JPS6213744Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, the electrode tip of a spot welding machine clamps a workpiece and then welds the workpiece by energizing it. Further, positioning and locking of the workpiece was performed by a clamp mechanism.

However, since the clamping mechanism cannot be placed on the part of the workpiece to be spot-welded, the welded part of the workpiece cannot be reliably positioned and clamped, and although the workpiece is clamped by the electrode tip, it cannot be positioned.

Since the present invention is constructed as described in the claims of the utility model registration, a workpiece positioned by a clamper and a support base can be spot-welded using the first and second electrodes. Therefore, since the spot welds are reliably positioned and are reliably positioned and clamped, the urging force of the urging means can be reduced.

Hereinafter, one embodiment of the present invention will be described in detail.

In the drawing, a support stand 1 has a clamping surface 2 for clamping a workpiece. The clamper 3 is pivotally supported by the support base 1 and is rotatably formed by an air cylinder 4 serving as a pressurizing mechanism, and has a clamping portion 6 formed on the lower surface of the head portion 5. The first electrode 7 is arranged to move vertically within the head section 5 via an insulator 8, has a wire cable 9 connected to a power source attached to its upper end, a chip 10 attached to its lower end, and A flange 11 is formed at the flange 11, and double-tubular cooling pipes 12 and 13 are provided in the intermediate portion. Note that the tip 10 is formed so as to be able to protrude from the holding portion 6.
The biasing member 18 made of urethane has its upper end abutted against the head portion 5 and its lower end abutted against the flange 11. The second electrode 14 is installed in the support base 1 via an insulator 15, and the tip 16 at the tip is held on the clamping surface 1.
It is arranged so as to be located within the same plane as the clamping surface 2. 17 is a workpiece.

The workpiece 17 is first placed on the clamping surface 2, and then the air cylinder 4 is extended to hold the clamper 3.
rotates counterclockwise from the position indicated by the two-dot chain line to press the clamping part 6 of the head part 5 against the workpiece 17, and the workpiece 17 is clamped by the clamping surface 2 and the clamping part 6.
At this time, the biasing force of the air cylinder 4 is applied to the biasing member 1
8, the tip 10 is larger than the biasing member 18.
It moves upward against the urging force of and presses into contact with the upper surface of the workpiece 17. Subsequently, a constant current is applied between the first and second electrodes 7 and 14 to spot weld the workpiece 17. Next, the air cylinder 4 is contracted and the clamper 3 is returned to the position indicated by the two-dot chain line. Cooling water flows in from the cooling pipe 12 and flows out from the cooling pipe 13.

Therefore, since the spot welded part of the workpiece 17 is clamped and positioned between the support base 1 and the clamper 3, the welded part can be clamped and positioned more reliably than in the conventional case, and the clamping work and the electrode tip workpiece are Since clamping and clamping can be done at the same time, work efficiency is improved.

[Brief explanation of the drawing]

The drawing is a partial sectional view showing an embodiment of the present invention. 1: Support base, 2: Clamping surface, 3: Clamper, 4:
Air cylinder, 6: Holding part, 7: First electrode, 1
4: second electrode, 17: work.

Claims (1)

[Scope of utility model registration request] a support stand; a clamper that is pivotally supported on the support stand and has a clamping part that positions and locks the workpiece by clamping the workpiece between a workpiece holding surface formed on the support stand by the operation of a pressurizing mechanism; or a first electrode provided on one side of the clamper and formed so as to be able to protrude from one of the clamping surfaces or the clamping part by means of a biasing means provided in the one, provided on the other of the clamping surface or the clamping part; A spot welding machine characterized by having a second electrode.