Investigation Of Large Titanium Alloy Thrust Hollow Ball Bearing

A kind of large Titanium alloy thrust hollow ball bearing is planned to be developed for the sake of the demand of the national defence. This thesis analyses a contact problem of thrust ball bearing based on ANSYS which is a kind of finite element software. Some of conclusions in the thesis can be used as the foundation of finite element analysis about thrust ball bearing in more complex environment, will become primary work about finding new rules and new analysis methods which are fit for the thrust hollow ball bearing.The route of analysis is from simplicity to complication, theories research and finite element research verifying mutually. Firstly, builting up a finite element model of general steel thrust ball bearing is analysized. Then, boundary conditions and the finite element model are proved to be suitable by the simulation results about contact shape, size and stress of thrust ball bearings which are compared with results from Hertz's contact theory. Secondly, the large steel ball bearing model is converted into parametric model with the same size as the Ti-alloy ball bearing. Elementary rated load is figured out. Deformations of the ball and raceway are calculated by finite element method with elementary rated load. The deformations are the most maximum deformations extent of Ti-alloy ball bearing according to the definition of elementary rated load. At last, the finite element models of the large Ti-alloy thrust ball bearing with solid roller and hollow roller respectively are built by modifying steel model parameters. The laws about stress and strain of hollow ball bearing are found by comparing the results from finite element models with light and heavy load. On this foundation, the finite element analysis method is combined with optimization theory, most suitable hollowness is gotten by optimization design about the hollowness of ball as design variable, the biggest deformation about roller and raceway as state variables, the volume of hollow roller as objective.The conclusions are as follows: 1.As the hollowness is less than 50%, the performance of stress and strain aren't almost different between thrust solid ball bearing and thrust hollow ball bearing. 2.As the hollowness is more than 50%, the deformation of hollow ball increases with the hollowness increasing. Max Mises stress has the law that first it rises,next descends,then rises again.