| The spindle system is a critical problem in the development of modern manufacturing technology. In this study, we carried out a structure parameters design for a VMC(Vertical Milling Center) series milling spindle and researched on the static and dynamic characteristics to lay a foundation for the industrialization. The thesis includes the following parts:(1) The basic design of the electric spindle structure including the overall layout, the structure parameters and choices of the spindle motor and bearings.(2) The static analysis of the electric spindle structure by ANSYS Workbench. It is confirmed that the designed electric spindle static stiffness meets the demands of static requirements.(3) The optimization of the electric spindle structure. The Ansys Design Xplorer model of Ansys Workbench was utilized to investigate on varies of front spindle overhangs (a) and support spans (L) thus obtain the optimal parameters for the high spindle static stiffness.(4) The Analysis of electric spindle dynamic characteristics by Ansys Workbench to determine the low-order natural frequencies and vibration models and calculate the critical rotational speed to check whether it meets the demands. Then we obtained the natural frequencies of the electric spindle system excited by a sinusoid signal. Though the optimization design, the rotation speed can be set out of the resonant range of the spindle system.(5) Simulation on the thermal state of spindle structure by the internal heat source and heat generation rate analysis. Through the simulation, the thermal properties for the various rotation speeds at the constant power were analyzed to plot the thermal analysis graph. Based on the temperature rise analysis, the improvement methods were proposed. |
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