半球形件模具表面摩擦特性影响的数值模拟与优化设计

FE simulations and optimizations of frictional influences in different regions of dies on the formability of hemispherical parts

采用数值模拟的方法,研究拉深模具表面不同区域摩擦特性对半球形零件成形性能的影响规律。通过改变区域摩擦系数,确定内皱、拉裂两种成形缺陷及凸缘区材料流入量的主影响区。针对起皱、拉裂两种成形缺陷,分别对区域摩擦系数进行调整优化,采用优化后的摩擦特性组合,起皱的可能性降低了5.2%,拉裂的危险性降低了13%。该文研究结果可以为模具表面的激光复合造型提供依据,从而实现模具表面微观几何织构的主动设计制造。

FE simulations were performed to find out the areas where the friction has remarkable influences on the wrinkling and fracture of hemispherical parts by changing friction coefficients in different regions of dies.Two groups of friction coefficients that were approximately optimized to reduce the risk of wrinkling and fracture respectively were applied to the simulation.The simulation results demonstrate that the possibility of wrinkling and fracture are reduced by 5.2% and 13% respectively.The results could provide basis for laser composite texturing which is used in active design and manufacture of the micro-geometric texture on the surface of dies.