JP2010094716A - Method of manufacturing ring stator of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a ring stator having uniform and thin thickness accurately by drawing. <P>SOLUTION: In a method of manufacturing the ring stator 1 of a motor, which is provided with a ring-shaped stator body portion 2 and a mounting flange 3 formed on the opening edge on one side of the stator body portion 2, the drawing is applied to a disk-shaped blank 11 while performing vibrational hammering at slow pressing speed by using a servo press and a cylindrical barrel part 14 is uniformly drawn so as to be thinner than the thickness of the blank. By further applying the drawing to this cylindrical barrel part 14 by using the servo press, the thickness t1 is uniformized. The cylindrical barrel part 14 formed by the drawing is positively thinned than the thickness of the blank. In this way, the cylindrical barrel part where the thickness is uniformed with extremely high accuracy is formed by the drawing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a manufacturing method capable of accurately manufacturing a ring stator of a motor with a uniform thickness by pressing.

  A method of manufacturing a metal part such as a motor housing by drawing a metal flat plate into a bottomed cylindrical shape is known. Patent Documents 1 and 2 disclose such a method. As disclosed in Patent Document 1, when a bottomed cylindrical part is formed by a general drawing process, tensile stress is applied to the cylinder part during the process, compared to the thickness of the metal plate blank before the process. The wall thickness of the cylindrical part after processing is reduced. Conventionally, various measures have been taken so that the thickness of the cylindrical portion is not reduced by drawing.

JP 2000-5827 A JP 2005-186136 A

  The present inventors tried various methods that have been proposed in the past in order to accurately manufacture the ring stator of the motor by drawing. However, in either method, it is difficult to accurately process a ring stator having a uniform thin thickness.

  An object of the present invention is to propose a method capable of accurately manufacturing a ring stator having a uniform thin thickness by drawing.

The present invention is a method for manufacturing a ring stator of a motor comprising a ring-shaped stator body portion and a mounting flange formed on one opening edge of the stator body portion,
Prepare a disk-shaped blank of thickness t made of a metal material,
Using a servo press, the disk-shaped blank is subjected to drawing while being vibrated at a predetermined pressing speed, and the disk-shaped bottom plate portion having a thickness t and the thickness extending in the orthogonal direction from the outer peripheral edge of the disk-shaped bottom plate portion. forming a cup-shaped part having a cylindrical body of t1 (<t) and an annular flange having a thickness t extending in an orthogonal direction outward from the opening edge of the cylindrical body;
Using a servo press, the cylindrical body is drawn to achieve a uniform thickness t1,
Press the annular flange to make the annular flange uniform and flattened,
Press the disk-shaped bottom plate part, and make a pilot hole that is slightly smaller than the disk-shaped bottom plate part.
Drawing the inner peripheral portion of the formed pilot hole and spreading the inner peripheral portion so as to have the same diameter as the cylindrical body,
The cylindrical body after the inner peripheral edge portion is expanded is subjected to a drawing process to make the wall thickness t1 uniform, thereby forming the stator body portion,
The mounting flange is formed by punching the annular flange.

  Conventionally, in drawing processing, various devices have been made in order to avoid that the thickness of the cylindrical portion formed by drawing processing becomes thinner than the thickness of the blank. The inventors of the present invention performed the drawing of the ring stator under the idea opposite to the conventional idea that the thickness of the cylindrical portion formed by drawing is actively reduced relative to the thickness of the blank. It was. By adopting a servo press and drawing the blank by vibration punching at a much slower pressing speed than before, the thickness of the cylindrical part is thinner than the blank and evenly uniform. It was found that it can be molded with high accuracy. The present invention is a method obtained based on the idea opposite to the conventional one, and according to the manufacturing method of the present invention, an excellent thin ring stator with uniform thickness can be manufactured with high accuracy by drawing. An effect is obtained.

  Embodiments of a method for manufacturing a motor ring stator to which the present invention is applied will be described below with reference to the drawings.

  1 and 2 are explanatory views showing a manufacturing process of a ring stator of a motor. First, as shown in FIG. 2 (d), a ring stator 1 of a motor includes a ring-shaped stator body portion 2 and a mounting flange 3 formed on one opening edge 2a of the stator body portion 2. The mounting flange 3 is formed with a bolt hole 3a for mounting.

  In order to manufacture the ring stator 1 having this shape by drawing, a disk-shaped blank 11 having a constant thickness t made of a metal flat plate is prepared as shown in FIG. For example, a disk-shaped blank 11 having a wall thickness t of 2 mm and an outer diameter of 318 mm is prepared.

  As shown in FIG. 1B, the cup-shaped part 12 is formed by subjecting the disk-shaped blank 11 to a drawing process while being vibrated by a servo press at a predetermined pressing speed. The cup-shaped part 12 includes a disc-shaped bottom plate portion 13 having a thickness t, a cylindrical barrel portion 14 having a thickness t1 (<t) extending in an orthogonal direction from the outer peripheral edge of the disc-shaped bottom plate portion 13, and a cylindrical barrel. The shape is provided with an annular flange 15 having a thickness t that spreads in an orthogonal direction outward from the opening edge of the portion 14. Further, the space between the disk-shaped bottom plate portion 13 and the cylindrical body portion 14 is continuous at a predetermined radius, and the space between the cylindrical body portion 14 and the annular flange 15 is also continued at a predetermined radius.

