Dynamic characteristics of an aerostatic bearing spindle and its influence on surface topography in ultra-precision diamond turning
Dynamic characteristics of an aerostatic bearing spindle and its influence on surface topography in ultra-precision diamond turning
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DOI：
10.1016/j.ijmachtools.2012.04.007
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发表时间：
2012-11
影响因子：
14
通讯作者：
S. Zhang;S. To;C. Cheung;H. Wang
中科院分区：
文献类型：
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作者：
S. Zhang;S. To;C. Cheung;H. Wang
在超精密金刚石车削（UPDT）中，空气静压轴承主轴振动是影响表面形貌的主要因素。本文建立了空气静压轴承主轴的五自由度动力学模型，描述了其平移运动和倾斜运动的动力学响应，并分析了UPDT中不同切削工艺对主轴振动表面形貌的影响。结果表明：主轴沿轴向的固有频率、沿径向的径向固有频率和沿径向的双倾斜固有频率，当切削由外向中心发展时，主轴倾斜运动对表面形貌的主导作用逐渐消失，轴向平移运动对表面形貌的影响较大。实验结果证实了这一点。
In ultra-precision diamond turning (UPDT), aerostatic bearing spindle vibration plays the major part in many factors that influence surface topographies. In this paper, a five-degree-of-freedom dynamic model for an aerostatic bearing spindle is built up to describe its dynamic responses, involving translational motions and tilting motions, and to analyze the effects on surface topography of the spindle vibration under different cutting processes in UPDT. It was found that the spindle processes at the axial natural frequency along the axial direction, the radial natural frequency along the radial directions and the twin tilting natural frequencies around the radial directions, and when cutting develops from outside to the center of the machined surface, the dominant effects of the spindle's tilting motions on surface topography gradually disappear and the axial translational motion produces a great influence on surface topography. This was identified by the experimental results.