JPH11319993A - Cam unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a production cost by forming one of a cam driver making up a cam unit to a simple construction bar like body. SOLUTION: The cam unit 1 consists of a cam driver 2, which is fixed to one side of a die and drives the cam, and a cam slider 3, which is driven in prescribed direction by the cam driver and is slidably arranged on the other side of the die. In this case, the cam driver 2 is formed to a bar like body integrally having both a cam face 2c, which moves the cam slider 3 in a prescribed direction, and a forced return face 2d, which is at an opposite side of the cam face 2c and returns the cam slider 3 to an original position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam unit of a mold, and more particularly to a cam unit of a press mold for bending an edge of a body frame for an automobile.

[0002]

2. Description of the Related Art Conventionally, when a large metal plate such as an automobile body is molded with a lower fixed mold and an upper movable mold in a vertical direction, holes are formed in the side surfaces of the molded product. To drill or bend the edges, see FIG.
As shown in the figure, the cam unit 1a is attached to a mold. For example, the cam driver 21 of the movable mold 20 is provided with a tapered surface 21a, and the cam slider 22 having a tapered surface 22a abutting on the tapered surface 21a and sliding on the base 24 of the fixed mold in a predetermined range in the left-right direction. And a tool 23 (for example, for drilling) is fixed to the side surface of the cam slider 22.

The cam slider 22 slides on the base 24 in the left-right direction by the vertical reciprocating movement of the movable mold 20, and the side surface of the molded product 25 is machined by the tool 23.

When the cam driver 21 is moved upward together with the movable mold 20, the cam slider 22
It is returned to the original position by the urging force of the elastic body 26 such as a spring constantly urging to the left. However, depending on only the biasing force of the elastic body 26, the molded product 25
In order to separate the tool 23 from the molded product 25 from the molded product 25, it is impossible to remove the tool 23 or the like from the molded product 25 because force is insufficient.

[0005] Therefore, as shown in FIGS.
Is fixed with a bolt or the like, and an engaging groove 22b for engaging with an engaging claw formed at the tip of the follower 21b is provided on the side wall of the cam slider 22 in parallel with the tapered surface 22a, and these force return. Follower 21b and engagement groove 22b
Are provided as forcible return means.

When the cam driver 21 moves upward by the forced return follower 21b, the engaging claw of the forced return follower 21b contacts the upper slope of the engaging groove 22b, forcing the cam slider 22 to the left. Pull back to. As a result, the tool 23 attached to the cam slider 22 is separated from the processed portion of the molded product 25, and thereafter, the cam slider 22 is moved leftward by the urging force of the elastic body 26 as the cam driver 21 rises. To return to the original position.

The above-described cam structure (FIGS. 6 to 8) describes a horizontal cam unit. As shown in FIG. 9, a cam slider (cam base 27, slider 28, Forced follower 2
9), and the same effect can be obtained in the case of the suspended cam unit 1a in which the cam driver (driver 30, cam bottom slide plate 31) is mounted on the lower fixed die.

[0008]

However, in the horizontal cam unit or the suspension cam unit attached to the mold, the cam drivers 21, 31 are provided with contact surfaces 21a, 31a as cam surfaces on one side. However, since the forced return followers 21b and 29 are provided separately, there is a problem that the size becomes large as a whole and the number of parts is increased, so that the die manufacturing cost is increased. The cam unit according to the present invention is proposed to solve such a problem.

[0009]

The gist of the present invention for solving the above problems of the cam unit according to the present invention is to provide a cam driver fixed to one side of a mold and driving a cam, and a cam driver driven in a predetermined direction by the cam driver. A cam unit comprising a cam slider slidably provided on the other side of the mold, wherein the cam driver is provided with a cam surface for driving the cam slider and an opposite side of the cam surface, and the cam slider is moved to its original position. Is formed in a rod-shaped body integrally having a forced return surface for returning to a state.

Further, the cross-sectional shape of the rod-shaped body in the cam driver may be any one of a circle, an ellipse, and a rectangle.

[0011] According to the cam unit of the present invention, one of the cam drivers constituting the cam unit is formed as a rod having a simple structure, so that the die manufacturing cost can be drastically reduced. Things.

[0012]

Next, a cam unit according to the present invention will be described with reference to the drawings. Note that, for easy understanding of the invention, portions corresponding to the conventional example are denoted by the same reference numerals as the conventional example.

The cam unit 1 according to the present invention is a unit that can be independently replaced with a mold. As shown in FIG. 1, for example, in the vertical direction, a lower fixed mold 24 and an upper movable mold 24 are movable. It is provided in a mold (see FIG. 6) in which a molded product is molded by the mold 20. The cam unit 1 is a suspended cam type unit, and includes a cam driver 2 for cam operation and a cam slider 3 for cam operation. The cam driver 2 is fixed to one fixed mold 24 of a mold.

The cam driver 2 is fixed to a fixed mold 24 with bolts or the like, and includes a driver support 2a for supporting the driver main body 2b and the rod-shaped driver main body 2b.

The driver body 2b is supported by being inclined at a required angle.
A part 2e is cut off to make the cam slider 3 smoothly engage with the slider body 3a.

