The Effect of Dimple Distortions on Surface Topography Analysis

Abstract

In this paper the influence of improper selection of reference plane on dimples distortions was taken into consideration. The effect of application of various procedures (cylinder fitting algorithm; polynomial approximation; digital filtering: regular Gaussian regression filter, Robust Gaussian regression filter) were compared and discussed. Plateau-honed cylinder liner surfaces were studied (more than 20 measured and/or 20 with digitally added dimples surfaces were studied). They were measured by stylus instrument Talyscan 150 or white light interferometer Talysurf CCI Lite. The influence of usage of commonly applied algorithms on surface topography parameters (from ISO 25178 standard) was also taken into account. It was assumed that dimples distortion is of a great importance for calculation of surface topography parameters (especially of Sk parameters) of plateau-honed cylinder liners with additionally added oil pockets created by burnishing techniques. False estimation of areal form removal procedure can cause of classification of properly made parts as a lack and its rejection. The dimples size (width DW and depth DD) was also taken into consideration for proposal of selection of areal form removal procedure.