JPH06233501A - Laminated iron core, and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to eliminate a gap between iron core sheets, and to make it possible to manufacture an iron core having a small lamination width without distortion, damage to coating of the iron core sheets and the collapse of laminates. CONSTITUTION:A number of iron core sheets 15-17 having a number of caulked sections 12 and 13 are sequentially laminated while protuberances 12a and 13a of the caulked section 12 and 13 are fitted to adjacent recessed portions 12b and 13b of the caulked sections 12 and 13. In a laminated iron core 10 having such a structure, through-holes 18 and 19 are alternately drilled, in the direction of lamination of the iron core sheets 15-17, on either side of the ends of the caulked section 12 and 13 of the iron core sheets 16 and 17 which will be laminated. In addition, folded original portions 12c and 13c of the caulked sections 12 and 13 are positioned in the through-holes 18 and 19 of the adjacent iron core sheets 16 and 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated core and a method for manufacturing the same, and more specifically, it is possible to eliminate a gap between the core pieces and to coat the core pieces having a small laminated thickness without distortion. The present invention relates to a laminated iron core that can be manufactured without breaking and without causing a seat collapse, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in the field of electric equipment, a laminated iron core used for a squirrel cage rotor of an induction motor has been known. In this iron core, the iron core pieces provided with a plurality of crimped portions are sequentially pulled out from the strip material for the iron core pieces by the punch and the die, and the pulled-out iron core pieces are adjacent to the convex portions of the crimped portions in the die. It is manufactured by stacking while fitting in the concave portion of the caulking portion. As for the shape of the caulking portion, the caulking portion 101 of the iron core piece 100 has a saucer-shaped cross-sectional shape as shown in FIG. 7A, and the V-shaped cross-sectional shape as shown in FIG. 7B. It is known that one end has a through hole as shown in FIG. 7 (c). In FIG. 7, reference numeral 102 indicates a through hole formed in the lowermost iron core piece 100.

[0003]

However, in the above-mentioned conventional laminated iron core, when the caulking portions 101 are fitted to each other, the inclined surface 101a of the convex portion of the caulking portion 101,
The inclined surfaces 101b of the concave portions of the adjacent caulking portions 101 are brought into contact with each other to be fitted. However, since the inclined surfaces 101a and 101b of these concave and convex portions are usually steep, the inclined portions are geometrically shaped. Interfering with each other, each iron core piece 1
The height of the manufactured iron core is increased due to the formation of the gap 103 between 00, and the number of laminated iron core pieces is reduced. Therefore, the iron core pieces must be stacked further, and the iron core thickness is increased. Conventionally, as a countermeasure against this, a large pressure is applied to the iron core piece 1.
A method of improving the adhesion between the iron core pieces 101 in addition to the lamination direction of 01 is known. However, if this is done, the iron core may be distorted or the coating applied to the iron core pieces 101 may be damaged. There was a problem that the seat collapsed. The present invention has been made in view of such a situation, it is possible to eliminate the gap between the core pieces without applying a large pressure to the core from the stacking direction of the core pieces, whereby the core having a small stacked thickness, without distortion. An object of the present invention is to provide a laminated iron core that can be manufactured without damaging the coating of the iron core piece and causing no seat collapse, and a method for manufacturing the same.

[0004]

A method according to the above-mentioned object.
The laminated core described is a laminated core in which a plurality of core pieces each having a plurality of crimped portions are sequentially laminated while fitting the convex portions of the crimped portions into the concave portions of the adjacent crimped portions, and are laminated. At the end of the caulking portion of the iron core piece, through holes are alternately punched left and right toward the stacking direction of the iron core piece, the bent base portion of the caulking portion is a through hole of the adjacent iron core piece. It is structured to be located. The present invention is also applicable to the case where the adjacent core pieces are skewed and intermittently rotated when the core pieces are stacked. In addition, the case where the base portion of the crimped portion is located in the through hole of the adjacent iron core piece includes not only the case where the base portion of the crimped portion is inside the through hole but also the case where it is on the extension of the through hole. The method for manufacturing a laminated iron core according to claim 2, wherein a plurality of caulking portions are provided on a progressively fed strip material by a pressing process, and the iron core pieces provided with the caulking portions are sequentially punched by a punch, and the iron core pieces are punched in the die. In a method of manufacturing an iron core in which convex portions of caulking portions are fitted into concave portions of the adjacent caulking portions, in a method of manufacturing the iron core, a first station for punching a through hole at a position corresponding to one end of each caulking portion, respectively. A second station for punching a through hole at a position corresponding to the other end of the caulking portion, and punching the through hole in the strip by alternately operating the first and second stations, Next, the strips are provided with the crimped portions connected to the respective through holes, and then, when the iron core pieces are stacked, the bent base portions of the crimped portions of the iron core pieces are adjacent to each other. And it is configured to be positioned in the through-hole.

