Effect of flow stress characteristic and process condition on width spread in horizontal hot rolling

Abstract

In horizontal rolling, the need for evaluating the effect of flow stress characteristic and process condition on width spread is necessary to control precision of width spread after rolling. With the right evaluation, we can know the significant factors that cause error between simulation results and experiment data. Hence, proper adjustment in input data will be perform to get better result. The effect of flow stress based on different material properties and process condition includes rolling velocity, friction between roller and strip and rolling temperature. With sets of simulations using Finite Element Method (FEM), we investigate the effect of each factor and determine the behavior of width spread after rolling with the changing of material and process condition. From the result of FEM simulation, the effect of rolling velocity and rolling temperature on width spread could be neglected. Friction has a slight influence on width spread. A series of simulations was conducted using different type of stress models such as constant model, Shida model, Minami model and general form of flow stress to investigate the effect of flow stress magnitude and its characteristic, which includes strain hardening and strain rate hardening, on width spread. The result showed clearly that the magnitude of width spread would not affect the width spread. Otherwise, the width spread is really sensitive to the change of flow stress characteristic.