JPH0631459A - Spot welding equipment - Google Patents

Abstract

PURPOSE:To provide the spot welding equipment where the movable weight of a welding gun is reduced, an equalizing function is provided and works are not deformed, etc. CONSTITUTION:A cylinder supporting arm 6 to support a cylinder 4 to drive and move one electrode 2 of electrodes 2 and 3 arranged in opposition to each other and an electrode supporting arm 7 to support the other electrode 3 are provided freely swingably in the clamping direction on a pedestal part 5 and a connecting arm 8 is provided, to link both arms 6 and 7 together, by which moving operation in the clamping direction of both electrodes can be linked. Accordingly, when one electrode is driven to advance by the cylinder 4 and the works 12 are clamped between both electrodes, since the supporting arm at the side where the electrode abutted on the works 12 and subjected to abutment and pressurization is arranged is moved in the clamping direction and simultaneously, the other supporting arm is linked when the center in the clamping direction of the works 12 is different from the center in the clamping direction by both electrodes, both electrodes are coincident with the clamping center of the works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding apparatus that reduces the movable weight during spot welding and that does not apply unnecessary force to the workpiece during welding.

[0002]

2. Description of the Related Art When spot welding is performed by clamping a welding portion of a work by electrodes arranged opposite to each other and performing pressure welding to perform spot welding, the work is clamped by a center of the electrode and the electrode is arranged between the electrodes. It is important to match the welding direction center of the welded part of the work to be made, and if the two centers are different, the work will be deformed and the handling jig of the work will be damaged. In order to avoid an adverse effect when the center positions of the electrode side and the work side are different from each other, in the case where the spot welding device 27 is of a stationary type as shown in FIG. The handling jig 29 provided in the robot 34 or the like that conveys the work 33 to the welding position is provided with the equalizing mechanism 28 to support the work 33 in a floating state. Further, when the work side is fixed, as shown in FIG. 3, the spot welding gun 32 is supported in a floating manner via the eco-rising mechanism 31 provided in the spot welding apparatus body 30, so that the difference between the center positions of the spot welding gun 32 and the spot welding gun 32 can be prevented. Absorb.

[0003]

However, when the work is fixed, the weight of the movable portion of the welding gun 32 is large in the spot welding machine as shown in FIG. The inertial weight applied when operating the rising mechanism impacts the workpiece and handling jig and has a considerable effect. The present invention has been made in view of the above problems, and reduces the movable weight of a welding gun and has an eco-raising function,
An object of the present invention is to provide a spot welding device capable of performing spot welding without adversely affecting a work or a handling jig.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a means adopted by the present invention is that two electrodes are arranged facing each other on a base part, and at least one of the two electrodes is arranged. In a spot welding apparatus that drives a cylinder to advance and retreat to clamp a workpiece between both electrodes and perform spot welding, a cylinder that is swingably provided on the base and drives one of the electrodes is clamped in the clamping direction. Cylinder support arm movably supported on the base, an electrode support arm swingably provided on the base to support the other electrode movably in the clamp direction, the cylinder support arm and the fixed electrode support arm And a connecting arm that links the moving operation in the clamping direction with each other, and is configured as a spot welding apparatus.

[0005]

