Dynamic Characteristic Analysis In The Motorized Spindle System Of High-Speed Milling Machine

Dynamic characteristic analyses of structural systems have become increasingly important in structural dynamics field. The performance of high-speed machine tool mainly depends on its dynamic behavior, which directly influences its final working accuracy. That is to say, high-speed machine tools need good dynamic behaviors.The dynamic characteristic analyses in the structures are required to accurately describe structural systems in theory. One new method is to apply Finite Element Method which changes continuous systems into detachable structures combinated by nodes to create theoretical calculative model. With FEM engineers can not only improve and optimize the present structure of machine tool, but also can develop new products. It can avoid the trial-manufacturing process in conventional designs. It is prominent that product developing cycle and design costs are reduced by FEM.In this paper, the research is about some certain high-speed milling machine. After having described the research situation of structural dynamics, the author applies fenite element method to analyse the dynamic behaviors of the motorized spindle system in different working situations according to elastics and modal analysis theory.The author constructe the finite element models of the electronic spindle system in ANSYS, synthetically consider improving accuracy and reducing calculative time. He also has roughly handled the joint of the combination structure and properly dealed with boundary conditions.This paper carries out dynamic characteristic analyses on the components and the entire theoretic model to gain its natural frequency and mode shapes, which should be verified by modal experiment.Based on the modal analysis the author analyses the dynamic stability of system to verify whether its strength, stiffness and working accuracy can satisfy the requirements in high-speed cutting.