基于曲率积分的Q235/S304复合板矫直压下量分析

Analysis of straightening reduction of Q235/S304 composite plate by curvature integration method

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。

According to the elastic-plastic bending theory,the straightening reduction could be calculated by the curvature integral method.The 3 Ddynamic finite element model of bimetal composite plate was established during straightening process.And then the change rules of longitudinal displacement of composite plate and the influence on the residual stress of composite plate under different reduction procedures during straightening process were analyzed by simulation.The results show that the part of the initial wave shape can be eliminated in initial pass time,and the crown of straightened plates can be largely reduced after properly increasing the subsequent inflection during the straightening process,residual stress of the plate is small and uniformly distributed.The flatness of straightened composite plate is complied with the national standards.