【摘要】 利用单片机和计算机构建了基于并口通讯的铝合金冲击波点焊工艺参数测试系统,利用LabVIEW开发了界面友好的测试系统软件。所建立的测试系统具有抗干扰强、可靠性高、采集速度和传输速度快、可扩充能力强等优点,测试系统软件不仅具有通讯、数据操作等功能,还具有数据库和数据分析功能。对所采集的点焊工艺参数曲线分析研究表明,电极电压曲线上的“塌陷”状突变信号和电极压力曲线上的高频躁动突变信号可用来识别前期喷溅,对于后期喷溅,只能利用电极压力曲线上的高频躁动突变信号来进行识别。电极压力曲线上的热膨胀上升量和锻压力下降量可用来识别未熔合及未完全熔合缺陷。更多还原

【Abstract】 An efficient data acquisition system was built to collect welding parameter of aluminum alloys shock wave resistance spot welding by using single chip processor and process computer.The communication port of the system between single chip processor and process computer is parallel port.This system have many advanlages such as better anti-jamming performance,high reliability,better expansion capacity,fast picking rate and transfer rate.The software of this system developed by LabVIEW has functions such as communication,data manipulation,the database and the data analysis function.A systematic analysis based on acquisition data shows that the earlier splash can be identified by "collapsing abrupt change" of tip voltage signal and "high frequency restlessness abrupt change" of electrode force signal,but for later splash,it can be identified only by "high frequency restlessness abrupt change" of electrode force signal. Moreover the incomplete fusion can be identified by "thermal expansion rise value" and "forging force drop value" extracting from electrode displacement.更多还原