Study On The Tribological Behavior Of Reinforced Abrasive Bearing Rings With Microstructured Surface

Industrial robot bearings often have long-term high-speed,heavy-duty,vibration,high-temperature and other harsh working conditions.The impact friction between the rolling element and the bearing ring raceway is likely to cause damage to the lubricating oil film,resulting in wear failure of the ferrule raceway,thereby reducing the entire the service life of the bearing.As a method to effectively reuce the friction and wear and improve the lubrication condition of the friction pair,surface microstructure has been deeply concerned by many scholars at home and abroad.To this end,this paper proposes a method for improving the friction and wear properties of the bearing ring raceway surface microstructure,and carries out the enhanced grinding surface microstructure molding test,and studies the surface microstructure of the lubricating film with different strengthening grinding parameters.The influence of surface carrying capacity on bearing temperature was analyzed.The influence of surface microstructure oil film layer on the friction and wear performance of the ferrule raceway was investigated.The surface microstructure processed for strengthening grinding was applied to industrial robots bearings provide theoretical basis and technical guidance.In order to study the influence of the surface microstructure prepared by different intensified grinding process parameters(grinding time,injection pressure)on the bearing capacity of the lubricating oil film,the surface model reconstruction of the surface microstructure was completed by reverse design,and then the“film flow,shell”simulation physics module in COMSOL Multiphysics.The Reynolds equation considering the JFO cavitation model is used to simulate the unit area lubricant tilm bearing capacity in the surtace microstructure processed by different reinforced grinding parameters,The results of the solution show that the oil film between the surface and the rolling element is weaker than the bearing capacity of the oil film between the surface of the unreinforced abrasive sample and the rolling element.After the 5μm ultra-fine treatment of the reinforced abrasive sample and the unreinforced abrasive sample,the bearing capacity of the oil film in the surface microstructure of the partially reinforced abrasive sample exceeds the bearing capacity of the oil film in the surface microstructure of the unreinforced abrasive sample.When analyzing the influence of surface microstructure on bearing temperature different reinforced grinding process parameters(grinding time,injection pressure)are designed to strengthen the grinding of the ferrule raceway,and the ferrule is further super-finished by super-precision equipment.The operating temperature of the bearing is tested on board.Experiments show that some of the bearing rings that have been reinforced by grinding can effectively increase the bearing temperature during operation compared with unreinforced grinding bearing rings ? Smaller,combined with the theory of frictional heat dissipation of the bearing,it can be seen that the surface microstructure on the raceway of the ferrule after the enhanced grinding affects the rheological properties of the lubricating oil film and increases the heat dissipation area of the bearing.In order to explore the influence of the surface microstructure oil film layer on the friction and wear performance of the ferrule raceway in the fixed point area.The bearing ring of the 45-minute temperature test was completed as the research obiect in order to ensure that the ferrule and the super-precision bearing ring can be strengthened Under normal working conditions,the friction and wear tester is used to study the effect of surface microstructure on the friction and wear of the ferrule under different strengthening grinding processes.The study found that,in the case of oil lubrication,compared with the friction coefficient of the unreinforced ferrule sample and the steel ball against the grinding machine,the oil film layer stored on the surface microstructure of most of the reinforced ferrule raceway sample has the friction reduction effect;the surface hardness of all the reinforced ferrule specimens is higher than that of the reinforced ferrule specimens,and the wear of all the reinforced ferrule specimens is higher than that of the reinforced laps.The amount of wear of the sample is smaller.