采用Bézier曲面生成叶片锻造三维有限元模拟的模具网格

A Method for Generating Die Meshes for 3-D FEM Simulation of Blade Forging by Bézier Surface

根据叶片锻模的特点提出采用 Bézier曲线将叶片锻造三维有限元模拟的模具上分散的点分组拟合成曲面块 ,并同时对各拟合出的 Bézier曲面块进行网格划分 ,进而拼接后形成模具网格 ,从而为方便地处理模拟过程中模具和坯料间的摩擦问题和动态接触问题打下了一定的基础。

In order to deal with the friction condition and the contact boundary condition between the billet and the die in the forging process of blade, according to the features of blade geometry and its dies, we first fit the dots scattering on the die into a group of Bézier surface patches with meshes (Fig.1). Then, these surface patches are joined into a whole die surface mesh (Fig.2). We applied this method to the generation of blade die meshes as shown in Figs.3 and 4. They show that the blade die meshes generated by our method can satisfy the requirements of 3 D FEM simulation. Our method can also be used to generate the die meshes of other kinds of parts.