Printing Behavior of Roll Surface Texture to Hot-dip Galvanized Steel Sheet in Temper Rolling

Surface texture plays at important role in product quality of steel sheet, which may reduce friction in sheet metal forming and improve paint appearance, especially in the automotive industry. Temper rolling is one of the key processes to determine the Surface texture. because it is finally printed by appropriate work-roll surface. However, the printing behavior of surface texture from work-roll to steel sheet ire not sufficiently understood, and the qualitative prediction are necessary for higher quality and adequate production operation. The requirements become larger for widely used hot-dip galvanized steel sheet, but the printing behavior has not been clarified. Therefore, the paper is concerned with the printing behaviors of roll surface textures on hot-dip galvanized steel surface in temper rolling. Firstly, the printing behavior is experimentally investigated by using different work-roll surfaces. Then, as representative parameters, average roughness, peak per inch and waviness are characterized. Also, the mutual relations among the parameters are discussed and possible method to predict the surface parameters is proposed and evaluated.