JP7163544B2 - electrode for resistance welding - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrode used for resistance welding, and more particularly to an electrode for resistance welding in which an electrode portion called a swivel tip can swing.

As this type of electrode, conventionally, as shown in FIG. An arcuate recess 55 corresponding to the portion 53 is formed, and the arcuate tip portion 53 of the support member 52 is fitted into the arcuate recess 55 of the oscillation electrode 54 so that the oscillation electrode 54 can be oscillated on the support member 52 . When the work 57 is welded to the inclined surface of the work 56 , the swing electrode 54 swings against the support member 52 so that the electrode surface 58 of the swing electrode 54 contacts the work 57 , and the swing electrode 54 moves the work 57 . 56 and 57 were pressurized and energized. (For example, see Patent Document 1.)

Japanese Utility Model Publication No. 58-019029

In the above-described structure, when the upper electrode 51 is lifted after welding, the electrode surface 58 of the oscillating electrode 54 may not return to its original horizontal state. When the lower end of the inclined electrode surface 58 comes into contact with the work 57, if the work 57 is deformed due to waviness, distortion, etc., the deformation of the work 57 prevents the swinging of the swinging electrode 54. However, there is a problem that the weld is defective.

The present invention solves the above-mentioned problems and provides an urging device that urges the oscillating electrode so that the electrode surface is always horizontal. The object of the present invention is to provide a resistance welding electrode that prevents

The resistance welding electrode of the present invention, which has been devised to solve the above problems, has an arc-shaped projection formed on one of the tip of the support member and the base end of the oscillating electrode, and an arc-shaped projection corresponding to the arc-shaped projection on the other. A resistance welding electrode in which a concave portion is formed and an arc-shaped projection is fitted in the arc-shaped concave portion to oscillate the oscillating electrode on a support member, and the oscillating electrode is biased so that the electrode surface becomes horizontal. It is characterized by providing an urging device.

The urging device includes a compression coil spring mounted in a mounting hole provided at the center of the arc-shaped projection, and between the tip of the compression coil spring and the wall surface of the conical recess provided at the center of the arc-shaped recess. It consists of interposed spheres .

When the electrode surface of the oscillating electrode is horizontal, it is preferable that the oscillating electrode is supported by the support member with the arc-shaped recess separated from the arc-shaped projection by the urging force of the urging device. is defined as the invention of claim 2 .

In the present invention , since the urging device is provided to urge the oscillating electrode so that the electrode surface becomes horizontal, when the upper electrode rises, the electrode surface of the oscillating electrode always becomes horizontal, thereby preventing welding defects. can.

The urging device comprises a compression coil spring mounted in a mounting hole provided at the center of the arc-shaped projection, a tip of the compression coil spring, and a wall surface of a conical recess provided at the center of the arc-shaped recess. Since it is composed of the sphere interposed therebetween, the oscillating electrode can be oscillated smoothly by the rotation of the sphere.

In the second aspect of the present invention, when the electrode surface of the oscillating electrode is horizontal, the oscillating electrode is supported by the support member with the arc-shaped recess forming a space from the arc-shaped projection by the urging force of the urging device. Therefore, the oscillating electrode can be oscillated smoothly with a weak force.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows embodiment of this invention. FIG. 2 is a cross-sectional view showing a state of the electrode of FIG. 1 during welding; FIG. 10 is a cross-sectional view showing a conventional example;

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. Reference numeral 1 denotes a conductive support member consisting of a base portion 2 and an arc-shaped projection 3 formed at the tip of the base portion 2. The base end portion of the arc-shaped projection 3 is larger in diameter than the base portion 2, and A stepped portion 4 is provided between and a cylindrical mounting hole 5 is provided at the center of the tip of the arcuate projection 3 .

Reference numeral 6 denotes a conductive rocking electrode comprising an electrode portion 7 and a retaining member 9 attached to the proximal end of the electrode portion 7 with a bolt 8. The tip surface of the electrode portion 7 of the rocking electrode 6 is flat. An electrode surface 10 having a shape is formed, and an arc-shaped recess 12 having a conical recess 11 provided in the center corresponding to the arc-shaped projection 3 of the support member 1 is formed on the base end surface, and a retaining member 9 is formed with a through hole 13 through which the base portion 2 of the support member 1 is passed.

