EVALUATION OF LUBRICANTS FOR COLD STRIP ROLLING

The lubrication characteristics during roll bite were evaluated by studying the friction coefficient, forward slip, rolling force and drive torque. Experiments were conducted on a laboratory rolling mill to assess the effects of these factors and the oil viscosity, surface roughness, reduction ratio and rolling speed on rolling behavior. Favorable lubrication conditions, indicated by a smaller forward slip and friction coefficient, were found when the reduction ratio or rolling speed was quite large. Cold rolling using a high viscosity lubricant is beneficial in reducing forward slip and friction coefficient. Increasing the isotropic surface roughness of the rolling strip can increase the friction coefficient and forward slip.