the outer contour portion and the inner contour portion are punched first and then the opening is punched.

The inner width in the radial direction of each of the openings 27 and 28 is such that the outer contour 22 and the inner contour 23 are punched at the end of the punching position and the openings 27 and 28 are formed with overlapping regions. The width may be smaller or larger than the radial width of the portion 22 and the inner contour portion 23.
However, in order to more reliably form the overlapping region, it is preferable that the inner width in the radial direction of the opening is larger than the radial width of the outer contour portion and the inner contour portion.
In this case, as shown to FIG. 5 (A), a part of opening part is formed in the segment core piece 32a to form. As a result, recesses 32b and 32c are formed by forming openings at the outer periphery of the yoke piece of each segment core piece 32a and at the tip of the magnetic pole piece, so the segment core pieces 32a are laminated. When a laminated iron core is manufactured, notches are provided in the circumferential direction of the outer peripheral portion and the inner peripheral portion over the lamination direction of the laminated core. When the radial inner width of the opening is smaller than the radial width of the outer contour portion and the inner contour portion, the convex portions 32d and 32e shown in FIG. Each is formed. The convex portions 32d and 32e are removed as necessary.

Next, a caulking portion forming process for forming the caulking portion using the caulking portion forming mold 17 will be described with reference to FIG.
The caulking portion forming mold 17 is formed as a pair of two caulking portions 33 disposed in proximity to the segment core pieces 11 adjacent to each other in the feeding direction of the electromagnetic steel sheet 10. The hatched portion in FIG. 1 indicates the position where the caulking portion 33 is formed by the caulking portion forming mold 17.
Since one caulking portion 33 formed on one segment core piece 11 is formed on each side in the circumferential direction of the segment core piece 11, one side of the adjacent segment core pieces 11 is larger than the distance between the caulking portions 33. The distance between the caulking portions 33 arranged on the other side is shorter.
For this reason, the size of the caulking portion forming mold 17 can be reduced.
This caulking portion forming step may be included in the first step without being provided separately from the first step. At this time, the caulking portion may be formed by a circumferential contour forming mold, and a mold for forming the caulking portion is provided separately from the circumferential contour forming die. May be rotated one by one.

Then, a second step of forming the side contour using the side contour forming mold 18 will be described with reference to FIG.
Between the segment core pieces 11 adjacent to each other in the feeding direction of the electromagnetic steel sheet 10, there is a second punched piece portion (second punched portion) 34 having a side contour portion that forms the segment core piece 11. The second punched piece portion 34 is an outer piece that forms the outer peripheral end contour (outer peripheral end shape) of each segment core piece 11 continuously with the punched position of the outer contour portion 22 of the adjacent segment core pieces 11. And the inner piece portion 36 that forms the side contour (side shape) of each segment core piece 11 continuously with the punching position of the inner contour portion 23 of the adjacent segment core piece 11. . A connecting portion 19 is formed between the outer piece portion 35 and the inner piece portion 36.

For this reason, a die having a shape corresponding to the second punched piece 34, that is, the side contour forming die 18 is used, and the second punched piece 34 is punched to form the segment core piece 11. The hatched portion in FIG. 1 indicates the position of the second punched piece 34 that is punched by the side contour forming die 18.
Here, the side contour forming mold 18 includes a fourth mold having a shape corresponding to the outer piece portion 35 and a third mold having a shape corresponding to the inner piece portion 36. Since a gap is provided between the third mold and the fourth mold, the connecting portion 19 is formed.
In addition, when separating each segment core piece piece by piece, the third die and the fourth die may be brought into contact with each other to eliminate the gap, but the side contour forming die may be The three molds and the fourth mold may be integrated without being separated.

A plurality of continuous segment core pieces 11 formed in this manner are spirally wound and laminated while being bent at the connecting portion 19 to produce a laminated core. At this time, it is preferable that the inner side of the segment core piece 11 is wound around a cylindrical body having a predetermined diameter and is wound spirally.
In addition, when the segment core piece separated for every sheet is formed by punching, the segment core pieces are laminated in a ring shape to produce a laminated core.
From the above, by using the method for manufacturing a laminated core of the present invention, the cost for the manufacturing apparatus can be reduced, and workability and productivity can be improved.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where a laminated core manufactured by using a method of manufacturing a laminated core according to the present invention by combining a part or all of the above-described embodiments and modifications and a laminated core manufactured using the method are included in the scope of the present invention. .
Moreover, in the said embodiment, although the case where the lamination | stacking iron core was a stator lamination | stacking iron core was demonstrated, naturally a rotor lamination | stacking iron core (it is also called a rotor) is applicable.
And in the said embodiment, although the case where the preliminary | backup process which forms an opening part was performed before the 1st process was demonstrated, after a 1st process (between a 1st process and a caulking part formation process, Alternatively, it may be performed between the caulking portion forming step and the second step).

10: electromagnetic steel plate (strip), 11: segment core piece, 12: yoke piece, 13: magnetic pole piece, 14: slot, 15: pilot hole forming mold, 16: circumferential contour forming mold ( (First mold), 17: caulking part forming mold, 18: side contour forming mold (second mold), 19: connecting part, 20: pilot hole, 21: punching area, 22: Outer contour portion, 23: Inner contour portion, 24: First punched piece portion, 25, 26: Overlapping region, 27, 28: Opening portion, 29-32: Overlapping region, 32a: Segment core piece, 32b, 32c: Concave part, 32d, 32e: convex part, 33: caulking part, 34: second punched piece part, 35: outer piece part, 36: inner piece part

Claims (5)

In a manufacturing method of a laminated core in which a plurality of arc-shaped segment core pieces are punched from a strip, and the segment core pieces are laminated in an annular shape,
An outer contour portion forming a part of the outer peripheral contour of the yoke piece portion of the segment core piece , the inner peripheral contour of the yoke piece portion, and the magnetic pole piece are formed in the punching region of the strip material from which one of the segment core pieces is punched. first hit Nuku portion having an inner contour which forms a portion of the contour parts are, there exist a plurality over the circumferential direction of the segment core pieces, the punched and the outer contour and the inner contour at the same time 1 The mold is sequentially moved in the circumferential direction of the segment core piece to punch out the outer peripheral contour of the yoke piece portion, the inner peripheral contour of the yoke piece portion, and the contour of the magnetic pole piece portion of the one segment . step and located between the segment core pieces adjacent in the feed direction of the elongated member, the second hit Nuku portion having a lateral contour which forms the segment core pieces, the portion Nuku out the second Correspondingly Method for manufacturing a laminated core and a second step of forming a punching the segment core pieces in the second mold shape. 2. The method for manufacturing a laminated core according to claim 1, wherein the second mold used in the second step includes a third mold that forms a side shape of the segment core piece, and the segment core piece. A method of manufacturing a laminated core, wherein the laminated core is divided into a fourth mold that forms an outer peripheral end shape. 3. The method of manufacturing a laminated core according to claim 1, wherein the punching by the first mold in the first step is performed while overlapping circumferential end portions of the punching positions. Manufacturing method. 3. The method of manufacturing a laminated core according to claim 1, wherein the punching by the first mold in the first step is performed such that adjacent punching positions have a gap in the circumferential direction, and Before or after the first step, a preparatory step for forming an opening for continuing the adjacent punching positions is performed. A laminated core manufactured by the method for manufacturing a laminated core according to claim 4, wherein the tip portion of the outer peripheral portion and the pole piece of the yoke piece is concave or convex portion formed by the openings provided A laminated iron core characterized by being made.

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