基于有限元方法Ti-50A筒形件拉深成形过程研究

Study on Deep Drawing Process of Titanium Alloy Ti-50A Cylinder Part Based on Finite Element Method

通过对Ti-50A板材拉深过程的数值模拟,研究了参数选择与状态控制的基本途径,建立了对拉深过程进行数值模拟所用的几何模型。选择了壳单元为离散模型,采用映射网格划分技术对几何模型进行了网格划分,并对板料拉深数值模拟过程采用了自适应网格划分。针对Ti-50A钛合金给出了合适的材料本构模型。解决了加载、边界约束及求解过程当中最佳的时间和步长问题。利用接触理论和经典的库仑摩擦定律处理了模拟过程当中板坯与模具的接触与摩擦问题,最终完整地建立了符合实际的Ti-50A拉深成形过程数值模拟的有限元模型。通过有限元模拟与实际情况对比,验证了所提出的技术方案。

The deep drawing process of the titanium alloy Ti-50A cylinder was studied by finite element method （FEM） simulation technology in the project, Based on analysis for the deep drawing process of the titanium alloy Ti-50A cylinder, a practical elasto-plastic FEM model was established and the key technologic problems were dealt with reasonably, These problems includes the chosen of the proper constitutive equations for titanium alloy Ti-50A, contact way and the adaptive remeshing. Conducting of comparison between the finite element simulation and actual situation, the feasibility of the technical method was proved.