Abstract
The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product. To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article. An aerostatic spindle is optimized to elaborate the design procedure of the proposed method. In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness. Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle. Finally, optimal design parameters are acquired and experimentally verified. This research guides the optimal design of aerostatic spindles considering the FSI effect.
Highlights
Belforte [5] and Du et al [6] investigated the stiffness, load-carrying capacity (LCC) of aerostatic thrust bearings and journal bearings with pressure-equalizing groove (PEG), and found that the PEG can enhance the static performance of aerostatic bearing dramatically
104.8 N/μm, and the volume flow rate (VFR) is reduced by 27.2%, from 9.2 L/min to 6.7 L/min
The main conclusions are drawn as follows: 1. A two-round optimization design method is proposed to facilitate the design of the aerostatic spindle with consideration of the fluid–structure interaction (FSI) effect, and an aerostatic spindle is optimized as a case study that validates the effectiveness of the proposed design method; 2
Summary
2aAerostatic presents the configuration of an aerostatic spindle that is employed in an. 3. The Configuration of an Spindle ultra-precision fly cutting machine tool. Two air thrust bearings and a radial bearing are adopted to separate ultra-precision fly cutting machine tool. Two air thrust bearings and a radial bearing are adopted to separate the rotating machining, the axial direction of the spindle is the error-sensitive direction. In ultra-precision fly cutting mathe axial vibration and tilt vibration of the rotating parts has a significant impact on the chining, the axial direction of the spindle is the error-sensitive direction. Chined surface quality [22] It indicates that enhancing its axial stiffness and angular stiffFigure 2b demonstrates the geometrical parameters of the aerostatic thrust bearing. There are n orifices distributes along the circumferential direction of the thrust thickness of air film, respectively.
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