压电致动器辅助电阻点焊工艺实现及飞溅控制  

Realization and expulsion control of piezoelectric actuator assisted resistance spot welding

作　　者：陈树君[1] 邬娜[1,2] 肖珺 卢振洋[1] CHEN Shujun;WU Na;XIAO Jun;LU Zhenyang(Engineering Research Center of Advanced Manufacturing Technology for Automotive Components,Ministry of Education,Beijing University of Technology,Beijing,100124,China;School of Machine-electricity and Automobile Engineering,Beijing University of Civil Engineering and Architecture,Beijing,100044,China)

机构地区：[1]北京工业大学智能成形装备及系统研究所,汽车结构部件先进制造技术教育部工程研究中心,北京100124 [2]北京建筑大学,北京102616

出　　处：《焊接学报》2020年第9期1-7,I0001,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金面上资助项目(51775007)。

摘　　要：电阻点焊是一种多物理场耦合且封闭不可见的金属成形过程,焊接过程中电流大且通电时间短,电极力与熔核区热熔化程度匹配不当,极易造成飞溅问题,影响表面成形并降低焊点强度.针对此问题,文中提出了一种压电致动器辅助电阻点焊的方法,利用压电致动器自身响应时间短、输出推力大的特点,将压电致动器辅助压力施加于焊接过程,实现电阻点焊过程中宏观静压力与压电致动器辅助快速动态可编程压力调节.结果表明,压电致动器在电阻点焊气缸宏观预紧力下可实现可控的压力输出,不同频率的振动可辅助加载于原始压力波形之上,在保持焊接参数不变的情况下,压电致动器的振动输入可有效改善熔核区热分布,实现对焊接飞溅的抑制并增大熔核直径,综合提升接头性能.Resistance spot welding(RSW)is a metal forming process with multi physical field coupling and invisible.High current in a short welding duration will make improper matching between electrode force and melting of the nugget.Expulsion is a typical welding defects,it will reduce the nugget strength and the using life of the electrode cap.In this study,a piezoelectric actuator assisted resistance spot welding system was proposed and built,which benefit from short response time and high output of the piezoelectric actuator.The force from piezoelectric actuator was added on the main cylinder force during the welding process.In this way,macro static force and high dynamic programmable force regulation were realized.Experiments showed that expected piezoelectric actuator out-puts were obtained.A series of piezoelectric frequency was added into the electrode force.The oscillation of piezoelectric actuator improved the heat distribution in nugget zone.Expulsion was reduced and the nugget sizes increased significantly under the piezoelectric oscillation.

关 键 词：电阻点焊 压电致动器 压力控制 点焊飞溅 

分 类 号：TG438.2[金属学及工艺—焊接] TG453.9