[0005]

According to the laminated iron core and the method for manufacturing the laminated iron core of claims 1 and 2, at the end of the caulking portion of the laminated iron core piece,
Since the through holes are bored alternately in the left and right directions in the stacking direction of the core pieces, when the core pieces are stacked, the bent base part of the caulking part of the core pieces to be stacked is made into the through hole of the adjacent core piece. When the core pieces are stacked, the inclined surfaces of the crimped portions of the adjacent laminated cores do not come into contact with each other, and when the core pieces are manufactured, the iron cores are not applied with a large pressure from the stacking direction of the core pieces. It is possible to eliminate the gap between the pieces, so that the iron core with a small laminated thickness has less distortion,
It can be manufactured without damaging the coating of the iron core piece and causing no seat collapse.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is an enlarged cross-sectional view of a main part of a laminated core according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a plan view showing a manufacturing process of an iron core piece constituting the laminated core of the embodiment. FIG. 4 is a sectional view of a manufacturing apparatus for manufacturing the laminated core of the embodiment, FIG. 5 is an enlarged sectional view of an essential part of the manufacturing apparatus of FIG. 4, and FIG. It is a table which shows a process.

As shown in FIGS. 1 and 2, in a laminated iron core 10 according to an embodiment of the present invention, four caulking portions 12 and 13 and a large number of slot holes 14 are radially provided around a central hole 11. The iron core pieces 15 to 17 provided are laminated by a predetermined number. Specifically, as shown in FIG. 1, the first iron core piece 16 and the second iron core piece 17 are provided on the lowermost iron core piece 15 and the convex portion of the caulking portion 12 of the first iron core piece 16 is provided. 1
2a and the concave portion 12b, the caulking portion 13 of the second iron core piece 13
While fitting the concave portion 13b and the convex portion 13a of
A predetermined number of sheets are alternately laminated. A through hole 18 is bored in one end of the caulking portion 12 of the first iron core piece 16, and the other end of each caulking portion 13 of the second iron core piece 17 (an end portion in which the through hole 18 is bored (The end opposite to)
Further, a through hole 19 is drilled. That is, these through holes 18 and 19 are alternately arranged in the stacking direction of the core pieces 16 and 17. In addition, the core pieces 16 and 17 of the adjacent steps are formed in the through holes 18 and 19 of the core pieces 16 and 17 which are on the lower side, and of the crimped portions 12 and 13 which are provided on the core pieces 16 and 17 which are on the upper side. Bent base 12c, 1
3c is located. In addition, in the lowermost iron core piece 15,
Four through holes 20 into which the crimped portions 12 of the first iron core piece 16 of the second stage are fitted are radially drilled.

Next, the laminated core manufacturing apparatus 21 will be described in detail with reference to FIGS. As shown in FIG. 4, a laminated iron core manufacturing apparatus 21 has horizontally long and large upper and lower molds 22 and 23. The upper and lower molds 22 and 23 process the strip 24 of the core pieces 16 and 17. 1 to 5 stations S1 to S5 are provided. In the first station S1, the through hole 1 is formed in the punching portion 24A of the first iron core piece 16 in the strip 24.
8 is a station for punching, and the second station S
2 is a station for punching a through hole 19 in the punched portion 24B of the second iron core piece 17 in the strip 24.
In addition, the third station S3 has punched parts 24A, 2
4B is a station for punching the center hole 24a and the slot hole 24b, and the fourth station S4 is a through hole 2 which is connected to the through holes 18 and 19 of the punched portions 24A and 24B.
0 (in the case of the lowermost iron core piece 15), caulking portion 12 (first
Of the iron core piece 16) and the crimped portion 13 (in the case of the second iron core piece 17). further,
The fifth station S5 has a punching portion 24 for the strip 24.
This is a station for manufacturing the laminated core 10 while alternately punching A and 24B and fitting the connecting portion 20 and the crimped portions 12 and 13 in order.

These first to fifth stations S1 to S5
A predetermined number of punches 25A to 29A and dies 25B to 29B, respectively, and below the upper die 22, when the first and second iron core pieces 16 and 17 are punched out, the strip 2
A stripper 31 that elastically contacts the lower die 23 from above is attached. The punch 2 of the fourth station S4
8A has an arc-shaped cross section, and is provided with inclined surfaces at both ends of the tip (see columns A-c in FIG. 6). Figure 4,
As shown in FIG. 5, in the first station S1, a cam follower 32 is fixed to the upper die 22 at the upper end of the punch 25A, and the cam follower 32 is biased upward by a spring 33. Cavity 2 provided in the upper mold 22
A horizontally long cam 34 with respect to the cam follower 32 is housed in the 2a so as to be slidable in the lateral direction, and a cylinder attached to the lid member 36 of the hollow portion 22a by a bracket 35 on the end surface of the cam 34 on the base side. The rod 38 of 37 is fixed. When the rod 38 of the cylinder 37 is moved in and out, the cam follower 32 urged upward by the cam 34 via the spring 33 moves up and down, and the punch 25A moves up and down. The upper mold 22 of the second station S2 and the fourth station S4 also has punches 26A and 28A.
A similar mechanism for raising and lowering A is provided.

