JPH06245439A - Manufacture of laminated core - Google Patents

Abstract

PURPOSE:To manufacture a skew type laminated core having improved characteristics of a rotor, high reliability and high quality by preventing the introduction of melted aluminum into a skew through hole of a caulked part and eliminating a gap between core pieces even without external pressure. CONSTITUTION:A first station for punching a through hole 18 at a position corresponding to one end of a caulked part 12 of a core piece 16 and a second station for punching a through hole 19 at a position corresponding to the other end of a caulked part, 13 are provided. The first and second stations are alternately operated to open through holes 18-19 at a stripe material, and then caulked parts 12, 13 to be connected to the hole 18, 19 are provided at the material. Then, when the pieces 16, 17 are laminated, bent roots 13c, 13c of the parts 12, 13 of the pieces 16, 17 are disposed in the holes 13, 13 of the pieces 16, 17, and the pieces 16, 17 are laminated while skewing them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a laminated core, and more particularly to a method of manufacturing a skew-type laminated core of a rotor.

[0002]

2. Description of the Related Art Conventionally, in this type of skew-type laminated iron core, as shown in FIG. 8, a flat portion 102 is provided at the tip of an inclined portion 101 formed in an iron core piece 100, and a relief for skew is provided at the tip. The convex portion of the tongue-shaped crimp portion 104 in which the through-hole 103 that is a hole is punched is brought into contact with the concave portion of the adjacent crimp portion 104 having the same shape to be fitted.

[0003]

However, in the conventional laminated iron core, as shown in FIG.
Since the iron core pieces 100 were laminated with the through holes 103 punched in
There is a problem in that a hollow portion 105 formed of continuous through holes 103 is formed, and when a rotor is formed by die casting, molten aluminum flows into the hollow portion 105 to form a conduction circuit. Also, the caulking portion 104
By sloping the inclined portions 101 of each other and geometrically interfering with each other, a gap is formed between the respective iron core pieces 100,
There is a problem that the number of laminated layers differs with respect to the required thickness of the laminated core, and molten aluminum enters the gap between the core pieces 100. Therefore, a large crimping pressure is applied from the stacking direction of the iron core piece 100 to the iron core piece 1.
There is known a method of improving the adhesiveness between 00s. However, in this method, the laminated core may be distorted, the coating applied to the core piece 100 may be damaged, or the seat core may be misaligned. There was a new problem that reduced the characteristics of the child. The present invention has been made in view of such an actual situation, and it is possible to prevent molten aluminum from flowing into a through hole for skew formed at one end of the caulking portion, and to apply a large pressure to the laminated core from the laminating direction of the core piece. It is possible to eliminate the gap between the core pieces without adding the core core, and to provide a manufacturing method of a laminated core that enables manufacturing of a reliable and high-quality skewed laminated core that improves the characteristics of the rotor. To aim.

[0004]

A method according to the above-mentioned object.
The method for manufacturing a laminated core described above, a plurality of tongue-shaped crimped portions are provided by a pressing process on a strip material to be sequentially fed, and a disk-shaped iron core piece provided with the crimped portions is sequentially punched by a punch, A method for manufacturing a skew-type laminated iron core, in which the convex portion of the crimped portion is laminated in the die while being fitted into the concave portion of the crimped portion of the iron core piece that is punched first and rotated by an angle corresponding to the skew angle, , A first station for punching a through hole at a position corresponding to one end of each caulking portion and a second station for punching a through hole at a position corresponding to the other end of each caulking portion are provided. , The first and second stations are alternately operated to perforate the through hole in the strip, and then the strip is provided with the caulking portion connected to each of the through holes, and then the core piece is attached. When layering, the bent base of the crimped portion of the iron core piece is located in the through hole of the adjacent iron core piece, and the iron core pieces are laminated while being rotated by an amount corresponding to the skew angle. Has been done.
In the method for manufacturing a laminated core according to claim 2, a V-shaped skew that reverses the skew direction during lamination is adopted as the skew when the core pieces are laminated. In addition, here, the case where the base portion of the caulking portion is located in the through hole of the adjacent iron core piece includes not only the case where the base portion of the caulking portion is inside the through hole but also the case where the base portion is on the extension of the through hole.

