Abstract
The performance of aerostatic spindle is highly affected by the fluid–structure interaction effect between solid structure and air film. In working condition, the viscous heat generated by air film...
Highlights
Aerostatic spindle is widely used in the precision equipments, for example, ultra-precision machine tool, precision turntable, due to its unique advantages of high speed, negligible friction, and excellent rotation accuracy.[1,2,3] The aerostatic spindle is made up of the structure components and the fluid film
The aerostatic spindle is designed hope to with high stability and high precision, while there are too many factors affect the performance of the aerostatic spindle, such as the fluid–structure interaction effect between the structure components and the fluid film, the thermal generated in high rotation speed
Under the pressure of air film and temperature load, the maximum deformation of structure reaches 1.414 mm. It accounts for 11.8% of the thickness of air film, which means that the static character, such as load-carrying capacity and static stuffiness, differs from original design
Summary
Aerostatic spindle is widely used in the precision equipments, for example, ultra-precision machine tool, precision turntable, due to its unique advantages of high speed, negligible friction, and excellent rotation accuracy.[1,2,3] The aerostatic spindle is made up of the structure components and the fluid film. The basic working principle of the aerostatic spindle is that the externally pressurized air forms a thin film in the clearance between shaft and shaft sleeve after throttling action of restrictor, and the air film forces oppose the external load and maintain the separation of the surfaces of shaft and shaft sleeve.[4,5,6] The aerostatic spindle is designed hope to with high stability and high precision, while there are too many factors affect the performance of the aerostatic spindle, such as the fluid–structure interaction effect between the structure components and the fluid film, the thermal generated in high rotation speed All of those factors will reduce the accuracy of the aerostatic spindle. Li and Ding[11] investigated the influence of geometrical parameters on bearing performance and pointed out that the orifice length has significant influence on bearing performance when the orifice diameter is excessively small
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