蛋盒型结构成形过程数值模拟研究

Research on the egg-box structure forming process with numerical simulation

蛋盒型结构是一种轻质、高强、具有吸能特性的新型结构,其成形过程和最终成形形貌对性能有很大影响。首先描述了蛋盒型结构的成形过程及受力情况;随后运用Abaqus/Explicit软件对典型蛋盒型结构的成形过程进行了模拟,得到了成形极限高度时的形貌、减薄率、成形力等;最后分别分析了凸模结构参数、摩擦系数对蛋壳型结构成形结果的影响规律。研究表明:凸模半径的增加会增大成形力及成形极限高度,摩擦系数的作用会使最大减薄位置由凸模顶点位置向外移动;当选用凸模半径为周期间距的1/5时,摩擦系数在0.1~0.15之间时成形效率较高。

The egg-box structure is a novel structure with lightweight, high strength and exeellent energy absorption characteristics, and its forming process and final shape have great influence on its performance. At first, the forming process and force condition of the egg-box strueture were described briefly, and the forming proeess of the typical egg-box structure was simulated by the Abaqus/Explicit software. Then, the final shape, reduction rate and forming foree at tile ]imil forming height were obtained. Finally, the influences of punch structural parameters and friction coefficient on the forming process of the egg-box structure were studied respectively. The results show that the limit forming height and forming foree are both increased with the increasing of punch radius, and the maximum thinning position moves outward from the punch vertex by changing the friction coefficient. Thus, when the selected punch radius is 1/5 times of the period spac- ing and the friction coefficient is between 0. 1 and 0. 15, the forming efficiency is best.