硅铝丝引线键合参数化建模仿真

Parametric Modeling Simulation for AlSi Wire Bonding

拉力测试是检验引线键合强度的常用手段。为了更好地研究硅铝丝在拉力测试过程中的受力情况,结合力学理论模型、三维有限元仿真模型和实验数据对比,分析了相关键合参数和初始塑性变形的情况。在拉钩上升过程中,拉力先变大、后变小,伴随着引线的颈缩。在水平方向上,弧线的最高点距离第一焊点越近,拉脱力越大。在弧线水平跨距不变的情况下,弧高变大时,拉脱力也变大。与实验数据相比,仿真模型的准确性达到了95%,为硅铝丝引线键合工艺提供了快速和准确的评估方法。

Wire bonding strength is usually examined by wire pull test.To study the stress and strain during pull test for AlSi wire bonding,the bonding parameters and the initial plastic strain effect are investigated by combining the mechanical theory model,three-dimensional finite element simulation,and experimental data comparison.In the process of pulling the hook up,the pulling force becomes larger and then smaller,accompanied by the necking of the lead.In the horizontal direction,the closer the highest point of the arc is to the first welding spot,the greater the maximum pull force.With the same horizontal wire span,the pull force increases with the increase of loop height.Compared with the experimental data,the prediction accuracy of the simulation model reaches 95%,which provides a rapid and accurate evaluation method for the lead bonding process of AlSi wire.