JPH0654488A - Manufacture of stator iron core - Google Patents

Abstract

PURPOSE:To eliminate external machining after calking and thereby to shorten a working time by removing the deviation on an external face of an inner core by pressing an external face of the inner core with the root of a gear, with the inner core set in a press for calking. CONSTITUTION:An inner core before it takes calking is mounted on a lower mandrel 5 and an inner diameter of the inner core is fit in with a guide section 51. Nextly, a press 6 is lowered down and a guide section 71 of an upper mandrel 7 is inserted into the inside of the inner core and the inner core is put between the lower mandrel 5 and the upper mandrel 7. Under this condition, a gear 8 is moved to the center of the inner core by means of an air cylinder 82 and an end of a magnetic pole section of the gear 8 is pushed-against the inner core and is pressed toward the center of the inner core and then the gear 8 is rotated. The magnetic pole sections are moved sequently by means of the teeth of the gear by rotating the gear 8 and an end of all the teeth of the gear 8 is pressed against the inner core and thereby the deviation on the entire outer surface of the inner core can be eliminated. By this method, no external machinery is necessary after calking and a working time can be shortened.

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 stator core of a rotary electric machine, and more particularly to a method of forming a stator core by crimping laminated thin steel plates to each other.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a stator core of a rotary electric machine has a ring-shaped outer core 1 and an inner peripheral side of a magnetic pole portion 2 radially arranged to fit the inner diameter of the outer core 1. In the case of the gear-shaped hollow inner core 3 connected with each other, the ring-shaped outer core piece 11 and the inner core piece 31 are separately punched from a thin steel plate by a press machine. Outer core piece 11 and inner core piece 3
1 is a protruding portion 1 for caulking that projects on one side.
2, 32 are provided, the protrusions 12, 32 are engaged with the recesses on the back side of the protrusions formed on the adjacent core pieces, and the outer core piece and the inner core piece are laminated by a predetermined number, respectively, Pressure is applied from both sides by pressing to crimp the protrusions to form the outer core and the inner core integrated in a block state. When the inner core and the outer core are punched out from the thin steel plate, there is a slight variation in the plate thickness depending on the rolling direction of the thin steel plate.

[0003]

However, since the inner core and the outer core are rotated by a predetermined angle when they are laminated, a gap may occur between adjacent core pieces as shown in FIG. However, because the inner core fits inside the outer core,
Further, in order to reduce the cogging torque, it is necessary that the outer diameter of the inner core and the inner diameter of the outer core are aligned so that there is no deviation. Since the outer core is ring-shaped, it is easy to match the outer diameter, but since the magnetic poles of the inner core are protruding radially, it is not easy to match the outer diameter, and after crimping the protrusions, There is a drawback in that the processing time and processing steps such as cutting the outer diameter of the inner core to maintain accuracy increase. An object of the present invention is to make the outer diameter of the inner core uniform during the caulking process of the protrusions and reduce the processing time.

[0004]

According to the present invention, an inner core piece made of a thin steel plate forming a hollow inner core having a gear shape in which radially arranged magnetic pole portions are connected to each other is projected on one surface. The protrusion for caulking and the recess on the back side of the protrusion formed on the inner core piece adjacent to the inner core piece are engaged, and the inner core is formed by laminating a predetermined number of the inner core pieces, By pressing both end surfaces of the inner core by pressing, by crimping the protruding portion to integrate the stator core in a block state, before pressing both end surfaces of the inner core by the press, At the same time as pressing both end surfaces of the inner core in a state of being laminated by engaging with the recesses via bearings, the outer periphery of the magnetic pole portion of the inner core is formed by the inner bottom portion between the teeth of the gear. Rotate the gear while pressing it toward the center of the core. It is obtained by way.

