电阻点焊中电极位移的测量方法分析

简述了电阻点焊中传统的电极位移测量方法,包括直接测量方法、上电极运动测量方法和长臂工装测量方法.通过有限元方法分析了焊钳在设定电极力和动态电极力作用下的变形,并分析了该变形对上电极运动测量方法和长臂工装测量方法的影响.结果表明,因动态电极力的影响,使焊钳发生变形以及下电极发生相对较大垂直位移和偏转角,从而使上电极运动测量方法和长臂工装测量方法均无法准确测量电极位移值.最后提出了梯形关系的电极位移测量方法.

Analysis of electrode displacement measurement method in resistance spot welding

The traditional methods to measure the electrode displacement in resistance spot welding include direct measurement method, measurement of upper electrode movement, and measurement of long arm tooling. The deformation of welding tongs was analyzed by finite element method(FEM) under the load of electrode force and dynamic electrode force. And the deformation influence on measurement method of upper electrode movement and measurement method of long arm tooling was analyzed. It is concluded that the lower electrode has relative larger vertical displacement and deflection angle for dynamic electrode force, so the electrode displacement cannot be measured correctly using measurement method of upper electrode movement and measurement method of long arm tooling. At last, the method to measure electrode displacement was proposedbased on trapezoidal relationship.