Investigation of impact of cutting oils on formation of surface defects during grinding

The paper proposes a new approach of evaluating the quality of cutting oils through the study of defects emerging on raceway surfaces of instrument bearings during profile grinding with use of different cutting oils. It has been also established that the wear of rubbing surfaces of bearings exposed to sliding friction generally depends on presence of defects and relates to fatigue fracture of the surface layer caused by repetitive thermomechanical exposures. Moreover, the wear rate depends on sizes and shapes of defects which act as stress raisers and so are of primary importance. Many experiments described in literature confirm that noise and vibrations directly depend on presence of defects on working surfaces of rolling bearings.