Accuracy of Disk Method to Predict Roll Residual Stress by Measuring the Sliced Disk Stress

摘要

Bimetallic rolls are widely used in steel rolling industries because of the excellent hardness, wear resistance and high temperature properties. Controlling the residual stress distribution is necessary since the compressive residual stress at the surface may improve fatigue life though the tensile residual stress at the center may reduce the strength. Therefore, it is necessary to measure the residual stress distribution from the surface to center correctly to ensure the roll quality. The disk method has been widely used in predicting the roll residual stress by measuring the stress of the thin sliced disk from the roll. In this study, therefore, the relation between the original roll residual stress and the sliced disk residual stress is investigated for the single material roll and bimetallic roll on the basis of thermo-elastic-plastic FEM analysis. The effect of the quenching time is discussed as well as the effect of the sliced disk thickness on the residual stress.