JPS6024228A - Beading method of cylindrical member - Google Patents

Abstract

PURPOSE:To make pressing continuous and to improve the operation efficiency thereof in forming a bead part of a cylindrical member by moving horizontally and circularly an intermediate member to which the cylindrical member is inserted and fitted under rolling reduction by an upper die with respect to a lower die thereby forming the bead part. CONSTITUTION:A cylindrical member 1 is inserted and fitted onto a work guide 21 of an intermediate die 12. An upper die 11 is lowered until clearance pins 18 contact with the die 12 and is thereafter lowered together with the die 12. The sliding plate 24 on the side face of the cam slider 23 provided to the die 12 moves horizontally the slider 23 longitudinally and transversely by the sine curve of the stationary cam 13 of a lower die. The beading punch 22 of the die 12 intrudes consequently into the recess of the beading die 17 of the upper die, thereby forming a bead. Since the bead part is formed with one time of pressing, the pressing of the cylindrical member is made serial and the efficiency of the pressing operation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing method for bead forming a cylindrical member such as a yoke of a motor.

In a conventional bead processing method for a cylindrical member, an annular protrusion 6 is provided on a rotary tool 2 having an outer diameter smaller than the inner diameter of the yoke 1, as in the example of a bead processing method for a motor yoke shown in FIG. A rotary tool 5 in which the annular projection 6 of the rotary tool 2 is inserted and the annular four portions 4 are provided at symmetrical positions of the annular protrusion 6 of the rotary tool 2.
A common method has been to form the bead 6 on the yoke 1 by installing and rotating the press. However, this bead processing method takes more time and has lower productivity than boss or edge processing using press forming, so it was impossible to set up a line that included bead processing in synchronization with press forming. .

The present invention was made in view of the above-mentioned problems, and the intermediate mold is pressed down by the upper mold and its movement is regulated by the lower mold, and the intermediate mold is caused to move in a circular manner and set between the upper mold and the intermediate mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, which provide a bead processing method for a cylindrical member that can bead formed into a cylindrical member with high accuracy within a very short period of time. In FIG. 2, (a), 11 is type 1 and o12 is intermediate type. Number 1 is the lower mold. The upper mold 11 has a press ram 14. Banocqua, plate 15° die holder 16.
Bead forming die 17. Clearance adjustment pin 18. Absorber 19. It is composed of a work holder 20. Intermediate type 1
2, a work guide 21, a bead forming punch 22. Cam slider 23. It is composed of a sliding plate 24. Lower mold 1 is Kunoshonpa, Do 25. ri, John Pin 26, Press Pole Star 27. Lower mold pa, de 28.
Lower die holder 29. It is composed of a fixed cam 30.

The absorber 19 in the upper mold 11 is an elastic body made of urethane rubber or the like, and elastically presses the work holder 20. The work kite 21 and the bead forming punch 22 in the intermediate mold 12 are the parts that are fitted into the die holder 16 of the upper mold 11, and the lower cam slider 23 is a fixed cam '50.
It is slidably engaged with the inside of the sliding plate 24 so that it can move freely, and is placed on the john pin 26.

Next, the operation will be explained. First, when the yoke 1 is set on the work kite 21 and the switch is turned, the mold 11 starts to descend and elastically presses the yoke 1 against the work kite 21. The upper die 11 further descends, and the clearance adjustment pin 1B contacts and pressurizes the lower cam slider 23.

At that point, the upper mold 11 and the intermediate mold 12 begin to descend as one. The cam slider 26 has an external shape as shown in FIG. 2, (b), and a fixed cam 30 whose inner surface is formed in a sine curve shape as shown in FIG. As shown in FIG. 2, the cam slider 23 is assembled so that it is surrounded on all sides, so the movement of the cam slider 23, which descends under pressure, is restricted as shown in FIG. 6, and the fixed cam 60 Then slide down A→A',
BeB', C←C'.

The motion of the circular filter 6 is synthesized by the motion of D4+α.

Along with this, the bead forming punch 22 and the work guide 21 also move eccentrically while drawing a circular trajectory, but the work guide 21 moves with the yaw 1 shifted from the bead forming center.
The yoke 1 is sandwiched between the concave grooves 1 of the bead forming die 17, and the protrusions 32 are strongly pressed while making a continuous circular motion to form a bead on the side surface of the yoke 1.

As detailed above, the method for beading a cylindrical member according to the present invention has the following advantages.

(2) Since the bead forming force is applied in a direction perpendicular to the axial direction of the cylindrical member, bead forming processing can be performed while suppressing deformation of the inner diameter of the member.

■, Similar to press molding, between the molds that lower the L,
Since it is possible to perform bead processing on cylindrical members within a short time, it is possible to input bead processing into a press line and perform integrated production work.

■The accuracy of the bead processing dimensions can be guaranteed by using a bead forming die and a bead forming punch.

■High productivity, continuous press processing is possible, and work-in-process inventory can be avoided as in the past.

■Easy to set up automated lines.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional bead processing method for a cylindrical member. FIG. 2, (a) is a bead processing die diagram of the cylindrical member according to the present invention. FIG. 2, (b) is a perspective view of a cam slider of an intermediate mold that engages with a lower mold in the mold for bead processing of a cylindrical part according to the present invention. FIG. 2, (・→ is a perspective view of a fixed cam that slidably engages with a cam slider in the bead processing type of cylindrical member according to the present invention. A plan view of the engagement of a cam slider and a fixed cam in a bead processing die for a member. Fig. 6 is a movement of the cam slider descending with its movement regulated by a fixed cam in a bead processing die for a cylindrical member according to the present invention. Explanatory diagram. 1. Yoke 20 Rotary tool 3 = Annular protrusion 4. Annular recess 5: Rotary tool 6: Bead 11: Upper mold 12: Intermediate mold 13: Lower mold 14 Nibble ram 15: Banok anop plate 16: Die holder 17: Bead forming die 18; Clearance adjustment pin 19: Absorber 20: Work holder 21: Work guide 22: Bead forming punch 23: Cam slider 24, sliding plate 25: Ri, John pad 26° Cushion pin 27: Press pole star 28: Lower die pad 29: Lower die holder 60: Fixed cam roller 1: Concave groove 32, protrusion 66 Circular patent applicant Co., Ltd. Mitsuba Electric Co., Ltd. Representative Sadao Hino (c) 30 2 0. ◎ ◎ 29 ◎ ◎ ◎ ◎ ) ◎ (剋於φ ◎ ) ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Fig. 3 2 m 154-

Claims (1)

[Claims] The movement of the intermediate mold, which is pressed down by the upper mold, is regulated by the lower mold, and a circular motion is synthesized in the intermediate mold, and bead molding is performed on a cylindrical member set and towed between the upper mold and the intermediate mold. A bead processing method for cylindrical members characterized by: