The Key Technology Research Of High Precision Aerostatic Motorized Spindle

With the advantages of high speed, high precision, high load-bearing and no-pollution, porous aerostatic motorized spindles are popular in the field of ultra-precision manufacture. In this paper, the key technologies of aerostatic motorized spindle were studied, including four parts such as the static characteristics of aerostatic bearings, the structure optimization, the manufacturing process analysis and the performance test. The specific content is as follow: The three-dimensional models of porous aerostatic journal and thrust bearings were built and the simulations were carried out with the Fluent software based on the finite volume method. The effects of the speed, the throttler, the pressure and the size on the characteristics of porous aerostatic bearings were studied. The models of spherical and cylindrical bearings were built and the loading capacity and stiffness were abtained with the Fluent software. The models of the "å·¥" type and the "T" types were built and the effects of the rotor structure and the motor position and size on the rotor modal were abtained with the Simulation module of the Solidworks software. The static thermal analysis and thermal structure coupling analysis were done with different material of rotor, and the rotor temperature and thermal deformation were calculated. The effects of the elliptical error and the concave convex flatness error of rotor on the characteristics of porous aerostatic bearings were studied. The manufacture precision of the rotor was tested with the Taylor Hobson cylindricity instrument. The spindle axis trajectory was measured with the Turbo software and so did the rotation accuracy. The the loading capacity and stiffness were measured with Tesa micro displacement sensor. The rotor modal test experiments were done with the Data Physics 730.