Mechanical Characteristics Of High Speed Precision Ball Bearing And Stability Analysis Of Cage

Rolling bearings are the main basic components of rotating machinery and equipment today,and with the continuous rapid development and progress of industry,the demand for performance is also rapidly developing towards high speed,high precision,high rigidity and other aspects,so higher requirements are put forward for the performance of bearings.The mechanical characteristics and performance of the bearing are not only crucial to the performance of the spindle,but also crucial to the research and design of the bearing and the spindle.These parameters are also influenced by many factors such as the structural size of the bearing,machining errors and working conditions,which will have a certain impact on the service life of the bearing.Based on this,the following studies will be carried out:In this thesis,the related basic theories such as structural parameters and mechanical characteristics of ball bearings,such as Hertz elastic contact theory,ball bearing kinematics,ring control theory,etc.,are expounded,and the mechanical model of angular contact ball bearings is established based on these related theories,and then the relationship between bearing clearance and initial contact angle,and the relationship between ball load and contact deformation are obtained.Using Matlab,a set of programs that can solve the mechanical model numerically are compiled,and the changing rules of contact angle,load distribution and rolling ratio of angular contact ball bearings under different loads and different rotating speeds are analyzed.In this thesis,based on high-speed image technology,trajectory fitting technology and error separation technology,a method of measuring and evaluating the running stability of cage based on graphics is proposed,and a set of test-bed for measuring and evaluating the running stability of cage is set up correspondingly.The moving images of the reserved mark points on the end face of the cage are obtained by the high-speed camera,and then the movement tracks of the mark points are tracked and output by the professional image analysis software,thus realizing the high-precision non-contact measurement of the running stability of the cage.The components and causes of cage operation errors are studied,and the repeated operation errors and non-repeated operation errors of cages are separated in frequency domain.Based on this,the cage stability measurement and evaluation method is established.With the aid of the designed measuring and testing system,the running stability of the cage under different axial loads and different spindle speeds is studied,and the corresponding change rule is obtained.The running stability of the bearing cage is also one of the key factors that affect the service life of the bearing,so it is very important to study the measurement and evaluation of the running stability of the cage,which is of great significance to the optimization design and life prediction of the bearing.