JP3544114B2 - Manufacturing method of stepping motor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of manufacturing a stepping motor for punching and laminating an iron core piece from a metal strip, and particularly relates to a method of manufacturing a stepping motor for shaving between pole teeth or a circumferential surface of a pole tooth of the stepping motor.
[0002]
[Prior art]
Conventionally, a rotor and a stator of a stepping motor are manufactured by a method of punching and laminating an iron core piece from a metal strip by a press die, but in the conventional punching, a sagging or broken portion is formed on a processing surface. In the pole teeth of the rotor and stator core pieces, sagging and breaks are formed on the side and circumferential surfaces.
[0003]
If sagging or broken portions are formed on the side surfaces or circumferential surfaces of the pole teeth, the area of the circumferential surfaces of the rotor and the stator is reduced, and as a result, the characteristics of the motor are reduced.
[0004]
Therefore, a method using shaving processing when forming the side surface or the circumferential surface of the pole tooth portion has been proposed.
[0005]
[Problems to be solved by the invention]
In the shaving process, a pilot hole is punched out while leaving a shaving allowance, and then the shaving punching is performed. There has been a problem that a scrap is generated and a scrap rises.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in the manufacture of a rotor or a stator of a stepping motor, even if shaving is performed on the side surface or the circumferential surface of the pole teeth portion, the problem of scrap rising occurs. The object of the present invention is to provide a method for manufacturing a stepping motor.
[0007]
[Means for Solving the Problems]
A feature of the present invention is a method for manufacturing a stepping motor in which an iron core piece is punched out of a metal strip and laminated, and the pre-drilling is performed while leaving a shaving allowance between the pole teeth or on the circumference of the pole teeth of the stepping motor. After performing the shaving process, shaving is performed so as to include a region near the outer periphery of the prepared hole-piercing region, and lamination is performed.
[0008]
In particular, the present invention resides in performing shaving removal after preparing a preliminary hole by dividing a space between the pole teeth portions or the circumferential surface of the pole tooth portions into a plurality of punching regions.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0011]
The method for manufacturing a stepping motor according to the present invention is a method for manufacturing a stepping motor in which an iron core piece of a rotor or a stator is punched from a metal strip and laminated, wherein shaving is performed between pole teeth or on a circumferential surface of the pole teeth of the stepping motor. This is a method for manufacturing a stepping motor in which after preparing a hole while leaving a margin, performing shaving removal so as to include a region near the outer periphery of the prepared hole region and laminating.
[0012]
According to the above-described manufacturing method, the scrap generated during shaving removal becomes ring-shaped and comes into contact with the outer peripheral surface of the die of the punching die, so that the problem of scrap rising can be prevented.
[0013]
In another embodiment, the hole between the pole teeth or the circumferential surface of the pole tooth is divided into a plurality of punched regions, and the holes are punched. Is performed, the shape of the scrap generated during shaving removal does not become elongated, so that it is possible to particularly prevent the scrap from rising.
[0015]
Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
In the present embodiment, an example will be described in which press working using a progressive die is performed, and shaving processing is used for punching between pole teeth for forming side surfaces of rotor pole teeth of a stepping motor.
[0017]
A pilot hole and a shaft hole are punched out of the metal strip, and then a pilot hole is punched out while leaving a shaving allowance between the rotor pole teeth.
[0018]
FIG. 1 is a view showing a part of a punching step of forming a rotor. As shown in FIG. 1A, a hatched portion including a region between pole teeth portions 1 is a pilot hole punching region 2.
[0019]
In the figure, a dotted line indicates the rotor region 3.
[0020]
Next, as shown in FIG. 1B, shaving punching is performed by punching out a shaving region 4 including a region near the outer periphery of the pilot hole punching region 2 to form a side surface of the pole teeth portion 1 of the rotor.
[0021]
Next, as shown in FIG. 1C, the rotor region 3 is punched out so as to cut the circumferential surface 5 of the pole tooth portion 1 and laminated to manufacture a rotor.
[0022]
Embodiment 2
