JP4229372B2 - Electrode tip for spot welding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrode tip for spot welding that can be used continuously over a long period of time.
[0002]
[Prior art]
[Patent Document 1]
Japanese Utility Model Publication No. 62-165083
For example, spot welding is widely used in the manufacturing process of automobile parts and various mechanical / electrical parts. Conventionally, a thin diameter portion is formed at the tip of a cylindrical shank, and a cap is formed on the thin diameter portion. A spot welding electrode tip fitted with a tip is used. In such an electrode tip, if the cap chip is continuously used, the cap tip is worn and cannot be accurately welded. Therefore, it is necessary to replace the cap tip with a new cap tip after a certain period of use.
[0004]
However, as shown in FIG. 2, the cap tip can be replaced by inserting the removal tool 10 between the cap tip and the base of the thin shank portion, and pulling the cap tip upward by the lever principle. At this time, there is a problem in that there is a risk that the base portion of the shank narrow diameter portion may be destroyed or damaged by the removal tool.
On the other hand, recently, there are many cases in which the component parts of the electrode tip are molded by press work instead of conventional cutting. In this case, the surface of the shank narrow diameter portion is slippery, and the cap tip falls off during use. There was a problem of end. In particular, new materials such as high-strength steel plates have recently emerged, and spot welding with high voltage and high pressure has come to be required, the chip temperature during welding has risen, and the cap chip has fallen off. It has come to occur frequently.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, prevents damage to the shank when removing the cap tip, or prevents the cap tip from falling off and can be used continuously for a long period of time. It was completed for the purpose of providing chips.
[0006]
[Means for Solving the Problems]
The present invention made in order to solve the above-described problems is the electrode tip for spot welding in which a thin-diameter portion is formed at the tip of the cylindrical shank, and a cap tip is fitted to the thin-diameter portion. A spot welding electrode tip comprising a reinforcing ring for press-fitting shank breakage at the time of removal of a cap tip made of a hard material of beryllium copper alloy or high speed alloy is press-fitted and attached to the base of the first invention. To do.
Further, a second aspect of the present invention is an electrode tip for spot welding in which the narrow-diameter portion is formed in a tapered shape and a ring-shaped concave groove for preventing cap tip removal is formed on the tapered surface.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 1 is a cylindrical shank made of a normal copper alloy, 2 is a narrow diameter portion formed at the tip of the shank 1, and an electrode for spot welding in which a cap chip 3 is fitted to the narrow diameter portion 2. The tip is basically the same structure as a conventional spot welding electrode tip.
And in 1st this invention, it has the characteristic structure at the point which attached the ring 4 for a reinforcement made from a high hardness material to the base of the said small diameter part 2. As shown in FIG. With such a configuration, even if the removal tool 10 hits when removing the cap chip, it is possible to effectively prevent the shank 1 from being damaged.
[0008]
As shown in FIG. 3, the reinforcing ring 4 is formed of an annular band having a width of about 10 mm and a thickness of about 1 to 3 mm. It is fixed with screws 4a. As shown in FIG. 2, when the cap tip is replaced, the removal tool 10 is inserted between the cap tip 3 and the base of the shank narrow diameter portion 2, and the cap tip is pulled upward by the lever principle. In order to prevent the removal tool 10 from being hit and broken or damaged.
Accordingly, it is necessary to form the reinforcing ring 4 from an alloy such as beryllium copper alloy or hard steel high speed steel having high strength and high conductivity. It is preferable to do.
[0009]
Further, the narrow-diameter portion 2 can be formed in a tapered shape, and a ring-shaped concave groove 5 for preventing the cap chip from coming off can be formed on the tapered surface. With such a configuration, it is possible to effectively prevent the cap chip 3 from falling off during use.
[0010]
As shown in FIGS. 4 to 5, the cap-shaped recess groove 5 for preventing cap chip removal is formed regularly or randomly on a tapered surface, such as a ring shape or a spiral shape, and has a width of about 0. .3 to 1.0 mm and the depth is about 0.1 to 0.5 mm. Then, when the cap chip 3 is press-fitted into the shank 1, the cap chip 3 bites into the ring-shaped concave groove 5, whereby the fitting between the two becomes stronger and the cap chip 3 is prevented from falling off. .
[0011]
According to a second aspect of the present invention , a reinforcing ring 4 made of a high hardness material is attached to the base of the small-diameter portion 2, and the thin-diameter portion 2 is formed in a tapered shape so that the cap chip is prevented from coming off on the tapered surface. The ring-shaped concave groove 5 has a characteristic configuration. With such a configuration, even if the removal tool 10 hits when removing the cap chip, it is possible to effectively prevent the shank 1 from being damaged, and to effectively prevent the cap chip 3 from falling off during use. Is possible.
In particular, in the case of a new material such as a recent high-tensile steel plate, the cap-shaped chip 3 can be prevented from falling off even under severe usage conditions by the ring-shaped concave groove 5 for preventing the cap chip from being removed. The reinforcing ring 4 can effectively prevent breakage of the shank 1 even when the cap chip is replaced, and can exhibit excellent usability.
[0012]
【The invention's effect】
As is clear from the above description, the present invention prevents the shank from being damaged when the cap chip is removed, or prevents the cap chip from falling off and can be used continuously for a long period of time.
Therefore, the present invention contributes greatly to the development of the industry as an electrode tip for spot welding that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a front view showing a process of removing a cap chip.
FIG. 3 is a cross-sectional view showing an embodiment of the present invention.
FIG. 4 is a front view showing another embodiment.
FIG. 5 is a cross-sectional view of a main part showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shank 2 Small diameter part 3 Cap chip 4 Reinforcing ring 5 Ring-shaped groove 10 Removal tool

Claims (2)

The small diameter portion is formed at the distal end of the tubular shank, the electrode tip for spot welding fitted cap chip to the small diameter portion, from high hardness material of beryllium copper alloy or high-speed steel alloy at the base of the small-diameter portion An electrode tip for spot welding, wherein a reinforcing ring for preventing damage to the shank when the cap tip is removed is press-fitted and attached. 2. The electrode tip for spot welding according to claim 1, wherein the narrow-diameter portion is formed in a tapered shape, and a ring-shaped concave groove for preventing cap chip removal is formed on the tapered surface.

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