冷轧连退平整机板形反馈控制策略优化  

Optimization of flatness feedback control strategy for temper mill of cold rolling continuous annealing

作　　者：张大志[1] 张贺[1] 宋诗文 ZHANG Dazhi;ZHANG He;SONG Shiwen(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学机械工程学院,北京100083

出　　处：《冶金自动化》2025年第2期75-86,共12页Metallurgical Industry Automation

基　　金：国家自然科学基金项目(51575040)。

摘　　要：当前很多从国外引进的平整机板形闭环反馈控制系统采用的是顺序控制策略,对四分浪和复合浪调控效果不佳,且不能很好地处理各调控手段之间对板形质量的联合调控关系。针对以上板形顺序控制策略不足的问题,以某钢厂六辊CVC平整机为研究对象,对当前机组顺序控制策略进行优化,提出一种基于均方根传播梯度下降算法(root mean square propagation,RMSprop)梯度下降算法的板形闭环反馈控制策略。该控制策略考虑了工作辊弯辊、中间辊弯辊和CVC窜辊三种调控手段,旨在最快地找到使得板形偏差最小的三种调控手段的调控量组合,充分发挥各调控机构的调控能力。与机组原顺序控制策略进行仿真对比分析,对比试验表明,基于RMSprop梯度下降算法的板形控制策略大幅提高了轧机的高次、复杂板形控制能力,相对顺序控制策略板形质量大幅提升;最后将基于RMSprop梯度下降算法的板形控制策略通过CFC编程,综合考虑现场程序负载率问题,将该程序并行融合进一级控制系统中,实现对板形的自动化控制;结果表明,基于RMSprop梯度下降算法的板形控制策略具有良好的应用效果。Currently,many imported temper mill flatness closed-loop feedback control systems employ a sequential control strategy,which proves to be ineffective in controlling compound waves and fourth-order flatness deviations.Moreover,these systems struggle to handle the collaborative regulation among different flatness control mechanisms.Focusing on a six-high CVC temper mill at a steel plant,the existing sequential control strategy was optimized and a flatness closed-loop feedback control strategy based on the RMSprop gradient descent algorithm was proposed.The proposed strategy considers three regulation methods:work roll bending,intermediate roll bending,and CVC shifting,aiming to quickly determine the combination of regulation quantities that minimizes flatness deviations.This ensures the full utilization of each control mechanism's potential.Simulation and comparative experiments demonstrate that the flatness control strategy based on the RMSprop algorithm significantly enhances the control of high-order and complex flatness defects,markedly improving flatness quality compared to the original sequential control strategy.Furthermore,the RMSprop-based flatness control strategy was implemented via CFC programming,addressing program load rate issues on-site by integrating the strategy into the primary control system in parallel.Results confirm that the RMSprop-based strategy achieves excellent application outcomes.

关 键 词：平整机 板形控制 闭环反馈优化控制策略 梯度下降算法 

分 类 号：TG333[金属学及工艺—金属压力加工]