Static And Dynamic Characteristics Analysis And Structural Optimization Of SK7732 CNC Worm Grinder Spindle System

With the continuous development of CNC machine tools, machine tool processing accuracy, stability and other major parameters of the requirements are getting higher and higher. CNC grinding machine as an important mechanical processing equipment, the performance of its spindle has a direct effect the performance of the grinding machine. In this thesis, the influence of the bearing stiffness, bearing type and bearing span of grinding spindle on the static and dynamic characteristics of the spindle was studied by using the finite element software ANSYS, taking the SK7732 CNC worm grinding machine spindle as an example.The main work done is as follows:(1) Taking the SK7732 CNC worm grinding machine spindle as the research object, the finite element model of two sets of spring damping and six sets of spring damping were established. The modal analysis of the two finite element models were carried out, and a reasonable and effective finite element modeling method of grinding spindle is obtained.(2) Based on the finite element model of two sets of spring damping, the variation of static deformation and natural frequency of spindle are compared with the variation of radial stiffness, bearing type and span variation, and the influence of parameters of spindle structure on its static and dynamic characteristics is obtained.(3) Using the finite element structure optimization function, the influence of structural parameter on the static deformation and the natural frequency was analyzed under the condition of minimum volume and second order amplitude,, and the optimal structural parameters of the spindle were obtained.The research of this paper provides a theoretical basis for the grinding machine manufacturing enterprises to improve the performance and manufacturing efficiency of the grinding machine spindle, and provides a theoretical basis for saving the production cost.