圆锥台单点增量成形件残余应力研究

Study on Residual Stress of Cone Part Manufactured by Single Point Incremental Forming

单点增量成形过程中残余应力分布与成形件的尺寸精度有着密切的联系。该文以圆锥台件为例,采用1060铝板,首先对残余应力方向进行定义,然后分别通过ABAQUS有限元仿真和实验验证对成形件的等效塑性应变和残余应力进行研究,并根据残余应力分布将成形件沿高度方向进行分区研究。结果表明:采用三维实体模型能准确模拟成形件的残余应力分布,成形件中残余应力主要集中在成形区,且垂向残余应力值较小;弯曲过渡区、平面伸长区和底部变形区的横向残余应力的性质由内到外依次为拉-压、压-拉、拉-压,纵向残余应力则均呈拉应力-压应力的变化。

Residual stress distribution and size precision of parts are closely related to single point incremental forming process. Tacking the conical part as an example of1060 Aluminum plate,the residual stress directions are firstly defined,then the equivalent plastic strain and the residual stress are studied and the partition according to the residual stress distribution of the forming parts along the height direction are studied via ABAQUS software and experiments. The result shows that： the residual stress distribution can be accurately simulated by using 3D solid model,the residual stress is mainly concentrated in the formed zone,and the value of residual stress in vertical direction is small; the transverse residual stress is in bending transition region,planar elongation region and the deformation zone of the bottom from the inside to the outside are tension-compression,compression-tension,tension-compression,the longitudinal residual stress is from tensile stress to compressive stress.