Abstract: When ultra-thin strip is produced by 1 420 mm single stand universal crown mill(UCM), the intermediate roll migration has certain impact on the property of shape control of work roll bending force, intermediate roll bending force and intermediate roll shifting with rolling in reverse and positive direction. In this paper, the forced state of roll system is analyzed from the perspective of mechanics and a dynamic simulation model has been built using finite element software LS-DYNA to make a quantitative calculation of differences in control properties between no offset rolling of intermediate roll and offset rolling in reverse and positive direction. The calculation results show that there is a linear relationship between the work roll bending force and the strip crown when the intermediate roll has no offset, and the strip crown decreases along with the increase in work roll bending force. When the intermediate roll offset, the roll bending control effect is greater than that of no offset, and the roll bending control effect in the positive direction is better than that in reverse direction. The variation trend of intermediate roll bending force control property is similar to work roll bending force. The shape control ability of different intermediate roll shifting shows little change, and the control abilities of no offset rolling and rolling in reverse direction are basically the same. For rolling in the positive direction with the shifting range from 15 mm to 30 mm, the control ability is better than the other two rolling conditions.

Key words: finite element, intermediate roll migration, shape control, UCM cold mill, ultra-thin strip