JPS6222709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding gun device used for performing spot welding at appropriate intervals on a workpiece extending longitudinally in the front-rear direction, such as a joining flange portion of an automobile body.

Conventionally, multi-spot welding equipment is known as this type of equipment, but this has the disadvantage of being relatively large and expensive.

The object of the present invention is to provide a device that does not have such inconveniences, and is provided with a device that extends and contracts at both the front and rear sides of a work that extends longitudinally in the front and back direction by selectively supplying oil pressure or other fluid pressure. A gun body consisting of half parts is provided, and one and the other of the two halves are provided with a pair of left and right clamp arms that can be opened and closed mutually, and a pair of left and right welding gun arms, and the clamp arm and the welding gun arm are connected to each other. By repeating alternately closing the gun body and expanding and contracting the gun body, the gun body is given intermittent feed along the workpiece.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawings, reference numeral 1 indicates a gun body, and the gun body 1 has both front and rear halves 2 and 3 that are fitted together with a cylinder 4 on one side and a piston 5 on the other side to selectively supply oil pressure and other fluid pressure. According to the above, it is a type that can be expanded and contracted as a whole, and this is a workpiece a that extends longitudinally in the front and back direction.
Provided at a lateral position. In the illustrated example, the workpiece a is a lower joining flange portion of an automobile body, and the workpiece is provided approximately along the lower side of the workpiece a. Furthermore, a pair of left and right clamp arms 6, 6 for clamping the workpiece a are provided on one side of the two halves 2, 3.
In addition, a pair of left and right welding gun arms 7, 7 are provided for clamping the workpiece a and performing spot welding on it.In the illustrated example, the clamp arm 6, 6 is provided so that it can be opened and closed by an operating cylinder 6a, and gun arms 7, 7 are provided at the rear end of the rear half 3 so that it can be opened and closed by an operating cylinder 7a.
In the drawing, reference numeral 8 indicates a guide bar on the lower side that guides both halves 2 and 3 so that they can move back and forth, and 9 indicates a guide roller on the upper side. It is assumed that it is in contact and rolls along this.

Furthermore, in the illustrated gun body 1, the gun body 1 is supported on a base 10 on the lower side thereof so as to be movable up and down, and can be raised and lowered by an elevating cylinder 11, and the base 10 is fitted onto a guide bar 12 extending in the front and back direction. It was jointly supported and could move forward and backward along this line.

To explain its operation, the gun body 1 is first prepared, for example, as shown in the first figure, that is, the base 10 is moved back together with the gun body 1, and the guide bar 1 is
The gun body 1 is then moved upward by the elevating cylinder 11 so that it is brought into contact with and supported by the guide roller 9 on the lower surface of the workpiece a above it. Next, from this state, the clamp arms 6, 6 and the welding gun arms 7, 7 are alternately closed, and the gun body 1 is expanded and contracted repeatedly. From the state where the rear gun arms 7, 7 are closed and the workpiece a is clamped, the gun body 1 is
is extended to bring it into the state shown in Figure 7. In this state, the front clamp arms 6, 6 are closed, and the rear gun arms 7, 7 are energized to cause spot welding on the workpiece a. 7,
7 is opened and the gun body 1 is contracted to the state shown in FIG. 8, and the rear gun arms 7, 7 are closed again at that position to clamp the workpiece. By repeating this process alternately, the gun body 1 is intermittently fed forward and the workpiece a is spot welded by the gun arms 7 at each position.

As described above, according to the present invention, the gun body is caused to be fed intermittently along the workpiece, and spot welding is performed on the gun body at each feeding position, so that it can be conveniently used in the manufacture of automobile bodies and other parts, and the apparatus as a whole is improved. is relatively small and can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view of an example of the device of the present invention, Fig. 2 is a cross-sectional view taken along the line - Fig. 3 is an enlarged cut-away side view of the main part thereof, and Fig. 4 is a part of the clamp arm portion thereof. FIG. 5 is a partially cut-away front view of the welding gun arm, and FIGS. 6 to 8 are partially cut-away side views illustrating its operation. a... Workpiece, 1... Gun body, 2, 3... Both halves, 6, 6... Clamp arm, 7, 7... Welding gun arm.

Claims (1)

[Claims] 1. A gun body consisting of front and rear halves that expands and contracts by selectively supplying oil pressure or other fluid pressure is provided at a side position of a workpiece that extends longitudinally in the front-rear direction, and one and the other of the two halves are mutually connected. It is equipped with a pair of left and right clamp arms that can be opened and closed, and a pair of left and right welding gun arms, and the clamp arms and the welding gun arms are alternately closed and the gun body is expanded and contracted repeatedly to cause the gun body to be attached to the gun body. A welding gun device configured to provide intermittent feed along the workpiece.