Method for the static and dynamic control of the planarity of flat rolled products

Abstract

Method to control the planarity of flat products rolled with a rolling stand (10) having a pair of working rolls (11a, 11b), a corresponding pair of back-up rolls (13a, 13b) and at least an intermediate roll (15a) placed between one of said working rolls (11a) and a corresponding back-up roll (13b), axial translation means (16) and first bending means (17) associated with at least one of said working rolls (11a) to translate it axially (WR shifting) and respectively bend it (WR bending), crossing means (19) associated with said intermediate roll (15a) to arrange it with its longitudinal axis (25a) inclined (IR crossing), that is, rotated on a horizontal plane, with respect to the longitudinal axes (21a, 21b, 23a, 23b) of said working rolls (11a, 11b) and of said back-up rolls (13a, 13b), and second bending means (20) associated with said intermediate roll (15a) to bend it with respect to the horizontal plane (IR bending), said method providing a first static setting step, operating selectively at least on WR shifting and on IR crossing, and at least a second dynamic setting step, that is to say, during rolling, operating selectively at least on WR bending and IR bending.

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