超声波焊接技术在继电器塑料壳体连接中的应用

Application of Ultrasonic Welding Technology in Relay Plastic Housing Connection

在简述了超声波焊接技术基本理论的基础上,分析了超声波焊接技术的优越性。对于继电器壳体和基座焊接而言,焊接的强度是影响其使用性能的主要因素。以聚对苯二甲酸丁二醇酯(PBT)为继电器壳体材料,聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯共聚物(ABS)为基座材料,制备相应材料试件并进行焊接试验,分析了焊接时间、超声波振幅、延迟时间和保压时间对焊接强度的影响,并获得了异种材料焊接的最佳工艺参数。结果表明,随着焊接时间的增加,试件所能承受的最大拉力表现为先升高后下降的趋势;超声波振幅越大,焊接强度越高;延迟时间和保压时间对焊接强度的影响较小,几乎可以忽略。根据试验获得的最佳工艺参数,设计了继电器壳体焊接区域结构。焊接后继电器壳体与基座连接强度和密封性能良好,工艺稳定性可以满足生产要求。

Based on the basic theory of ultrasonic welding technology, the superiority of ultrasonic welding technology was analyzed. For relay housing and pedestal welding,the strength of the weld was a major factor affecting its performance. Taking PBT as relay housing material and PC/ABS as base material,the corresponding material test pieces were prepared and welded test,the effects of welding time,ultrasonic amplitude,delay time and dwell time on welding strength were analyzed,and the best process parameters for welding of dissimilar materials were obtained. The results show that the maximum tensile force of the specimen could provide an increasing trend firstly and then decrease with the increase of welding time. As the increase of ultrasonic amplitude,the welding strength could be higher. Delay time and dwell time have little effect on weld strength,which is almost negligible. According to the optimal process parameters obtained from the test,the welding shell structure of the relay shell is designed. After welding,the relay housing and the base have good connection strength and sealing performance, and the process stability can satisfy the production requirements.