JP2013005628A - Method for manufacturing laminated core, and laminated core manufactured by this method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminated core, which does not form a lap part caused by a cut connection part, and furthermore, in which the cut connection parts do not even compete with each other, and to provide the laminated core manufactured by this method.SOLUTION: The method for manufacturing the laminated core includes: separating one roll of a long core piece 14 from a linear belt-like core piece formed of segment core pieces 12 having one or a plurality of magnetic pole pieces 16 connected at a connection part 13 by cutting apart at the connection part 13; producing an annular core piece 15 by annularly winding the long core piece 14; and sequentially laminating the annular core pieces 15. The method for manufacturing the laminated core also includes separating the connection part 13 by removing a separation piece 13a having a predetermined width, and preventing a lap from being formed at the connection part 13 remained by removing the separation piece 13a from a connection part 1 when forming the annular core piece 15 from the long core piece 14.

Description

The present invention relates to a laminated core obtained by cutting a linear strip-shaped core piece including segment iron pieces having one or a plurality of magnetic pole pieces at a connecting portion to form an annular core piece and laminating the annular core pieces. The present invention relates to a manufacturing method and a laminated iron core manufactured by this method.

Patent Document 1 discloses a technique for manufacturing a laminated core by bending a long core piece having a plurality of magnetic pole pieces at a connecting portion to form an annular core piece, and laminating the annular core pieces. However, in this method of manufacturing a laminated iron core, since a long iron core piece for one roll is taken from one plate material, there is an advantage that both ends can be processed freely, but the material yield is poor and the production speed is slow. There was a problem.

Therefore, as shown in FIG. 5, a strip-shaped core piece is formed by continuously punching and forming a number of segment core pieces connected by a connecting portion from a continuous strip 60 with a die device 61, and this is appropriately used. When a long core piece 63 for one volume is made by separating at a connecting portion at a location, and a predetermined core is manufactured by laminating the annular core piece 64 obtained by winding the long core piece 63 in a ring shape, the whole is laminated. It has been found that the yield of the iron core is improved and the production is performed more efficiently.

JP 7-79551 A

However, as shown in FIGS. 6A and 6C, the strip-shaped core piece 65 is cut at the position of the connecting portion 66, and as shown in FIG. 6B, a concave portion 67 formed on the radially inner side. When the annular core piece 64 is formed by combining the convex portions 68, as shown in FIG. 6D, the end portions of the strip-shaped connecting portions 66 are overlapped to form a wrap portion 69, or the end portions of the connecting portions 66 There was a problem of competing.
Further, when cutting the connecting portion 66 with scissors, the connecting portion 66 has to be cut twice or more in order to prevent the wrap portion 69 from being generated, which is very complicated. Further, if the connecting portion 66 is cut in the mold, the workability is improved. However, the connecting portion 66 is always warped in the cutting direction, and if the annular core pieces 64 are stacked, the upper and lower annular core pieces 64 are scratched. It was.
In FIG. 6, 70 is a caulking portion, and 71 is a punched hole.

The present invention has been made in view of such circumstances, and there is no generation of a lap portion due to a cut connecting portion, and furthermore, a manufacturing method of a laminated iron core in which the cut connecting portions do not compete with each other. It aims at providing the laminated iron core manufactured by this.

The manufacturing method of the laminated core according to the first invention that meets the above-described object is a long core piece for one turn from a linear strip-shaped core piece in which segment iron pieces having one or more magnetic pole pieces are connected by a connecting portion. In the manufacturing method of the laminated core in which the specific core portion is separated and separated, the long core pieces are wound in an annular shape to form an annular core piece, and the annular core pieces are sequentially laminated.
Separation of the connecting portion is performed by removing a separation piece having a constant width, and prevents formation of the remaining connecting portion by removing the separation piece from the connecting portion when forming the annular core piece from the long iron core piece. is doing.

In the method for manufacturing a laminated core according to the first aspect of the present invention, the long core core piece is provided with a concave portion at one end and a convex portion at the other end, and is wound in an annular shape. It is preferable to prevent deviation of the shank core piece in the radial direction.

