关键词: 二维截面法, 回弹计算及补偿系统, 节点偏置算法, 梁类件, 型面整体变形算法

Abstract: Springback problem is always a hotspot in automotive industry and academia, especially when the application of high strength steel in automotive panel is more and more popular. Based on the modeling characteristics of rail panel, a complete system able to calculate and compensate springback and modify the profile is presented. The system includes three main aspects. Firstly, springback of sections can be calculated by 2D section method and finite element method (FEM) codes and the accurate springback results can be obtained in the system. Secondly, the section nodes can be compensated by node-offset algorithm and the nodes information of each section before springback and after compensation can be obtained. And thirdly, according to the matching relationship of the section nodes before springback and after compensation, the compensated profile can be obtained by shape global deformation (SGD) algorithm based on the original profile in this system. This method can ensure the topology consistency of surface before and after modifications and the quality and smoothness of compensated curved surface. The practice proves that this system can save time and cost to a great extent in dealing with springback of rail panel and also a great improvement in surface-smoothness and more accurate compensation can be achieved.

Key words: 2D section method, Node-offset algorithm, Rail member panel, Shape global deformation(SGD) algorithm, Springback calculation and compensation system