Optical interferometry for assessing lubricating film properties

Abstract

The study investigated the influence of rolling speed and lubricant properties on the formation of a lubricating film in point contacts. The film thickness was measured using optical interferometry, which provides high-precision, real-time data. Experimental tests were conducted on a specially designed rig simulating rolling conditions in bearing assemblies. Analysis of various lubricants showed that kinematic viscosity, base oil type, and chemical composition significantly affect the lubrication behavior and film formation regime. It was found that increasing rolling speed leads to a transition from boundary to hydrodynamic lubrication, with substantial changes in film thickness. The results can be applied to optimize lubricant selection in bearings of precision mechanisms