Lateral Roll Force in Asymmetrical Rolling and Its Influence on Rolling Stability.

Abstract

Roll system forces and their relationships with each other during asymmetrical rolling have been studied for deciding the direction and magnitude of the lateral roll forces that could affect the rolling stability, rigidity and loading conditions of a rolling mill. Results obtained from experiment is in agreement with theoretical analysis which indicates that kinematical asymmetry in strip rolling creates lateral roll forces and magnitude of the forces is dependent on the angle of force inclination affected by roll speed mismatch ratio i, pass reduction e and applid strip tensions T. It has been found that, for optimizing mill design and operation, front tension (or tension difference) in asymmetrical rolling should not exceed the level which is required to preserve rolling stability. The appropriate value of i should not be higher than 1.28 to avoid bearing overloading whilst still retain roll force reduction characteristics of cross shear rolling.