JPH0577053A - Resistance welding machine - Google Patents

Abstract

PURPOSE:To weld a weldment weak in mechanical strength in a stable state by respectively setting a stopper to an electrode and a micrometer to the other electrode. CONSTITUTION:When an upper electrode holder 6 is lowered and the micrometer 8 comes into contact with the stopper 4, the interval between the lower electrode 3 and the upper electrode 7 is adjusted by a micrometer 8 in advance. Then, after the material 2 to be welded and a weldment 1 are mounted on the lower electrode 3, the upper electrode holder 6 is lowered and brought into contact with the micrometer 8. In this way, the upper electrode 7 presses and welds the weldment 1. In a time of welding, the interval between the lower electrode 3 and the upper electrode 7 can be set by adjusting the micrometer 8. Consequently, even to a weldment 1 weak in mechanical strength, it is possible to perform welding fitted to the mechanical strength of the weldment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding machine, and more particularly to a resistance welding machine suitable for welding a welded product having elastic force.

[0002]

2. Description of the Related Art A conventional resistance welding machine, as disclosed in, for example, Japanese Patent Laid-Open No. 186287/1991, applies a pressing force required for welding by a compression coil spring.

[0003]

In the above-mentioned prior art, since the welding pressure is obtained by the compression coil spring, it is difficult to adjust the minute pressure. Therefore, for example, in the case of welding a heater coil for an impregnated cathode of an electron gun to a heater support, a welded material (heater coil) having a weak mechanical strength can be welded stably without being crushed. I couldn't.

An object of the present invention is to provide a resistance welding machine capable of stably welding a welded product having weak mechanical strength.

[0005]

In order to achieve the above-mentioned object, two openable and closable electrodes arranged opposite to each other, a stopper attached to one electrode, and a stopper attached to the stopper are provided. A micrometer attached to the other electrode is provided, and the elastic force of the welded material is used as a pressing force.

[0006]

Since the stopper is attached to one electrode and the micrometer is attached to the other electrode, the distance between both electrodes can be adjusted by adjusting the micrometer. Therefore, when the micrometer is brought into contact with the stopper, both electrodes cannot approach each other beyond a certain fixed interval. That is,
The distance between both electrodes can be adjusted so as not to crush the welded object, and at the same time, a pressing force according to the elastic force of the welded object can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Lower electrode 3 supporting the welded article 1 and the welded article 2
Are fixed to the stopper 4. A guide shaft 5 is fixed to the stopper 4, and an upper electrode holder 6 is vertically movably fitted into the guide shaft 5. An upper electrode 7 is fixed to the upper electrode holder 6 so as to face the lower electrode 3, and a micrometer 8 is fixed so as to face the stopper 4. Further, the upper electrode holder 6 is urged by a spring 9 in a direction in which the upper electrode 7 is separated from the lower electrode 3, and is in contact with the stopper 10.

Next, the operation will be described. 1 shows a state before welding, and FIG. 2 shows a state after welding. As shown in FIG. 2, the distance between the lower electrode 3 and the upper electrode 7 when the upper electrode holder 6 is lowered to bring the micrometer 8 into contact with the stopper 4 is adjusted in advance by the micrometer 8.

Therefore, as shown in FIG. 1, after the work piece 2 and the work piece 1 are placed on the lower electrode 3, the upper electrode holder 6 is lowered and the micrometer 8 is set as shown in FIG. Abut the stopper 4. As a result, the upper electrode 7 presses the welded article 1. Weld in this state.

As described above, the lower electrode 3 during welding
Since the distance between the upper electrode 7 and the upper electrode 7 can be adjusted by adjusting the micrometer 8, it can be adjusted in advance so as not to crush the welded material 1. Further, the welding pressure required for welding can be obtained from the elastic force of the heater coil when the welded article 1 is a heater coil. For this reason, even a welded material 1 having a weak mechanical strength can be welded according to the mechanical strength of the welded material 1. Further, even with a sufficiently small pressing force, fine adjustment can be performed by the micrometer 8.

As the micrometer 8, a commercially available micrometer can be used. In the case of a commercially available micrometer, the tip end that abuts the stopper 4 is flat. At this time, the flatness of the facing portion of the stopper 4 needs to be processed relatively accurately. On the other hand, if the tip of the micrometer is processed into a spherical shape, the facing portion of the stopper 4 can be processed relatively easily.

[0012]

According to the present invention, it is possible to stably weld an object having a weak mechanical strength such as a heater coil without crushing. In addition, even a sufficiently small pressure can be finely adjusted with a micrometer.

[Brief description of drawings]

FIG. 1 is a front view before welding showing an embodiment of a resistance welding machine according to the present invention.

FIG. 2 is a front view of the resistance welding machine of FIG. 1 during welding.

[Explanation of symbols]

 1 Welded object 2 Welded object 3 Lower electrode 4 Stopper 7 Upper electrode 8 Micrometer

Claims (1)

[Claims] 1. An openable and closable two electrode, a stopper attached to one electrode, and a micrometer attached to the other electrode facing the stopper. A resistance welding machine characterized in that the elastic force of the welded material is used as a pressing force.