JPH05137280A - Manufacture of laminated core - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of thin steel plates are stacked to form a laminated block by fitting and fixing the convex portions 2 and the concave portions 3 of the adjacent thin steel plates. 1b
Of the thin laminated steel plate of the other laminated block 1a facing the sheet 2
The escape hole 5 is provided in the vicinity of, the adjacent laminated blocks are joined together to form the temporary laminated core 7'for one unit, the laminated block is separated from the temporary laminated core 7 ', and the adjacent laminated blocks are rotated with respect to each other. Then, the method is a method for manufacturing a laminated core in which the concave portions 2 of the thin steel plates of the adjacent one laminated block are fitted into the convex portions 3 of the thin steel plate of the other laminated block to join the laminated blocks together. [Effect] It becomes easier to separate and stack the laminated blocks, and the difference in plate thickness and the error of parallelism are evenly distributed in the circumferential direction, and the laminated iron core for one unit is arbitrarily separated during work. It is possible to provide a laminated iron core which is easy to handle and has stable quality without being separated or the adjacent laminated blocks being displaced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated iron core used in a rotary electric machine.

[0002]

2. Description of the Related Art Conventionally, when thin steel plates are laminated to form a laminated iron core of a rotary electric machine, as shown in FIG. A concave portion 3 corresponding to the convex portion 2 is formed on the other side surface, and the convex portion 2 of one of the adjacent thin steel plates 1a is fitted into the concave portion 3 of the other thin steel plate 1b while being pressed. By caulking, the frictional force between the side surface of the convex portion 2 and the side surface of the concave portion 3
Adjacent thin steel plates are fixed together. When the thin steel plates are continuously laminated by such a method to form the laminated iron core 7 for one unit, an error in the plate thickness caused by the roll direction of the material and a caulking portion including a plurality of convex portions and concave portions Due to an error in parallelism between the thin steel plates caused by the difference in rigidity, the laminated iron core may be bent and laminated, or the magnetic characteristics may be uneven depending on the circumferential direction. In order to prevent such bending of the laminated core, one laminated core is separated into a plurality of laminated blocks, and adjacent laminated blocks are rotated and coupled to each other to form a laminated core. In addition, a laminated block is formed by laminating a plurality of thin steel plates and caulking adjacent convex portions and concave portions, and the convex portion is not provided on the first thin steel plate each time the laminated block is formed. Make holes in the holes so that adjacent laminated blocks will not be fixed. Then, a method is disclosed in which adjacent laminated blocks are rotated by a predetermined angle so that differences in plate thickness and errors in parallelism are evenly distributed in the circumferential direction to form one laminated iron core. (For example, Japanese Patent Publication Sho 60-
56383).

[0003]

However, in the former method, it is not easy to separate the laminated core, and a wedge having a special shape is driven between the thin steel plates to separate the laminated core. I was sometimes hurt. In the latter method, the laminated iron core for one unit is disassembled into individual laminated blocks, so that the secondary conductor is die-cast by aluminum, or during the assembly process such as winding a winding wire or during transportation. There was a defect that the adjacent laminated blocks were misaligned and the quality was not stable. INDUSTRIAL APPLICABILITY The present invention provides a high-quality laminated core by facilitating separation of continuously punched thin steel plates into a plurality of laminated blocks and preventing the laminated blocks of one laminated core from being displaced from each other. The purpose is that.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a plurality of thin steel plates are stacked and adjacent convex and concave portions of the thin steel plates are fitted together.
Forming a laminated block by fixing, in the manufacturing method of a laminated core to rotate the adjacent laminated blocks to each other, in the convex portion of the thin steel plate of the other laminated block facing the adjacent one laminated block An escape hole is provided in the vicinity, the adjacent laminated blocks are joined together to form a temporary laminated core for one unit, the laminated blocks are separated from the temporary laminated core, and the adjacent laminated blocks are rotated to each other. In the method for manufacturing a laminated core, the concave portions of the thin steel plate of one laminated block are fitted into the convex portions of the thin steel plate of the other laminated block to join the laminated blocks together.

[0005]

