Abstract
The paper describes an analytical model for calculating an extreme pressure lubricant layer thickness with an allowance for oil absorption capacity of contacting surfaces. The model is practically assessed in laboratory conditions. The experimenting work shows that the speed of the relative displacement of contacting surfaces and the oil absorption capacity of their rough layers contributes to the thickening of the lubricant. The analysis of the results shows that it is the oil absorption capacity of rough layers that has the strongest influence on the change in the thickness of the extreme pressure lubricant layer.
Highlights
The main reason for a failure of units and mechanisms is not abreakdown of parts under the influence of increased or peak loads, but the wear of contacting surfaces
The equation takes into account geometricand physical characteristics of contacting surfaces, as well asaprocessingmethod. The dependence makes it possible to calculate a thickness of a lubricating layer when surfaces are in contact,regarding their relative displacement and oil absorptioncapacity of theirrough layers
The experimental studies carried out in laboratory conditions with an aim to determine a thickness of a lubricating layer between contacting surfaces shows that oil absorption capacityof rough layers has the greatest influence on the change in the thickness of a lubricating film in friction assemblies
Summary
The main reason for a failure of units and mechanisms is not abreakdown of parts under the influence of increased or peak loads, but the wear of contacting surfaces. Numerous studies show that friction surfaces withoil-retaining geometry have significantly better tribotechnical properties [1,2,3,4], and the insufficient oil absorption capacityof contacting surfacescan resultin adhesion and more intensive wear of friction assemblies in the course of breaking-in and wear of microprotrusions. Oil absorptioncapacity is understood as an ability of a surface to accumulate a certain amount of lubricant, which goes to a friction contact in the event of oil starvation. As for the work of a friction couple (in the event of a relative displacement of contacting surfaces), oil absorption capacity is the most important and essential property if we speak about real processes of tribology application in metallurgical and othertypes of equipment. To increase oil absorption capacity of rough surfaces, various ways of forming oil retaining micro relievesare used. The micro relieves look like a system ofgrooves and cavities with a closed or open profile to accumulate a lubricant [4,5]
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