| With the development of high speed precision machining technology, pneumatic spindle also got great developed. As pneumatic spindle use compressed air as the power input, it has many characteristic such as clean、quiet、simple structure and easy to maintain. Spindle is an important unit in high speed precision machining; the most used spindles are electric spindle and pneumatic spindle. The application of electric spindle and pneumatic spindle are in different cases due to their different principle and structure. Compared with the electric spindle, pneumatic spindle has great advantage. In this study, the high speed and high precision air spindle is studied in order to meet requirements of precision machining.A kind of pneumatic spindle with air-bearing and air-driven is introduced in this thesis. Based on preliminary study at the laboratory and actual conditions, the study focuses on the structure design of the spindle system and numerical analysis method of air-bearing and turbine blade. The main research contents are as follows:(1) The layout of the spindle system is analyzed. The turbine blade is selected as power input by the compressed air. The axial and radial static air-lubricated sliding bearings including journal bearing and thrust bearing are made of copper. The structure of the spindle is designed such as gas pass path and seal etc.(2) Air-lubricated sliding bearings are designed and calculated in detail, and small hole throttle’s structure is used in air-bearing according to layout of the spindle system. Based on computer simulation, the study of bearing performance such as load-carrying ability, rigidity, friction power etc is modeled by software Fluent.(3) The profile of turbine blade plays an important factor to affect the output torque of the spindle, and the parabola structure is selected to design the turbine blade. Its specific size is also calculated and3D model is designed by parametric method, then it’s also analyzed by finite element method. |
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