JPS6142242A - Machining method of stator for stepping motor - Google Patents

Abstract

PURPOSE:To enhance the product accuracy of a punch and to improve the durability of the cutting edge of the punch by forming the profile lines of tongue pieces at every other pieces when punching many pieces at a stator, and forming and punching the profile lines of the pieces therebetween. CONSTITUTION:When many tongue pieces 3 are punched and formed at the center of a material 1 to form the stator for a stepping motor, first slit machining for forming slits 4a by a punch to become a profile line at every other pieces 3 is executed. Then, second slit machining for forming slits 4b to become the profile line of the pieces 3 disposed therebetween by the punch, thereby punching the center by continuing the slits 4a, 4b. Thus, since the thickness of the punch can be increased even when fine pieces 3 are formed, the product accuracy of the punch can be improved, and the durability of the cutting edge of the punch can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a stator for a stepping motor in which a large number of tongues are arranged in a radial manner.

<Conventional technology> When manufacturing a nutator for a stepping motor, the fifth
At the center position of material a, which has a circular shape as shown in Figure A, the fifth
As shown in Figure B, after punching and forming the reference holes A and B, a large number of punch holes C and C are punched in the material A (see Figure 5 C),
After that, as shown in the fifth diagram, a large number of tongue pieces d, d become teeth.
It was punched and formed by distributing it evenly. Then, the tongue pieces d and d formed by this punching are bent in the thickness direction of the material a as shown in Fig. 5E to form the south part, and then trimmed as shown in Fig. 5F. was going on.

In addition, the method for which a patent application has been applied is JP-A-58-8EIO.
There is a publication No. 54. This method involved putting a diaphragm in the center of the product, and then extracting the rows of teeth radially in the subsequent process.

<Problems to be Solved by the Invention> When a large number of tongues d, d are punched and formed as they are as in the prior art shown in FIG. 5, for example, as shown in FIG. It is necessary to construct a set of punches by radially combining a large number of punches e, e corresponding to the size of the gap between them. Therefore, as the number of tongue pieces d, d increases and the distance between their tips becomes smaller, it is necessary to reduce the thickness of the neck parts f, f of the individual punches e, e. In addition, a large number of tongues d, d are installed in a limited space as in the case of a stator of a stepping motor.
If there is a need to punch and form the punches e, e
It may be necessary to make the thickness of the neck parts f and f a fraction of the thickness of the material A, which will result in poor product accuracy and the blade durability of the punches e and e. There were some problems.

In addition, the technique disclosed in Japanese Patent Application Laid-Open No. 58-88054 makes it possible to increase the punch width, but when the aperture is inserted, it takes time to find the dimensions to be punched radially, and it has to be found by trial. In addition, when a product is drawn, the material inevitably becomes thinner, resulting in a reduction in product precision.

<Means for Solving the Problems> The purpose of the present invention is to improve the product accuracy by substantially increasing the thickness of the punch, and to process a stator for a stepping motor that can improve the blade durability of the punch. The purpose is to provide a method.

The present invention includes a step of punching and forming a stator for a stamping motor in which a large number of tongues are arranged radially. A first slit processing step of carving a first slit in the material that will become the outline of the piece, and a second slit that will become the outline of the other tongue of the pair of tongues, are performed in the W41.
By dividing the process into a second slit processing step in which the slits are continuously carved, it is possible to perform press processing using a punch having a thickness sufficiently larger than the punching gap between adjacent tongue pieces.

<Example> Fig. 1 is a process diagram of the processing method according to the present invention, in which a circular material 1 is punched and formed (Fig. 1A), and a reference hole is provided at a predetermined position of the material 1. , 2 (Fig. 1B), and two adjacent tongue pieces 3.3 are set as a set, along the outline of one of the tongue pieces 3, 3 of the set of tongue pieces. The first slits 4a, 4a are carved into the material 1 as a first slit processing step (FIG. 1C).

Next, the punch and the material 1 are rotated relative to each other by the equal angle of the tongue pieces 3, 3, and second slits 4b, 4b are formed along the outline of the remaining tongue pieces 3, 3 as a second slitting process. (Fig. 1D). In addition, at the time of the second slitting process, the slit due to this process) 4b, 4b
The end of the slit 4a formed in the first step is
, 1st and 2nd time by continuing to the end of 4a.
The radial spaces closed in the second process are extracted from the material 1.

