Research On Mechanism And Optimization Of Superfinishing Process Of Zirconia Ceramic Bearing Raceway

As precise parts in precised high-end equipment,bearing plays a very important role.The precision of bearing will fundamentally affect the accuracy of equipment.Engineering ceramic materials have many excellent characteristics such as high strength,wear resistance,corrosion resistance,high temperature resistance and so on.If the engineering ceramic material is applied to the bearing,the bearing performance will be greatly improved,so as to improve the performance of precision equipment.Bearing performance is closely related with the quality of bearing raceway surface and raceway profile.As the last process of bearing raceway processing,superfinishing machining can greatly improve the quality of raceway surface and raceway profile.In this paper,the mechanism of superfinishing machining of ceramic bearing raceway and the optimization of superfinishing machining technology are studied in depth,so as to improve the raceway profile of the surface quality of ceramic bearing raceway and provide theoretical basis for practical processing and production.The research contents are as follows:(1)In this paper,the effect of various machining parameters of zirconia bearing raceway on the raceway profile of ceramic bearing raceway surface roughness was studied by superfinishing grinding experiment.In the process of superfinishing zirconia bearing raceway,the improvement rate of raceway surface roughness raceway profile in the rough supermachining stage is higher than that in the semi-supermachining stage and the fine supermachining stage.The change trend of raceway profile improvement rate with tangential speed of workpiece,long and short stroke swing speed of superfinishing stone pressure was obtained in the stage of rough,semi and fine machining.The influence of the factors of superfinishing on the improvement rate of raceway profile is obtained.The forming mechanism of raceway profile error is discussed,which can be divided into manual adjustment error and principle error.(2)The raceway superfinishing process of zirconia bearing was studied and optimized,the optimum process parameters of superfinishing are obtained:In the rough superfinishing processing stage,the workpiece tangent speed is 250-350M/min,the superfinishing stone pressure is 0.6-0.8N/mm2,the long stroke swing speed is 650-850U/min,and the short stroke oscillation speed is 1600-1900U/min.In the fine superfinishing processing stage,the workpiece tangential speed is 950M/min,the superfinishing stone pressure is 0.2?0.4N/mm2,the long stroke swing speed is 300U/min,and the short stroke oscillation speed is 1100?1400U/min.(3)The raceway model of zirconia bearing was established and the stress distribution on the raceway surface of zirconia bearing under different superfinishing machining parameters was obtained.The interaction between diamond superfinishing stone and zirconia bearing raceway surface was studied with the mechanism of superfinishing by observing the raceway surface before and after superfinishing.A large amount of plastic deformation was found on the surface of the raceway of zirconia bearing after superfinishing grinding..To sum up,in this paper the surface of bearing raceway of zirconia ceramic was studied by superfinishing grinding experiment and theoretical analysis,the mechanism of raceway superfinishing machining of ceramic bearing and optimize the process of raceway superfinishing machining of ceramic bearing was explored.The influence of various factors of superfinishing machining on the quality of raceway of engineering ceramic bearing was analyzed and the technological parameters of superfinishing machining of raceway of ceramic bearing were determined.The above research has certain scientific guidance and engineering application value for the manufacturing of high precision engineering ceramic bearing.