Multistage rolling mill with flatness control function

摘要

The present invention considerably improves the rolling mill in the flatness control function, by arranging either of a pair of upper and lower work rolls as a small-diameter roll, offsetting the small-diameter work roll by a required distance in the rolling direction, providing an intermediate roll between the small-diameter work roll and a backup roll, letting a vertical bending force act on the upper and lower work rolls and the intermediate roll, and letting a horizontal bending force act on the small-diameter work roll.