力-位移分控多点成形帆面回弹的数值模拟

回弹是影响成形件质量的主要因素之一,是板材冷冲压成形必须解决的问题.以帆面为例,采用显-隐式算法模拟力-位移分控多点成形在成形帆面时的回弹现象.对不同板厚t、曲率半径r、帆面参数a的帆面进行回弹数值模拟,结果表明,帆面成形后的回弹在两个帆形上相互影响.其中在大曲率半径方向（y=0边）上的回弹起主导作用,并影响着小曲率半径方向（x=O边）上的回弹.在大曲率半径方向上,曲率半径越小,板厚越大,帆面参数越小,回弹越小;在小曲率半径方向上曲率半径越小,板厚越小,帆面参数越小,回弹越小.

Numerical simulation of springback of force-displacement separated control in multi-point forming for sail surface

Springback which should be solved is one of the key defects in plate forming process. Taking the sail workpiece as an example, the springback matter during the processes of force-displacement separated control in muhi-point forming has been simulated and studied based on explicit-implicit algorithm. The springbaek process of sail surface with different plate thickness, curvature radius r, and rail parameter a have been simulated. The results show that springbaek of the bigger radius （y=O） is on the leading role, and will influence springbaek of the smaller side （x=O）. On the direction of the bigger radius, the smaller the radius is, the greater the thickness is, and the less sail surface parameter ＆ springback will be got. On the direction of the smaller radius, the smaller the radius is, the smaller the thickness is, and the less sail surface parameter ＆ springback will be got.