Patent ID: 6357273
Filing Date: 2002-03-19
Classification: B21B,B65H

Abstract:
A method of operating a tandem strip-rolling line for continuous rolling of metal strip having weld seams connecting successive lengths thereof with at least an upstream first rolling stand and a downstream second rolling stand so as to reduce the scrap length which must be cut from the strip at a weld seam, said method comprising the steps of:(a) reducing a speed of said strip upstream of said first rolling stand upon an approach of one of said weld seams thereto while continuing to roll said strip at said second rolling stand at a normal rolling speed; (b) delivering said strip at said normal rolling speed to said second rolling stand during step (a) from a store of strip in a strip storage located between said first and second rolling stands; (c) thereafter opening said first rolling stand, passing said one of said weld seams therethrough and closing said first rolling stand on said strip; (d) rolling the strip downstream of said one of said weld seams at said normal rolling speed; (e) while the strip downstream of said one of said weld seams is rolled in step (d) at said normal rolling speed, reducing a speed of said strip upstream of said second rolling stand upon an approach of said one of said weld seams thereto, and simultaneously storing in said strip storage a portion of said strip upstream of said one of said weld seams; (f) thereafter opening said second rolling stand, passing said one of said weld seams therethrough and closing said second rolling stand on said strip; (g) then rolling the strip downstream of said one of said weld seams in said second rolling stand at said normal rolling speed; and (h) repeating steps (a) through (g) for subsequent weld seams as said weld seams approach said first rolling stand.