JPH06284649A - Method and machine for producing laminated core - Google Patents

Abstract

PURPOSE:To provide method and machine for producing a laminated core in which the core piece or the squeeze member is protected against abnormal abrasion or damage due to seizure and residual stress of the core piece is reduced significantly to enhance the motor characteristics. CONSTITUTION:In the method and machine for producing a laminated core through side pressure caulking where core pieces 17 prepared through a predetermined profile machining are laminated sequentially by the side pressure of a squeeze member 18 arranged in a metal mold, waving irregularities 21 are formed on the inner peripheral face of the squeeze member 18 and then side pressure caulking is performed through the use of frictional resistance between the protrusions on the inner peripheral face and the core piece 17 subjected to profile machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a laminated iron core, and more specifically, to a side pressure portion of an iron core piece and a friction resistance of an inner peripheral surface of a squeeze member arranged in a mold.
The present invention relates to a method and an apparatus for manufacturing a laminated iron core, in which the iron core pieces are engaged with each other by caulking projections formed on the iron core pieces in advance by the downward pressure of the punch.

[0002]

2. Description of the Related Art FIG. 7 shows a laminated state of iron core pieces of a motor core (rotor) according to a conventional example. As shown in the figure, an iron core punched out from a lower portion of a die 61 paired with an upper punch 60. A receiving member 64 that receives the piece 62 and gradually descends by a predetermined length by a hydraulic cylinder 63 is arranged, and the iron core piece 62 punched by the punch 60 is gradually laminated and fixed on the receiving member 64. A motor core composed of a predetermined number of iron core pieces 62 is manufactured, and the carry-out cylinder 6
It was conveyed outside the press by No. 5. However, when the hydraulic cylinder 63 is provided, a control device for the hydraulic cylinder 63 is also required, the whole device becomes complicated and expensive, and the punching speed of the iron core piece is lowered due to the complicated operation.
A squeeze member having an inner shape slightly smaller than the outer shape of the punched iron core piece is arranged at the lower part of the core piece, and the iron core piece formed with the caulking projections is laminated and fixed by frictional resistance due to the lateral pressure. Further, as another conventional technique, there is a stator having a split structure described in Japanese Patent Application Laid-Open No. 53-4803 previously proposed and published by the present applicant.

[0003]

However, since the caulking method utilizing the lateral pressure of the squeeze member does not have an adjusting function, abnormal wear occurs on the iron core piece or the squeeze member, or the iron core piece and the squeeze member are not worn. There is a problem that seizure occurs due to heat generation due to frictional resistance between them. In addition, there is a problem that lateral deformation is generated around the iron core piece as a whole, so that the shape deformation occurs, and this shape deformation is remarkable in the split iron core yoke pieces. Further, since an internal strain is generated as a whole, which affects the magnetic properties, there has been a problem that a process such as annealing for removing internal stress is conventionally required. Further, there is a problem in that the lateral pressure increases due to the deformation of the end surface due to the abrasion of the punch and the die, and the die is damaged. The present invention has been made in view of the above circumstances, in which the iron core piece or the squeeze member is not damaged due to abnormal wear or seizure, and further, the residual stress applied to the iron core piece is significantly reduced, and the motor characteristics are improved. It is an object of the present invention to provide a method and an apparatus for manufacturing a laminated iron core, in which

[0004]

A method according to the above-mentioned object.
The method for manufacturing a laminated core described above is a method for manufacturing a laminated core by lateral pressure caulking, in which an iron core piece formed by performing a required shape processing is sequentially laminated and fixed by lateral pressure of a squeeze member arranged in a mold, The squeeze member is configured so that wavy unevenness is formed on the inner peripheral surface, and the side pressure caulking is performed by frictional resistance between the convex portion on the inner peripheral surface and the shaped core piece. The method for manufacturing a laminated core according to claim 2 is the method according to claim 1, wherein the wavy unevenness formed on the inner peripheral surface of the squeeze member has a pitch of 0.3.
.About.0.5 mm and the depth is in the range of 0.018 to 0.023 mm. And claim 3
The laminated iron core manufacturing apparatus described includes a pair of punches and punching dies, a required shape processing means for forming the shape of the core piece, and the core piece processed into a predetermined shape by the shape processing means, A squeeze member arranged in a mold is provided with a laminated core manufacturing apparatus having lateral pressure crimping means for sequentially stacking and fixing the squeeze member, and the wavy unevenness is formed on the inner peripheral surface of the squeeze member.

