非回转对称拉深变形规律的研究 ——薄板矩形盒形件拉深的形状特性

为了研究非回转对称成形中材料的变形规律及其成形性 ,根据薄板的矩形盒件 (3 6mm× 72mm)拉深实验 ,针对法兰特定部位进行了应力、应变解析。在此基础上 ,着重分析了法兰变形及直边部的变形缓和作用随形状特性的变化 ,指出rc/l2 为 0 1左右时 ,与正方形盒件相同可以获得较大的极限拉深高度。另外 ,根据rc/l2 适当地切除板坯的角部材料或调整板坯长短边变形尺寸 ,可以有效地减轻法兰曲边或短边的变形抵抗 ,从而相应地提高拉深极限。

Study on the Law of Deformation in a Non-rotational Symm etry Drawing——The Shape Property in a Rectangular Case Drawing of S heet Metal

Based on the experiments of rectangular case drawing of sheet metal and analysis of stress and strain state of symmetry parts for flange,the paper analyzes,with emphasis,the change that the deformation in the flange and function of the deformation ralaxation of straight side flange goes along with shape parameter r c/l 2 . The points of blank is cut or adjusted the deformation size of long and short side of blank propety according to r c/l 2 ,the deformation resistance of flange corner or short side region will be reduced,and drawing limit can be raised.