In this embodiment, an example will be described in which press working using a progressive die is performed, and shaving processing is used for punching a circumferential surface of a rotor pole tooth portion of a stepping motor.
[0023]
A pilot hole and a shaft hole are punched out of the metal strip material, and then a pilot hole is punched while leaving a shaving allowance in the vicinity of the circumferential surface of each pole tooth portion.
[0024]
FIG. 2 is a view showing a part of a rotor punching process. As shown in FIG. 2A, a region where a region serving as a shaving allowance is separated from a region of the circumferential surface 11 of the pole teeth portion 10 is a pilot hole punching process. Region 12.
[0025]
In the figure, the dotted line indicates the rotor region 13.
[0026]
Next, as shown in FIG. 2B, shaving punching is performed by punching out a shaving region 14 including a region near the outer periphery of the pilot hole punching region 12, thereby forming a circumferential surface 11 of the pole teeth portion 10 of the rotor.
[0027]
Next, as shown in FIG. 2C, the rotor regions 13 are punched out and laminated so as to cut between the pole teeth portions 10 including the side surfaces of the pole tooth portions 10, thereby manufacturing a rotor.
[0028]
Embodiment 3
In this embodiment, an example will be described in which press working using a progressive die is performed, and shaving processing is used to punch out the circumferential surface of the pole teeth of the stator of the stepping motor.
[0029]
Pilot holes and other portions are punched out of the metal strip, and then, pilot holes are punched out while leaving a shaving allowance near the circumference of each pole tooth portion.
[0030]
FIG. 3 is a view showing a part of a step of punching the stator. As shown in FIG. 3A, a region where a region serving as a shaving allowance is separated from a region of the circumferential surface 21 of the pole teeth portion 20 is a pilot hole. This is a blank area 22.
[0031]
In the figure, the dotted line indicates the stator region 23.
[0032]
Next, as shown in FIG. 3B, shaving is performed by punching out a shaving region 24 including a region near the outer periphery of the pilot hole region 22 to form a circumferential surface 21 of the pole teeth portion 20 in the stator.
[0033]
Next, as shown in FIG. 3C, a gap 25 between the pole teeth including the side surface of the pole tooth 20 is punched.
[0034]
Next, other punching such as a yoke portion is performed, and the stator region 23 is punched and laminated to manufacture a stator.
[0035]
In this embodiment, an example of shaving between the pole teeth of the stator is not shown. However, similar to the shaving between the rotor pole teeth shown in the first embodiment, the shaving between the pole teeth is performed. The portion may be formed by ordinary punching and laminated.
[0036]
【The invention's effect】
According to the above-described method for manufacturing a stepping motor of the present invention, the scrap generated during shaving removal becomes ring-shaped and comes into contact with the outer peripheral surface of the die of the punching die, so that the problem of scrap rising can be prevented.
[0037]
Further, according to the method of performing shaving removal so as to include a region near the outer periphery of the prepared hole punching region after performing the prepared hole punching between the pole tooth portions or the circumferential surface of the polar tooth portion divided into a plurality of punched regions. Since the shape of the scraps generated during shaving removal does not become elongated, it is possible to particularly prevent the scraps from rising.
[Brief description of the drawings]
FIG. 1 is a view showing a part of a punching step according to an embodiment of the present invention.
FIG. 2 is a view showing a part of a punching step according to the embodiment of the present invention.
FIG. 3 is a diagram showing a part of a punching step according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pole tooth part 2 Drilling area 3 Rotor area 4 Shaving area 5 Circular surface 10 Pole tooth part 11 Circular surface 12 Drilling area 13 Rotor area 14 Shaving area 20 Pole tooth part 21 Circumferential surface 22 Drilling hole Area 23 Stator area 24 Shaving area 25 Between pole teeth

Claims (2)

A method of manufacturing a stepping motor for punching and laminating an iron core piece from a metal strip,
Between the pole teeth of the stepping motor or on the circumferential surface of the pole teeth, after performing pre-drilling leaving a shaving allowance, performing shaving processing to remove the shaving so as to include the area near the outer periphery of the prepared hole area, A method for manufacturing a stepping motor, comprising laminating. The method for manufacturing a stepping motor according to claim 1, wherein shaving is performed after preparing a pre-drilled hole by dividing a space between the pole teeth or a circumferential surface of the pole tooth into a plurality of punching regions.

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