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根据弹塑性弯曲理论,利用曲率积分理论进行压下量的计算。建立双金属复合板在矫直过程中的三维动态有限元模型,通过仿真分析复合板在矫直过程中不同压下规程下纵向位移的变化规律以及对残余应力的影响。研究表明,矫直过程中,初始道次消除部分初始浪形,适当增大后续道次的反弯会很大程度上减小矫直后板材的凸度,板材残余应力较小且分布较均匀,矫直后复合板材的平直度符合国家标准。
Based on the elasto-plastic bending theory, the calculation of the reduction is made by using the curvature integral theory. The three-dimensional dynamic finite element model of bimetal composite plate during straightening process was established. The variation regularity of longitudinal displacement of composite plate during straightening process and its effect on residual stress were analyzed by simulation. The research shows that the initial pass can eliminate some of the initial waves in the straightening process and properly increase the backward bending of the follow-up pass will greatly reduce the crown of the straightened plate after the straightening. The residual stress of the plate is smaller and the distribution is more uniform After straightening, the flatness of the composite plate meets the national standard.