Metal sheet surface characterization prior to and after processing by areal roughness parameters

Abstract

The surface topography and roughness are important in describing the lubrication of surface in deep drawing process. Although the profile parameters are commonly used for engineered surface roughness characterization in deep drawing, they don’t contain information on spatial asperities and voids variation, real contact areas distribution and volumetric lubricant retention capabilities. Unlike the profile parameters, the areal parameters can map geometrical features of scanned surface area and provide insight into the functional behavior. The objective of this paper is to examine and quantify the changes in spatial roughness, which are occurring before and after deep drawing process. We evaluate eight areal amplitude parameters at tin plate and can surfaces. Since we investigate the possibilities of lubricant dosage optimisation from ecological aspect of deep drawing cans processing, the areal surface parameters that are related to voids are investigated. Results indicate the usefulness of selected set of areal parameters for characterization of tin plate surface prior to and after deep drawing processing. Selected set may be used for potential prediction of surface volumetric lubricant retention capabilities.