JPS5639101A - Continuous rolling plant for strip - Google Patents

Abstract

PURPOSE:To make the plant size small, and to contrive the improvement of the product's dimensional accuracy, by installing the single-pass rolling mill provided with the outer work roll pair and the inner work roll pair both being aligned in the same center line, behind the single-stand multipass continuous rolling mill provided with the outer work roll pair and the inner work roll pair whose centers are respectively shifed to a specified direction from the center line of the outer work roll pair. CONSTITUTION:In the single-stand multipass continuous rolling mill 5, the material S is rolled while the tensions T1, T2 are given it. Hereupon, the material S is rolled under the condition that the center A of the inner work roll 11 is shifted in the direction opposite to the direction of the tension T1 from the center line l connecting centers of the outer work rolls 13, 14, and besides, the center B of the inner work roll 12 is shifted in the direction opposite to the direction of the tension T2 from the center line l. Hereby, the diameter of the inner work rolls 11, 12 can be made small, and the rolling load can be reduced, so that the high draft rolling work becomes possible. Then the material S, being subjected to the high draft rolling work, is rolled by the vertically symmetric single-pass rolling mill 9 for regulating the finishing thickness and the surface condition and for correcting the shape of the product strip.