[0005]

In the method for manufacturing a laminated core according to claims 1 and 2, and the apparatus for manufacturing a laminated core according to claim 3, corrugated irregularities are formed on the inner peripheral surface of the squeeze member to form the core piece and the squeeze member. Since the side pressure caulking is performed by the frictional resistance with the convex portion formed on the inner peripheral surface, the stress applied to the convex portion can escape to the surrounding area, whereby the convex portion around the iron core piece can be released. Although a stress is partially generated in the portion that abuts on the core, the stress is not pressed as a whole, and as a result, the deterioration of the magnetic characteristics due to the residual stress caused by the pressing of the core piece from the entire periphery is eliminated. Then, the iron core piece comes into contact with the convex portions formed at a predetermined pitch and receives the side pressure from this portion, so that the side pressure is made uniform, and the heat generation of the iron piece or the squeeze member is significantly reduced, and seizure or Can prevent damage.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a partially enlarged view showing the relationship between an iron core piece and a squeeze member to which an embodiment of the present invention is applied, FIG. 2 is a work process diagram of the embodiment of the present invention, and FIGS. 3 to 5 are iron cores. FIG. 6 is a plan view of one piece, and FIG. 6 is a partially enlarged view of the assembled iron core.

FIG. 2 shows a manufacturing process of an iron core piece. After forming a pilot hole 11 in a strip 10 made of a silicon steel plate having a predetermined width, a hole 12 communicating with a stud for a stake is formed (step A ), The slot 13 of the rotor is punched (step B), and the caulking projection 14 is formed (step C). next,
The inner slot 15 of the stator is punched out (step D), the shaft hole 16 of the rotor is punched out (step E), and the rotor portion is punched out (step F), whereby the circumscribed circle becomes a right circle as shown in FIG. The rotor core piece 17 is manufactured.

The stamped rotor iron core piece 17 is sent to the squeeze member 18.
8 will be described in more detail with reference to the development view of FIG. 1, the pitch is 0.3 to 0.5 m on the inner peripheral surface of the squeeze member 18.
m, and the wavy unevenness 19 having a depth in the range of 0.018 to 0.023 mm is formed, and the wavy unevenness is formed outside the magnetic pole 20 of the punched right circular rotor core piece 17. The convex portion 21 of 19 is abutted by giving a constant lateral pressure margin 22. Thereby, a lateral pressure is applied around the iron core piece 17,
The rotor core pieces 17 pushed by the punches can be laminated and fixed by the formed caulking projections 14.

Although the side pressure margin 22 varies depending on the thickness, diameter, Young's modulus, etc. of the rotor core piece 17, it is preferably about 10 to 50% of the height of the uneven wave, whereby the stress generated by the side pressure is limited to the convex portion. Thus, it is possible to prevent deterioration of magnetic characteristics due to stress applied to the entire rotor core piece as in the conventional case. Also, by adjusting the side pressure allowance 22, it is naturally possible to adjust the side pressure applied to the rotor core piece 17 from the squeeze member 18. As a result, a predetermined number of rotor core pieces 17 are sequentially laminated and fixed via the caulking projections 14.

After the idle step G has passed, the inside of the magnetic pole core pieces 25 is punched out (step H), and two caulking projections 26 are formed on each magnetic pole core piece 25 (step I). After the step J, the magnetic pole core piece 25 is punched out (step K). As a result, eight magnetic pole core pieces 25 radially arranged as shown in FIG. 5 are formed. Both sides of the magnetic pole core pieces 25 are linearly punched by the punching die to form the side pressure portions 27. Is forming. And
It is sent to a squeeze member 28 arranged under the punching die having substantially the same shape as the magnetic pole core piece 25.

Regarding the shape of the squeeze member 28,
Referring to FIG. 1, the inner peripheral surface of the squeeze member 28 has a pitch of 0.3 to 0.5 mm and a depth of 0.018.
A corrugated unevenness 29 in the range of up to 0.023 mm is formed, and a side pressure is applied to the end surface of the linear side pressure portion 27 of the punched magnetic pole core piece 25 with a constant side pressure margin 30. Has become. As a result, like the rotor core piece 17, the squeeze member 28 or the magnetic pole core piece 25 is prevented from being damaged or seized. Through the above process, the magnetic pole core pieces 25 are laminated and fixed, and the magnetic pole core 32 forming the stator core 31 which is partially shown in FIG. 6 is manufactured.

