JP2569302Y2 - Mold return spring device for swaging machine - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a plurality of dies arranged in the circumferential direction are reciprocated in the radial direction, and the outer periphery of the bar is hit by the inner end in the moving direction of each die to make the bar have a predetermined outer diameter. The present invention relates to a swaging machine for drawing to dimensions, and more particularly to a return spring device for returning the above dies to a radially outward direction.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a conventional technique. In FIG. 4, reference numeral 1 denotes a cylindrical holder which is rotated. Four guide holes 2 penetrating in the radial direction are formed in the holder 1 at equal pitches in the circumferential direction. To be slidable in the direction. In each of the dies 3, both sides of the inner end of the dies 3a, 3b in the moving direction in the circumferential direction are formed on inclined surfaces 4a, 4b parallel to the bisector of the moving axis of the dies 3a, 3b. An arc-shaped blade 5 centered on the axis of the holder 1 is formed at the inner end in the moving direction of each mold 3.

On the slopes 4a and 4b, spring support holes 6a and 6b are formed so as to face each other at right angles to the bisectors of the moving axes of the dies 3a and 3b adjacent in the circumferential direction. The spring support holes 6a and 6b are formed as bottomed holes whose slopes 4a and 4b are open and whose inner ends are closed. Each of the spring support holes 6a,
Both ends of a return spring 7 composed of a coil spring are fitted to 6b, and the respective dies 3 are pressed and urged outward in the radial direction by the reaction force of each return spring 7. A pressurizing body 8 that is in contact with the outer end of each die 3 in the moving direction is slidably fitted to the outer peripheral portion of each guide hole 2 described above, and the outer peripheral surface of the holder 1 is fitted to the outer end of the pressing body 8 in the moving direction. A cam surface (not shown) projecting from the camshaft is formed, and this cam surface intermittently collides with a number of rollers (both not shown) interposed between the holder 1 and a ring body surrounding the holder 1. Then, the above-mentioned dies 3 are moved inward in the radial direction, and the blade 5 hits the outer periphery of a bar disposed on the axial center portion of the holder 1 to perform a drawing process, for example, to form a tension rod.

[0004]

In the above prior art, since both ends of the return spring 7 are fitted into spring support holes 6a and 6b formed in the inclined surfaces 4a and 4b of the mold 3, they are circumferentially adjacent to each other. When the dies 3a and 3b are out of synchronization, a shearing force is applied to the return spring 7, and the central portion 7a of the return spring 7 is broken or the operation becomes unstable. SUMMARY OF THE INVENTION An object of the present invention is to provide a new type return spring device for a swaging machine which has solved the above-mentioned disadvantages.

[0005]

Means for Solving the Problems The present invention is configured as follows in order to achieve the above object. That is, a number of dies are provided in the holder at a predetermined pitch in the circumferential direction and movably provided in the radial direction. A return spring is provided between the adjacent dies in the circumferential direction. In a mold return spring device of a swaging machine which is pressed and urged outward in the direction, both side surfaces of a moving direction inner end portion of a circumferentially adjacent mold are parallel to a bisector of a moving axis line of the adjacent mold. Formed on the slope to be provided, only one slope facing the circumferential direction is provided with a spring support hole orthogonal to the bisector,
One end of the return spring is accommodated in the spring support hole, and the other end of the return spring is brought into contact with the other slope facing the circumferential direction. It is effective if the return spring is provided with a contact piece at the other end, and the contact piece is brought into contact with the other slope facing the circumferential direction.

[0006]

Since the present invention has the above structure, the return spring is held by the spring support hole formed on one slope, so that the return spring is positioned at a predetermined position between the circumferentially adjacent dies. Become. Further, when the synchronization of the circumferentially adjacent molds is shifted, the other end of the return spring slides along the other slope facing the circumferential direction, and no shearing force is applied to the return spring.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view showing a main part of a first embodiment of the present invention. In FIG. 1, 1 is a holder, 2 is a guide hole formed in the holder 1, 3 (3a, 3b) is a mold slidably fitted in the guide hole 2, 4a, 4b is a mold adjacent in the circumferential direction. The slopes formed on both side surfaces of the inner ends of the moving directions of 3a and 3b have the same structure as the above-described conventional one. Reference numeral 10 denotes a spring support hole formed in one of the slopes 4a and 4b, which is perpendicular to the bisector of the movement axis of the dies 3a and 3b adjacent in the circumferential direction (perpendicular to the slope 4b). Direction) to form a hole with a closed bottom at the inner end.