[0005]

Operation: The guide portion of the upper mandrel is inserted into the inner diameter of the inner core, and the inner core is sandwiched between the lower mandrel and the upper mandrel. In this state, the gear is moved toward the center of the inner yoke by the air cylinder, the magnetic pole of the inner core is sandwiched between the teeth of the gear, the valley bottom is pressed against the tip of the magnetic pole, and the gear is rotated. Then, the inner core pieces that have jumped out to the outer periphery of the inner core 3 are pressed and aligned, so that the deviation of the outer periphery of the inner core is eliminated over the entire periphery.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view, in which a lower mandrel 5 is rotatably supported on a top surface of a base 4 via a bearing 41. The lower mandrel 5 is provided with a guide portion 51 for positioning so that the center of the inner core 3 and the center of the bearing 41 coincide with each other. A press 6 capable of moving up and down is provided above the lower mandrel 5, and a guide portion 71 is provided on the lower surface of the press 6 via a bearing 61.
The upper mandrel 7 having the above is provided, and the center is aligned with the lower mandrel 5. Lower mandrel 5 and upper mandrel 7
A gear 8 is supported on a side of the inner core 3 sandwiched between the lower mandrel 5 and the upper mandrel 7 so as to be rotated and driven by a rotation device (not shown).
The gear 8 is pressed against the tip end surface of the magnetic pole of the inner core 3 by the air cylinder 82 via 1. The gear 8 is
It has the same outer diameter as the inner core 3 and the same number of teeth as the number of magnetic poles,
The diameter of the root circle is determined so that the width of the valley bottom portion 84 between the adjacent teeth 83 is larger than the width of the magnetic pole portion 2 in the circumferential direction. The axial length of the gear 8 is slightly longer than the length of the inner core 3 before the caulking process, and the escape portions 52, 72 are provided so that the teeth of the gear do not hit the lower mandrel 5 and the upper mandrel 7. Is provided. When the inner core 3 before crimping is crimped by the press 6, the press 6 is raised and the inner core 3 before crimping is placed on the lower mandrel 5.
The inner diameter of the inner core 3 is fitted into the guide portion 51. Next, the press 6 is lowered and the guide portion of the upper mandrel 7 is moved to the inner core 3
And insert the inner core 3 between the lower mandrel 5 and the upper mandrel 7. In this state, the air cylinder 82
The gear 8 is moved toward the center of the inner core 3 by the
Is sandwiched between the teeth 83 of the gear 8 and the valley bottom portion 84 is pressed against the tip of the magnetic pole portion 2 to press it toward the center of the inner core 3 and rotate the gear 8. Then, the inner core piece protruding to the outer periphery of the inner core 3 is pressed by the valley bottom portion 84 of the gear, and the tip surfaces of the magnetic pole portions 2 are aligned. By rotating the gear 8, the magnetic pole portions 2 are sent one after another by the teeth 83,
The tip surfaces of the teeth 83 on the entire circumference are pressed, and the deviation of the outer circumference of the inner core 3 is eliminated over the entire circumference. Next, the inner core 3 is pressed by the press 6 via the upper mandrel 7, and the protrusions are caulked. Therefore, since the deviation of the outer circumference of the inner core 3 is removed before the crimping operation, it is not necessary to perform the outer diameter cutting after the crimping for maintaining the accuracy.

[0007]

As described above, according to the present invention, in the state where the inner core is mounted on the crimping press, the outer peripheral surface of the inner core is pressed by the valley bottom portion of the gear to remove the deviation.
There is no need to perform outer diameter cutting after crimping, which has the effect of reducing the processing time.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a plan view of a stator core.

FIG. 4 is a side cross-sectional view of a conventional stator core during processing.

[Explanation of symbols]

 2 magnetic pole part 3 inner core 4 base 41 bearing 5 lower mandrel 51 guide part 6 press 61 bearing 7 upper mandrel 71 guide part 8 gear 81 support part 82 air cylinder 83 teeth 84 valley bottom part

Claims (1)

[Claims] 1. A caulking protrusion protruding from one surface of an inner core piece made of a thin steel plate forming a hollow inner core having a gear shape in which radially arranged magnetic poles are connected on the inner peripheral side, and The inner core piece is engaged with the recess on the back side of the protrusion formed on the inner core piece, the inner core pieces are laminated by a predetermined number to form the inner core, and both end surfaces of the inner core are pressed. In the method for manufacturing a stator core in which the protrusion is crimped and integrated into a block state by pressing, the projecting portion and the concave portion are engaged and laminated before pressing both end surfaces of the inner core by pressing. While pressing both end surfaces of the inner core in a state of being pressed by a bearing through the bearing, at the same time while pressing the outer periphery of the magnetic pole portion of the inner core toward the center of the inner core by the root portion between the teeth of the gear. Characterized by rotating the gear And a method for manufacturing a stator core.