In the method for manufacturing a laminated core according to the first aspect of the present invention, it is preferable that the connecting portion has a band shape and the separation piece is formed from the center or the end to the center of the connecting portion.
Thereby, since the punching of the connecting portion is performed from the center of the connecting portion or from the end to the center, the connecting portion punching die need not have high accuracy.

In the method for manufacturing a laminated core according to the first invention, the strip-shaped core piece is reel-wound and stored, and when the annular core piece is manufactured, the reel-wrapped strip-shaped core piece is unwound, and the long It is better to be separated into a shank core piece.

And the laminated core which concerns on 2nd invention is the laminated core manufactured by the manufacturing method of the laminated core which concerns on 1st invention, Comprising: Of the said connection part cut | disconnected located in the edge part of the said annular core piece There is a gap between them, and the connecting positions of the laminated annular core pieces (that is, the cut connecting portions) are sequentially shifted in the circumferential direction. This makes it possible to manufacture a strong laminated iron core.

Since the laminated core manufactured by the method for manufacturing a laminated core according to the present invention does not have a wrap portion at the cut connecting portion, a partial thickness deviation does not occur in the laminated core.
Moreover, since the manufacture is also easy, the conventional mold apparatus can be used without major modification.

It is explanatory drawing of the manufacturing method of the laminated core which concerns on the 1st Embodiment of this invention. (A), (B) is detail explanatory drawing of the manufacturing method of the same laminated iron core, respectively. (A), (B) is detail explanatory drawing of another example of the manufacturing method of the same laminated iron core, respectively. It is explanatory drawing of the manufacturing method of the laminated core which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the manufacturing method of the laminated core which concerns on a prior art example. (A)-(D) are explanatory drawings 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.
As shown in FIG. 1, the manufacturing method of the laminated iron core which concerns on the 1st Embodiment of this invention uses the metal mold | die apparatus 11, and connects the segment iron core piece 12 from the thin strip material 10 which consists of a magnetic steel plate. The linear strip-shaped iron core pieces connected at 13 are manufactured. A long core piece 14 of one volume is cut from the strip-shaped core piece at a specific connecting portion 13 to make it. This long iron core piece 14 is conveyed to another position, the long iron core piece 14 is wound in an annular shape to form an annular iron core piece 15, and the annular iron core pieces 15 are sequentially stacked via caulking portions.

The segment core piece 12 has one or a plurality (2 in this embodiment) of magnetic pole piece portions 16, and each long core piece 14 has one segment of the core piece 12. When the annular core pieces 15 are stacked, the positions of the cut connecting portions 13 are sequentially shifted in the circumferential direction so that the positions of the cut connecting portions 13 of the upper and lower annular core pieces 15 do not overlap.

As shown in FIG. 2, a concave portion 18 and a convex portion 19 are formed in the radially inner position from the connecting portion 13 at the end portion of the adjacent segment core pieces 12, and the positions of the adjacent segment core pieces 12 in the radial direction are formed. Prevents deviation.
The apparatus for producing the long iron core piece 14 from the strip-shaped iron core piece includes a connecting portion punching die 20 provided on the downstream side of the die device 11. The connecting portion punching die 20 is composed of an upper punch and a lower die, and as shown in FIG. 2A, punches the center of the strip-shaped connecting portion 13 with a certain width. It has become.

In this way, when a part of the connecting portion 13 (that is, the separation piece 13a) is removed and the other connecting portion 13 of the long iron core piece 14 is bent to form the annular core piece 15, the disconnected connecting portion 13 is cut. As shown in FIG. 2 (B), the wrap portion is not formed. Therefore, when the annular core pieces 15 are caulked and laminated, there is an effect that a partial thickness increase due to the connecting portion 13 does not occur. Further, the punching area 21 of the separation piece 13a is not limited to the center of the connecting portion 13, and when the long iron core piece 14 is formed in an annular shape, the punched area 21 is punched wherever the cut connecting portion does not overlap. May be.

