JPH0584529A - Device for clamping lower die of press - Google Patents

Abstract

PURPOSE:To obtain a clamp force to fix a lower die through an air cylinder to a bolster and to position the lower die. CONSTITUTION:A clamp body 5 equipped at plural places of a bolster 1 consists of an air cylinder 6, a tapered member 7 moved vertically by this air cylinder 6 and a pair of clamp arms 8 where the base part is pivoted by pins 9 and the tip part is opened and closed by these tapered members 7, and the tip side of this clamp arm 8 is inserted into the positioning hole 12a on the lower die side mounted on the bolster 1 and positioned in the divided groove 11a of the positioning member 11 to carry out positioning of the lower die to the bolster 1, an engaging part 8b to engage with an engaging part 12b in this positioning hole 12a is mounted on the tip part of this clamp arm 8, therefore, when the clamp arm by this tapered member 7 is expanded, a large clamp force can be put forth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower mold clamping device for a press, which positions and fixes a lower mold on a bolster of the press.

[0002]

2. Description of the Related Art Conventionally, a die used for a press is composed of an upper die and a lower die. The upper die is fixed to a lower surface of a slide, and the lower die is fixed to an upper surface of a bolster. There is. In addition, the lower die clamp device is used to fix the lower die to the bolster, but in the conventional lower die clamp device, a hydraulic pressure generator is provided on the bolster and the hydraulic pressure generated by this hydraulic pressure generator is used. A method of fixing the lower die to the bolster is generally adopted, and a positioning means such as a positioning pin for positioning the lower die on the bolster is provided separately from the lower die clamping device.

[0003]

However, in the conventional lower clamp device in which the hydraulic pressure generating device is provided in the bolster as in the prior art, a space for installing the hydraulic pressure generating device is required in the bolster, so that the bolster becomes large in size. In addition, in the case of the moving bolster, since the connection part of the hydraulic pipe is easily loosened, there is a problem that oil leaks, which hinders work and maintenance is troublesome.

Further, since the lower die and the bolster are provided with the positioning means, it is necessary to implant pins in the lower die and the bolster and to machine the pin holes, which requires a lot of man-hours for the machining and cost. There are also problems such as being bulky. The present invention has been made in order to improve the conventional problems,
It is an object of the present invention to provide a lower mold clamping device for a press, which can be fixed to a bolster by air pressure while the lower mold is positioned.

[0005]

In order to achieve the above object, the present invention provides a clamp main body installed at a plurality of positions of a bolster, an air cylinder, a taper member vertically moved by the air cylinder, and a base end. The part is pivoted by pins,
Further, the front end side is composed of a pair of clamp arms opened and closed by the taper member, and the front end side of the clamp arm is fitted into a positioning hole on the lower mold side mounted on the bolster to lower the bolster. Is positioned in the dividing groove of the positioning member for positioning, and an engaging portion that engages with the engaging portion in the positioning hole is formed at the tip end portion of the clamp arm.

[0006]

[Operation] With the above configuration, since the positioning member positions the lower die placed on the bolster, it is not necessary to provide a separate positioning means, and the clamp arm expanded by the air cylinder through the taper member lowers it. Since the mold is fixed, a clamping force equivalent to that of a hydraulic clamp can be obtained.

[0007]

EXAMPLE An example in which the lower clamp device of the present invention is applied to a moving bolster of a press will be described in detail with reference to the drawings. 1 is a plan view of a moving bolster, FIG.
Shows a plan view of a lower clamp device installed at, for example, six positions of the moving bolster.

In FIG. 1, 1 is a moving bolster,
A roller 2 for moving the moving bolster 1 in the front-rear direction with respect to the press (not shown) and a roller 3 for moving it in the lateral direction with respect to the press are provided in the lower part. The moving bolster 1 is capable of self-propelled by being rotationally driven by.

Reference numeral 5 is, for example, 6 of the moving bolster 1.
It is a clamp body installed at a location and has an air cylinder 6 in the moving bolster 1. Inside the air cylinder 6, a piston 6c descends by the air supplied to the port 6a and rises by the air supplied to the port 6b.
The piston rod 6d projecting upward from the piston 6c penetrates the end plate 6e to project upward from the upper surface of the moving bolster 1, and the taper member 7 is fixed to the tip portion. ing.

The taper member 7 can open the tip ends of the pair of clamp arms 8.
The lower end of the clamp arm 8 is rotatably supported by a pin 9 on a bracket 6f protruding from the upper surface of the end plate 6e, and the upper end of the clamp arm 8 is attached to the upper end of the air cylinder 6 via a mounting member 10. Positioning member 11 fixedly attached
Is inserted into the dividing groove 11a from below.

