Physical Phenomenon on Roll/Workpiece Interface during Rolling: Lubrication and Surface Oxide Scale

Abstract

In rolling processes, friction on the interface between the roll and workpiece is the most critical factor. It strongly affects not only deformation and load but also surface quality of the rolled material. Prediction and control of the friction are highly demanded. However, physical phenomenon on the interface has not been fully understood. Lubricant as well as surface oxide scale locates at the interface during rolling so that the two play important roles in frictional shear stress, surface deformation and heat transfer, especially in hot rolling. As flow stress of steels increases and better surface quality is demanded, tribological studies on rolling are required to develop new lubrication and scale technologies. In this article, past key studies on lubrication and oxide scale are reviewed and outlook for future tribology in rolling is given.