汽车用铝合金板拉深性能评估参数

Evaluation parameter of drawability of automotive aluminum alloy sheets

为了准确地评估汽车用铝合金板的拉深性能,在单向拉伸试验、平面应变拉伸试验和圆筒件拉深试验获得的样本基础上,采用回归分析方法,全面地分析了汽车用铝合金板各种材料性能参数与其拉深性能之间的对应关系。研究表明:在所给出的材料性能参数中,xb值(平面应变抗拉强度与单向抗拉强度之比)对极限凸模行程的相关性最为显著,其次是硬化指数n及宽度颈缩率ψ等参数,而厚向异性系数r与铝合金的拉深性能并不相关。上述结果表明,在评估汽车用铝合金板的拉深性能时,使用xb值为评价指标最为准确。

In order to exactly evaluate drawability of automotive aluminum alloy sheets, the correlation between material properties and formability of automotive aluminium alloy sheets, based on the sample data obtained from uniaxial tension, plane strain tension and cylindrical deep drawing tests, is analyzed by means of regression analysis method. Investigation shows that correlation of the value x_b, namely the ratio of the tensile strength in plane strain tension and uniaxial tension tests, is the most remarkable among all the given material parameters, and that of the hardening exponent n and the width necking percentage ψ is less than that of the x_b, but the anisotropical coefficient r doesn't have correlation. The results above indicate that it is much more exact to evaluate drawability of automotive aluminium alloy sheets by means of the values of x_b.