Research On Contact Properties And Optimization Design Of Deep Grove Hybrid Ceramic Bearings At High-speed

The ceramic rolling bearings derived from conventional steel bearings and often used in high or ultra-high speed occasions. The ceramic rolling bearings have broad application prospects and huge economic benefits.As traditional bearing design method focuses on the low speed ball bearings and some theoretical researches and experiments of high-speed ceramic rolling bearings are complex and difficult to be accomplished, it is important and urgent to research on the design methods for high speed hybrid ceramic bearings. This paper mainly explores the contact problem of high-speed deep grove ceramic ball bearings based on the bearings theory of statics. The research works are listed as followings:A mathematical model based on the elasticity is used to calculate the deformation and the initial magnitude of interference between high speed thick-walled spindle and thin-walled bearing inner ring considering the impact of high-speed centrifugal force. Based on the contact nonlinear FEM, a 3D finite element mechanical model for interference fit between spindle and bearing inner ring at high rotating speed is established. The effects of the centrifugal force on contact stress and interference tolerance on the interference-fitting surfaces are simulated.The distribution of contact load of the hybrid ceramic ball bearings which are often used in high or ultra-high-speed occasions is changed due to the effect of centrifugal force. The paper conducted a supplementary analysis of the contact problem of hybrid ceramic ball bearing on high speed conditions based on Hertz contact theory.Based on the contact analysis modular in the ANSYS software the contact problem of the hybrid ceramic deep groove ball bearings at zero-speed is analyzed and compared with Hertz solution. The results calculated by finite element analysis compare well with Hertz's theoretical solution. Then the contact problem of the hybrid ceramic deep groove ball bearings on high speed conditions is calculated, the changes of bearing load distribution due to high-speed centrifugal force were simulated. The analysis plays an important role to improve its reliability and service life.Finally the paper carried on optimized design of the base based on the last part. While the deep hybrid grave ceramic ball bearing at 20000rpm speed was optimized to improve the service life using ANSYS optimization.