Investigation of the Effect of Rolling Parameters on Roughness Transfer by Skin-Pass Rolling to AISI 304 Stainless Steel Sheet Materials

Abstract

The surfaces of sheet materials must have a certain roughness profile in terms of paintability and forming. As well as low roughness of the surface may reduce the adhesion of paints/coatings, excess of paint/coating may lead to rusting as a result of insufficient of paint/coating also excessive use of paint/coating will cause increased costs. For these reasons, the surface of sheet material is desired an optimal level of roughness. Roughness profile is transferred to surface of sheet materials by special roughing rollers, commonly known as skin-pass rolling. Roughness profile transferred to the sheet material surface is influenced by the rolling parameters. In this experimental study, it was investigated effect of the reduction ratio, rolling speed, roll roughness, lubrication conditions and material thickness on the roughness transfer by skin-pass rolling to AISI 304 stainless steel sheet materials with high yield strength and elongation ability, which are used extensively in the automotive industry and the roughness distribution was evaluated with the help of material ratio curves. Roughness transfer ratio increased as the reduction ratio increased. Roughness transfer ratio decreased with increasing material thickness, roll roughness, under the conditions of using lubricant. It was concluded that the increase in rolling speed had no effect on the roughness transfer ratio. Also, it was concluded that a more homogeneous roughness distribution can be achieved by choosing low reduction ratio, low rolling speed, low roughness roll, thick material and lubrication conditions.