As shown in FIG. 4, the fifth station S5
In the lower mold 23, a vertical hole 39 communicating with the hole of the die 29B is bored, and a horizontal hole 40 is communicated with the vertical hole 39. A cylinder 41 is provided below the vertical hole 39, and an elevating table 43 is fixed to the tip of the rod 42.
When punching the iron core pieces 15 to 17, the iron core pieces 15 to
Every time 17 is pulled out into the hole of the die 29B one by one, the rod 42 of the cylinder 41 is pulled in, and the lifting table 4 is moved.
3 is lowered by the thickness of one of the iron core pieces. Iron core piece 15
When the punching of ~ 17 is completed, the laminated core 10 manufactured by pulling the rod 42 largely is lowered to the lateral hole 40, and the rod 4 of the cylinder 44 arranged in the lateral hole 40.
By making 5 project, the laminated core 10 is carried out in the arrow direction. In the figure, reference numeral 46 indicates a pilot hole of the strip 24.

Next, a method of manufacturing the laminated core 10 according to the embodiment of the present invention will be described. As shown in FIGS. 3 and 4, the strip 24 is sequentially fed between the upper and lower molds 22 and 23. First
In the station S1 and the second station S2, when the upper and lower dies 22 and 23 are fitted, the punch 25A and the die 25B
While punching alternately the punch 26A and the die 26B alternately, the through hole 18 is formed in the punching portion 24A of the first iron core piece 16.
(See columns A-a and B-a in FIG. 6), and a through hole 19 is formed in the punched-out portion 24B of the second core piece 17 (see columns A-b and B-b in FIG. 6). . When hitting blanks,
This is performed by pulling in the rod 38 of the cylinder 37 attached to the upper die 22, separating the cam 33 from the cam follower 32, and raising the punch 25A or 26A (see FIG. 5).

Then, in the third station S3,
Punches 27A and dies 27B on punching parts 24A and 24B.
Thus, the central hole 24a and the slot hole 24b are sequentially drilled. Then, in the fourth station S4, the punch 28A and the die 28B are provided with the caulking portion 12 connected to the through hole 18 of the punching portion 24A (see A in FIG. 6).
-CI, Bx-cI columns), and the caulking portion 13 connected to the through hole 19 of the punched portion 24B (A-c in FIG. 6).
II, Bx-cII column). In the case of the punched-out portion for the lowermost iron core piece 15, as shown by the chain line in the A-cI or cII column of FIG.
By punching out 2 and 13, punching portions 24A, 2
A through hole 20 is drilled in 4B (see column By-cI or cII in FIG. 6). The method of using the punch 27A for the lowermost iron core piece 15 and for the other first and second iron core pieces 16 and 17 is as follows.
This is done by moving the rod 38 in and out to attach / detach the cam follower 32 and the cam 33 (see FIG. 5), and raise / lower the punch 27A fixed to the lower surface of the cam follower 32.

Then, in the fifth station S5,
With the punch 29A and the die 29B, the punched-out portions 24A and 24B of the strip 24 are made into the convex portions 1 of the crimped portions 12 and 13.
2a, 13a adjacent to the concave portion 13 of the caulking portion 13, 12
While being fitted to b and 12b, they are alternately drawn into the die 29B to manufacture the laminated core 10 shown in FIG. That is, as shown in FIG. 1, the caulking portion 12 of the first iron core piece 16 is fitted into the through hole 20 of the lowermost iron core piece 15 so that the lowermost and second iron core pieces 16 are fitted. 15, 16
Are stacked and fitted in the through hole 18 of the second-stage core piece 16 with the base portion 13a of the caulked portion 13 provided on the third-stage second core piece 17 being positioned. By doing so, the iron core pieces 16 and 17 of the second and third stages are laminated. Further, the base portion 12a of the caulking portion 12 provided on the first iron core piece 16 of the fourth stage is positioned in the through hole 19 of the third core piece 17 and is fitted in the through hole 19. Thereby, the core pieces 16 and 17 of the predetermined number are alternately laminated on the core piece 15 such that the third and fourth core pieces 17 and 16 are laminated.

