塑性强化材料矫直反弯特性研究

发布时间：2018-05-02 01:55

本文选题：塑性强化 + 辊式矫直　；参考：《机械工程学报》2015年08期

【摘要】：为了深入研究塑性强化材料在平行辊式矫直过程中一次反弯与二次反弯特性的关系,根据工程弹塑性力学的基本原理,建立基于强化弹塑性材料辊式矫直弯曲力学模型。通过解析法描述两次反弯过程中的应力关系,给出辊式矫直过程中截面弯曲过程材料残余应力分布、弯矩比、加载应力变化过程。证明两次反弯过程中经历一次反弯后,二次反弯截面弯矩比与曲率比不再是原有简单M-C关系,而是与一次弯曲曲率比、二次弯曲曲率比与强化系数相关的函数。理论上证明原有弯曲理论不再完全适用于多次连续反弯矫直过程。解析结果表明,辊式矫直过程中经历二次反弯的材料截面弹性极限弯矩值下降,矫直弯曲减小,回弹比增大。同种材料考虑强化与不考虑强化矫直后残余应力均方差分别为71.2与65.6,回弹比均值分别为0.49和0.43。
[Abstract]:In order to study the relationship between the first reverse bending and the secondary reverse bending in the parallel roller straightening process, a roll straightening mechanical model based on the basic principles of engineering elastoplastic mechanics was established. The stress relationship in the process of twice reverse bending is described by analytical method, and the distribution of residual stress, the ratio of bending moment to moment, and the variation of loading stress in the process of roll straightening are given. It is proved that the moment ratio and curvature ratio of the secondary reverse bending section are no longer the simple M-C relation, but a function related to the ratio of the first bending curvature, the ratio of the secondary bending curvature to the strengthening coefficient after the first reverse bending. It is proved theoretically that the original bending theory is no longer fully applicable to multiple continuous reverse bending straightening processes. The analytical results show that the elastic ultimate bending moment of the cross section of the material undergoing secondary reverse bending decreases, the straightening bending decreases and the springback ratio increases during the roll straightening process. The mean square deviation of residual stress in the same material is 71.2 and 65.6, respectively, and the mean springback ratio is 0.49 and 0.43, respectively.
【作者单位】：北京科技大学高效轧制国家工程研究中心;河北钢铁集团邯宝热轧厂;
【基金】：国家科技支撑计划(2012BAF09B04) 北京青年英才计划(YETP0413) 广西科技开发计划课题(2013AA01001)资助项目
【分类号】：TG333.23

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