APPARATUS AND METHOD FOR PRODUCING DIFFERENTIAL THICKNESS STEEL PLATE HAVING TAPERED PLATE THICKNESS DIFFERENCE IN PLATE WIDTH DIRECTION

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and a method for producing a differential thickness steel plate, allowing for inexpensive production of a tapered differential thickness steel plate in a plate width direction having a large plate thickness difference in the plate width direction.SOLUTION: The apparatus for producing the differential thickness steel plate having the tapered plate thickness difference in the plate width direction includes a plate mill. The plate mill includes on the inlet side of a broadside mill: a device for measuring or inputting a width of a slab; a measuring instrument for measuring a rotational speed of a work roll of the broadside mill; a rolling length calculation device for calculating a rolling length using a measured value of the rotational speed of the work roll; a pattern input device for inputting a pattern of the rolling length and a plate thickness in advance; a device for controlling a roll gap based on a signal of the pattern input device and the rolling length measuring device; a position adjusting device for controlling a position of the turned sheet to an optional desired position with respect to a rolling line in accordance with a cross-sectional shape of the turned sheet; and a device for controlling the roll gap of a finishing mill in such a manner that the crown ratio of the cross-sectional shape of the sheet does not change.