The shape of the driver main body 2b is as follows.
Usually, the cross section is a circular rod-shaped body, but the present invention is not limited to this. For example, the rod-shaped body may have an elliptical or rectangular cross-sectional shape, or may have a shape similar to these shapes. In short, the driver main body 2b integrally has a cam surface 2c for driving the cam slider 3 and a forced return surface 2d opposite to the cam surface 2c and for returning the cam slider 3 to the original position. It is good if it is.

Since the driver main body 2b is a rod-shaped body having a circular cross section or the like and has a simple shape, the manufacturing cost is greatly reduced.

On the other hand, as shown in FIG. 1, the cam slider 3 which is moved in a predetermined direction by the cam driver 2 is set up on both ends of a rectangular base in a movable die 20 of a press die. Support parts 4a, 4b
Is fixed by bolts or the like.

A lubricating material 5 is fixed on the surface of the base 4, and two round bars 6, 6 are laid across the supporting portions 4a, 4b. The round bars 6, 6 are inserted into the through holes 3b at the upper part of the slider body 3a. As shown, the left half of the through hole 3b is enlarged in diameter, and a compression spring 7 is provided between the support portion 4b and the enlarged hole bottom as an elastic body for returning the slider. It is fitted on the round bar 6,6.

In the lower part of the slider body 3b, there is formed a through hole 3c corresponding to the inclination of the driver body 2b of the cam driver 2 fixed to the fixed die 24 and corresponding to the shape of the driver body 2b. Has been drilled. The small-pitch hatched portion 3d indicates a portion that has been subjected to a lubrication or oilless processing.

In FIG. 1, the through hole 3c has a cam surface 3e whose upper surface is in contact with the cam surface 2c of the driver body 2b.
The lower surface is a forced return action surface 3f that abuts the forced return surface 2d of the driver main body 2b. Slider body 3
b only needs to have at least the cam surface 3e and the forcible return action surface 3f, and the surface (sliding contact surface) in the front-rear direction (the direction perpendicular to the paper surface) in FIG. Is also good.

With the suspension cam type cam unit according to the present invention, the cam driver 2 fixed to the fixed mold 24 is moved by the cam slider 3.
Is moved up and down by the movable mold 20 so that the driver body 2
b, and reciprocates in an oblique arrow a.

In the second embodiment of the present invention, as shown in FIGS. 4 and 5, the cam driver 2 and the cam slider 3
This is a horizontal cam type cam unit 1c which is installed at the upper and lower positions opposite to the suspended cam type. The operation and effects thereof are almost the same as those of the above-mentioned suspended cam type cam unit 1, and duplicate description will be omitted.

[0024]

As described above, the cam unit according to the present invention comprises a cam driver fixed to one side of a mold and driven by a cam, and a cam driver which is moved in a predetermined direction by the cam driver and is slidable on the other side of the mold. Wherein the cam driver is adapted to return the cam slider to its original position on a side opposite to the cam surface for moving the cam slider in a predetermined direction. Since the cam driver is formed in a rod-like body integrally having a return surface, the cam driver is compact and lightweight, has a simple shape, and has an excellent effect that the manufacturing cost is greatly reduced. is there.

Since the cross-sectional shape of the rod-shaped body in the cam driver is any one of a circle, an ellipse, and a rectangle, the shape of the driver main body is simple and easy to process. The formation of the engaging through-hole is also facilitated, and there is an excellent effect that the manufacturing cost of the entire cam unit is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a use state of a suspended cam type cam unit according to the present invention.

FIG. 2 is a side view of a base in the suspension cam unit according to the present invention.

FIG. 3 is a plan side view of a base in the suspension cam unit according to the present invention.

FIG. 4 is a front view showing a usage state of the horizontal cam type cam unit according to the present invention.

FIG. 5 is a partial side view of the horizontal cam unit according to the present invention.

FIG. 6 is a front view schematically showing an entire mold including a cam unit 1a according to a conventional example.

FIG. 7 is a front view of a cam unit 1a according to the conventional example.

FIG. 8 is a sectional view taken along the line BB in FIG. 7;

FIG. 9 is a front view (a) showing the configuration of the suspension cam unit according to the conventional example, and a sectional side view (b) of the same part.

[Explanation of symbols]

1. Suspended cam unit according to the present invention, 1c Horizontal cam unit according to the present invention, 2 cam driver, 2a driver support base, 2b driver main body, 2c cam surface,
2d Forced return surface, 3 cam slider, 3a slider body, 3b through hole, 3c through hole, 3d lubricated or oilless processed part, 3e cam surface, 3f
Force return surface, 4 bases, 4a, 4b support, 5
Lubricants, 6 round bars, 7 springs, 25 molded products, 26
Elastic body.

Claims (2)

[Claims] 1. A cam unit comprising: a cam driver fixed to one of molds for driving a cam; and a cam slider moved in a predetermined direction by the cam driver and slidably provided on the other side of the mold. The cam driver is formed as a rod-shaped body integrally having a cam surface for moving the cam slider in a predetermined direction and a forced return surface for returning the cam slider to an original position on the opposite side of the cam surface. A cam unit. 2. The cam unit according to claim 1, wherein the cross-sectional shape of the rod-shaped body in the cam driver is any one of a circle, an ellipse, and a rectangle.