Resistance welding method adopting piezoelectric actuator to assist pressure applying

Abstract

The invention discloses a resistance welding method adopting a piezoelectric actuator to assist pressure applying. The piezoelectric actuator pushes a motion end head to realize another-level pressurepushing device except from conventional gas cylinder / servo / other pressure applying ways, and the pressure pushing device is coaxially arranged in a ring-shaped electrode; and a parallel / series pressure applying way is regulated through length of the motion end head, and the motion end head extends out from the inner part of the ring-shaped electrode, so that a resistance spot-welding method adopting two-stage pressure drive is formed. The method can control welding quality in stages, and the piezoelectric actuator vibrates at high frequency at a pre-pressure stage to realize effect of clearing an oxide film; at an electrifying welding stage, the piezoelectric actuator vibrates at high frequency at an electrifying welding stage to realize molten pool stirring effect and crystalline grain refining effect; at a power-off forging and pressing stage, the piezoelectric actuator vibrates at high frequency to realize stress relief effect, so that quality of a welding spot can be effectively strengthened; and meanwhile, the resistance welding method easily realizes automation, and improves production efficiency.

Description

technical field [0001] The invention relates to a novel composite high dynamic control method for electrode pressure in resistance welding (including but not limited to resistance spot welding and seam welding), and belongs to the field of welding methods. Background technique [0002] Resistance welding is a kind of pressure welding, including spot welding, seam welding, projection welding and other specific forms. The two most critical factors of its welding quality are the regulation of electrode pressure and welding current waveform. Among them, resistance spot welding has long been dominant in the assembly and manufacture of automobile body-in-white due to its advantages of high efficiency, low cost, and ease of automation. It puts forward higher requirements and new challenges to the resistance spot welding process. The following content takes the resistance spot welding process as a typical carrier to illustrate the idea and implementation method of the present inven...

AI Technical Summary

Problems solved by technology

It can be seen that the traditional electric servo pressurization method is still unable to realize the programmable control of the pressure during the welding power-on process in a short time

[0005] In order to solve the problem of insufficient dynamic response of traditional resistance spot welding pressure loading, the present invention, on the basis of traditional resistance spot welding machine pneumatic / servo pressurization, invents a new "macro-micro composite pressure programming control" method, that is, the macro pressure is controlled by the traditional Provided by pressurization, the piezoelectric actuator drives the electrode tip to provide high dynamic microscopic composite pressure during the welding process

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