热轧带钢板凸度纵向分布三重调控研究与应用

doi:10.13228/j.boyuan.issn0449-749x.20230244

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Abstract Due to the temperature difference between the two ends of the strips and the longer rolling time of the thin strips, a significant attenuation of thin strips in rolling direction occurred on the 1 780 mm hot-rolling production line of Chengde Vanadium and Titanium New Material Co., Ltd., affecting the quality of strips. In response to this phenomenon, an analysis was conducted on the site, including the original roller shape of CVC, the lateral displacement setting of work rolls, and the bending force setting of each stand. It was found that the existing process parameters had reached the limit of plate crown control without changing the existing cooling equipment and rolling rhythm. Based on that, the threefold regulation combining original roller shape optimization of CVC, axial shifting control of work roll and dynamic adjustment of bending force is put forward, which provides theoretical guidance and basis for improving the crown attenuation of strips. Based on the three-dimensional metal deformation model and the elastic deformation model of the roll system, a crown control model suitable for the hot-rolled thin strips was constructed in light of the on-site working conditions and process characteristics. Four roller shape optimization schemes were proposed with the goals of F1, F1-F2, F1-F3, and F1-F4, respectively, which then were combined with the lateral displacement of work rolls and the dynamic adjustment of bending force. The effects on longitudinal distribution of crown and the rules of it were analyzed. The results show that with a target crown of (45±15)μm, the crown distribution of strip steel in rolling direction can be 34-45, 37-45, 40-47 and 41.2-49.4 μm respectively using the optimization schemes above. The corresponding attenuations are 11, 8, 7, and 8.2 μm respectively. The bending forces of F1 to F4 are increased by 500, 550, 740, and 680 kN respectively. In addition, the crown attenuation can be reduced from 8 μm to 10 μm after this method is applied to the production line of 1.5 mm×1 250 mm strips.

Key words： hot rolled strip attenuation of crown in rolling direction CVC axial shifting of work roll online adjustment of bending force

Received: 11 May 2023

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	Articles by authors
	WANG Xiaogong
	LI Hongbin
	KONG Chao
	TIAN Yaqiang
	LU Jianlong
	CHEN Liansheng

Cite this article:

WANG Xiaogong,LI Hongbin,KONG Chao等. Research and application on threefold regulation of crown distribution in rolling direction of hot-rolled strip[J]. Iron and Steel, 2023, 58(10): 92-101.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230244 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I10/92

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