JPH0248150Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spot welding robot using a stud gun.

Conventionally, as shown in FIGS. 1 and 2, this type of spot welding robot has a stud gun 2 mounted in a machine frame 10 so as to be movable up and down.
It is also possible to move in the lateral direction within the machine frame 10 by the rotation of . Then, small parts are welded to a large rectangular plate work W set on the base 10A of the machine frame 10.

The above-mentioned stud gun 2 has the advantage of making the robot body smaller and cheaper than when a normal C gun or X gun is attached.
As shown in the figure, it had to be vertical, and spot welding was impossible on surfaces other than the horizontal surface of the workpiece W, especially on the vertical surface.

The purpose of this invention is to solve the above-mentioned conventional drawbacks and make it possible to perform spot welding on all planes other than the horizontal plane of a workpiece even when using a stud gun. It consists of a stud gun, a special shaped tip placed directly below the stud gun and capable of rotating in a vertical plane, and an insert electrode facing the special shaped tip. The main idea is to make contact with the tip of the stud gun at a position away from the shaft.

The present invention will be described with reference to an embodiment shown in FIGS. 3 and 4. A stud gun 2 is installed in a machine frame 10 so as to be movable up and down.
As in the conventional example shown in FIGS. 1 and 2, the arm 11A of the actuator 11 can be moved laterally within the machine frame 10 by rotation of the arm 11A of the actuator 11. A special-shaped tip 5 is arranged directly below the stud gun 2, and the special-shaped tip 5 has a protrusion 5A formed at its tip, and is attached to the clamp arm 3 via a pin 4 so as to be rotatable within a vertical plane. The root end of the rod 3A of the clamp arm 3 is rotatably attached to the tip of the rod 1A of the clamp cylinder 1 via a hinge pin 3B. The special-shaped chip 5 is insulated from the clamp arm 3 by a Bakelite bush 6 and a Bakelite washer 7, and the upper surface 5 of the special-shaped chip 5
B comes into contact with the tip 8 of the stud gun 2 at a position away from the pivot axis of the specially shaped tip 5, that is, the hinge pin 4. Further, an insert electrode 9A is attached to the clamp arm 3 at a position facing the specially shaped chip 5 via a back pan 9.

In the above configuration, the stud gun 2 is placed at a predetermined position within the machine frame 10 by the actuator 11, and the specially shaped chip 5 is placed at a predetermined position directly below the stud gun 2 by the clamp cylinder 1. The back side of the vertical part _W1 of the workpiece W set on the stand part 10A is brought into contact with the insert electrode 9A, and the small part P is brought into contact with the front part. Next, when the stud gun 2 is lowered, the tip 8 of the stud gun 2 presses the top surface of the specially shaped tip 5, exerting a moment on the specially shaped tip 5 in the direction of the arrow in FIG. 3, and as a result, the vertical part _W1 of the workpiece W and the small part P
This is carried out by applying pressure between the protrusion 5A of the specially shaped chip 5 and the insert electrode 9A, and applying current between the chip 8 of the stud gun 2 and the insert electrode 9A via the specially shaped chip 5.

5 and 6 relate to another embodiment, and in this embodiment, a pair of stud guns 2, 2 are shown.
And correspondingly, a pair of specially shaped chips 5, 5,
and a pair of insert electrodes 9A, 9A are arranged, and the two small parts P, P are connected to the vertical part of the workpiece W.
Can be welded to W ₁ at the same time. Furthermore, it is also possible to use three or more specially shaped chips in parallel, making it possible to perform spot welding even in areas where the welding points are narrowly spaced. Furthermore, if we consider the stroke of the stud gun, it is possible to move the stud gun not only horizontally but also vertically without using the conventional multi-joint type robot body, that is, it is a robot with orthogonal coordinates on the X and Y axes. This makes it possible to reduce the cost of equipment.

As described above, the present invention applies the vertical pressing force applied to the special-shaped chip based on the lowering of the stud gun to a position on the upper surface of the special-shaped chip that is away from the rotation axis of the special-shaped chip. A moment based on the vertical pressing force is applied, and the vertical pressing force is converted into a pressing force in a direction other than horizontal or vertical, so that spot welding can be performed not only on the horizontal surface of the workpiece W but also on the vertical surface or a surface other than horizontal. possible.

[Brief explanation of drawings]

Fig. 1 is a plan view of the conventional example, Fig. 2 is a side view of the conventional example, Fig. 3 is a side view of an embodiment of the present invention, and Fig. 4 is a side view of the conventional example.
The figure is a front view of this embodiment, FIG. 5 is a side view of another embodiment, and FIG. 6 is a front view of this embodiment. In the diagram, 2... Studded gun, 4... Rotation axis, 5
...Specially shaped chip, 5A...Protrusion, 5B...
Specially shaped chip top surface, 9A...insert electrode,
10... Machine frame.

Claims (1)

[Scope of utility model registration request] It consists of a stud gun that is supported in a vertically movable manner within the machine frame, a specially shaped chip that is placed directly below the stud gun and is rotatable in a vertical plane, and an insert electrode that faces the specially shaped chip. The spot welding robot is characterized in that the upper surface of the tip is brought into contact with the tip of the tip of the stud gun at a position away from the rotation axis of the specially shaped tip.