摘要
楔形是热轧带钢板形的关键评价指标,高质量的热轧带钢对楔形指标提出较高的要求。精轧带钢楔形控制与跑偏及单侧浪形等板形问题相耦合,楔形调节难度高。一方面,带钢楔形会引起跑偏造成轧制过程的生产问题;另一方面,板带楔形本身即为精轧出口质量的重要指标之一,若楔形控制不达标,极易引起小厚度的带钢在轧制过程起浪,造成严重的板形问题。同时,对于楔形控制,实际生产中依赖操作工的人工调控,存在严重的主观性及科学性和准确性差、效率低等问题。通过有限元建模并依据轧机两侧辊缝倾斜压下量和出口楔形的关系式,建立F7出口楔形闭环反馈控制模型。基于带钢不同的入口厚度、带钢宽度、整体压下量分析热连轧精轧两侧辊缝倾斜压下量对出口楔形的影响规律,提出基于遗传系数的多机架调控策略和基于楔形调控极限的辊缝倾斜压下量分配策略,形成精轧机组楔形控制的各机架辊缝倾斜压下值计算模型。研究结果已用于工业生产,可保证楔形调节过程中的轧制稳定性,并能避免单机架倾斜压下量过大造成附加板形问题。
Strip wedge is key evaluation indicator for hot-rolled strip shape,and high quality hot-rolled strip steel places high demands on wedge indicators.The wedge control in finishing strip is coupled with plate shape problems such as strip deviation and flatness,and the wedge adjustment is difficult.On one hand,strip wedge will cause misalignment and production problems in the rolling process.On the other hand,strip wedge is one of the important indicators of finishing rolling export quality,if the wedge control is not up to standard,it is easy to cause strip with small thickness to wave in the rolling process,resulting in serious plate shape problems.Moreover,for the control of wedges in steel mills,relying on operator labor control,there are serious subjectivity,non-scientificity,inaccuracy,inefficiency and other control problems.The F7 exit wedge closed-loop feedback control model was established through finite element modelling as well as relationship between roll levelling and exit wedge on both sides of the mill.Based on different strip entrance thicknesses,strip widths and reduction,the influence for roll levelling on the exit wedge of both sides for the hot strip finishing mill was analyzed.A multi-stand regulation strategy based on genetic coefficients and roll levelling value distribution strategy based on wedge regulation limits were proposed.A model for calculating the tilted depression value of each stand for wedge control in finishing mills was obtained.The results have been used in industrial production,which ensures the rolling stability during wedge regulation and avoids additional strip profile problems caused by excessive tilting depression amount of single stand.
作者
刘坤
王晓晨
张天明
何海楠
LIU Kun;WANG Xiaochen;ZHANG Tianming;HE Hainan(Technology Center,Tianjin Iron Works Company,Handan 056400,Hebei,China;National Engineering Research Center of Flat Rolling Equipment,University of Science and Technology Beijing,Beijing 100083,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2023年第9期104-111,共8页
China Metallurgy
关键词
热连轧
板形
有限元
楔形控制
辊缝倾斜
遗传系数
hot continuous rolling
plate shape
FEM
wedge control
roll gap tilting
genetic coefficient
