INVESTIGATION OF THE INFLUENCE OF TECHNOLOGICAL PARAMETERS OF DISCRETE-TEXTURED OIL-BASED SURFACES FORMATION ON THE TRIBOSYS-TEMS FRETTING RESISTANCE
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 79, Issue
Abstract
A study was carried out to determine the effectiveness of increasing the fretting resistance of tribosystems by the formation of discrete-textured oil-based surfaces in the form of regularly located microcavities. Phenomonologically, such surfaces were considered as discrete-textured, and micro-depressions - as reservoirs, providing a permanent regeneration of the boundary lubricating layers in the zone of frictional contact. The formation of discrete-textured surfaces in the form of a system of hollow pyramidal and spherical microcavities with given texture parameters on the sample working surfaces was carried out by the method of shock-plastic deformation. The friction pairs with different location of materials in pairs according to hardness were studied. The pairs with discretely textured surfaces formed on a sample harder than the counterbody conventionally referred to as direct pairs. The pairs with discrete-textured surfaces formed on a sample of lower hardness than the counterbody hard-ness were called inverse pairs. It has been established that in the case of friction of polished surfaces in accordance with the accepted conditions, lubrication does not provide a significant increase in the fretting resistance of the investigated materials in both direct and inverse fric-tion pairs, which testifies to insufficiently high resistance of the boundary lubricating layers on such surfaces. Under the same conditions of fretting and lubrication, the resistance to fretting-corrosive wear of friction pairs with discrete-textured surfaces has increased significantly. The greatest effect of wear resistance increasing is achieved in direct pairs with the spherical micro-cavities profile. Compared to the base version the absolute value of wear of samples with spherical microcavities profile in direct pairs decreased by more than 6 times. At the same time, the counterbody wear and the total wear of pair also decreased noticeably. It is obvious that according to the accepted parameters of discrete-textured surfaces formation and pa-rameters of fretting, the spherical profile provides the greatest lubricating efficiency of the mi-crocavities compared with the prismatic profile. According to the results of the experiment, a statistical analysis was carried out and the regressive models of the dependence of wear on technological parameters of the discrete-textured surfaces formation and fretting parameters were developed.
Authors and Affiliations
M. V. KINDRACHUK, O. I. DUKHOTA, V. E. MARCHUK, V. V. KHARCHENKO, N. O. NAUMENKO
Keywords
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