JP3228334U - Electrode structure for bolt welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a situation in which an insulating pipe for preventing contact between a bolt shaft portion and an electrode is forgotten to be inserted when welding a weld bolt, and at the same time to simplify the work setup, an electrode structure for bolt welding. I will provide a. SOLUTION: An electrode main body 2a having a through hole h and an insulating pipe 2b which is fitted and integrated in the through hole h and whose inner diameter x is smaller than the inner diameter y of the electrode main body are prepared, and the insulating pipe 2b is provided. The O-ring r arranged around the through hole h of the electrode body 2a prevents it from coming off. Further, the lower end portion of the insulating pipe 2b is made to project below the lower end portion of the electrode body 2a. [Selection diagram] Fig. 2

Description

The present invention relates to a technique for preventing a situation in which a bolt shaft portion comes into contact with an electrode during welding and causes a problem in welding of a weld bolt or the like.

Conventionally, in welding a weld bolt, a through hole formed in an electrode is inserted through the shaft portion of the bolt during welding, but at this time, when the shaft portion of the bolt comes into contact with the inner surface of the through hole, Since sparks and the like are generated in the contact portion and the screw thread is damaged, and the welding current is diverted to cause welding failure in the weld portion, a technique for preventing this is known. .. (See, for example, Patent Document 1.)
As shown in FIG. 4, this technique provides a step d on a part of the inner surface of the through hole 51h of the electrode body 51, inserts an insulating sleeve 52, and hooks the step d to prevent the electrode body 51 from falling off downward. I am doing it.

Utility Model Registration No. 3209901.

However, in the above technique, since the electrode body 51 and the insulating sleeve 52 are not integrated, a situation may occur in which the insulating sleeve 52 is forgotten to be inserted and welding work is performed, or the work setup becomes troublesome. There was such a problem. Moreover, when the bolt shaft becomes long, the bolt shaft may come into contact with a conductive portion other than the electrode.

Therefore, the present invention aims to solve the above-mentioned problems.

In order to achieve the above object, the present invention provides an electrode body having a through hole and an electrically insulating insulating pipe that is fitted into the through hole and integrated in the electrode structure for bolt welding. The inner diameter of the is smaller than the inner diameter of the through hole, and the insulating pipe is prevented from coming off by an O-ring arranged around the through hole of the electrode body.

In this way, if the insulating pipe is prevented from coming off by using an O-ring, the electrode body and the insulating pipe can always be integrated in spite of the extremely simple structure, and the problem of forgetting to insert can be prevented, and the welding work Setup becomes easier. At this time, since the inner diameter of the insulating pipe is smaller than the inner diameter of the through hole of the electrode body, there is no possibility that the bolt shaft comes into contact with the electrode.

At this time, by projecting the lower end of the insulating pipe below the lower end of the electrode body, even if the shaft of the bolt is long, there is no risk of contact with conductive parts other than the electrode, and the screw It is possible to completely prevent damage to mountains and poor welding.
Further, as the insulating pipe, it is preferable that the conductive pipe is coated with an electrically insulating insulating material, or the material is ceramics, bakelite containing cloth, resin, or special stainless steel (KCF).

As an electrode structure for bolt welding, the insulating pipe is integrated by an O-ring arranged around the through hole of the electrode body, and the insulating pipe is prevented from coming off, so that the electrode body and the insulating pipe are always integrated. This makes it possible to prevent problems such as forgetting to insert the pipe, and facilitates the setup of welding work. At this time, by projecting the lower end of the insulating pipe below the lower end of the electrode body, damage to the threads and poor welding can be completely prevented. Further, as the insulating pipe, it is preferable that the conductive pipe is coated with an electrically insulating insulating material, or the material is ceramics, bakelite containing cloth, resin, or special stainless steel (KCF).

It is an overall view for demonstrating the state of weld bolt welding. (A) is a vertical cross-sectional view of the main electrode structure, and (b) is a partial view of a portion where the main electrode is attached to the electrode holder. (A) is a state diagram in which the work is set, and (b) is a state diagram at the time of welding. The conventional state is shown, (a) is a perspective view before setting, and (b) is a vertical sectional view at the time of setting.

An embodiment of the present invention will be described.
The electrode structure for bolt welding according to the present invention prevents a situation in which an insulating pipe for preventing contact between the bolt shaft and the electrode is forgotten when welding a weld bolt, and at the same time, the work is set up. It is a technique for simplifying the above, and is characterized in that an electrode composed of an electrode body and an insulating pipe is integrated with an O-ring.

Therefore, first, the outline of the welding work of the weld bolt will be described with reference to FIG.
In the work of welding the weld bolt B to the work W of a steel plate or the like, as shown in FIG. 1, a perforated work W is placed on the lower electrode 2 having a through hole h of the lower electrode mechanism 1, and the weld bolt is bolted. After inserting and setting the shaft portion of B through the hole of the work W and the through hole h of the lower electrode 2, the upper electrode 3 waiting above is lowered to lower the lower surface of the head of the weld bolt B to the upper surface of the work W. A high-pressure current is passed between the upper electrode 3 and the lower electrode 2 to weld the lower surface of the head of the weld bolt B and the upper surface of the work W.
Incidentally, the lower electrode 2 is mounted on the upper end portion of the electrode holder 4, and in the electrode holder 4, a cylinder rod 5a, which will be described later, is always urged upward by a lower cylinder unit 5. A receiving seat 6 integrated with the cylinder rod is built in.

