Process for rolling flat material and strip

Abstract

The present invention relates to a process for rolling a roll material through a roll stand having work rolls and support rolls and having devices for balancing and positively and negatively bending the work rolls mounted in chucks of the work rolls. The process includes setting a balancing force by moving the work rolls against the support rolls without clearance when the roll gap is open by using the piston-cylinder units for positive and negative roll bending, setting the pressure in the piston-cylinder units for negative bending so as to attain the roll gap correction needed under load to control the profile and flatness of the roll train and setting the pressure in the piston-cylinder units for balancing and positive bending higher than the amount of balancing force needed. The piston-cylinder units are controlled for exerting a roll force including the positive bending force and the negative bending force on the work rolls when the roll material is inserted in the roll gap and expands the roll gap to a desired size. The piston-cylinder units are also controlled for exerting the balancing force on the work rolls after the end of the roll material exits the roll gap.