| Sheet metal forming simulation of FEA efficiently analyze the transforming of the sheet metal forming process and microstructure, and material destroy mechanism, optimize and improve the die design and manufacture process, shorten the time of designing and manufacturing, reduce manufacturing cost, and improve the manufacture quality of die, so it is applied extensively in sheet metal forming process.According to the requirements of finite element simulation of sheet forming, this paper analyzes the functions of pre-processor, simulation solver and post-processor of finite element simulation of sheet metal forming. The elements and the function requirements of preprocessing system and the requirement to mesh of FEA are mainly discussed. A method to deal with the date structure of the pre-processor is analyzed to solve theses problems existing in the process of designed and organized the data structure of the pre-processing system. Mesh modeling of pre-process is the base of the FE simulation of sheet metal forming, because the quality of mesh modeling has a great effect on result of FE simulation. This paper introduces the principles of the establishment of mesh modeling and the methods of mesh generation, and the mesh modeling of FEA was built up based on STL file format. In this paper, these problems existing in the structure of the mesh model in the pre-processing system are analyzed, and the method to repair the mesh modeling based on the STL file format is mainly discussed. Mesh drawbacks have great effect on the FEA of sheet metal forming and many FE simulation softwares just manually repair these simple drawbacks. The features of mesh drawback in STL file is analyzed. A criterion to judge the correct mesh model and a boundary discriminate algorithm is proposed. And automatically discrimination and repair algorithms for some typical mesh drawbacks are achieved for the pre-processing system of FE simulation of sheet metal forming.
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