JPS5659504A - Rolling method - Google Patents

Abstract

PURPOSE: To reduce the fluctuation of the sheet thickness, by shifting one of upper and lower work rolls to the downstream side of the rolling line, by installing an intermediate roll between above center shifted work roll and the backup roll, and by driving this work roll at a low speed.

CONSTITUTION: The upper work roll 1 is suitably shifted to the downstream side of the rolling line, and its diameter is made as small as possible. The intermediate roll 5 is installed between the upper work roll 1 and its backup roll 3. The push roll 6 in the same length as the upper work roll 1 is arranged; and the backup roll 7, being suitably divided in the direction of the roll breadth, is arranged for the push roll 6, and is connected to the tranfer device 10 through the holder 9 in order to be transferrable in the straight line. The upper work roll 1 is driven at a low speed, and the lower work roll 2 is driven at a high speed. For controlling the shape of the rolled material 8, the transfer device 10 is operated so as to adjust the pushing force for the push roll 6 through the backup roll 7, and the distortion of the upper work roll 1 is freely adjusted for every position in its longitude. In the present method, because the upper work roll 1 is made in a small diameter and is driven at a low speed, the reduction of the rolling load can be attained.

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