针对冷轧中间浪的热轧带钢凸度分析与控制  

Analysis and control of hot-rolled strip crown for cold-rolled middle-wave control

作　　者：张强[1] 李洪波[1] 陈刚 张杰[1] 张鹏武 王武洲 ZHANG Qiang;LI Hong-bo;CHEN Gang;ZHANG Jie;ZHANG Peng-wu;WANG Wu-zhou(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Baosteel Wuhan Iron and Steel Co.,Ltd.,Wuhan 430083,Hubei,China)

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]宝钢股份武汉钢铁有限公司,湖北武汉430083

出　　处：《钢铁》2023年第2期90-95,共6页Iron and Steel

基　　金：国家“十二五”科技支撑计划资助项目(2015BAF30B01)。

摘　　要：针对某钢厂冷轧工序电镀锌等钢种表现出的中间浪板形缺陷,通过长期的跟踪对比分析,认为电镀锌钢种冷轧中间浪缺陷与热连轧生产线的热轧带钢板廓凸度有关。为明确热轧带钢凸度与冷轧中间浪之间的对应关系,统计分析了热轧带钢凸度情况,表现出冷轧中间浪问题的热轧带钢凸度值C_(40)均为50μm以上,而且现场实际生产的热轧带钢C_(40)大于50μm的比例达到了44.07%,因此提出热轧带钢C40过大是产生冷轧中间浪的一个主要原因;分析了热轧凸度仪数据处理计算过程对实测凸度值的影响规律,并将凸度仪的在线测量值与人工离线测量值进行对比,发现离线测量凸度均大于在线测量凸度,偏差平均值为10μm左右,因此提出热轧现场凸度仪因数据处理过程中存在的误差,导致实际生产的带钢凸度较测量值偏大是产生冷轧中间浪的另一个主要原因。针对热轧产品凸度过大,综合生产稳定性、改进过渡性原则,提出了将原凸度目标50μm设定为30μm的“小凸度”控制策略,并投入工业生产实践,热轧带钢凸度得到有效控制。分别连续统计实施“小凸度”轧制策略前后各5个月的实际生产数据,发现电镀锌钢种因存在中间浪问题而造成的成品降级率由月均4.46%降低到0.68%,并取得良好工业应用效果。研究成果为热轧-冷轧板形问题的协调控制提供了思路和实践经验。The middle-wave flatness defect happens during the production of electro-galvanizing steel in a cold rolling mill.It is found that the cold-rolled strip with middle-wave flatness defect is related to the hot-rolled strip crown after the industrial data tracking and analyzing.In order to obtain the relationship between the hot-rolled strip crown control status and the cold-rolled strip middle-wave flatness defect,he industrial hot-rolled strip crown was statistical analyzed.It was found that the C40values of the hot-rolled strip which was led to the cold-rolled strip middle-wave flatness defect,ere over 50μm.And the ratio of the over 50μm C_(40)value was 44.07%.It is proposed that the larger C_(40)value of the hot-rolled strip was a major cause for cold-rolled middle-wave defects.The influence rule of the data processing and calculation process of the hot-rolled strip profile gauge on the measured crown value is analyzed afterwards.The online crown measured value and the off-line crown measured value by manual measurement are compared.All the off-line crown measured values are larger than the online crown measured value,the difference is about 10μm.So it is proposed that the error in the data processing process of the hot-rolled strip profile gauge,which lead to the actual larger strip crown than the measured value,is another major cause for cold-rolled middle-wave.To solve the larger strip crown problem,and considered the production stability,the transient process,a"small crown"control strategy is propose and put into industrial practice.It changes the hot-rolled strip target crown from 50μm to 30μm,the crown of hot-rolled strip is effectively controlled.The real production data is counted respectively before and after the"small crown"control strategy put into industrial practice.The re-grading rate of cold-rolled strip due to the defects of middle wave is reduced from 4.46%to 0.68%per month,the industrial practice got a good result.The research result shows a research idea and practical experience for the c

关 键 词：冷轧中间浪 热轧带钢 凸度 凸度仪 小凸度控制策略 

分 类 号：TG335.56[金属学及工艺—金属压力加工]