JPH02198734A - Clamping device - Google Patents

Abstract

PURPOSE:To eliminate obstruction on the work upper face and to improve the yield of material in a device clamping a work placed on a table by a laser machine by fixing the work by sucking it from the lower part. CONSTITUTION:A support member 15 whose tip is like a sword tip is vertically fitted to the table 14 of a work machine and the center of a work 21 and its periphery are made to be supported thereby. A reference pad 16 is fitted at adequate intervals inside a frame 14a and the upper face becomes in the height almost coincident with the tip of the support member 15. A vacuum pad 17 is fixed to the table 14 at its leg part and connected to a vacuum device 20 via a joint 18 and hose 19. The peripheral edge of the work 21 evacuated by the vacuum device 20 is, thus fixed by being pressed to the vacuum pad 17 and reference pad 16 and the work 21 is subjected to laser machining.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a clamp device that fixes a workpiece placed on a processing table by suctioning it from below.

<Prior Art> A workpiece placed on a table or the like in a laser processing machine must be clamped by a clamping device so that its relative position with the table or the like does not shift during processing.

Conventionally, there is a device shown in FIG. 3 as a workpiece clamping device for laser processing.

Reference numeral 1 denotes a table, around which a frame 2 is provided at an appropriate height. A large number of support members 3 each having a tip shaped like a sword point are vertically attached to the table 1 to support the workpiece. 4 is a clamp body, and a reference pad 4a having a reference surface is provided at the height of the tip of the support member 3. The clamp body 4 has a female threaded portion in a portion facing the outside of the frame 2. A mounting lever 5 corresponding to a male thread is screwed here and passes through the clamp body 4 to attach the clamp body 4 to the frame 2.

Further, an air cylinder 6 is attached to the upper surface of the clamp body 4, and its rod 6a is pushed into the clamp body 4. A clamp claw 9 is provided within the clamp body 4.
is pivotally supported by a support pin 8 so as to be swingable in the vertical direction. The tip of the rod 6a of the air cylinder 6 is connected by a pin 7 to the rear of the portion of the clamp claw 9 that is pivotally supported by the support pin 8. A piston 6b is located within the air cylinder 6, and openings are provided on the side of the air cylinder 6 above and below the piston 6b.
A joint 10 is attached here, and an air hose 11 is further attached to the second joint 15. air hose 11
is connected to an air supply source via a valve. Clamp claw 9
A contact portion 9a is provided at the lower end of the tip.

By supplying and discharging air to the air cylinder 6, the rod 6a moves up and down, and the clamp claw 9 swings around the support pin 8, so that the clamp claw 9 moves the workpiece to the reference pad by the contact portion 9a. Pressure can be fixed or released.

<Problems to be Solved by the Invention> In the conventional clamping device as described above, the clamp claw, air cylinder, clamp body, etc. cover the top surface of the workpiece or protrude above the top surface. There is a risk that a nozzle during laser processing may come into contact with or collide with these objects and be damaged, or that a worker may be injured by coming into contact with these objects during laser processing.

In addition, since the clamp jaw touches the top surface of the workpiece, machining must be done at a certain distance from the periphery of the clamp jaw.
The workable range was severely restricted, resulting in poor material yield.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a clamping device for fixing a workpiece on a processing table, which includes a reference pad provided on the processing table side and on which the workpiece is placed. A vacuum pad is provided on the processing table side and is substantially flush with the upper surface of the reference pad, and a vacuum device applies a suction force to the vacuum pad.

Function: The workpiece is placed on the reference pad. In this state, the vacuum device is operated to apply suction force to the vacuum pad. The workpiece is sucked into the vacuum pad, pressed against the reference pad, and fixed.

Embodiment> A clamp device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a partial longitudinal section of a processing table on which an embodiment of the clamping device of the present invention is attached, and FIG. 2 shows a cross section taken along the line A-A in FIG. .

14 is a table of a laser processing machine, and a frame 14a is provided around the table at an appropriate height.

The table 14 has a support member 1 whose tip resembles a sword point.
5 are vertically attached to support the center and periphery of the workpiece. 16
is a reference pad, which is attached to the inside of the frame 14a at an appropriate interval, and whose upper surface is connected to the support member 15.
The height is almost the same as the tip of the.

A plurality of vacuum pads 17 are provided near the inside of the frame 14a. The legs of this vacuum pad 17 are fixed to the table 14 with bolts. The upper end of the vacuum pad 17 is elongated in the inner circumferential direction of the frame 14a, and a recess 17a is provided on the upper surface, and this upper surface is substantially flush with the upper surface of the reference pad 16.

A suction hole 17b is provided in the vacuum pad 17 and communicates with the recess 17a. A joint 18 is fitted into the frame 15 facing the side of the vacuum pad 17, and roughly the tip of the joint 18 is fitted onto the side of the vacuum pad 17. The suction hole 17b and the hole 18m in the joint 18 are electrically connected. The rear end of the joint 18 is a hose 19
is installed.

The hose 19 is further connected to a vacuum device 20, which is a vacuum device.

The vacuum device 20 is composed of a vacuum pump and follows a conduction path to vacuum the periphery of the workpiece 21 on the vacuum pad 17 in the direction of arrow 22 in the figure.

In the lamp device as described above, the peripheral edge of the workpiece 21 that has been evacuated by the vacuum device 20 is pressed and fixed against the vacuum pad 17 and in turn the reference pad 16, and the workpiece 21 is subjected to laser processing.

Note that the present invention is not limited to use when clamping a workpiece with a laser processing machine as in this embodiment, but can also be applied when clamping a material in other processing.

<Effects of the Invention> As shown in the above configuration, the present invention places a workpiece on a reference pad, applies suction force by a vacuum device to a vacuum pad that is substantially flush with the reference pad, and places the workpiece on the reference pad. Since it is fixed, there are no obstacles on the top of the workpiece, the laser processing nozzle and the worker's hands are not damaged by colliding with them, and the area that cannot be machined on the workpiece is reduced by m. , This improves the material yield.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view of a processing table to which an embodiment of the clamp device of the present invention is attached, Fig. 2 is a sectional view taken along the line A-A in Fig. FIG. In the figure, Table... 14 Reference pad... 16 Vacuum pad... 17 Vacuum device... 20 Work... 21 Figure 2 Figure 3 Figure 1

Claims (1)

[Claims] A clamping device for fixing a workpiece on a processing table, which includes a reference pad provided on the processing table side and on which the workpiece is placed, and a reference pad provided on the processing table side and substantially flush with the upper surface of the reference pad. A clamping device comprising: a vacuum pad that has a vacuum pad; and a vacuum device that applies suction force to the vacuum pad.