In such welding work of the weld bolt B, if the shaft portion of the bolt B comes into contact with the inner surface of the through hole h of the lower electrode 2 or the surrounding conductive portion during welding, sparks or the like are generated at the contact portion and the screw is screwed. As described above, problems such as damage to the ridges and the divergence of the welding current leading to poor welding of the weld portion occur.

Therefore, in the present invention, the lower electrode 2 is configured as an integral body of the electrode body 2a having excellent conductivity and the insulating pipe 2b arranged in the through hole h of the electrode body 2, and the shaft portion of the weld bolt B is formed. Is prevented from coming into contact with the through hole h of the electrode body 2a having excellent conductivity, and the state thereof will be described with reference to FIG.

As shown in FIG. 2A, the lower electrode 2 structure is mounted on an electrode body 2a having a through hole h and an O-ring groove formed near the lower end of the through hole h of the electrode body 2a. It is composed of an O-ring r and an insulating pipe 2b of an electric insulation guard that is attached by the O-ring r to prevent it from coming off, and the inner diameter x of the insulating pipe 2b is slightly smaller than the inner diameter y of the electrode body 2a. Has been done.
Further, since the lower end of the insulating pipe 2b extends downward from the lower end of the electrode body 2a, the bolt shaft comes into contact with a conductive portion other than the electrode body 2a even when the shaft portion of the bolt B is long. There is no such problem.

Further, the insulating pipe 2b is made of a conductive pipe coated with an electrically insulating insulating material, or made of ceramic, cloth-containing bakelite, resin, or special stainless steel (KCF).

On the other hand, the state in which the lower electrode 2 is attached to the lower electrode mechanism 1 as described above is as shown in FIG. 2B. In this case, the cylinder rod described above is contained in the electrode holder 4 of the lower electrode mechanism 1. 5a and a seat 6 are built-in, and in this embodiment, a protrusion protrudes on the seat 6, and an adjuster suitable for the type of weld bolt B (length of the shaft portion) is formed on the seat 6. The member 7 (a recess that can be fitted is formed in the protrusion on the seat 6) is inserted and set.

Next, the welding work procedure in the above apparatus configuration will be described with reference to FIG.

As shown in FIG. 3A, a perforated work W and a weld bolt B are set on the lower electrode 2. At this time, a gap having a predetermined size is formed between the lower surface of the head of the weld bolt B and the upper surface of the work W.

Next, the upper electrode 3 begins to descend and presses the head of the weld bolt B downward. Then, when the lower surface of the head of the weld bolt B and the work W come into contact with each other (FIG. 3B), it is determined whether or not the bolt B is a regular bolt B, and when it is determined that the bolt B is a regular bolt B. , A high voltage current flows between the upper electrode 3 and the lower electrode 2, the weld portion is melted, and welding is performed.
Incidentally, when the lower surface of the head of the weld bolt B and the work W come into contact with each other, the pressing force of the upper electrode is larger than the upward urging force of the cylinder rod 5a, so that the weld portion of the lower surface of the head of the weld bolt B Is pressed against the upper surface of the work W with a constant force, and is energized and welded in that state.

In the lower electrode mechanism 1 as described above, the method of inserting and mounting the electrically insulating adjuster member 7 on the upper part of the seat 6 is not an essential requirement for welding the weld bolt B.

In the welding work as described above, in the lower electrode 2, the electrode body 2a and the insulating pipe 2b are integrated by the O-ring r, so that the insulating pipe 2b is not forgotten to be inserted and the work setup is simplified. In addition, since the lower end of the insulating pipe 2b projects below the lower end of the electrode body 2a, damage to the threads and poor welding can be completely prevented.

The present invention is not limited to the above embodiments. Those that are substantially the same as the matters described in the claims for utility model registration of the present invention and that have the same effects and effects belong to the technical scope of the present invention. For example, the position of the O-ring r arranged around the through hole h of the electrode body 2a is arbitrary.

It is expected that weld bolts will be widely used in the welding field.

2 ... Lower electrode, 2a ... Electrode body, 2b ... Insulated pipe, h ... Through hole, r ... O-ring, x ... Inner diameter of insulated pipe, y ... Inner diameter of through hole.

Claims (3)

It is an electrode structure for bolt welding and includes an electrode body having a through hole and an electrically insulating insulating pipe that is fitted and integrated into the through hole, and the inner diameter of the insulating pipe is the inner diameter of the through hole. The electrode structure for bolt welding is characterized in that the diameter is made smaller and the insulating pipe is provided with an O-ring arranged around the through hole of the electrode body to prevent it from coming off. The electrode for bolt welding according to claim 1, wherein the lower end portion of the insulating pipe projects below the lower end portion of the electrode body. The insulating pipe is characterized in that the conductive pipe is coated with an electrically insulating insulating material, or the material is ceramics, bakelite containing cloth, resin, or special stainless steel (KCF). The electrode structure for bolt welding according to claim 2.

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