铝合金热轧过程塑性变形分析

DEFORMATION ANALYSIS OF THE HOT ROLLING PROCESS OF ALUMINUM ALLOY

根据弹塑性热力耦合大变形有限元理论,获得热轧过程中的数值仿真模型,分析轧制过程中轧件单道次轧制的变形规律以及平均应变率、摩擦因数等参数对轧制变形的影响。计算结果表明,轧件的应变在轧制过程中逐渐增大,并且在轧件表面的应变要大于其中心应变;轧件表面在轧制入口处应变率最大,轧件中心最大应变率发生在接触区约1/3处;轧件表面应变受摩擦因数的影响较大,轧件中心处应变及整体应变率受摩擦因数影响较小。

According to elastic-plastic and thermal-mechanical coupled finite element method theory, the hot rolling model have been developed to predict the deformation history of aluminum sheet undergoing single-pass hot rolling and the influences of strain rate and friction on the deformation across the thickness of slabs. The results show that the strain of aluminum sheet increases with time and the strain at the surface is larger than that in the center; the largest strain rate at the surface is in the roll gap, but that in the center is at about on third of the contact arc length ; an increase in the friction coefficient leads to a rise of the strain level near surface but have less effect on the strain in the center and strain rate through thickness.