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将弯曲分层矫直数值计算和实验验证相结合,研究了双金属复合板材辊式矫直过程中的连续弯曲变形和力能参数。结果表明,使用弯曲分层矫直计算模型是计算双金属复合板材矫直过程的有效方法,分层算法的结果与实验数据有较好的一致性;双金属复合板材弯曲应变的中性层与几何中间层产生偏离,中性层位置随弯曲程度和材料比例而变化;同时,由于材料的力学性能不同,在同一弯曲单元内各组元材料的塑性层比例也不同;计算模型所给出的在双金属复合板材矫直过程中应力应变的演化,与单一材料有明显的不同;在不考虑原始曲率的前提下,矫后残余应力随着弯曲单元的增加而减小。
By combining the numerical calculation of bending stratified straightening and experimental verification, the continuous bending deformation and force energy parameters in roll straightening process of bimetallic composite sheet are studied. The results show that the bending stratified straightening calculation model is an effective method to calculate the straightening process of bimetallic composite sheet. The results of stratification algorithm are in good agreement with the experimental data. The neutral strain of bimetallic composite sheet The geometrical middle layer deviates and the neutral layer position changes with the bending degree and the material proportion; meanwhile, due to the different mechanical properties of the material, the plastic layer proportion of each component material in the same bending unit is also different; The evolution of stress-strain during the straightening process of bimetallic composite sheet is obviously different from the single material. The residual stress decreases with the increase of bending unit without considering the original curvature.