关键词: 金属板材, 拉深筋, 力学性能, 预应变, 延伸率

Abstract: Taking experiments where sheet metal samples were pulled through drawbead inserts with different geometrical parameters, the effects of the height and the radius of the drawbead, as well as the number of times passing through the drawbead, on the deformation characteristics of the sheet metal samples, were analyzed. Besides, the influences of the pre-strain on the subsequent mechanics properties of the sheet metals were also studied. The results show that, after passing through the drawbead, the sheet metal samples were uniformly stretched in the flow direction, and the pre-strain caused by the drawbead increases with the height of the drawbead, decreases with the radius of the drawbead and increases almost linearly with the times of passing through the drawbead. The larger the pre-strain(is), the higher the subsequent yield strength and tensile strength of the material(is), but the smaller the subsequent elongation(is). With the increase of the pre-strain, the total elongation first decreases and then increases.

Key words: sheet metal, drawbead, mechanics property, pre-strain, elongation