[0005]

In the method for manufacturing a laminated core according to claims 1 and 2, since the through holes are alternately bored at the ends of the crimped portions of the laminated core pieces in the laminating direction of the core pieces. Therefore, unlike the prior art, it is not necessary to form a cavity in which the through holes overlap and communicate with each other. Furthermore, when stacking the iron core pieces, unlike the conventional technique, the inclined surfaces of the caulking portions of the adjacent iron core pieces do not overlap each other, so that the gap between the iron core pieces of the laminated iron core can be eliminated and the iron core pieces can be eliminated. It is possible to prevent internal residual strain, coating breakage and 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 a partially enlarged sectional view of a laminated core manufactured by the method for manufacturing a laminated core according to the first embodiment of the present invention, FIG. 2 is the same perspective view, and FIG. 3 is the first embodiment. FIG. 4 is a plan view of a strip showing the manufacturing process of the laminated core according to FIG.
4 is a sectional view of a laminated core manufacturing apparatus used in the laminated core manufacturing method according to the embodiment of the present invention, FIG. 5 is an enlarged sectional view of an essential part of the manufacturing apparatus of FIG. 4, and FIG. 6 is a required station of the manufacturing apparatus of FIG. FIG. 7 is a partial enlarged cross-sectional view of a laminated core manufactured by the method for manufacturing a laminated core according to the second embodiment of the present invention, which shows a process for processing a strip material.

First, a method of manufacturing a laminated core according to the first embodiment of the present invention will be described. As shown in FIGS. 1 and 2, a laminated core 10 for a rotor manufactured by the method for manufacturing a laminated core according to the first embodiment of the present invention has a central hole 11 respectively.
The disk-shaped iron core pieces 15 to 17 radially provided with four arc-shaped crimp portions 12 and 13 and a large number of slot holes 14 are laminated while skewing a predetermined number of sheets. . Specifically, as shown in FIG. 1, a predetermined number of first core pieces 16 and second core pieces 15 are provided on the bottommost core piece 15.
Alternately with the iron core piece 17 of No. 1, the concave portion 13b and the convex portion 13a of the caulking portion 13 of the second iron core piece 13 are fitted into the convex portion 12a and the concave portion 12b of the caulking portion 12 of the first iron core piece 16, respectively. While being skewed, they are stacked. First
A through hole 18 is bored in one end of the crimped portion 12 of the iron core piece 16 of FIG.
A through hole 19 is formed at the other end (the end in the direction opposite to the end where the through hole 18 is formed). 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 12
c and 13c are located. In addition, the bottom core piece 15
In this case, four arc-shaped through holes 20 into which the crimped portions 12 of the first iron core piece 16 in the second stage are fitted are radially drilled.

Next, the manufacturing apparatus 21 for the laminated core 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. As shown in FIGS. 3 and 4, the first station S1 is a station for punching the through hole 18 in the punched portion 24A of the first iron core piece 16 in the strip 24, and the second station S2 is the strip 24. In the punching portion 24B of the second iron core piece 17 in FIG. Also, the third station S3
Is a station for punching the center hole 24a and the slot hole 24b in the punched portions 24A, 24B, and the fourth station S4 is the through hole 1 of the punched portions 24A, 24B.
A station for providing a through hole 20 (in the case of the lowermost core piece 15), a crimped portion 12 (in the case of the first iron core piece 16) and a crimped portion 13 (in the case of the second iron core piece 17) connected to 8 and 19 (See also FIG. 1). Further, in the fifth station S5, the punching portions 24A and 24B of the strip 24 are punched alternately to skew the laminated core pieces 15 to 17, and the connecting portion 20 and the crimping portions 12 and 13 are
It is a station for manufacturing the laminated iron core 10 by sequentially fitting them.

