预拉伸板轧制-拉伸残余应力的计算机仿真

为消除铝板冷轧过程中产生的残余应力,采用弹塑性大变形有限元法对变形区内残余应力的分布进行数值模拟.通过分析不同轧制工况对残余应力分布的影响,得到不同压缩量对轧制残余应力的影响; 并对不同轧制工况后的板材进行参数拉伸,得到拉伸力大小、拉伸变形量大小对残余应力消除效果的影响值.模拟结果表明适当的拉伸(2%左右)可以均匀细化、部分消除残余应力,减小残余应力对后续加工的影响. 

Computer simulation of residual stress for cold rolling prestrectching board

To eliminate the residual stress formed during the process of Al board cold rolling, the distribution of stress in the deformation region was stimulated by elas plastics large deformation finite element analysis. Analyzing the effects towards residual stress from different rolling loadcase, the value of cold rolling residual stress caused by different compress was gotten; Analyzing parameters stretching toward different rolling loadcase board, the effect of the residual stress elimination influenced by stretching force and stretching deformation was figured out. The simulative results show that the method of the proper stretching (about 2%) can evenly and partly eliminate the residual stress, reduce the effect toward the following manufacture induced by the residual stress.