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Effects of oil pocket shape and density on friction in reciprocating sliding
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Rzeszow University of Technology, Department of Manufacturing Technology and Production Engineering, Powstancow Warszawy 8, 35-959 Rzeszow, Poland
University of Rzeszow, Institute of Materials Engineering, College of Natural Sciences, Pigonia 1, 35-310 Rzeszow, Poland
Publication date: 2022-06-30
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(2):338-345
  • Laser texturing in most cases led to reductions in friction force values and variations.
  • The best tribological behavior was achieved for the pit-area ratio of 9%.
  • High friction was obtained for circular dimples of 22% and for sandglass shape dimples of 5% density.
  • Surface texturing caused the shift of the maximum friction from the transversal point.
The purpose of this work is to study the effect of oil pocket shape and density on friction in reciprocating sliding. The experiments were conducted in reciprocating motion under starved lubrication conditions. Tribological tests were performed using an Optimol SRV5 tribotester. The frictional pair consisted of two discs of 42CrMo4 steel. One disc was laser textured. The oil pockets had circular and sandglass shapes. Disc samples of various texture shapes were characterized by the same pit-area ratios. The operating parameters were the same for all friction pairs. In most cases, surface texturing led to reductions in friction force value and scatter. For both dimple shapes, the best tribological properties were achieved for oil pocket density of 9%. When discs with circular dimples were tested, the highest resistance to motion was received for the highest pit-area ratio of 9%. On the contrary, the worst tribological performance of discs with sandglass-shaped oil pockets of sandglass shape were obtained for the largest oil pocket density of 22%.
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