Next, after passing through the idle step L, the inside of the yoke core piece 37 is pulled out (step M), a slit is formed inside (step N), and after the idle step O, the caulking projection 38 is formed. Form (process P). Then, the outside of the yoke core piece 37 is punched out (process R) to make a yoke core piece 37 as shown in FIG. 4, and the yoke core piece 37 is pushed into the lower squeeze member. Here, in the same manner as described above, wavy unevenness is formed on the squeeze member, and the convex portion generates a lateral pressure when the squeeze member is fitted into the squeeze member, so that the magnetic characteristics are not deteriorated. As shown in FIG. 6, the magnetic pole core 32 is fixed by laminating and fixing the yoke core pieces 37 so as not to cause seizure or damage between the core pieces 37.
The yoke core 39 arranged on the outer side of is manufactured.

The side pressure may be generated by forming wavy unevenness on the entire inner peripheral surface of the squeeze member for applying the side pressure to the yoke iron core piece or the like, or by partially forming the side pressure on the inner peripheral surface of the squeeze member. It is also possible to form wavy unevenness on the surface and partially generate lateral pressure. Further, the iron core piece is not limited to the motor core, but also includes a case where the iron core piece used for another electric machine is laminated to manufacture the iron core. Further, although the stator iron core of the above-mentioned embodiment has a divided structure, the present invention is naturally applied to the stator iron core integrally formed.

[0014]

According to the method for manufacturing a laminated core and the manufacturing apparatus for a laminated core according to claim 3,
Since wavy unevenness is formed on the inner peripheral surface of the squeeze member and side pressure caulking is performed by the side surface of the uniformly punched iron core piece, heat generation is significantly reduced, and the iron core piece or the squeeze member is not damaged or damaged. Very little seizure occurs. Further, since the stress applied to the iron core piece escapes to the side portion from the position where it is in contact with the convex portion of the squeeze member, the stress of the iron core piece is made uniform and the magnetic characteristics are not deteriorated. Therefore, it is possible to manufacture a core having good magnetic characteristics at a relatively low cost without performing a post-treatment such as annealing.

[Brief description of drawings]

FIG. 1 is a partially enlarged view showing a relationship between an iron core piece and a squeeze member to which an embodiment of the present invention is applied.

FIG. 2 is a work process diagram of an embodiment of the present invention.

FIG. 3 is a plan view of an iron core piece.

FIG. 4 is a plan view of an iron core piece.

FIG. 5 is a plan view of an iron core piece.

FIG. 6 is a partially enlarged view of the iron core.

FIG. 7 is a partial cross-sectional view of a conventional laminated core manufacturing apparatus.

[Explanation of symbols]

 10 strip material 11 pilot hole 12 hole 13 slot 14 caulking protrusion 15 inner slot 16 shaft hole 17 rotor core piece 18 squeeze member 19 unevenness 20 magnetic pole 21 convex portion 22 side pressure allowance 25 magnetic pole core piece 26 caulking protrusion 27 lateral pressure portion 28 squeeze Member 29 Unevenness 30 Side pressure margin 31 Stator iron core 32 Magnetic pole iron core 37 Yoke iron core piece 38 Caulking protrusion 39 Yoke iron core

Claims (3)

[Claims] 1. A method of manufacturing a laminated iron core by lateral pressure caulking in which iron core pieces formed by performing a required shape processing are sequentially laminated and fixed by lateral pressure of a squeeze member arranged in a mold. A method for manufacturing a laminated core, wherein wavy unevenness is formed on a peripheral surface, and the side pressure caulking is performed by frictional resistance between the convex portion of the inner peripheral surface and the shaped core piece. 2. The wavy unevenness formed on the inner peripheral surface of the squeeze member has a pitch of 0.3 to 0.5 mm and a depth of 0.018 to 0.023 mm. Manufacturing method of laminated core. 3. A pair of punches and punching dies are provided,
A required shape processing means for forming the shape of the iron core piece, and a side pressure caulking means for sequentially stacking and fixing the iron core piece processed into a predetermined shape by the shape processing means by a squeeze member arranged in a mold. In the manufacturing apparatus for a laminated core, the manufacturing apparatus for a laminated iron core is characterized in that wavy unevenness is formed on the inner peripheral surface of the squeeze member.