[Function] An escape hole is provided in the vicinity of the convex portion of the thin steel plate facing the adjacent laminated block to facilitate the separation of the adjacent laminated block, and the separated laminated block is rotated to the adjacent laminated block again. Since they are connected, the difference in plate thickness and the error in parallelism are distributed evenly in the circumferential direction, and the laminated iron core for one unit is arbitrarily separated during the working process or during transportation, or adjacent laminated layers. The block does not shift.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
1 (a) is a front view showing an embodiment of a stator core of an electric motor according to the present invention, and FIG. 1 (b) is a side sectional view taken along the line BB in FIG. 1 (a). Protrusions 2 protruding to one side of the thin steel plate 1 are provided at four nearby locations, and as a result, recesses 3 corresponding to the protrusions 2 are formed on the other side. A plurality of such thin steel plates 1 are stacked, the convex portions 2 of the thin steel plates 1a are pressed and fitted into the concave portions 3 of the adjacent thin steel plates 1b, and one laminated block 4a is formed by the same method as the conventional laminated iron core. Form. Here, what is different from the conventional one is the thin steel plate 1c facing the next laminated block 4b among the thin steel plates of the laminated block 4a.
Is provided with a narrow elongated hole-shaped escape hole 5 penetrating the thin steel plate 1c at intervals along the inner peripheral side and the outer peripheral side in the vicinity of each convex portion 2. A deformed portion 6 is formed between the convex portion 2 and the escape hole 5, and the convex portion of the thin steel plate 1c of the laminated block 4a and the concave portion 3 of the thin steel plate 1a of the laminated block 4b are coupled and this coupling is repeated. One unit of the temporary laminated core 7'consisting of laminated blocks that are continuously connected is formed.
In this state, the deforming portion 6 between the convex portion 2 and the relief hole 5 is released by the frictional force generated according to the tightening margin of the convex portion 2 of the laminated block 4a and the concave portion 3 of the laminated block 4b.
Is deformed by being pressed in the direction of, and the frictional force between the convex portion and the concave portion of the adjacent laminated blocks is reduced, so that the adjacent laminated blocks are easily separated from each other. Next, the laminated block 4a is removed from the temporary laminated iron core 7 ', rotated by the circumferential pitch of the convex portion 2 and superposed on the laminated block 4b, and the convex portion 2 and the laminated block 4b of the thin steel plate 1c of the laminated block 4a are laminated.
The thin block steel plate 1a is fitted with the concave portion 3 and the laminated block 4a
And 4b are combined. This kind of operation is applied to the temporary laminated core 7 '
All the laminated blocks are repeatedly compressed in the laminating direction to form a laminated core having a required laminated thickness. In this way, an escape hole is provided in the vicinity of the convex portion of the thin steel plate facing the adjacent laminated blocks to facilitate the separation of the adjacent laminated blocks, and one laminated iron core separates the separated laminated blocks from each other. Since the convex portion and the concave portion are combined and laminated by rotating by the circumferential pitch of the convex portion, differences in plate thickness and parallelism errors are evenly distributed in the circumferential direction, and one unit is laminated. The iron core is easy to handle and stable in quality because it does not separate in any way during the work process or during transportation and the adjacent laminated blocks do not shift. In addition, the convex portion 2 shown in FIG. 1 is extruded in a V shape on one side surface of the thin steel plate 1a, both side surfaces thereof are cut, and fitted into the concave portion 3 of another thin steel plate 1b. Side surface of the recess 3
Which comes into contact with the cut surface of the thin steel plate 1 appearing on the side surface of the sheet metal, but both side surfaces thereof are not cut by the convex portion, for example, a convex portion and a concave portion that fit a convex portion having a circular cross section into a concave portion having a circular cross section. Any shape can be applied as long as it is a combination of.

[0007]

As described above, according to the present invention, 1
The laminated core for the unit is formed by a laminated block composed of a plurality of thin steel plates, and an escape hole is provided in the vicinity of the convex portion of the thin steel plates facing each other of the laminated blocks so that the laminated blocks can be easily separated from each other. Therefore, the laminated blocks can be easily separated from each other. In addition, since the convex portions and the concave portions are coupled by laminating the laminated blocks by rotating each other by the circumferential pitch of the convex portions, the difference in plate thickness and the parallelism error are evenly distributed in the circumferential direction. At the same time, there is no effect that the laminated core for one unit will be separated freely during the working process or during transportation, and the adjacent laminated blocks will not be displaced, so that the laminated core with easy handling and stable quality can be provided. ..

[Brief description of drawings]

FIG. 1 is a front view and a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front view and a side sectional view showing a conventional example.

[Explanation of symbols]

 1, 1a, 1b, 1c Thin steel plate 2 Convex portion 3 Recessed portion 4a, 4b Laminated block 5 Relief hole 6 Deformed portion 7 Laminated iron core 7'Temporary laminated iron core

Claims (1)

[Claims] 1. A laminated block in which a plurality of thin steel plates are laminated and convex and concave portions of adjacent thin steel plates are fitted and fixed to form a laminated block, and the adjacent laminated blocks are rotated and laminated. In the method for manufacturing an iron core, an escape hole is provided in the vicinity of a convex portion of a thin steel plate of the other laminated block facing the adjacent one laminated block, and the adjacent laminated blocks are joined together to temporarily laminate one unit. An iron core is formed, the laminated blocks are separated from the temporary laminated iron core, adjacent laminated blocks are rotated with respect to each other, and a convex portion of the thin laminated steel plate of the other laminated block is formed in the concave portion of the thin laminated steel plate of the adjacent one laminated block. A method for manufacturing a laminated core, comprising fitting and joining the laminated blocks together.