热轧高强带钢纵切后侧弯缺陷及其内应力重分布  

Lateral Bending and Stress Redistribution of High Strength Steel Strip after Longitudinal Slitting

作　　者：周兵营 邵健 何安瑞[1,2] 司小明 崔宇轩[1] 闻成才[3] ZHOU Bingying;SHAO Jian;HE Anrui;SI Xiaoming;CUI Yuxuan;WEN Chengcai(Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083;National Engineering Research Center for Advanced Rolling Technology,University of Science and Technology Beijing,Beijing 100083;Fourth Steel Rolling Plant of Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000)

机构地区：[1]北京科技大学工程技术研究院,北京100083 [2]北京科技大学高效轧制国家工程研究中心,北京100083 [3]马鞍山钢铁股份有限公司第四钢轧总厂,马鞍山243000

出　　处：《机械工程学报》2020年第18期43-50,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51674028);创新方法工作专项(2016IM010300)资助项目。

摘　　要：控轧控冷技术已经普遍应用于高强钢的生产过程当中。由于细晶强化的需求,高强钢冷却速率快,横向温度的不均和冷却不同步明显,使得轧制和冷却过程中沿带钢横向分布的内应力差异控制难度大,在后续的纵切分条过程中易导致侧弯缺陷,这是高强钢生产中存在的共性难题。利用有限元软件ABAQUS结合FORTRAN子程序,建立热轧高强带钢纵切过程的有限元模型,并通过解析模型进行反向验证,研究带钢纵切后侧弯缺陷及其内应力重分布。结果表明,纵切后各分条侧弯与带钢内应力重分布紧密相关,纵切打破带钢初始内应力的平衡状态,各分条内应力重新分布并达到二次平衡状态,同时产生侧弯缺陷。结合研究结论,对某热轧厂高强钢平整过程进行工艺优化,解决了汽车大梁钢M510L纵切后第一、第四分条向外侧弯问题,验证了研究过程和结果的正确性。针对带钢纵切过程中内应力重分布的研究,可为今后纵切缺陷的预防提供理论指导。TMCP has been widely used in the production of high strength steel.Due to the demand for fine grain strengthening,high strength steel strip’s fast cooling rate,uneven lateral temperature and unsynchronized cooling,make the control of the internal stress along the transverse during rolling and cooling difficult,and it is easy to cause lateral bending defect after longitudinal slitting,which is a common problem in the production of high strength steel strip.A finite element model is established by ABAQUS combined with FORTRAN subroutine,which is verified by analytical model.The results show that the relationship between the lateral bending and the stress redistribution after longitudinal slitting is closely related.The lo ngitudinal slitting breaks the equilibrium of the initial stress of the strip,and the stress redistributes and reaches the second equilibrium.Combined with the research conclusions,the process optimization of high strength steel levelling in rolling mill is applied,and the outer lateral bending defect of the first and fourth strips of the M510L is well solved,further verifying the validity of the rese arch process and results.The research on the stress redistribution during longitudinal slitting provides theoretical guidance for the prevention of slitting defects.

关 键 词：高强带钢 纵切 侧弯 应力重分布 有限元 

分 类 号：TG335[金属学及工艺—金属压力加工]