According to the present invention, a cylinder support arm for supporting a cylinder for driving one electrode of electrodes arranged oppositely to each other and an electrode support arm for supporting the other electrode are clamped on a base portion. It is possible to swing in any direction,
By providing a connecting arm for interlocking the both arms, the movement of both electrodes in the clamping direction can be interlocked. Therefore, when one electrode is driven to advance by the cylinder and the work is clamped between both electrodes, if the center of the work in the clamping direction and the center of the work in the clamping direction by both electrodes are different, the work is abutted and applied. Since the support arm on the side where the electrode receiving the pressure is arranged moves in the clamping direction, at the same time the other support arm is interlocked, so that both electrodes come into contact with the workpiece with the same force during clamping. At this time, the load exerted on the work by the contact of the electrode with the work is only a load for moving each support arm. Is extremely small.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. still,
The following example is an example embodying the present invention and does not limit the technical scope of the present invention. Figure 1
FIG. 1 is a side view showing a configuration of a spot welding device according to an embodiment of the present invention. In FIG. 1, a spot welding device 1
Is arranged such that the upper electrode 2 and the lower electrode 3 are opposed to each other and the cylinder 4 drives the upper electrode 2 to move back and forth, and the work 12 is clamped between the upper electrode 2 and the lower electrode 3 to perform spot welding. It is configured to be done. The upper electrode 2 is
It is mounted on the tip of a piston rod 14 of the cylinder 4, and the piston rod 14 is slidably supported by a fixed arm 9 provided on the base 5. The cylinder 4 for driving the piston rod 14 back and forth is supported by a cylinder support arm 6.
Is rotatably supported by a cylinder support fulcrum 10 provided on the base 5, and supports the cylinder 4 swingably in the clamping direction. A balance spring 13 is provided between the cylinder support arm 6 and the fixed arm 9 to support the weight of the cylinder 4 and hold it at a predetermined position. One lower electrode 3 is attached to the tip of an electrode support arm 7, and this electrode support arm 7 is rotatably supported by an electrode support fulcrum 11 provided on the base part 5,
Is swingably supported in the clamping direction. The position of the electrode support fulcrum 11 is arranged on the horizontal extension line of the point where the upper electrode 2 and the lower electrode 3 contact each other. The cylinder supporting arm 6 and the electrode supporting arm 7 are connected by a connecting arm 8 so that one swinging operation causes the other to interlock. Therefore, the upper electrode 2 and the lower electrode 3
When the work 12 is clamped between the upper electrode 2 and the lower electrode 3, the center of the inter-electrode clamp sandwiching the work 12 between the upper electrode 2 driven by the cylinder 4 and the lower electrode 3 is aligned with the center of the welding position of the work 12 in the clamping direction. If not done, the support arm (cylinder support arm 6 or electrode support arm 7) on the electrode side that first comes into contact with the workpiece 12 moves in the clamping direction, so that the other support arm is interlocked with the movement. By moving, the clamp center between the electrodes is made to coincide with the clamp center of the work 12. The load applied to the work 12 in the operation of aligning the clamp centers is a load that only causes the cylinder support arm 6 and the electrode support arm 7 to operate in an interlocking manner, and therefore has little influence on the work 12, and this operation causes the work 12 to move. Even when the welded portion is fragile, deformation is less likely to occur. In the above-described configuration, the entire spot welding apparatus 1 is configured to be fixedly installed on the installation table by the base unit 5 and the work 12 is conveyed, but the base unit 5 is attached to the tip of the robot arm. It is also possible to move the workpiece 12 to the position where the workpiece 12 is arranged and perform spot welding.

[0007]

As described above, according to the present invention, the cylinder support arm that supports the cylinder that drives one electrode of the electrodes arranged opposite to each other and the electrode support arm that supports the other electrode are provided. By providing the base portion so as to be swingable and providing the connecting arm for interlocking the both arms, the movement operation of both electrodes in the clamping direction can be interlocked. Therefore, when one electrode is driven to advance by the cylinder and the work is clamped between both electrodes, if the center of the work in the clamping direction and the center of the work in the clamping direction by both electrodes are different, the work is abutted and applied. Since the support arm on the side where the electrode receiving the pressure is arranged moves in the clamping direction, at the same time the other support arm is interlocked, so that both electrodes coincide with the clamp center of the workpiece. At this time, the load exerted on the work by the contact of the electrode with the work is only a load for moving each support arm. Therefore, it is possible to provide a spot welding apparatus that has a very small amount of deformation and has little influence on deformation of a work or a jig for handling a work.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a spot welding apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a welding configuration by a conventional example stationary spot welding apparatus.

FIG. 3 is a schematic configuration diagram showing a configuration of a conventional spot welding gun.

[Explanation of symbols]

 1 --- Spot welding device 2--Upper electrode 3--Lower electrode 4--Cylinder 5-Base part 6-Cylinder support arm 7-Electrode support arm 8-Connection arm 12-Work

Claims (1)

[Claims] 1. A base is provided with two electrodes facing each other, and at least one of the two electrodes is driven forwards and backwards by a cylinder to clamp a workpiece to be welded between the electrodes. In a spot welding device for welding, a cylinder support arm that is swingably provided on the base part and that supports a cylinder that drives the one electrode so as to be movable in the clamp direction, and a swingable part on the base part And an electrode support arm for supporting the other electrode movably in the clamp direction, and a connecting arm for connecting the cylinder support arm and the fixed electrode support arm to interlock the movement operation in the clamp direction. Spot welding equipment characterized by the following.