JP2000326024A - Hanging cam unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and weight of a whole die and to facilitate assembling in a cam unit of a press die. SOLUTION: A hanging cam unit 1 consists of a mounting base fixed to a moving die, a cam slider which is supported to a mounting base is energized in the return direction by an elastic member and is reciprocated with a desired stroke in a prescribed direction, and a cam driver, which moves the cam slider at an abutting face in the acting direction and is fixed to a fixed die, a mounting base 2 and the cam slider 3 are assembled by a slide keeper 4 in which the base parts are fixed to each of both side walls, the engaging part arranged to the tip is engaged with a slider engaging part arranged the other in order to sandwich the other and to slidably support it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam unit in a press die, and more particularly to a suspension cam unit used for drilling a small hole in a body frame for an automobile.

[0002]

2. Description of the Related Art Conventionally, a hanging cam unit is shown in FIG.
As shown in (a) and (b), a normal cam unit is mounted upside down. The mounting base 21 is fixed to a movable mold 20 that moves up and down.
And a cam slider 23 which is urged in a return direction by an elastic member 22 and reciprocated in a predetermined direction at a desired stroke, and a contact surface 24a which inclines the cam slider 23.
And a suspended cam unit comprising a cam driver 24 fixed to a fixed mold 25 by moving in a working direction.

[0003] A punch for punching is mounted on a tip surface 23a of the cam slider 23 via a retainer. Then, the punch is reciprocated in a diagonal direction at a predetermined stroke to form a hole in a body frame for an automobile, which is a workpiece.

[0004]

However, in the conventional hanging cam unit, the assembling of the mounting base 21 and the cam slider 23 is carried out in a recess provided substantially at the center of the upper portion of the cam slider 23 as shown in FIG. , A guide bar 26 is fitted, and a flat plate 27 is further covered on the upper part of the cam slider 23 and fixed with a hexagonal bolt 28.
With the cam slider 23 suspended from the guide bar 26, the guide bar 26 is attached to the attachment base 21 with a hexagon bolt.

The guide bar 26 is provided with a projecting portion 26a which is vertically suspended. A spring guide bar 29 is fixed to the inner wall of the projecting portion 26a substantially horizontally, and a coil spring which is an elastic member 22 is attached to the spring guide bar 29. Is fitted. Therefore, as shown in FIG.
The guide bar 26 is fitted to the upper portion of the cam slider 23 while the coil spring 9 and the coil spring are fitted in the concave portion of the cam slider 23.

As described above, the assembly structure of the mounting base 21 and the cam slider 23 has a problem in that the procedure including the mounting of the coil spring and the like is restricted, the number of parts is large, and it takes time and effort. There is. The hanging cam unit according to the present invention is proposed to solve such a problem.

[0007]

The gist of the present invention for solving the above-mentioned problems of the hanging cam unit according to the present invention is to provide a mounting base fixed to a movable mold and a return direction supported by the mounting base by an elastic member. A suspended cam unit comprising a cam slider which is urged and reciprocated in a predetermined direction at a desired stroke, and a cam driver which moves the cam slider in an operation direction on a contact surface and is fixed to a fixed mold. The mounting base and the cam slider are provided on either one of the side walls, and the base is fixed, and the engaging portion provided at the distal end is provided on the sliding engaging portion provided on the other. That is, it is assembled by a slide keeper that engages and holds the other side and slidably supports the other side.

In the other portion sandwiched by the slide keeper, a desired clearance is provided between the inner wall surface of the slide keeper and the other side wall surface.

According to the suspension cam unit of the present invention,
By the slide keeper, for example, the cam slider is slidably supported by being mounted on the mounting base, and has a simple structure.This reduces the number of parts, facilitates assembly, and facilitates disassembly and replacement. In addition, the weight of the entire suspension cam unit is reduced and the suspension cam unit is made compact. Further, by increasing the mounting accuracy of the slide keeper, for example, a desired clearance is secured between the slide keeper and the cam slider, and stable punching performance as a suspended cam unit can be maintained.

[0010]

Next, a suspension cam unit according to the present invention will be described with reference to the drawings. To facilitate understanding of the present invention, portions corresponding to those of the conventional example will be denoted by the same reference numerals as those of the conventional example.

As shown in FIGS. 1 and 2, the suspension cam unit 1 of the present invention comprises a mounting base 2 fixed to a movable mold 20 and an elastic member (coil spring) 22 supported by the mounting base 2. A cam slider 3 urged in a return direction and reciprocated in a predetermined direction (return direction and action direction) with a desired stroke;
The cam driver 24 is moved in the working direction by a and is fixed to a fixed mold 25.

The mounting base 2 and the cam slider 3 are provided, for example, with hexagonal bolts or the like on the side walls 2a and 2b of the side of the mounting base 2 where the meat portions are cut off to have a narrow width. The base 4a is fixed to the side walls 2a and 2b, and the tip 4b engages with a slide groove 3a provided on the upper part of the cam slider 3 to hold the cam slider 3 therebetween. Assembled by keeper 4,4.

