|
|
Analysis and control of hot-rolled strip crown for cold-rolled middle-wave control |
ZHANG Qiang1, LI Hong-bo1, CHEN Gang2, ZHANG Jie1, ZHANG Peng-wu2, WANG Wu-zhou2 |
1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Baosteel Wuhan Iron and Steel Co., Ltd., Wuhan 430083, Hubei, China |
|
|
Abstract 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 C40 values of the hot-rolled strip which was led to the cold-rolled strip middle-wave flatness defect, ere over 50 μm. And the ratio of the over 50 μm C40 value was 44.07%. It is proposed that the larger C40 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 10 μm. 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 50 μm to 30 μm, 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 coordination control for the strip profile in the hot and cold strip rolling process.
|
Received: 08 June 2022
|
|
|
|
[1] 何安瑞.热轧宽带钢板形控制技术的现状及未来发展[J].轧钢,2022,39(3):1.(HE An-rui. Present situation and future development of profile and flatness control technologies of hot rolled wide strip[J]. Steel Rolling,2022,39(3):1.) [2] 柴箫君,李洪波,张杰,等.热轧轧制压力横向分布规律及预测模型[J].钢铁,2017,52(6):52.(CHAI Xiao-jun,LI Hong-bo,ZHANG Jie,et al. Transverse distribution law of rolling force and its prediction model in hot rolling[J]. Iron and Steel,2017,52(6):52) [3] 左远鸿.热轧带钢断面轮廓的控制与优化[J].中国冶金,2013,23(7):37.(ZUO Yuan-hong. Hot strip profile control and optimization[J]. China Metallurgy,2013,23(7):37.) [4] Myllykoski P,Nylander J. The effects of hot strip crown on the shape of cold rolled strip[J]. Scandinavian Journal of Metallurgy-Processes and Materials Engineering,1996,25(3):122. [5] 李俊洪,戚向东,连家创,等.热轧带钢局部高点对冷轧带钢板形的影响[J].钢铁,2004,39(6):47.(LI Jun-hong,QI Xiang-dong,LIAN Jia-chuang,et al. Effect of local high point of hot rolled strip on the shape of cold rolled strip steel[J]. Iron and Steel,2004,39(6):47.) [6] 牛世浦,张乃林,卢少保,等.热轧带钢亮带/冷轧带钢凸棱的成因及解决措施[J].钢铁,2008,43(12):96.(NIU Shi-pu,ZHANG Nai-lin,LU Shao-bao,et al. Causes and solutions of convex edges in hot rolled strip bright strip/cold rolled strip [J]. Iron and Steel,2008,43(12):96.) [7] Belskiy S M, Mukhin Y A,Mazur S I,et al. Influence of the cross section of hot-rolled steel on the flatness of cold-rolled strip[J]. Steel in Translation,2013,43(5):313. [8] 罗石念,张保忠.低碳热轧带钢局部高点对冷轧卷起筋的影响[C]//2014年全国轧钢生产技术会议文集(上).无锡:中国金属学会,2014:232.(LUO Shi-nian,ZHANG Bao-zhong. Influence of low-carbon hot strip local high points on ribbing of cold rolled coil[C]//Proceedings of the 2014 National Conference on Steel Rolling Production Technology (Previous). Wuxi:The Chinese Society for Metals,2014:232.) [9] 李广林,陈伟,刘玉金,等.热轧原料断面轮廓对冷轧硅钢尺寸精度的影响分析[J].钢铁研究学报,2014,26(1):33.(LI Guang-lin,CHEN Wei,LIU Yu-jin,et al. Analysis of the influence of hot-rolled raw material section profile on the dimensional accuracy of cold-rolled silicon steel[J]. Journal of Iron and Steel Research,2014,26(1):33.) [10] MA X,WANG D,LIU H,et al. Influence of profile indicators of hot-rolled strip on transverse thickness difference of cold-rolled silicon steel[J]. Metallurgical Research and Technology,2019,116(1):105. [11] 王少飞,孙光中,窦爱民,等.热轧原料对冷连轧机板形控制的影响[J].轧钢,2019,36(2):35.(WANG Shao-fei,SUN Guang-zhong,DOU Ai-min,et al. Influence of hot rolling raw materials on plate shape control in cold rolling mills[J]. Steel Rolling,2019,36(2):35.) [12] Belskiy S M,Pimenov V A,Shkarin A. Analysis of geometrical parameters of hot-rolled rolling[J]. IOP Conference Series Materials Science and Engineering,2020,971:022074. [13] 郑旭涛.2 250 mm热连轧机带钢板廓控制研究[D].北京:北京科技大学,2015.(ZHENG Xu-tao. Study on the Control of Strip Sheet Profile in 2 250 mm Hot Strip Mill[D]. Beijing:University of Science and Technology Beijing,2015.) [14] 周志刚,梁井义,牛肇强.IMS多通道凸度仪在1 450热轧中的应用和功能开发[C]//全国冶金自动化信息网2010年年会论文集.青岛:全国冶金自动化信息网,2010:370.(ZHOU Zhi-gang,LIANG Jing-yi,NIU Zhao-qiang. Application and function development of IMS multi-channel profile gauge in 1 450 hot rolling[C]//Proceedings of the 2010 Annual Conference of the National Metallurgical Automation Information Network. Qingdao:Metallurgical Industry Automation,2010:370.) |
[1] |
ZHANG Qi, MI Zhenli, ZHU Rong, WANG Mai, WU Yanxin, LI Lei. EBSD sample preparation and characterization method of oxide scale on the surface of hot-rolled steel strip[J]. PHYSICS EXAMINATION AND TESTING, 2023, 41(1): 21-24. |
[2] |
JIN Fengwei,FENG Ying,CHEN Zhaoyu,SUN Wenquan,ZHANG Yongjun. Pre-alculation optimization of finishing delivery temperature of hot strip head based on data driven[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2022, 34(7): 655-663. |
[3] |
YANG Ting-song, BAI Yu-hang, LEI Zhen-yao, XU Zhi-qiang, DU Feng-shan. Influence of magnetic gathering structures on roll profile electromagnetic control ability[J]. Iron and Steel, 2022, 57(5): 81-89. |
[4] |
WANG En-rui, CHEN Zi-gang, LIU Feng-lin, LIU Tian-wu, ZHANG Ming. Oxide scale structure of hot rolled structural steel and its effect on pickling quality[J]. Iron and Steel, 2022, 57(3): 71-78. |
[5] |
LI Wei-gang, XU Kang, LI Jin-ling, ZHAO Yun-tao. Research and application of surface defect recognition algorithm for hot rolled strip[J]. Iron and Steel, 2022, 57(10): 139-147. |
[6] |
YU Jia-xue, SUN Jie, ZHANG Dian-hua. Accurate prediction of head thickness of hot-rolled strip based on deep learning[J]. Iron and Steel, 2021, 56(9): 19-25. |
|
|
|
|