超声波塑料焊接临界温度场分析  

Analysis on critical temperature field during ultrasonic welding of thermoplastics

作　　者：张宗波[1] 贺庆强[1] 罗怡[2] 王晓东[2] 王立鼎[2] 

机构地区：[1]中国石油大学(华东)机电工程学院,青岛266580 [2]大连理工大学辽宁省微纳米技术及系统重点实验室,大连116024

出　　处：《焊接学报》2016年第1期20-22,130,共3页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51205414);中央高校基本科研业务费专项资金资助项目(14CX02199A;14CX02070A);辽宁省重点实验室开放基金资助项目(20110301);青岛市科技计划基础研究资助项目(13-1-4-257-JCH)

摘　　要：采用多场耦合模型对超声波塑料焊接过程中的摩擦热和粘弹热进行了数值计算,并分析了超声振幅对焊接区温度场的影响.基于计算结果,提出了超声波焊接过程存在临界振幅,当超声振幅低于该临界振幅时,不管焊接时间多长,都不能形成熔融焊接区.制备了相应的试件并搭建测温系统对焊接过程进行测温试验,试验结果与数值计算结果具有较高一致性,进一步对临界振幅附近的临界温度场进行了分析和探讨.研究临界温度场,有助于解决超声波塑料焊接过程中温度场难以控制的难题,同时为超声波塑料器件非熔融连接方法奠定基础.The heat induced by friction and viscoelastic effect in the ultrasonic welding thermoplastics was calculated via multi-physics coupling model. Based on the calculation,influences of ultrasonic amplitude on the temperature field of weld zone were studied. Moreover,the existance of critical amplitude,below which the thermoplastic would not flow,was discovered during ultrasonic welding. Temperature-measurement test was carried out to verify the simulation. The simulation results agreed well with experiment results. And the temperature field under critical amplitude was discussed. The study of critical temperature field in this paper will contribute to solving the problem of temperature controlling during ultrasonic welding and to laying the foundation for non-melting joining of thermoplastics using ultrasonic vibration.

关 键 词：超声波塑料焊接 临界振幅 临界温度场 

分 类 号：TG456[金属学及工艺—焊接]