Components from 73 failed knee replacements (TKRs) consisting of rotating-platform, mobile-bearing and fixed-bearing implants were examined to assess the patterns of wear. The patterns were divided into low-grade (burnishing, abrasion and cold flow) and high-grade (scratching, pitting/metal embedding and delamination) to assess the severity of the wear of polyethylene. The rotating-platform gro...

Using thermal spraying various surface coatings consisting of different material compositions can be manufactured. Besides different solid phases the resulting coating microstructure often contains a non-negligible amount of pores. In this context a roller burnishing process with a hydrostatic ball-point-tool is examined to compact the thermally sprayed coating, thereby reducing porosity. The r...

K. Żak, W. Grzesik, M. Prażmowski, Opole University of Technology, Department of Manufacturing Engineering and Automation, Opole, Poland This paper presents a sequential machining process which incorporates CBN hard turning with cryogenic pre-cooling of the workpiece (CHT) and ball burnishing (BB). The main goal of this study was to select machining conditions enhancing the quality of parts mac...

The smoothing ball-burnishing process has commonly been used as a post-processing method to reduce the irregularities of machined surfaces. However, mechanism this rarely examined. In study, simulation procedure is proposed predict surface roughness burnished workpiece under varying burnishing forces. was firstly approximated by parabolic functions. then numerically simulated through two steps,...

Abstract The objective of the research is to analyze impact ultrasonic vibration assistance on wear resistance due topography enhancement caused Ti6Al4V cylindrical samples after surface modification through a ball burnishing process. process parameters considered for this study are force, number passes, and addition 40 kHz assistance, which thought enhance increase hardener effect in terms dep...

Ball burnishing is a very promising alternative to grinding because of it produces little environmental pollution. It can cause improvement the functional properties machine parts, such as friction and wear. The connection between ball lubricated fretting has not been analysed yet. In this study, was found that discs from titanium alloy Ti6Al4V caused decrease in height roughness up 84% an incr...