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为提高精密矫直加工精度及效率,探讨多次矫直过程中应力叠加特性,研究多次矫直行程预测迭代建模方法.首先,基于经典弹塑性变形理论,建立单次矫直行程预测理论模型;运用应力叠加原理,研究二次矫直的截面应力分布状态,推导出二次矫直时截面应力的再分布方程及矫直参数解析表达式;在此基础上,研究多次矫直过程中的矫直次数-应力演变规律,建立考虑应力叠加的多次矫直行程预测迭代模型.采用自主研发的精密矫直机进行在线矫直实验,进行行程预测模型实验对比.实验结果表明:实际矫直过程中,多次矫直行程预测迭代模型的预测精度和矫直效率优于未考虑应力叠加作用的单次矫直行程预测理论模型,该方法可推广应用于直线金属条材的精密矫直中.
In order to improve the accuracy and efficiency of precision straightening process, the stress superposition characteristics of multiple straightening process are discussed, and the iterative modeling method of multiple straightening process prediction is studied.Firstly, based on classical elasto-plastic deformation theory, a single straightening stroke prediction theory Model; the stress superposition principle is used to study the cross-sectional stress distribution of secondary straightening, and the analytical formula of cross-section stress redistribution and the straightening parameter are deduced. Based on this, the multi-straightening process In order to establish the iterative model of multi-straightening trip prediction considering the stress superposition.The in-line straightening experiment was carried out by the precision straightening machine researched independently and the stroke prediction model was contrasted experimentally.The experimental results showed that the actual In straightening process, the prediction accuracy and straightening efficiency of iterative model of multiple straightening trip prediction is better than that of single straightening trip prediction model without considering stress superimposition. This method can be widely applied to precision straightening of straight metal strip Straight.