Modeling Of Rotary Error Of Deep Groove Ball Bearing And Analysis Of Error Influencing Factors

As the core part of mechanical system,bearing plays an important role in precision equipment such as machine tools.The slewing accuracy of bearing is closely related to the slewing accuracy of shafting,and the accuracy of shafting determines the accuracy of machine.Therefore,in-depth study of the influence factors of bearing rotation accuracy becomes particularly important.Taking the deep groove ball bearing as the research object,this paper establishes a five degree of freedom rotation error model of deep groove ball bearing,evaluates the rotation accuracy of the example bearing by using the invariant accuracy,and analyzes the influence of various factors on the rotation accuracy of the bearing.This paper has the following parts:The first part introduces the research background and significance of this paper,analyzes the research status of bearing rotation error at home and abroad,and leads to the main work of this paperThe second part briefly introduces the basic theory of deep groove ball bearing,Hertz contact principle and contact stiffness calculation,analyzes the shortcomings of traditional measurement and evaluation methods to lead to the error evaluation method based on invariants,and points out that the invariants accuracy evaluation method can describe the rotation error motion more objectively and accurately than the traditional measurement method without the influence of measurement points.In addition,the solution method and mathematical model of minimum spherical image curve and minimum collimator in invariant precision are described in detail.In the third part,a five degree of freedom rotation error model of deep groove ball bearing is established,which is based on the geometric displacement equation and force balance equation of the bearing parts,and comprehensively considers the coupling effect of the physical properties of the parts,geometric error and working load.The fourth part is to verify the model based on motion geometry and Adams motion simulation.Through the simulation of three common working conditions,and comparing the simulation results of Adams with the calculation results of bearing rotation error model,the correctness of the rotation error model is verified.In the fifth part,based on the five degree of freedom rotation error model of deep groove ball bearing,the invariants accuracy index is used to evaluate,and the influence of geometric error of different components,bearing structural parameters and working load on the rotation accuracy is analyzed,which provides a theoretical basis for the design and assembly of bearing parts.