基于镀锌线DP780带钢跑偏控制的冷轧工艺改进研究  

Research on improvement of cold rolling process based on DP780strip deviation control on galvanizing line

作　　者：赵丁藏 陈禄祯 孙文权 高紫明 杨庭松 ZHAO Dingzang;CHEN Luzhen;SUN Wenquan;GAO Ziming;YANG Tingsong(Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417000,China;Institute of Engineering and Technology,University of Science and Technology Beijing,Beijing 102200,China)

机构地区：[1]湖南华菱涟源钢铁有限公司,湖南娄底417000 [2]北京科技大学工程技术研究院,北京102200

出　　处：《轧钢》2025年第1期65-70,92,共7页Steel Rolling

基　　金：国家重点研发计划项目(2023YFB3812602);中央高校基本科研业务费项目(FRF-NP-19-006)。

摘　　要：某产线DP780镀锌基板由十八辊单机架轧机提供,镀锌生产过程中常发生带钢甩尾跑偏、入口活套跑偏以及预热段跑偏导致的降速或停机问题,严重影响了生产稳顺性并造成成本增加。为此,对镀锌线带钢跑偏机理及受力进行分析,采用高次多项式拟合镀锌基板板形,并以高次多项式的一次分量作为带钢跑偏表征指标,通过将DP780基板的全长板形一次分量与镀锌线各CPC全长纠偏量数据对比,发现焊缝处带钢板形一次分量骤变是造成焊缝处带钢跑偏的主要原因。通过在冷轧末道次采用非对称目标板形以及毛辊轧制措施,并以板形一次分量曲线为依据制定单机架带钢头尾切除量后,生产DP780带钢时的切损率由冷轧工艺优化前的7.23%下降为2.66%,有效提升了DP780带钢的镀锌生产稳顺性。DP780galvanized substrate strip is provided by an 18-high single stand mill in a production line,during the galvanizing process of DP780steel,the problems such as strip tail swinged deviation,strip deviation in entry looper and preheating section often occur,leading to speed reduction or machine stoppage.These problems significantly impact production stability and result in substantial cost losses.Therefore,the deviation mechanism and stress state of strip on galvanized line are analyzed.A higherorder polynomial is employed to fit the strip flatness of the galvanized substrate strip,and the first-order coefficients after fitting is used as an indicator to characterize the deviation.The comparison between the first-order coefficient of the full-length flatness of DP780galvanized substrate strip and the processing data of each continuous process controller(CPC)on the galvanizing line reveals that significant change of flatness first-order coefficients at the welding seam is the main factor causing strip running deviation.By using an asymmetric flatness target curve and textured roll at the final rolling pass,and establishing the criterion of cut length at the strip head and tail based on the strip flatness first-order coefficient,the cut loss rate of DP780strip is reduced from 7.23%to 2.66%after cold rolling process optimization,which effectively improves the stability of DP780 galvanized production.

关 键 词：DP780双相钢 镀锌 带钢跑偏 基板板形 板形目标曲线 工艺优化 

分 类 号：TG3[金属学及工艺—金属压力加工]