As shown in FIG. 4, each of the first to fifth stations S1 to S5 has a predetermined number of punches 2.
5A to 29A and dies 25B to 29B are arranged, and a stripper for elastically contacting the strip member 24 with the lower die 23 from above when punching the first and second iron core pieces 16 and 17 below the upper die 22. 31 is attached. The punch 28A of the fourth station S4 has an arc-shaped cross section and is provided with inclined surfaces at both ends of the tip (A- in FIG. 6).
Also, a worm wheel 23a is provided on the lower outer peripheral surface of the die 29B of the fifth station S5, and by rotating the worm 23b fixed to the shaft of the motor M, the die 29B passes through the bearing 23c. Intermittent rotation (skew) is made to the right or left by a predetermined skew angle. As shown in FIGS. 4 and 5, in the first station S1, the upper die 22 has
A cam follower 32 is fixed to the upper end of the punch 25A, and the cam follower 32 is biased upward by a spring 33. A horizontally long cam 34 with respect to the cam follower 32 is slidably housed in the cavity 22a provided in the upper die 22 in the lateral direction. The rod 38 of the cylinder 37 attached to the lid member 36 of 22a 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 die 22 of the second station S2 and the fourth station S4 is also provided with a similar mechanism for raising and lowering the punches 26A and 28A.

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. After this, the skew of the die 29B by the motor M described above is performed. When the punching of the iron core pieces 15 to 17 is completed, the rod 42 is largely retracted to produce the manufactured laminated iron core 1.
The laminated core 10 is carried out in the arrow direction by lowering 0 to the lateral hole 40 and projecting the rod 45 of the cylinder 44 arranged in the lateral hole 40. In addition, in FIG.
Reference numeral 46 indicates a pilot hole of the strip 24.

Next, a method of manufacturing the laminated core 10 according to the first 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.
In the first station S1 and the second station S2, when the upper and lower dies 22 and 23 are fitted to each other, the punch 25A-die 25B and the punch 26A-die 26B are alternately blanked while the punching portion of the first core piece 16 is punched. Through hole 18 is formed in 24A (see columns Aa and Ba in FIG. 6), and through hole 19 is formed in punched portion 24B of second core piece 17 (Ab and B in FIG. 6). -See column b). The idle driving 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, see Bx-cII column). In addition, the bottom iron core piece 1
In the case of the punched-out portion for No. 5, A-cI or c in FIG.
As shown by the chain line in column II, the punched portion 24 is punched out by punching the crimped portions 12 and 13.
A through hole 20 is formed in A and 24B (By-cI in FIG. 6).
Or see column cII). 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 to insert and remove the rod 38 of the cylinder 37 attached to the upper die 22. Cam follower 3
2 is attached to and detached from the cam 33 (see FIG. 5), and the punch 27A fixed to the lower surface of the cam follower 32 is moved up and down.

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. At this time, the die M is intermittently rotated in one direction by a slight skew angle by the motor M, so that the skewed laminated core 10 shown in FIGS.
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 iron core piece 15 and the second iron core piece 15 are inserted. , 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. As a result, a predetermined number of iron core pieces 16 and 17 are alternately stacked on the iron core piece 15 while being skewed, such that the third and fourth iron core pieces 17 and 16 are laminated.

The iron core pieces 16 and 17 thus laminated
Since the through holes 18 and 19 are alternately bored at the ends of the crimped portions 12 and 13 in the stacking direction of the iron core pieces 15 to 17, the through holes overlap and communicate with each other as in the prior art. Since the parts are not formed, it is possible to eliminate the fact that molten aluminum etc. flows into this cavity when a rotor is formed by die casting and a conduction circuit is formed, which significantly improves the rotor characteristics. It is possible to manufacture the laminated core. Further, when stacking the iron core pieces 15 to 17, unlike the prior art, the adjacent iron core pieces 16,
Since the inclined surfaces of the crimped portions 12 and 13 of 17 do not overlap each other, it is possible to eliminate the gap between the iron core pieces 16 and 17 of the laminated iron core 10, whereby the iron core pieces 15 to 17 are formed.
It is possible to prevent internal residual strain, coating breakage and seat collapse. Next, with reference to FIG. 7, a method of manufacturing a laminated core according to the second embodiment of the present invention will be described. As shown in FIG. 7, the method of manufacturing the laminated core 50 of the second embodiment is a method of skewing the core pieces 15 to 17,
A V-shaped skew that reverses the skew direction during the lamination of the iron core pieces 15 to 17 is adopted. This V-shaped skew is performed by reversing the rotation direction of the motor M of the fifth station S5 and changing the rotation direction of the die 29B while the iron core pieces 15 to 17 are being laminated.

