基于AutoCAD的SMT焊点三维形态数据处理技术

针对SMT焊点形态预测模型和焊点力学性能与可靠性分析模型不统一的现象,在利用VBA技术对AutoCAD进行二次开发和对SurfaceEvolver软件预测的焊点三维形态有限元数据进行分析的基础上,对SurfaceEvolver软件预测的焊点三维形态模型到ANSYS实体模型的转换方法进行了研究。编制了模型转换程序,并以218节点PBGA焊点三维形态预测模型为例,进行了应用实例转换,得到了较为满意的转换结果。模型的成功转换,实现了焊点形态预测模型和焊点力学性能与可靠性分析模型的统一,推进了SMT焊点形态预测的实用化进程。

A Study on the Data Processing of SMT 3-D Solder Joint Shape Based on AutoCAD

Given the difference between the SMT solder joint shape predicting model and the mechanical behavior and reliability analyzing model,and based on the second development of AutoCAD resulted from the application of VBA and the analysis of the FEM(Finite Element Method)data of 3-D(three dimensional)solder joint shape predicted by Surface Evolver,the method of converting the model of 3-D solder joint shape predicted by Surface Evolver to the solid model of ANSYS was studied.And the program of model converting was achieved.Then,an example of PBGA(Plastic Ball Grid Array) model of 3-D solder joint shape with 218 vertexes predicted by Evolver was converted successfully by the program,which could show the feasibility of the method.The successful converting unites the solder joint shape predicting model with the mechanical behavior and the reliability analyzing model of the solder joint.And finally,it advanced the practical course of the predicting for SMT solder joint shape.