Patent ID: 8627702

Claim:
Method of rolling a metal strip, in which the metal strip passes through the a roll gap of at least one roll stand, the work rolls of the roll stand which define the roll gap being able to be shifted along their axes of rotation if differences occur in the shape of the roll gap from a desired shape, the method comprising a) shifting each of the work rolls in the same direction wherein a center of the work rolls moves relatives to a center axis of the metal strip, b) starting from a starting position (V 1 ), maintaining a given direction of shift (R+, R−) until a respective maximum shifted position (V 2 , V 4 , V 6 . . . , V 26 ) is reached at which a first change takes place in the direction of shift (R−, R+), c) maintaining the direction of shift (R+, R−) which has commenced in a given case until a maximum shifted position (V 2 , V 4 , V 6 . . . , V 26 ) is reached which, relative to the starting position (V 1 ), is larger in size than, or equal in size to, the maximum shifted position (V 2 , V 4 , V 6 . . . , V 26 ) which was reached previously in the opposite direction of shift (R−, R+), d) on the given maximum shifted position (V 2 , V 4 , V 6 . . . , V 26 ) being reached, reversing the direction of shift (R+, R−), e) repeating steps c) and d) until the size of the given maximum shifted position (V 2 , V 4 , V 6 . . . , V 26 ) has reached a maximum value (V 26 ), f) starting from the maximum shifted position corresponding to the maximum value (V 26 ), maintaining the given direction of shift (R−, R+) until a respective maximum shifted position (V 28 , V 30 , V 32 . . . , V 52 ) is reached which, relative to the starting position (V 1 ), is smaller in size than, or equal in size to, the maximum shifted position (V 28 , V 30 , V 32 . . . , V 52 ) which was reached previously in the opposite direction of shift (R−, R+), g) on the given maximum shifted position (V 28 , V 30 , V 32 . . . , V 52 ) being reached, reversing the direction of shift (R+, R−), h) repeating steps f) and g) until the given maximum shifted position (V 28 , V 30 , V 32 . . . , V 52 ) of the work rolls (A 1 / 1 , A 1 / 2 ; A 2 / 1 , A 2 / 2 ) corresponds to a minimum value (V 53 ), i) repeating a sequence of steps b) to h) if a worn state of the work rolls is within a permitted range, or the work rolls are replaced if at least one of them has reached a state which is outside the permitted range.