Method of reducing waste in the rolling of strip segments interconnected by weld seams
AssigneeBWG Bergwerk- und Walzwerk-Maschinenbau GmbH
InventorsRolf N{acute over (oe)}, Andreas Noé
Life of this patent
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Abstract
A tandem strip-rolling line has a strip store between the mill so that when the upstream mill is open on the approach of a weld seam joining successive lengths, the downstream mill rolls strip stored in the strip store and conversely when the strip is halted upstream of the second mill, the strip is rolled in the first mill and fed to the strip store.
Claims18
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.
A tandem strip-rolling line for continuous rolling of metal strip having weld seams connecting successive lengths thereof, comprising:
- an upstream first rolling stand and a downstream second rolling stand for rolling said strip;
- a strip storage between said rolling stands for storing said strip;
- and
- control means for:
- 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 there through 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.
Dependencies are inferred from the claim text.