Study On Tribological Properties Of Textured Rolling Bearing

Rolling bearings are the key supporting parts of mechanical equipment.In extreme conditions,severe lubrication environment is easy to cause the wear-out failure of the contact area in rolling bearings,and then lead to the failure of rolling bearings and the main engine.In order to improve the tribological performance of the rolling bearings,the micro-texture technology is led to the design of rolling bearings.The failure mechanism of friction and wear between the key contact area of the textured rolling bearings under different working conditions and texture parameters are revealed in the theoretical analysis and experimental research.By integrated the micro-texture model and Hydrodynamic Lubrication(HL)method,the influence of single texture parameter on the contact area of rolling bearings is studied.The results show that the oil film load capacity and pressure increase with the texture size increases.As the texture depth increases,the oil film load capacity increases first and then decreases.As the slip-to-roll ratio increases,the thickness of the oil film between the roller and the textured surface gradually decreases,which also reduces the oil film load capacity on the contact surface.A textured thermal elastohydrodynamic direct coupling analysis method is proposed to study the influence of multiple parameters on the lubrication performance of the textured rolling bearing.The temperature increases first and then decreases as the texture size increases.By compared to circle,square texture and cross texture,the temperature on the contact area with the cross texture can obviously decrease.As the depth of the texture increases,the temperature on the contact area gradually increases.A higher slip will increase the temperature on the contact area,so the skidding of textured rolling bearing is still the main factor affecting on the temperature distribution of bearing.In order to obtain the friction heat distribution of the textured rolling bearings,the finite element analysis method under the specific operating conditions of rolling bearing is established,the temperature changes of the textured rolling bearings are calculated.The results show that the temperature has an increase trend as the increase of slip factor,and the highest temperature under different slip factor is in the inner ring.Finally,the temperature changes on contact area with circular texture,square texture and cross texture are compared,the results show that the textured rolling bearing with cross texture can produce a lower temperature under the same working condition.The tribological performance of the textured rolling bearing is carried out by experimental.By used Taguchi method,the inner ring speed has a significant influence on the temperature of the textured rolling bearings,which is verified by a confirmation experiment.The influence of conditions parameter and texture parameters on temperature and friction coefficient is studied,the results show that the inner ring speed has a larger effect on the tribological properties of the textured rolling bearings,and the temperature rapid rise at first and then slow rise with the increase of inner ring speed.Moreover,the deep texture is not conducive to reduce the temperature on the textured rolling bearings.The white light interferometer is used to measure the surface micro-morphology of the textured rolling bearing before and after the test.The results show that the surface roughness of the textured rolling bearings is reduced after the test,the possible reason is that the wear particles contained in the texture area which reduces the scratches on the surface.Comparing the experimental and theoretical temperature results,the results show that the errors between them are within 3℃,which verifies the validity of the theoretical analysis model in this paper.