The slide keeper 4 is, for example,
As shown in FIGS. 2 and 3 (a), the block is a rectangular flat plate-shaped block, and a bolt hole 4c for attachment and fixation is provided on the base 4a side.
Is provided so as to penetrate, and an L-shaped engaging portion 4 is
d is provided and formed.

On the other hand, above the cam slider 3,
A pair of slide grooves 3a in which the engaging portions 4d are fitted are provided on both side walls, and the depth of the grooves is such that a gap is formed between the engaging surface 4d and the end surface 4e of the engaging portion 4d facing the groove bottom surface 3b. Is set.

Further, as shown in FIG. 3B, in the portion (upper portion) of the cam slider 3 sandwiched by the slide keeper 4, 4, the slide keeper 4 is provided.
A desired clearance α is provided between the inner wall surface 4f and the side wall surface 3c of the cam slider 3.

By positioning the slide keeper 4 on the side walls 2a and 2b of the mounting base 2 with high precision and mounting the slide keeper 4, a clearance α can be set appropriately between the slide keeper 4 and the side wall surface 3c of the cam slider 3. It is.

As shown in FIG. 2, the spring guide 5 for supporting the coil spring 22, which is an elastic member for urging the cam slider 3 in the return direction, includes a spring seat 5a, a positioning projection 5b, a fitting projection 5c, Consists of When the spring guide 5 is mounted, as shown in FIG. 4, the fitting protrusion 5c is inserted into the mounting hole 2c of the mounting base 2 and fitted (the state may be loosely fitted). The cam slider 3 is set in the mounting base 2 by holding the coil spring 22 while pressing one end of the coil spring 22 against the spring seat 5a.

The positioning projection 5b of the spring guide 5
The length is significantly shorter than that of the conventional spring guide, so that the cam slider 3 can be easily assembled. In this manner, the hanging cam unit 1 of the present invention has a simple structure in which the cam slider 3 is sandwiched by the slide keeper 4 and 4 and is easy to assemble, and the thickness of the mounting base 2 is reduced. The weight is reduced. In the reciprocating movement of the cam slider 3, the clearance α is maintained, and the reciprocating movement is smooth.

[0019]

As described above, the suspension cam unit according to the present invention comprises a mounting base fixed to a movable mold,
A cam slider supported by the mounting base and urged in a return direction by an elastic member and reciprocated in a predetermined direction at a desired stroke, and fixed to a fixed mold by moving the cam slider in a working direction on a contact surface. The mounting base and the cam slider, wherein the base is fixed to each one of both side walls, and the engaging part provided at the tip is provided on the other. Is assembled by a slide keeper that engages with the sliding engagement portion and slidably supports the other by sandwiching the other, so that the number of parts as a suspension cam unit is reduced,
In addition, it has a simple structure, is easy to assemble and disassemble, has an excellent effect that the thickness of the mounting base 2 is reduced, the weight is reduced, and the size is reduced.

Further, since a desired clearance is provided between the inner wall surface of the slide keeper and the side wall surface of the cam slider at the portion of the cam slider sandwiched by the slide keeper, the cam slider reciprocates. The movement also has an excellent effect that the clearance is maintained and smooth reciprocation is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a suspension cam unit according to the present invention.

FIG. 2 is a front view of the suspension cam unit according to the present invention.

FIG. 3 is a sectional view (a) of a central portion of the suspension cam unit according to the present invention, and an enlarged sectional view of a part thereof (b).

FIG. 4 is an explanatory view showing a state of assembling the suspension cam unit according to the present invention.

FIG. 5 is a sectional view (a) and a front view (b) of a hanging cam unit according to a conventional example.

FIG. 6 is a partially enlarged cross-sectional view of the hanging cam unit according to the conventional example.

[Explanation of symbols]

1. Suspended cam unit, 2 mounting base, 3 cam slider, 4 slide keeper, 5 spring guide.

Continuation of front page (72) Inventor Hiroo Mishima 1-1-5 Nisshinmachi, Fuchu-shi, Tokyo F-term in Sankyo Oilless Industry Co., Ltd. (reference) 4E048 LB02 4E050 BA02 BA03 DA03 DA07

Claims (2)

[Claims] 1. A mounting base fixed to a movable mold, a cam slider supported by the mounting base, urged in a return direction by an elastic member and reciprocated in a predetermined direction by a desired stroke, and a cam slider. A hanging cam unit comprising a cam driver which is moved in an operation direction by a contact surface and is fixed to a fixed mold, wherein the mounting base and the cam slider are provided on each one of both side walls. A base portion is fixed, and an engaging portion provided at the distal end portion is assembled with a slide keeper which engages with a sliding engaging portion provided at the other side to sandwich and support the other side slidably. A hanging cam unit. 2. A desired clearance is provided between the inner wall surface of the slide keeper and the other side wall surface at the other portion sandwiched by the slide keeper. 4. The hanging cam unit according to 1.