热轧薄带平整机支撑辊辊型优化的研究与应用

doi:10.13228/j.boyuan.issn0449-749x.20210653

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Abstract The roll length of a hot rolled thin strip temper rolling mill is 1 800 mm and the strip length is 1 320 mm. The difference between the two is too large, which results in the too large length of harmful contact area between work roll and backup roll. Under the action of roll bending, the peak stress is concentrated at the strip edge. With the extension of rolling kilometers, the edge wear of work roll intensifies, which is not conducive to the later shape control and shorten the life of roll. In view of work roll uneven wear problem for hot rolled thin strip temper rolling mill, the backup roll profile curve was designed. Through the chamfer design at both sides of the backup roll, the length of harmful contact area between the work roll and the backup roll was reduced. With the help of numerical simulation, a three-dimensional elastic-plastic finite element model of temper rolling mill was established to simulate the roll usage under different temper rolling processes and roll profile parameters. It was compared and analyzed from four evaluation indexes, shape control efficiency, crown adjustment region, lateral stiffness of bearing roll gap and contact stress of work roll. The simulation results show that three roll profile improves the stress distribution uniformity of the work roll, helps to improve the service cycle of the roll. The length of harmful contact area between rollers is significantly reduced. The regulation efficiency of bending roll force is increased from 0.048 μm/kN to 0.130 μm/kN. Considering the risk of the strip running deviation, if the chamfer insertion of the backup roll is too large, the chamfer of the backup roll is easy to jump into the strip steel, resulting in edge tension or even belt breakage. Therefore, the V + 25 roll profile with the smallest chamfer insertion amount was selected and applied to the site commissioning. The field data show that flatness control ability of the temper rolling mill is significantly increased, and the roll tonnage per unit rolling cycle is significantly increased. The average life of work roll is increased from 1 500 t to 1 800 t, and the product qualification rate is increased from 95% to more than 98%.

Key words： temper rolling mill roll shape design numerical simulation regulation effect of bending roll force adjustment domain of bearing roll gap lateral stiffness uniformity of stress distribution

Received: 11 October 2021

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	Articles by authors
	ZHANG Jian-lei
	ZHANG Jie
	QIN Song
	LU Jia-dong
	YUE Chong-xiang

Cite this article:

ZHANG Jian-lei,ZHANG Jie,QIN Song等. Research and application of backup roll profile optimization for hot rolled thin strip temper rolling mill[J]. Iron and Steel, 2022, 57(4): 79-87.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210653 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I4/79

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