A quantitative evaluation of truncation wear based on three-dimensional surface asperity changes

摘要

In this research, the authors quantitatively evaluated in three dimensions the truncation wear in which some of the valleys of a virgin surface are preserved in small quantities and at the final stages of machining, basing this evaluation on measurement of multiple cross section curves with a stylus technique. In order to find the amount of wear over all regions of the friction surface, they found the friction surface formed by truncation by using height probability density function characteristics as seen from some coordinate system for the cross section curve set data and calculated the amount of wear from the distribution function of the height of this friction surface and the virgin surface. Since the friction surface is determined by the virgin surface, the authors applied a relocation technique in which the height distribution functions of the truncated surface already developed and of those regions of the virgin surface in which the forms existing in its valleys are preserved are optimally overlapped. This technique was applied at each stage of a friction and wear test under boundary lubrication with oil and the test shed light on the friction distance, amount of wear, and changes in location on the wear surface.