3A and 3B show an example in which the width of the connecting portion punching die 20 is wide, but the punching area 22 of the separation piece 13b is the punching area 21 shown in FIG. It is getting wider. As a result, even if the connecting portion 13 of the long core piece 14 is bent to form the annular core piece 15, the remaining adjacent connecting portions 13 from which the separating pieces 13b are removed do not overlap. Therefore, the cutting width of the connecting portion 13 is about 0.1 to 0.8 times the length of the connecting portion 13, and when the long iron core piece 14 is annular, the cut connecting portion 13 does not overlap. Become.

Then, the manufacturing method of the laminated core which concerns on the 2nd Embodiment of this invention is demonstrated. As shown in FIG. 4, first, a strip-shaped core piece 23 in which a large number of segment core pieces 12 are connected by a connecting portion 13 is continuously manufactured from the thin strip material 10 by a mold device 22 a. Wrap and store. Then, the strip-shaped core piece 23 wound with the reel is unwound, passed through the die unit 25 for punching the connecting portion, the center position of the connecting portion 13 is cut with a width, and the segment core piece 12 has one turn. The shank core piece 14 is manufactured.

The long iron core piece 14 is bent at the connecting portion 13 to form an annular iron core piece 15, which is caulked and laminated to form a laminated iron core. At this time, since the cutting positions of the connecting portions 13 of the annular core pieces 15 are stacked while being shifted in the circumferential direction, the cut connecting portions 13 are not adjacent to each other, and a laminated iron core having a strong structure is formed. .

In the embodiment described above, two magnetic pole pieces are provided in one segment core piece, but may be one, or three or more.
In the above-described embodiment, the long core pieces are transported to different positions and the annular core pieces are stacked. However, after the long core pieces are manufactured, the annular core pieces may be directly stacked.
Moreover, in the said embodiment, although the laminated iron core was used for the rotor, this invention is applied even if it is a stator.
In addition, the present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention.

10: Thin strip material, 11: Mold device, 12: Segment core piece, 13: Connection part, 13a, 13b: Separation piece, 14: Long core piece, 15: Ring core piece, 16: Magnetic pole piece, 18 : Concave portion, 19: convex portion, 20: connecting portion punching die, 21, 22: punching area, 22a: die device, 23: strip-shaped core piece, 24: reel, 25: die device

Claims (5)

A long core piece for one turn is separated and separated from a linear strip-shaped core piece obtained by connecting segment iron pieces having one or more magnetic pole pieces at a connecting portion, and the long core piece In a method of manufacturing a laminated core in which the annular core pieces are sequentially laminated,
Separation of the connecting portion is performed by removing a separation piece having a constant width, and prevents formation of the remaining connecting portion by removing the separation piece from the connecting portion when forming the annular core piece from the long iron core piece. A method for producing a laminated iron core, characterized by comprising: 2. The method of manufacturing a laminated core according to claim 1, wherein the long core piece is formed in an annular shape, with a concave portion formed at one end of the long core piece and a convex portion formed at the other end. The manufacturing method of the laminated iron core characterized by preventing the shift | offset | difference of radial direction of this. 3. The method for manufacturing a laminated core according to claim 1, wherein the connecting portion has a band shape, and the separation piece is formed at a center of the connecting portion. 4. The method of manufacturing a laminated core according to any one of claims 1 to 3, wherein the band-shaped core piece is reel-wound and stored, and when the annular core piece is manufactured, the reel-shaped band-shaped core piece is wound. A method for producing a laminated core, which is unraveled and separated into the long core pieces. It is a laminated core manufactured by the manufacturing method of the laminated core of any one of Claims 1-4, Comprising: It has a clearance gap between the said connection parts cut | disconnected located in the edge part of the said annular core piece. And the connection position of the said cyclic | annular core piece laminated | stacked has shifted | deviated sequentially to the circumferential direction, The laminated core characterized by the above-mentioned.

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