Abstract
The article presents the results of research of the influence of the rolling speed parameter during pure rolling and 20% rolling with slip on the kinetics of formation of the lubricant layer thickness in the central contact zone. The aim of experimental research is establishing the impact of operational parameters of friction pairs - speed rolling (a pure rolling and 20% rolling with slip) the dynamics of the process of forming the lubricant layer thickness in the central contact zone between contacting surfaces experimental «steel ball - glass disc.» Oils of various operational purpose were used in the research work, namely motor oils for gasoline and diesel engines (М8Г2К, М10Г2К), universal motor oil (SAE15w40LUX) and universal motorgear oils (ЄМТ-8, ЄМТ ПРОТЕК) (I-40). The increase in rolling speed was shifted from 0 to 1.8 m / s; at a volumetric temperature (об'ємній температурі) of oils 20°С; contact stress of 251.5 MPa. The thickness lubricating layer in contact was determined by optical interferometry. According to the results of experimental researches concerning determination of the lubricating action of oils in different composition and operational purpose, it was found that during the period of friction steam kinetics of the formation of the lubricant layer thickness depends on the rolling speed - with the increase of which there is an increase in the lubricant layer thickness in the central contact zone, leading to the establishment of appropriate lubrication modes (from boundary to hydrodynamic). Decisive role kinematic viscosity of the lubricant, which depends on the base of oils and quantitative content of the additives. Based on the experimental data obtained in conditions of the rolling with slip, favorable conditions for reducing the initial rolling speed by setting the maximum lubrication regime when using lubricant which contained surfactants with polar molecules. KEY WORDS: ELASTOHYDRODYNAMIC CHARACTERISTICS, ROLLING SPEED, CLEAN ROLLING, SUSPENSION ROLLING, THICKNESS OF THE LUBRICATION LAYER
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