热连轧带钢厚度缺陷溯源研究及应用  

Research and application of thickness defect traceability of hot-rolled strip

作　　者：李维刚 石林[2] 刘玮汲 LI Weigang;SHI Lin;LIU Weiji(Engineering Research Center for Metallurgical Automation and Measurement Technology of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学冶金自动化与检测技术教育部工程研究中心,湖北武汉430081 [2]武汉科技大学信息科学与工程学院,湖北武汉430081

出　　处：《中国冶金》2024年第1期99-108,共10页China Metallurgy

基　　金：国家自然科学基金资助项目(51774219)。

摘　　要：在带钢热连轧生产过程中,终轧厚度精度是体现带钢产品质量的关键指标之一。带钢厚度控制过程涉及多个模型,具有多变量、强耦合、非线性等复杂性,是热连轧带钢L2过程控制精度的最终体现。实际生产中,厚度缺陷时有发生,形成缺陷的原因复杂多样,目前主要依赖事后的人工分析,其难度大、效率低。为此,研发了热连轧带钢厚度缺陷的自动溯源模型,针对轧制完成后出现头部厚度缺陷的带钢产品,识别和分析厚度缺陷的形成机理,追溯和确定导致厚度缺陷的主要原因。融合资深数模专家的分析经验,通过深入挖掘带钢厚度控制背后的模型机理、理顺带钢厚度与各轧制参数之间的耦合关系,建立了热轧带钢厚度缺陷溯源的分析流程,构建了以辊缝模型设定不准、轧制力模型不准、轧制模型参数设定异常为核心的分析模块。最后,将国内某1780 mm热连轧机组连续3个月生产的带钢数据用于模型性能测试,结果表明,带钢厚度缺陷溯源的准确率达到90.27%,基本满足实际生产需求,实现了热连轧带钢厚度缺陷的自动溯源,大大提高了厚度缺陷溯源的分析效率。During the process of strip hot rolling production,finish rolling thickness accuracy is a critical indicator reflecting the product quality.Strip thickness control involves complex models with multivariable,strong coupling,and nonlinearity,it epitomizes precision in Level 2 control for hot strip rolling.Practical production often experiences thickness defects due to diverse,intricate causes.Current analysis heavily relies on manual post-analysis,which is challenging and inefficient due to the complexity involved.In response,an automatic traceability model for thickness defects in hot-rolled strip was developed,which focused on strip products with head thickness defects,identified and analyzed their mechanisms,and traced the primary causes behind these issues.The expertise of experienced numerical modeling experts was integrated.By delving into the model mechanism underpinning strip thickness control and clarifies the coupling relationship between strip thickness and rolling parameters,the study presented an analysis workflow for tracing thickness defects of hot-rolled strip,featuring core analysis modules addressing issues such as inaccuracies in roll gap and rolling force models,as well as anomalies in rolling model parameters.Finally,the strip data of 1780 mm hot strip mill in a steel plant for three consecutive months were used for model performance test.The results demonstrate a 90.27%accuracy in tracing thickness defects of the strip,effectively meeting actual production requirements.This achievement signifies the successful automation of thickness defect tracing in strip hot rolling,leading to a significant improvement in analysis efficiency.

关 键 词：热连轧带钢 头部厚度 厚度控制 自动溯源 轧制机理 

分 类 号：TG335.56[金属学及工艺—金属压力加工]