热轧薄带平整机支撑辊辊型优化的研究与应用  

Research and application of backup roll profile optimization for hot rolled thin strip temper rolling mill

作　　者：张建雷 张杰 秦松 陆佳栋 岳重祥 ZHANG Jian-lei;ZHANG Jie;QIN Song;LU Jia-dong;YUE Chong-xiang(Jiangsu Shagang Institute of Research of Iron and Steel,Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China;Zhangjiagang Yangzi River Cold Rolled Sheet Co.,Ltd.,Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China;Zhangjiagang Hongchang Steel Plate Co.,Ltd.,Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]江苏沙钢集团江苏省沙钢钢铁研究院有限公司,江苏张家港215600 [2]江苏沙钢集团张家港扬子江冷轧板有限公司,江苏张家港215600 [3]江苏沙钢集团张家港宏昌钢板有限公司,江苏张家港215600

出　　处：《钢铁》2022年第4期79-87,共9页Iron and Steel

摘　　要：某热轧薄带平整机轧辊长度为1800 mm,带钢宽度为1320 mm,两者相差太大,造成工作辊与支撑辊间有害接触区长度过大,在轧辊自身挠度作用下,辊间应力峰值集中于带钢边部位置。随轧制公里数延长,工作辊边部磨损加剧,不利于后期板形控制,同时会缩短轧辊使用寿命。针对热轧薄带平整机工作辊磨损不均匀问题,设计优化支撑辊辊型,通过支撑辊两端倒角设计,减小工作辊与支撑辊间有害接触区长度。并借助数值模拟技术建立平整机三维弹塑性有限元模型,模拟了不同平整工艺、不同支撑辊辊型条件下工作辊的使用情况。通过模拟结果,对比分析不同辊型的板形控制效率、凸度调节域、承载辊缝横向刚度和工作辊接触应力等指标。模拟数据表明,3种倒角支撑辊辊型改善了工作辊应力分布均匀性,有利于提高轧辊服役周期;辊间有害接触区长度明显减小;弯辊力板形调控效率由0.048μm/kN提高到0.130μm/kN。考虑到带钢有跑偏风险,如果支撑辊倒角插入量过大,支撑辊倒角易窜入到带钢内部,造成边部拉紧甚至断带,因此选择倒角插入量最小的V+25辊型,并应用于现场调试。现场数据表明,平整机板形调控能力明显增强,单位轧制周期内平整量显著增加。工作辊平均使用寿命由1500 t提高至1800 t,产品合格率由95%提升至98%以上。The roll length of a hot rolled thin strip temper rolling mill is 1800 mm and the strip length is 1320 mm.The difference between the two is too large,which results in the too large length of harmful contact area between work roll and backup roll.Under the action of roll bending,the peak stress is concentrated at the strip edge.With the extension of rolling kilometers,the edge wear of work roll intensifies,which is not conducive to the later shape control and shorten the life of roll.In view of work roll uneven wear problem for hot rolled thin strip temper rolling mill,the backup roll profile curve was designed.Through the chamfer design at both sides of the backup roll,the length of harmful contact area between the work roll and the backup roll was reduced.With the help of numerical simulation,a three-dimensional elastic-plastic finite element model of temper rolling mill was established to simulate the roll usage under different temper rolling processes and roll profile parameters.It was compared and analyzed from four evaluation indexes,shape control efficiency,crown adjustment region,lateral stiffness of bearing roll gap and contact stress of work roll.The simulation results show that three roll profile improves the stress distribution uniformity of the work roll,helps to improve the service cycle of the roll.The length of harmful contact area between rollers is significantly reduced.The regulation efficiency of bending roll force is increased from 0.048μm/kN to 0.130μm/kN.Considering the risk of the strip running deviation,if the chamfer insertion of the backup roll is too large,the chamfer of the backup roll is easy to jump into the strip steel,resulting in edge tension or even belt breakage.Therefore,the V+25 roll profile with the smallest chamfer insertion amount was selected and applied to the site commissioning.The field data show that flatness control ability of the temper rolling mill is significantly increased,and the roll tonnage per unit rolling cycle is significantly increased.The average life of

关 键 词：平整机 辊型设计 数值模拟 弯辊力调控功效 有载辊缝调节域 横向刚度 应力分布均匀性 

分 类 号：TG333.4[金属学及工艺—金属压力加工]