Reference numeral 14 denotes a compression coil spring 15 mounted in the mounting hole 5 of the support member 1, and a sphere 16 which is a steel ball interposed between the tip of the compression coil spring 15 and the wall surface of the conical recess 11 of the rocking electrode 6. The urging device 14 urges the rocking electrode 6 so that the electrode surface 10 is always horizontal, and when the electrode surface 10 of the rocking electrode 6 becomes horizontal , the arc-shaped recess 12 of the oscillation electrode 6 is supported with a space from the arc-shaped projection 3 of the support member 1 .

Next, a method for assembling the electrode will be described. A compression coil spring 15 is mounted in the mounting hole 5 of the support member 1, a ball 16 is placed on the tip of the compression coil spring 15, and the arc-shaped projection 3 of the support member 1 is The retaining member 9 is fitted to the arc-shaped concave portion 12 of the swinging electrode 6, and the retaining member 9 is attached to the base end of the electrode portion 7 with the bolt 8 by passing the through hole 13 of the retaining member 9 through the base portion 2 of the supporting member 1. At this time, as shown in FIG. The mounting hole 5 and the conical recess 11 are also in correspondence with each other at a distance.

1, the upper electrode 17 descends from the state where the electrode surface 10 of the rocking electrode 6 is horizontal, the rocking electrode 6 comes into contact with the workpiece 18, and the support member 1 is arc-shaped. As the protrusion 3 contacts the arc-shaped concave portion 12 of the swing electrode 6, the swing electrode 6 swings, and as shown in FIG. 17, the works 18 and 19, and the lower electrode 20, the current flows and the works 18 and 19 are welded.

After welding, when the upper electrode 17 rises, the swinging electrode 6 moves away from the arcuate projection 3 of the supporting member 1 by the spring force of the urging device 14, and swings so that the electrode surface 10 becomes horizontal. In this state, the stepped portion 4 of the support device 1 comes into contact with the retaining member 9 and stops, resulting in the state shown in FIG.

As described above, according to the present invention, the urging device 14 is provided for urging the rocking electrode 6 so that the electrode surface 10 becomes horizontal. Since the electrode surface 10 becomes horizontal, defective welding can be prevented.

The urging device 14 includes a compression coil spring 15 mounted in a mounting hole 5 provided in the center of the arc-shaped projection 3 and a conical spring provided at the tip of the compression coil spring 15 and the center of the arc-shaped recess 12 . Since the spherical body 16 is interposed between the wall surfaces of the concave portion 11, the rotation of the spherical body 16 allows the rocking electrode 6 to rock smoothly.

Further, when the electrode surface of the swinging electrode 6 is horizontal, the swinging electrode 6 is supported by the support member 1 by the biasing force of the biasing device 14 so that the arcuate recess 12 opens a space from the arcuate protrusion 3 . Therefore, the swing electrode 6 can be smoothly swung with a weak force.

Reference Signs List 1 Supporting member 2 Base 3 Circular projection 4 Stepped portion 5 Mounting hole 6 Oscillating electrode 7 Electrode 8 Bolt 9 Retaining member 10 Electrode surface 11 Conical recess 12 Circular recess 13 Through hole 14 Biasing device 15 Compression coil spring 16 sphere

Claims (2)

An arc-shaped projection is formed on one of the tip of the support member and the base end of the oscillation electrode, and an arc-shaped recess corresponding to the arc-shaped projection is formed on the other. A resistance welding electrode in which a rocking electrode is supported in a rockable manner is provided with a biasing device for biasing the rocking electrode so that the electrode surface becomes horizontal, wherein the biasing device Composed of a compression coil spring mounted in a mounting hole provided at the center of an arc-shaped projection, and a sphere interposed between the tip of the compression coil spring and the wall surface of a conical recess provided at the center of the arc-shaped recess. A resistance welding electrode characterized by: When the electrode surface of the oscillating electrode is horizontal, the oscillating electrode is supported by the supporting member with a space between the arc-shaped recess and the arc-shaped projection due to the biasing force of the biasing device. The electrode for resistance welding according to claim 1 .

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