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 first embodiment, as shown in FIG. 1, the skew direction of the iron core piece is the right direction in the drawing, but the skew direction is not limited to this, and may be the left direction in the drawing.

[0016]

In the method for manufacturing a laminated core according to the first and second aspects of the present invention, since there is no formation of a cavity which is formed by overlapping through holes and communicating with each other as in the prior art, when the rotor is formed by die casting. In addition, it is possible to solve the problem that molten aluminum or the like flows into the hollow portion to form a conduction circuit, and thus it is possible to manufacture a laminated iron core with significantly improved rotor characteristics. Further, when stacking the core pieces, since the inclined surfaces of the crimped portions of the adjacent core pieces do not overlap with each other, it is possible to eliminate a gap between the core pieces of the laminated core without applying a large pressure, and thus the core pieces can be eliminated. It is possible to provide a high-quality laminated core that can prevent internal residual strain, coating breakage, and seat collapse, and has no difference in the number of laminated layers with respect to the required thickness of the laminated core.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a laminated core manufactured by a method for manufacturing a laminated core according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view of a strip showing a manufacturing process of the laminated core according to the first embodiment.

FIG. 4 is a cross-sectional view of a laminated core manufacturing apparatus used in the method for manufacturing a laminated core according to the first 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 a partially enlarged cross-sectional view of a laminated core manufactured by the method for manufacturing a laminated core according to the second embodiment of the present invention.

FIG. 8 is a partially enlarged sectional view of a laminated core according to a conventional means.

[Explanation of symbols]

 10 Laminated iron core 11 Center hole 12 Caulking portion 12a Convex portion 12b Recessed portion 12c Base portion 13 Caulked portion 13a Convex portion 13b Recessed portion 13c Base portion 14 Slot hole 15 Bottom iron core piece 16 First iron core piece 17 Second iron core piece 18 Through hole 19 Through hole 20 Through hole 21 Manufacturing device 22 Upper die 22a Cavity 23 Lower die 23a Worm wheel 23b Worm 23c Bearing 24c Material 24A Stamping 24B Stamping 24a Center hole 24b Slot hole 25A Punch 25B 26B Die 26A Punch 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 42R De 43 elevating platform 44 the cylinder 45 the rod 50 laminated core M motor S1 first station S2 second station S3 third station S4 fourth station S5 fifth station

Claims (2)

[Claims] 1. A plurality of tongue-shaped caulking portions are provided on a progressively-stretched strip material by pressing, and the disk-shaped iron core pieces provided with the caulking portions are sequentially punched by a punch, and the strip-shaped iron core pieces are punched in a die. A method for manufacturing a skew-type laminated iron core, wherein the convex portion of the crimped portion is punched first and is fitted into the concave portion of the crimped portion of the iron core piece that has been rotated by an angle corresponding to the skew angle, each of A first station for punching a through hole at a position corresponding to one end of a caulking portion, and a second station for punching a through hole at a position corresponding to the other end of each caulking portion.
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 laminated while being positioned in the through holes of the adjacent core pieces while rotating the core pieces by an amount corresponding to a skew angle. 2. The method of manufacturing a laminated core according to claim 1, wherein the skew of the iron core piece is a V-shaped skew in which the skew direction is reversed during the lamination of the iron core pieces.