Influence of lubrication on roughness crushing in skin-pass rolling of steel strip

Skin-pass rolling (or temper rolling) is usually the final process in the production of cold-rolled steel sheets. In operation, skin-pass rolling is performed with a lubricant with very low lubricating ability. However, relatively few studies have been reported in the literature regarding the effect of lubrication in skin-pass rolling. In this paper, the influence of lubrication on roughness crushing in skin-pass rolling is investigated by experimental rolling tests as well as numerical analysis by elastic-plastic FEM, especially focusing on differences in lubrication behavior depending on roll radius. The results with a large, operational size roll are well explained by the height characterization parameters and are considered to be reasonable from the viewpoint of classical knowledge in deep drawing tests and plane strain upsetting. It was found that some characteristics of skin-pass rolling related to lubrication are not properly simulated using small radius, laboratory size rolls due to insufficient contact length.