On the upper end side of each of the clamp arms 8, an inclined surface 8a is formed on the inner surface so as to be in sliding contact with the tapered surface 7a of the tapered member 7, and on the outer surface, a lower die (not shown) is formed. ) Is formed on the upper surface of the moving bolster 1. An engaging portion 8b is formed to engage with the engaging portion 12b of the positioning hole 12a provided in the adapter 12.

On the other hand, the positioning member 11 has a frustoconical shape with a small diameter on the upper end side, and is divided into left and right by a dividing groove 11a provided at the center, and a tapered surface 11b formed on the outer peripheral surface. Positioning hole 12 of adapter 12
The adapter 12 is positioned with respect to the moving bolster 1 by fitting it into a from below. Further, the dividing groove 1 is provided on the top of the positioning member 11.
A cap-shaped cover 13 is attached to prevent the entry of scrap, dust, and the like into the inside of 1a.

Next, the operation of the lower clamp device constructed as described above will be described. Before the lower die is mounted on the moving bolster 1, the piston 6c of the air cylinder 6 is in the lowered position, and the lower surface of the taper member 7 fixed to the tip of the piston rod 6d is located above the stepped portion 8c of each clamp arm 8 from above. Since they are in contact with each other, the tip end side of each clamp arm 8 is in the closed state as shown in the left half of FIG.

When the lower mold is placed on the moving bolster 1 via the adapter 12 in this state, the positioning members 11 are fitted into the positioning holes 12a of the adapter 12 from below, and the lower mold is attached to the moving bolster 1. Positioned.
When air is supplied to the port 6b of the air cylinder 6 in this state, the piston 6c rises and the taper member 7 fixed to the tip of the piston rod 6d expands the tip side of each clamp arm 8 around the pin 9. To do. As a result, the engaging portion 8b at the tip of each clamp arm 8 engages with the engaging portion 12b provided in the positioning hole 12a of the adapter 12 as shown in the right half of FIG. Fix the lower mold through.

In this state, the press work is carried out. During the work, the wedge-shaped taper member 7 expands the tip side of each clamp arm 8 to crimp the engaging portion 8b to the engaging portion on the adapter 12 side. Therefore, a clamping force equivalent to that of the hydraulic clamping device can be obtained. Although the above embodiment is an example in which it is installed in the moving bolster 1, it is of course applicable to a bolster fixed in the press.

[0016]

As described in detail above, according to the present invention, the clamping force for fixing the lower die to the bolster is generated by the air cylinder, so that the space required is smaller than that of the conventional one using hydraulic pressure. It can be installed easily and does not leak oil, so maintenance is easy. Further, since the positioning member that houses the clamp arm positions the lower die and the bolster, it is not necessary to provide positioning means such as a positioning pin separately from the clamp device. As a result, it is not necessary to lower the bolster or the lower die for positioning, so that the number of processing steps can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a moving bolster in which a lower clamp device according to an embodiment of the present invention is installed.

FIG. 2 is a plan view of the lower clamp device according to the embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 bolster, 5 clamp body, 6 air cylinder,
7 taper member, 8 clamp arm, 8b engaging portion, 9
Pin, 11 Positioning member, 11a Dividing groove, 12a
Positioning hole, 12b Engagement part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiro Mukai 15-1 Yoshitake-cho, Komatsu City, Ishikawa Prefecture (72) Inventor Tetsuya Sakai 144-13 Teraiguchi, Terai-cho, Nomi-gun, Ishikawa Prefecture (72) Toshio Nakata Ishikawa Ishikawa 92 Karuma-cho, Komatsu City, Japan

Claims (1)

[Claims] 1. A clamp main body 5 installed at a plurality of positions of a bolster 1, an air cylinder 6, a taper member 7 which is moved up and down by the air cylinder 6, and a base end of which is pivotally attached by a pin 9, and The tip side is composed of a pair of clamp arms 8 which are opened and closed by the taper member 7, and the tip side of the clamp arms 8 is fitted into a positioning hole 12a on the lower die side mounted on the bolster 1 to be inserted into the bolster 1. The dividing groove 11 of the positioning member 11 for positioning the lower mold with respect to
A lower clamp device for a press, which is located inside a and has an engaging portion 8b which engages with an engaging portion 12b in the positioning hole 12a at the tip of the clamp arm 8.