Next, after bending the tongue pieces 3, 3 (1st AF)
, Trimming is performed to adjust the overall external shape, and all molding processes are completed (first AF).

Further, for the first and second steps as described above, a punch as shown in FIGS. 2 and 3 is used.

In Fig. 2, the hatched part shows one single punch 5, 5, and a set of punch units is constructed by combining a plurality of punches 5, 5 radially. .

Also, blades 6, 6 are provided on the side edge portion of the single punch 5.5 shown by the thick solid line, and the blades 6 of the adjacent single punch 5.5 are provided.
, 6 are made continuous with each other to form a slit along the outline of one of the two adjacent tongue pieces 3, 3) 4a, 4a or 4b.

4b can be engraved. By providing a relief 7 on the outer peripheral edge of the punch unit 5.5 as shown in FIG. 3, slits are not formed in the portions corresponding to the bases of the tongues 3, 3.

The slit punched with the punch unit in Figure 2 is shown in Figure 4A (
This is the same as Figure 1 C), 12 tongue pieces 3,
Six tongues 3.3, every other one of the tongues 3.3, are formed in the first punching process. Then, when another punch unit, which has the same structure as the punch unit in Figure 2 but is shifted in phase by 30 degrees, is punched into the material already punched in Figure 4 A (Figure 1 C) as a second process. Twelve tongues 3, 3 are formed as shown in FIG. 4B (this is the same as the first diagram) in which the same tongue shape as in FIG. 4A is formed at a position shifted by 30°.

In this way, if every other tongue of the plurality of tongues is punched and formed first, and then the remaining tongues are punched and formed, the shape of the single punch 5.5 can be made uniform. The shape can be formed by combining the two tongue pieces 3 and the gaps located on both sides of the tongue pieces 3, and thereby the thickness of the punch units 5, 5 can be increased.

In the above embodiment, a punch is constructed by combining a plurality of punch units, but the specific structure of the punch is not limited to the embodiment and may vary depending on the shape of the stepping motor stator to be manufactured. It may be designed as appropriate.

<Effects of the Invention> According to the present invention, a number of tongues arranged radially are made into a set of two adjacent tongues, and the outline of one of the tongues of the set is After cutting a first slit that corresponds to the outline of the other tongue of the set of tongues in the first processing step, a second slit that corresponds to the outline of the other tongue of the set of tongues is carved in the second processing step. Since the stator for the stepping motor is punched and formed by continuously carving the slits, even if the width of the gap between adjacent tongue pieces is extremely small, the thickness of the punch can be adjusted to the width of the gap. It can be made much larger.

For this reason, even if the size of the gap between adjacent tongue pieces is smaller than the thickness of the material, the thickness of the punch itself can be made larger than the thickness of the material, improving the accuracy of the product. At the same time, the durability of the punch blade can be improved.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing the working process of the present invention, Fig. 2 is a plan view of the punch used in the present invention, Fig. 3 is a view taken in the direction of arrow m in Fig. 2, and Fig. 4 is a slit punch of the present invention. Indicates punching, A is 1
B represents the second machining. Figure 5 is a process diagram showing an example of the conventional method! Figure @6 is a plan view of a punch used in the conventional method. 1... Material 3... Tongue pieces 4a, 4b
...Slit Patent Applicant: AIDA Engineering Co., Ltd. Agent Patent Attorney Nakayama
Figure 1 D E F Figure 5 D E F Figure 2 Figure 6 Figure 4 A Figure 4 B

Claims (1)

[Claims] A method of punching and forming a stator for a stepping motor in which a large number of tongues are arranged in a radial manner, in which two adjacent tongues are made into a set, and one of the tongues in the set is formed by stamping. A first slit processing step of carving a first slit that will become the outline line in the material, and a second slit that will become the outline line of the other tongue piece of the set of tongue pieces in the first slit. A method for processing a stator for a stepping motor, characterized in that the stator for a stepping motor is punched and formed by a second slit processing step in which slits are continuously formed.