Research on the Behavior and Effects of Flatness Control in Strip Temper Rolling Process

Abstract

A new indicator is proposed that can describe flatness control effect—ultimate longitudinal plastic extension strain difference and the plastic deformation of strip in the rolling process is divided into two states according to the behavior of flatness control, active state and saturation of shape control. The temper rolling process is modeled by the nonlinear elastic-plastic finite element software called ABAQUS. The influence law of the yield strength of strip on the behavior and effect of flatness control is revealed. The difficulty in flatness control of high strength / ultra-high strength strip in temper rolling is interpreted. The relationship between the value of ultimate longitudinal plastic extension strain difference and yield strength of strip is directly proportional. When the reduction distribution in the width direction of strip is within a certain range, the plastic deformation of the strip is in active state of shape control. When the reduction distribution in the width direction of strip is over a certain range, the plastic deformation of the strip is in saturation of shape control. When the plastic deformation of the strip is in active state of shape control, reduction in the middle of strip and its front and backward tension all have little effect on the distribution of longitudinal plastic extension strain difference. When the plastic deformation of the strip is in saturation of shape control, reduction in the middle of strip and its front and backward tension all have effect on the distribution of longitudinal plastic extension strain difference.