  For example, the cylindrical body 14 having a depth of about 52 mm is drawn by reducing the thickness t1 of the cylindrical body 14 by applying a slow pressing speed, for example, 5 to 6 seconds so as to be 1.66 mm thinner than the blank thickness 2 mm. Mold. The inner diameter of the cylindrical body 14 is, for example, about 205 mm, and the outer diameter of the annular flange 15 is, for example, about 260 mm. By appropriately setting the speed of the servo press, the drawing form, the size of the radius, etc., the cylindrical body portion 14 can be made thinner than the blank thickness and can be narrowed down evenly. A cylindrical body 14 having a uniform thickness t1 is obtained.

  Next, as shown in FIG. 1 (c), the cylindrical body 14 is drawn by a servo press to uniformly squeeze the cylindrical body 14 so that the thickness t1 is made uniform. Thereafter, as shown in FIG. 1 (d), the annular flange 15 is pressed to make the annular flange 15 uniform in thickness and flattened.

  Thereafter, as shown in FIG. 2A, the disk-shaped bottom plate portion 13 is pressed to form a pilot hole 13 a that is slightly smaller than the disk-shaped bottom plate portion 13. For example, a pilot hole 13a having an inner diameter of about 186 mm is formed. As shown in FIG. 2B, the cup-shaped component 12 </ b> A with a prepared hole obtained by this has the inner peripheral edge portion 13 b of the prepared hole 13 a remaining at the lower end edge of the cylindrical body portion 14.

  Next, as shown in FIG. 2 (b), the inner peripheral edge portion 13 b is subjected to a drawing process, and the inner peripheral edge portion 13 b is expanded so as to have the same diameter as the cylindrical body portion 14. As shown in FIG. 2 (c), the cylindrical portion 12B with flange obtained by expanding the inner peripheral edge portion 13b is subjected to drawing processing to make the thickness t1 uniform. . Thereby, the stator main-body part 2 is obtained.

  Here, in order to make the thickness of the cylindrical body portion 14 uniform and thin with high accuracy, the punch to be used is constantly applied with a constant pressure on the inner peripheral surface of the cylindrical body portion 14. The tip shape is set. For example, as shown in FIG. 3, the tip of the punch 20 has a cylindrical shape as a whole, but the tip is a small-diameter circular end surface 21, and the outer diameter gradually decreases from the circular end surface 21 toward the rear side. A first tapered outer peripheral surface portion 22 is formed, and the second taper has a gradually increasing outer diameter dimension toward the rear side continuously from the rear end portion of the first tapered outer peripheral surface portion 22. The outer peripheral surface portion 23 is continuous, and a circular outer peripheral surface portion 25 having a slightly smaller diameter than the second tapered outer peripheral surface portion 23 is connected to the rear end via a constricted portion 24.

  As described above, the punch 20 has the maximum outer diameter portion 23a at the rear end portion of the second tapered outer peripheral surface portion 23. For example, the radius of the maximum outer diameter portion 23a is the circular outer peripheral surface portion 25 on the rear side. It is 0.05 mm larger than the radius. Accordingly, the cylindrical body 14 is drawn while pressurizing the inner peripheral surface of the cylindrical body 14 with only the maximum outer diameter portion 23a in a line contact or surface contact state. As a result, a constant pressure is constantly applied to each portion of the inner peripheral surface of the cylindrical body portion 14, and the thickness of the portion can be reduced uniformly and with high accuracy.

  Finally, as shown in FIG. 2 (d), the annular flange 15 is stamped out to have a predetermined contour shape and subjected to hole punching, whereby the mounting flange 3 is obtained. Thereby, the ring stator 1 is obtained.

It is explanatory drawing which shows the first half part of the manufacturing process of the ring stator to which this invention is applied. It is explanatory drawing which shows the latter half part of the manufacturing process of the ring stator to which this invention is applied. It is sectional drawing and the partial expanded sectional view which show the shape of the punch used for the drawing process of a ring stator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring stator 2 Stator main-body part 3 Mounting flange 3a Bolt hole 11 Disc-shaped blank 12 Cup-shaped part 12B Cylindrical part 13 with a flange 13 Disc-shaped bottom-plate part 13a Lower hole 13b Inner peripheral part 14 of a lower hole Cylindrical trunk | drum 14A Cylindrical part 15 Annular flange 20 Punch 21 Circular end surface 22 First tapered outer peripheral surface portion 23 Second tapered outer peripheral surface portion 23a Maximum outer diameter portion 24 Constricted portion 25 Circular outer peripheral surface portion

Claims (1)

A method for manufacturing a ring stator of a motor comprising a ring-shaped stator body portion and a mounting flange formed at one opening edge of the stator body portion,
Prepare a disk-shaped blank of thickness t made of a metal material,
The disk-shaped blank is subjected to drawing processing while being vibrated at a predetermined pressing speed by a servo press, and a disk-shaped bottom plate portion having a thickness t, and a thickness t1 extending in an orthogonal direction from the outer peripheral edge of the disk-shaped bottom plate portion ( <T) a cylindrical body, and a cup-shaped molded product including an annular flange having a thickness t that spreads in an orthogonal direction outward from the opening edge of the cylindrical body,
Servo press is used to draw the cylindrical body to make the thickness t1 uniform,
Press the annular flange to make the annular flange uniform and flattened,
Press the disc-shaped bottom plate portion to form a pilot hole that is slightly smaller than the disc-shaped bottom plate portion,
Drawing the inner peripheral portion of the formed pilot hole, and expanding the inner peripheral portion so that it has the same diameter as the cylindrical body,
The cylindrical body after the inner peripheral edge portion is expanded is subjected to a drawing process to make the wall thickness t1 uniform, thereby forming the stator body portion,
A method of manufacturing a motor ring stator, wherein a mounting flange is formed by punching an annular flange.

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