复杂铸造工艺装配体有限元网格划分关键技术研究

Study on the Finite Element Mesh Generation Method for Complicated Casting Process

铸造CAE技术是预测铸造缺陷、改进铸造工艺的有效方法,但其应用推广仍受到有限元网格划分技术的制约,许多复杂铸造工艺因为无法顺利地生成出合格的有限元网格而不能进行铸造CAE计算分析。本文提出了一种适用于任意复杂铸造工艺的有限元网格生成方法,并详述其中用到的关键技术和方法,包括隐式曲面几何描述方法、有限元网格尺寸智能化计算方法,以及有限元网格自动生成和网格质量优化方法。基于此算法,开发了有限元四面体网格划分前处理模块,能够为复杂铸造工艺的几何模型一键生成合格有限元网格,为铸造CAE技术的进一步推广和应用提供重要的技术保障。

CAE for Casting is an effective method for the defects prediction and the process improvement. However,failure of mesh generation for complicated casting process prohibits further popularization and application of CAE techniques. This paper presents a finite element mesh generation method for the any complicated casting process and details the critical techniques and methods,i.e. implicit surface for geometry description,calculation method for mesh size function,as well as mesh generation and optimization method. Based on this mesh generation method,a finite element mesh generator has been developed,which is capable to mesh the assembly of complicated casting process by just one click. It is believed that the present method will accelerate the spread of CAE technology.