The iron core pieces 16 and 17 thus laminated
Since through holes 18 and 19 are alternately bored at the ends of the crimped portions 12 and 13 of the iron core pieces 15 to 17 in the laminating direction of the iron core pieces 15 to 17, they are laminated when the iron core pieces 15 to 17 are laminated. The bent base portions 12c and 13c of the crimped portions 12 and 13 of the iron core pieces 16 and 17 that are adjacent to each other.
By laminating the laminated cores 10 positioned in the through holes 19 and 18, the space between the core pieces 16 and 17 is not required to be applied to the laminated core 10 after the laminated core 10 is manufactured, even if a large pressure is applied to the laminated core 10 in the laminating direction of the core pieces 16 and 17. It is possible to eliminate the gap, whereby the laminated iron core 10 having a small laminated thickness can be manufactured with less distortion, without damaging the coating of the iron core pieces 15 to 17 and without causing a seat collapse.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and even if there is a design change or operation change within the scope not departing from the gist, the present invention is included. Be done. For example, in the embodiment, an iron core made of an iron core piece having a central hole has been described as an example, but the present invention is not limited to this, and an iron core piece having no central hole may be used.
Further, in the embodiment, the laminated core for the rotor has been described as an example, but the present invention is not limited to this, and the laminated core for the stator can be adopted.

[0016]

According to the laminated core and the method for manufacturing the laminated core according to the first and second aspects of the present invention, the end portions of the crimped portions of the laminated core pieces are alternately penetrated to the left and right in the laminating direction of the core pieces. Since the holes are drilled, when the core pieces are laminated, the bent base of the crimped part of the core pieces to be laminated is positioned in the through hole of the adjacent core piece and laminated, thereby manufacturing the core. Later, without applying a large pressure to the iron core from the lamination direction of the iron core piece, it is possible to eliminate the gap between the iron core pieces, whereby the iron core with a small laminated thickness has less distortion and does not damage the coating of the iron core piece, It can be manufactured without causing a seat collapse.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a laminated core according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view showing a manufacturing process of an iron core piece that constitutes the laminated iron core of the embodiment.

FIG. 4 is a cross-sectional view of a manufacturing apparatus for manufacturing the laminated core of the above-mentioned embodiment.

5 is an enlarged cross-sectional view of a main part of the manufacturing apparatus in FIG.

6 is a table showing a process of processing a strip material in a required station of the manufacturing apparatus of FIG.

FIG. 7 is an enlarged sectional view of a main part of a laminated core according to a conventional means.

[Explanation of Codes] 10 Laminated iron core 11 Center hole 12 Caulking portion 12a Convex portion 12b Recessed portion 12c Recessed portion 13 Caulked portion 13a Convex portion 13b Recessed portion 13c Recessed portion 14 Slot hole 15 Lowermost iron core piece 16 First iron core piece 17th Iron core piece 18 2 Through hole 19 Through hole 20 Through hole 21 Manufacturing device 22 Upper mold 22a Cavity 23 Lower mold 24 Article 24A Punching part 24B Punching part 24a Center hole 24b Slot hole 25A punch 25B die 26A punch 26B die 27A punch 27B Die 28A Punch 28B Die 29A Punch 29B Die 31 Stripper 32 Cam Follower 33 Spring 34 Cam 35 Bracket 36 Lid 37 Cylinder 38 Rod 39 Vertical Hole 40 Horizontal Hole 41 Cylinder 42 Rod 43 Lifting Table 44 Cylinder 45 Rod S1 First station S2 Second station S3 Third station S4 Fourth station S5 Fifth station

Claims (2)

[Claims] 1. A laminated iron core in which a plurality of iron core pieces each having a plurality of caulking portions are sequentially laminated while fitting a convex portion of the caulking portion into a concave portion of the adjacent caulking portion At the end of the crimped portion of the iron core piece, through holes are alternately punched left and right toward the stacking direction of the iron core piece,
The laminated iron core, wherein the bent base portion of the crimped portion is located in the through hole of the adjacent core piece. 2. A plurality of caulking portions are provided on a progressively-stretched strip material by a pressing process, iron core pieces provided with the caulking portions are sequentially punched out, and the convex portions of the caulking portions are adjacent to each other in a die. In a method of manufacturing an iron core, which is laminated while fitting into a recess of the caulking portion, a first station for punching a through hole at a position corresponding to one end of each caulking portion, and the other end of each caulking portion. 2nd punching through hole at a position corresponding to
The station is provided, the first and second stations are alternately operated to punch the through hole in the strip, and then the strip is provided with the caulking portion connected to the respective through holes. Then, when stacking the iron core piece, the bent base of the caulking portion of the iron core piece,
A method for manufacturing a laminated core, wherein the core pieces are positioned in through holes of the adjacent core pieces.