JP2665578B2 - Spot welding electrode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding electrode.

[0002]

2. Description of the Related Art As shown in FIG. 4, an electrode for spot welding is composed of a shank 51 having a through hole 52 for a cooling water passage having a central axial direction and a tip 53 fitted and fixed to the tip thereof.

[0003] The chip 53 is a consumable item and must be frequently replaced with a new one. When exchanging the tip 53, it is performed by shutting off the water channel, but it was not possible to avoid the occurrence of water leakage.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a chip exchange.
Water leakage does not occur at the time, etc.
It is an object to make it easy to perform.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems
Means adopted by the present invention is a bottomed bottom through which cooling water flows.
Cap-shaped tip 30 is detachably attached to the tip of the shank 20
The cap- shaped tip 30 is fitted with the shank 30
When externally fitted to the space, a space 60 formed between the two
In order to communicate with the outside, a small
The point is that the groove 31 is formed.

[0006]

Therefore, for spot welding characterized by the above configuration.
The cap-shaped tip 30 at the electrode is fitted over the shank 20
Is attached to the inner peripheral surface of the cap-shaped chip 30.
When the tip 30 is externally fitted to the shank 20,
A small groove 3 that allows the space 60 to be formed to communicate with the outside.
1 is formed, the space is formed through the small groove 31.
The fluid in the section 60 is supplied and discharged to the outside . Ma
In addition, since the shank 30 has a bottomed tip, a cap shape
Cooling water does not leak outside when the tip 30 is replaced.
No.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hollow rod-shaped shank 20 has an opening at the base end, and a projection 22 is formed at the tip end by fitting a member with a copper projection in a liquid-tight manner and then welding 25. Convex part 22
Copper galea chip 30 is fitted, electrode rod 10 is configured to. In addition, the cap-shaped tip 30 is removed from the shank 20.
When fitted, the inner peripheral surface of the cap-shaped tip 30 and the shank 3
So that the space 60 formed between the zeros communicates with the outside.
At least one small groove 31 extending from the upper edge of the inner surface of the concave portion to the vicinity of the bottom surface of the concave portion is provided.

When the shank 20 is mounted on a holder (not shown), a water pipe 41 extending from the holder forms a shank 20.
And reaches the vicinity of the inner surface of the projection 22. Sha
Since the tip of the ink 20 is closed, the water flows from the water pipe 41.
The discharged cooling water flows through the inside of the shank 20 and
No leakage occurs. In fixing the concave portion of the cap-shaped chip 30 to the convex portion 22 so as to be detachable, the convex portion 22 may be provided with a gentle taper 21 and the cap-shaped chip 30 may be press-fitted .

When the concave portion of the cap-shaped chip 30 is detachably fixed with a lubricant 23 interposed outside the convex portion 22, the detachment becomes easy. In addition, the cap-shaped chip 30 is provided with a small groove 31.
Therefore, the air in the space 60 is reduced through the small groove 31.
Fluids such as oil and lubricants will be supplied and discharged to the outside.
Therefore, it is possible to provide the convenience of loading and unloading of the cap-shaped chip 30.
You.

[0010] Note that lubricant 23 is carbon and is conductive lubricant is preferred, such as a mixture of grease, protrusions 2 partially broken grease thin layer in the press fit state in grease alone
2 and the cap-shaped chip 30 are in close contact with each other, and the electrical conductivity is maintained.

When a member made of copper and having a convex portion is fixed to the hollow rod-shaped shank 20 after being fitted in a liquid-tight manner, fixing means other than welding can be used.

[0012]

As described above, the spot melting according to the present invention is performed.
The contact electrode is used when the cap-shaped tip is replaced or inadvertently removed.
To obtain the effect that the water in the shank does not leak to the outside
Can be.

Further , the inner peripheral surface of the chip communicates with the outside.
Because the small groove is formed, the inner peripheral surface of the chip
The fluid in the space formed between the tips of the
From the outside to the outside.
This has the effect that it can be used for the convenience of work. The present invention is useful for reducing the cost of chips and facilitating chip replacement even when applied to a shank with a non-water channel.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a spot welding electrode according to the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a vertical sectional front view of a spot welding electrode in a conventional example.

[Description of Signs ] 20 ... Shank 30 ... Cap-shaped tip 31 ... Small groove 60 ... Space

Claims (1)

(57) [Claims] 1. A shank having a bottom through which cooling water flows.
When the cap-shaped tip (30) is detachably fitted to the tip of (20)
In both cases, the cap-shaped tip (30) is externally fitted to the shank (30).
The space (60) formed between them and the outside
A small groove (31) is formed on the inner surface of the cap-shaped tip (30)
An electrode for spot welding characterized by being formed .