One end of a return spring 11 composed of a coil spring is fitted into each of the spring support holes 10, and the other end protrudes in the direction of the other slope 4a. The contact piece 12 is fitted and supported on the other end of the return spring 11. The contact piece 12 is formed as a stepped shaft having a base 12a having a small diameter and a tip 12b having a large diameter. The base 12a is fitted into the other end of the return spring 11 and the spring support hole 10, and 12b is projected from the return spring 11 in the direction of the other slope 4a and slidably abuts on the other slope 4a. Then, the respective dies 3 are pressed and urged outward in the radial direction by the reaction force of the return spring 11.

FIG. 2 shows a second embodiment. In this device, the distal end portion 12b of the contact piece 12 is lengthened, and its base side is brought into close contact with the spring support hole 10 to be slidably fitted therein.
The length a is shortened and fitted and locked to the distal end of the return spring 11. In this device, the tip 12b is closely slidably fitted to the spring support hole 10 so that the tip 12b is supported by the spring support hole 10 when a lateral load is applied to the contact piece 12. As a result, no load is generated in the return spring 11 in the lateral direction.

FIG. 3 shows a third embodiment. This causes the other end of the return spring 11 to protrude from the spring support hole 10 and causes the other end 11a to directly contact the other slope 4a. Since this does not require the abutment piece 12, it is inexpensive and easy to assemble.

According to the above embodiment, since the return spring 11 is held at one end by the spring support hole 10 formed in the one slope 4b, the opposite slopes 4a, 4b of the mold 3 adjacent in the circumferential direction. It is positioned at a predetermined position between them so that it does not fall off carelessly. Also, if the synchronization of the radial movement of the dies 3a, 3b adjacent in the circumferential direction is deviated, the return spring 11
The abutment piece 12 (or the other end 11a of the return spring 11) provided at the other end of the slide spring slides along the other inclined surface 4a, so that no shear force is applied to the return spring 11.

[00012]

As is apparent from the above description, according to the present invention, the return spring for returning the mold to the outside in the radial direction even if the circumferential movement of the adjacent molds is out of synchronization. The shearing force is not applied, and the durability of the return spring increases, and the operation of the return spring is always stabilized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

FIG. 5 is an enlarged sectional view of a portion A in FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 holder 2 guide hole 3 mold 3a circumferentially adjacent mold 3b circumferentially adjacent mold 4a other slope facing circumferentially 4b one slope facing circumferentially 5 blade 8 pressurizing body 10 spring support hole 11 Return spring 11a Other end 12 Contact piece 12a Base 12b Tip

Continuation of the front page (72) Inventor Shinichi Nakamura 2418 Washizu, Kosai City, Shizuoka Prefecture Inside Fuji Univance Co., Ltd. (56) References JP-A-2-1755042 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. A large number of dies are provided in a holder at a predetermined pitch in a circumferential direction and movably in a radial direction. A return spring is provided between adjacent dies in a circumferential direction. In a mold return spring device of a swaging machine in which a mold is pressed and urged radially outward, both side surfaces of a moving direction inner end portion of a circumferentially adjacent mold are bisected by a moving axis line of the adjacent mold. A spring support hole is formed on a slope parallel to the line, and only one slope facing the circumferential direction is provided with a spring support hole orthogonal to the bisector. One end of the return spring is housed in the spring support hole and the return spring is provided. Characterized in that the other end of the spring comes into contact with the other slope facing the circumferential direction. 2. A contact piece is provided at the other end of the return spring,
2. The mold return spring device for a swaging machine according to claim 1, wherein the contact piece abuts on the other slope facing in the circumferential direction.