JP2727051B2 - Manufacturing method of iron plate for laminated iron core - Google Patents

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 an iron plate for a laminated iron core having small teeth on the periphery used in an electric motor, particularly a stepping motor.

[0002]

2. Description of the Related Art An iron plate for a laminated iron core of an electric motor is usually manufactured continuously by a progressive die or the like.

FIG. 6 shows a method of manufacturing a conventional iron plate for a laminated iron core. In this method, in a stage I, a tooth bottom 2a and a tooth side surface 2b of the small teeth 2 of the laminated iron core iron plate shown in FIG. After punching out the insertion hole 3 and the rivet hole 4, the stage III
, Punched iron plate with a circular punch,
Is formed.

In another conventional method for manufacturing a laminated iron core iron plate shown in FIG. 8, a shaft insertion hole 3 and a rivet hole 4 are punched out of an iron plate material 1, and then small teeth are formed by a spline punching die. 2 are formed.

[0005] The iron plates for a laminated iron core manufactured in this manner are laminated, assembled together with a magnet and the like on a rotary shaft to form a rotor body. The outer periphery of the rotor body is ground. At that time, the generated burrs are removed by a brush in a deburring step. At that time, iron powder remains, but the iron powder is washed away in the washing step. However, since the iron powder that has entered between the iron plates cannot be easily washed away, a hardener such as million is applied to the peripheral surface to form a curtain on the outer peripheral surface of the rotor. Contain it.

[0006]

Incidentally, the small teeth 2 of the iron plate for a laminated iron core formed by the former method have a tooth tip 2
An edge (corner corner) 2d between the c and the tooth side surface 2b becomes an edge. As described above, when the meeting portion 2d is an edge, when the rotor body is later ground, burrs are easily generated there. When burrs are generated, the burrs may enter between the iron plates in the next deburring step.

In addition, the small teeth 2 of the iron plate for a laminated iron core formed by the latter method are formed by punching the entire teeth at one time, so that the peripheral edge of the small teeth 2 sags. When laminating iron plates, a gap is formed between the iron plates, and there is a risk that burrs or the like due to grinding may enter the gap.

Accordingly, an object of the present invention is to provide a method of manufacturing a laminated iron core iron plate which does not cause burrs or sagging.

[0009]

According to the present invention, there is provided a method of manufacturing an iron plate for a laminated iron core according to the present invention .
Tooth side surface 11a and tooth bottom 11b of small teeth 11 provided on the outer peripheral edge
The plate-shaped material 1 is formed by using a slit punch having a substantially elliptical punch for forming
0 substantially oval hole 14 punching out and arranged in a circle, then the spline trimming die between these substantially oval hole 14 2
Using a spline punching die 20 whose peripheral surface is formed in a spline shape so as to correspond to the peak 20c of 0, and whose mountain-shaped corner portion 20a is formed in an R, the space between the substantially elliptical holes 14 is punched.
And thereby, on the outer peripheral edge of the iron plate 15 for a laminated iron core,
The small teeth 11 whose corners 11d are R are formed.

In the method for manufacturing a laminated iron core iron plate according to a second aspect of the present invention, a small iron core iron plate is provided on the outer peripheral edge of the laminated iron core iron plate.
Tooth side surface 11a, tooth bottom 11b and tip corner 11d of tooth 11
The neck part 21a of the T-shaped punch for forming the R is formed in the R
Then , a T-shaped hole 2 is formed in the plate material 10 by using a slit punching die 21 in which the T-shaped punches are arranged at equal intervals and in an annular shape.
2 punching out and arranged in a ring, then the addendum of teeth 11
Round punching is performed with a circular punch forming 11c , and the corner 11d is rounded to the outer peripheral edge of the iron plate 15 for a laminated iron core.
A certain small tooth 11 is formed.

[0011]

According to the method of manufacturing the iron plate for a laminated iron core of the present invention, since the small teeth are formed in two steps, the cutting line is short, so that the sag is small, and the corner of the tooth tip can be formed at any one of the corners. Since burrs are formed in step R, the generation of burrs during grinding can be reduced.

[0012]

FIG. 1 shows a first embodiment of a method of manufacturing an iron plate for a laminated iron core according to the present invention.

In this method, in the first stage I, slits are cut out, and substantially elliptical holes 14 arranged annularly at regular intervals in the material 10 are punched out. The straight portion 10a and the center side curved portion 10b of the contour wall defining the substantially elliptical hole 14 are
The tooth side surface 11a and the tooth bottom 11b of the small tooth 11 in the laminated iron core iron plate 15 shown in FIG. 3 are formed.

Next, in the second stage II, the shaft insertion hole 12 and the rivet hole 13 are punched.

Next, in a third stage III, spline cutting is performed by a spline cutting die 20 as shown in FIG. In this spline punching die 20, the peak 20c is the first
Corresponds between the substantially oval holes 14 punched on the stage
The peripheral surface is formed in a spline shape like this,
The angle 20a is rounded (R) . And this spline punching die 20 has its chevron top 20
In b, a tooth tip 11c of the small tooth 11 of the iron plate for a laminated iron core is formed.

