电阻点焊应变式压力传感器弹性体的设计及应用

针对电阻点焊压力的在线监测,根据电阻点焊电极受力分析结果,提出通过缩短压力传感器与电极间的安装距离、减少受力不平衡带来的测量误差的方法。设计可直接安装在下电极及其电极握杆之间的应变式压力传感器,并对其弹性体进行设计计算。测试结果表明,该传感器能够实时测量电阻点焊过程中的电极压力,及时响应点焊熔核形成过程压力的瞬时变化,可间接预测熔核大小、监测焊接过程中的飞溅。

Design and application of the elastomer of resistance spot welding strain type pressure sensor

For the online monitoring of electrode force in resistance spot welding,according to the force analysis results,a method making use of shortening the mounting distance between the pressure sensor and electrode to reduce the measurement error caused by the unbalanced force is proposed.A strain type pressure sensor which can be directly arranged between the lower electrode and the electrode holder is designed,and the design and calculation of its elastomer are completed.The test results show that the sensor can measure the electrode pressure in the resistance spot welding process in real time,timely response to the transient changes of pressure in nugget formation process,indirectly predict the size of the nugget and monitor the splash during the welding.