大型U形板材工件渐进滚弯成形数值模拟

摘要

利用ABAQUS有限元分析平台,对大型U形板材工件渐进滚弯成形及其回弹过程进行数值模拟。针对半椭圆形工件形状,提出用半径不同的5段圆弧逼近的几何规划。在此基础上,合理设计滚弯道次,调整ABAQUS参数设置。用模拟优化的工艺参数成形加工半椭圆形板材工件,经origin8拟合配准,其各段曲率半径最大误差小于5%。模拟结果表明,用渐进滚弯方法成形加工半椭圆形工件是可行的。%Numerical simulation of multiple-step incremental roll-bending forming and spring back of large-scale sheet metal with U shape was implemented using ABAQUS. In view of the semi-ellipse shape of workpiece, a geometric plan using five arcs with different radii to approach the original shape piecewise was proposed. On the basis of the programming, reasonable arrangement of the rolling steps was carried out, the parameters in ABAQUS were adjusted. The largest error of curvature radii of different arcs was less than 5 % after simulation of the sheet metal forming according to optimized process fitting with originS.8. The results show that the incremental roll-bending method forming the semi-ellipse shape workpiece is feasible.