In the iron plate 15 for a laminated iron core manufactured according to the above embodiment, the small teeth 11 are formed in two steps, and the corners 11d of the tooth tips 11c can be formed in the round shape. Therefore, burrs and sagging hardly occur.

FIG. 4 shows a second embodiment of the method for manufacturing the iron plate for a laminated iron core according to the present invention.

In this method, in the first stage I, a slit punching die 21 in which T-shaped punches are annularly arranged at equal intervals is adopted, and the slit punching die 21 is annularly formed at equal intervals on the material 10. The arranged T-shaped hole 22 is punched out.
This slit punch type punch has a T shape as shown in FIG.
The T-shaped neck portion 21a is R-shaped. As shown in FIG. 3, when the slit cutting die 21 becomes a product, the tooth side surface 11a of the small tooth 11 and the corner 11d of the tooth tip are formed.
And the tooth bottom 11b.

Next, in the second stage II, the shaft insertion holes 3
And rivet holes 4 are punched out.

Next, in a third stage III, the blank 10 is punched into a circular shape by a round punching die to obtain an iron plate 15 for a laminated iron core. As shown in FIG. 3, this round punching die forms the tooth tip 11c of the iron plate 15 for a laminated iron core.

Also in the iron plate 15 for a laminated iron core manufactured by the above embodiment, the small teeth 11 are formed in two steps, and the corners 11d of the tooth tips 11c can be formed in the round shape. Therefore, burrs and sagging hardly occur.

[0022]

As described above, according to the method for manufacturing a laminated iron core iron plate according to the present invention, the small teeth 11 of the laminated iron core iron plate are manufactured.
Is punched by two processes, so the punching load is low.
Noise can be reduced due to the
It is possible to extend the life of the blanking dies 20, 21
Wear. Also, a spline punching die 20 and a slit punching die
Punching load on 21 is lower than punching by one process
To lower, it is possible to suppress the occurrence of sagging, iron plate is closely case of laminating the laminated iron core iron plate.

Also, small teeth provided on the outer periphery of the iron plate for a laminated iron core
Since the corner 11d of 11 is formed in R, the small teeth 11d
Almost no burrs are generated, and when the iron plates for a laminated iron core are laminated, there is no possibility that burrs will enter between the iron plates, so that there is no need to apply a hardening agent for sealing the burrs between the iron plates.

[Brief description of the drawings]

FIG. 1 is a first diagram illustrating a method for producing a steel sheet for a laminated iron core according to the present invention.
It is a figure showing an example.

FIG. 2 is a sectional view showing a spline punching die employed in the manufacturing method of the first embodiment.

FIG. 3 is a plan view showing a portion of the iron plate for a laminated iron core obtained by the method of manufacturing an iron plate for a laminated iron core according to the present invention.

FIG. 4 shows a second method of manufacturing the iron plate for a laminated iron core according to the present invention.
It is a figure showing an example.

FIG. 5 is a sectional view showing a spline punching die employed in the manufacturing method of the second embodiment.

FIG. 6 is a view showing a method of manufacturing a conventional iron plate for a laminated iron core.

FIG. 7 is a plan view showing a part of the laminated iron core iron plate obtained by the conventional method of manufacturing a laminated iron core iron plate.

FIG. 8 is a view showing another method of manufacturing a conventional iron plate for a laminated iron core.

[Explanation of symbols]

Reference Signs List 10 iron plate material 11 small teeth 11a tooth side surface 11b tooth bottom 11c tooth tip 11d corner 12 shaft insertion hole 13 rivet hole 14 substantially elliptical hole 15 laminated iron core iron plate 20 spline punching die 20a angled corner 20c spline punching die Mountain 21 Slitting die 21a T-shaped neck 22 T-shaped hole

Claims (2)

(57) [Claims] 1. A small iron plate provided on an outer peripheral edge of a laminated iron core iron plate.
The punch having a substantially elliptical for forming a tooth side 11a and the tooth bottom 11b of the teeth 11, equally spaced at and using a slit cutting die arranged in an annular, substantially elliptical holes 1 a plate-shaped material 10
4 punching out and arranged in a ring, then the peripheral surface as mountain 20c spline cutting die 20 corresponding form to the splined between these substantially oval hole 14, and a chevron corners 20a R spline cutting die 20 formed on using,
A punch is made between the substantially elliptical holes 14 so that the product
A method for manufacturing a laminated iron core iron plate, comprising forming small teeth 11 whose corners 11d are R on the outer peripheral edge of the layered iron core iron plate 15 . 2. A small iron plate provided on the outer peripheral edge of the iron plate for a laminated iron core.
Tooth side surface 11a, tooth bottom 11b and tip corner 11d of tooth 11
The neck part 21a of the T-shaped punch for forming the R is formed in the R
Then , a T-shaped hole 2 is formed in the plate material 10 by using a slit punching die 21 in which the T-shaped punches are arranged at equal intervals and in an annular shape.
2 punching out and arranged in a ring, then the addendum of teeth 11
Round punching is performed with a circular punch forming 11c , and the corner 11d is rounded to the outer peripheral edge of the iron plate 15 for a laminated iron core.
A method for manufacturing an iron plate for a laminated iron core, wherein a certain small tooth 11 is formed.