Ishikawajima-Harima Heavy Industries Co., Ltd.

Kazuyuki Satoh

Hisashi Honjou

Toshio Iwanami

Masayoshi Satoh

Hajime Ishi

The rolling mill includes upper and lower work rolls, a roll bending apparatus for applying a bending force to the upper and lower work rolls, a roll shifter for axially shifting the upper and lower work rolls in opposite directions, and a back-up roll for supporting the upper and lower work rolls. The upper and lower work rolls have a bus having a contour comprising first to fifth regions. The rolling mill is adapted to have the large changability of plate crown effected by the roll shifting on plates with narrow or intermediate widths. The use of a combination of roll shifting and roll bending causes contours of the upper and lower work rolls to overlap deflection of the upper and lower work rolls, resulting in that a smooth roll diameter profile across the width of the plate to be rolled where the upper and lower work rolls contact the plate. Thus, it is possible to minimize the difference in a roll diameter, and to enhance the plate crown controllability, even for a plate having an intermediate or narrow width.

Method for rolling a plate and rolling mill both using roll shift and

A rolling mill includes a roll barrel having a straight region disposed at the middle thereof, sub-crown control regions disposed at both ends thereof, and main-crown control regions disposed between the straight region and the sub-crown control regions. The roll barrel has an outer surface having a bus bar which is a straight line inclined to a longitudinal axis of the roll barrel in the straight region, steep convex and concave curved shapes in the main-crown control regions, and gentle convex and concave curved shapes in the sub-crown control regions. The roll barrel has both ends having a diameter approximately equal to each other. The roll provides a large degree of freedom in designing curves to be applied to an outer surface of a roll barrel with the result that a larger crown control can be performed, and has a small number of factors for a vibration of a plate. The roll shift type rolling mill in accordance with the invention decreases an irregularity in plate thickness distribution at ends of a plate even when a plate having a width larger than specific maximum plate width is to be rolled.

Growing community of inventors

Yokohama, Japan

Kazuyuki Satoh