两道次板材渐进成形过程仿真与实验验证

针对渐进成形工艺加工侧壁较陡零件时板材厚度减薄严重的问题,通过建立基于ABAQUS的两道次板材渐进成形有限元模型,比较单道次与两道次成形路径下零件厚度分布和等效塑性应变历史变化规律,研究了两道次成形策略对板材成形极限的影响。结果显示,与单道次成形件相比,两道次成形件变形量最大的区域离零件底部更近,在所选A、B、C3点处的等效塑性应变最大值分别减小了66.2%、81.9%和36.0%,且板材变形更加均匀,使零件最小厚度增加了16%左右,表明两道次成形路径能大幅提高板材成形极限。经实验验证,数值模拟结果基本与实际吻合。

Numerical simulation and experimental investigation of double-stage sheet incremental forming

In order to find a method to reduce excessive sheet thinning in the forming process of small half-apex angle parts by incremental sheet forming,a finite element model(FEM) for simulating double-stage process is developed in ABAQUS.Then,the simulation results,such as sheet thickness distribution and equivalent plastic strain history,are compared with those of single-stage simulation.The effects of double-stage on formability of sheet are discussed.The results show that using double-stage process instead of s...