自适应精密成形工艺计算机仿真

金属成形数值仿真技术的关键是对模具及动态变化的锻件构形进行数学描述和网格自动生成。本文采用非均匀有理B样条表达模具及锻件构形 ,精确表达模具上圆弧部分 ,生成了可随误差和模具曲率而变的自适应网格 ,提高了数值仿真的精度 ,从而满足精密成形工艺仿真的要求。实现了自适应精密成形工艺计算机仿真系统 ,以法兰中温精锻成形为例验证了系统的实用性和可靠性

ADAPTIVE SIMULATION OF PRECISION FORMING PROCESS

The key technique in a numerical simulation of the metal forming process is the mathematic representation of dies and dynamic forging geometry as well as the generation of meshes. In this paper, the non uniform rational B splines are used to represent the dies and forging geometry which can represent the arcs on dies precisely. Further the adaptive meshes generated can be changed with errors and the curvature of dies. This will increase the precision of calculation and meet the precision forging process through computer simulation. The adaptive precision forming process through computer simulation is exemplified by the presision forming of flanges at middle temperature which proves the system as valid and reliable.