Patent ID: 8539804

Claim:
A method for controlling a roll gap when rolling a strip ( 1 ) having lateral edges in a rolling mill including at least two rolls ( 3 a - b , 4 a - b ), and at least two roll gap actuators ( 6 , 7 ) positioned to be adjacent the respective lateral edges of the strip ( 1 ) and which independently control size of the roll gap, wherein the method comprises the steps of: receiving information on amount of wedge shape (H, POSact OS , POSact DS ) in strip thickness profile across strip width, determining relative reduction of the strip ( 1 ) by the formulas Δ h/H or Δ h/h , where Δh=H−h, with H denoting thickness of the strip ( 1 ) before entering the roll pap and h denoting thickness of the strip after passing through the roll gap, and based thereon, controlling said actuators ( 6 , 7 ) such that the relative reduction (Δh) of the strip ( 1 ) at both edges of the strip ( 1 ) is substantially identical.