真空电阻凸焊温度场有限元分析

Analysis of thermal field distribution of vacuum projection welding using finite element procedures

凸焊过程中凸焊筋的温度分布直接影响凸焊筋的压溃过程,从而影响最终的焊接质量.基于ANSYS有限元分析软件,建立了用于真空电阻凸焊瞬态热过程分析的电热耦合有限元模型,分析了真空电阻凸焊的热电耦合过程,得到了焊接过程的热历程以及焊件各部位的温度分布,分析中考虑了随温度变化的材料特性参数、相变问题等.在此基础上分析了不同凸焊筋距离的双凸焊筋结构的温度场分布,得出凸焊筋距离对温度场分布的影响,为MEMS元件凸焊封装外壳的优化设计提供理论依据.

In projection welding process the temperature distribution of the projection welding tendons directly influence the projection tendon collapse process and there for influence the final welding quality of the worksheet. In this paper the author created a 2D Finite element projection welding thermalelectric model according to tlae vacuum projection welding. By analysis of couple field of vacuum projecting welding, the temperature distribution and thermal history of the components was obtained. In the analysis, temperature-related depend material property and phase change had been taken into account. Based on this analyze, we also analyze different distance of two projection welding tendons, and we concluded the that tendon distance on temperature distribute had influence. This result laid sound foundation for MEMS components package shell optimal design.