Method of assembling a lower electrode mechanism for welding and lower electrode mechanism for welding

Abstract

The present invention reliably prevents the generation of welding defective products while minimizing and simplifying a lower electrode mechanism used in combination with an upper electrode mechanism. In a method of assembling a lower electrode mechanism, after a support tube and an electrode holder are integrally assembled, a cylindrical assembly case is inserted into the support tube from the bottom to align an elongated hole of the support tube with an elongated hole of the assembly case to assemble them. The rod assembly is inserted into the tube from the upper part of the electrode holder to fix the rod assembly inside of the assembly case in the support tube. The lower end of the rod of the rod assembly is placed to a position visible through the elongated hole of the support tube. A protruding bar is inserted into the support tube through the elongated hole of the support tube, the base end of the protruding bar is fixed to the lower end of the rod, and the slide sensor is attached to the support tube while the distal end of the protruding bar and detector of the slide sensor are connected.

Description

technical field [0001] The present invention relates to a method for reducing and simplifying the lower electrode mechanism and reliably preventing welding defective products in resistance welding in which welding is carried out by applying pressure while clamping an object to be welded. A technique in which the lower electrode mechanism is used in combination with the upper electrode mechanism. Background technique [0002] As a technique for reducing the height of the lower electrode mechanism in resistance welding and further miniaturizing it, the present inventors proposed a technique of slightly shifting the slide sensor for detecting the lifting stroke of the positioning pin laterally from the axis of the positioning pin (For example, see Patent Document 1.). [0003] In this technology, a compression spring is arranged around a rod extending downward from the positioning pin so that the positioning pin is always biased upward, and a slide sensor is attached to a sens...

AI Technical Summary

Problems solved by technology

[0007] In addition, in the above-mentioned technique, since heat is generated around the lower electrode during welding, dew condensation may occur around the motor itself or the rod under weather conditions with high humidity, and the dew condensation may affect the slide sensor. Bad influence, there is a bad situation that the stroke detection accuracy is reduced and the welding quality is badly affected

Moreover, even if the user wants to replace the slide sensor, it is difficult to connect the detection part of the slide sensor to the lower end of the rod unless the manufacturer is the manufacturer, so there is also a problem that it cannot be easily replaced on the spot.

Images