A magnetically suspended miniature spindle and its application for tool orbit control
A magnetically suspended miniature spindle and its application for tool orbit control
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DOI：
10.1007/s12541-012-0210-4
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发表时间：
2012-09
影响因子：
1.9
通讯作者：
Jong-Kweon Park;J. Kyung;W. Shin;S. Ro
中科院分区：
文献类型：
--
作者：
Jong-Kweon Park;J. Kyung;W. Shin;S. Ro
本文报道了一种用于超高速微细加工的微型磁轴承主轴的设计、分析和实验结果。为了确保稳定的高速旋转，轴被设计成使得第一柔性固有频率高于9 kHz。带有永磁体偏置的四极径向磁轴承位于主轴的前面和后面，主轴盖处的轴向空气轴承用于在轴向方向上保持轴。此外，为了确保小工具被有效地夹紧，在轴的前端增加了具有形状记忆合金的夹紧机构。所设计的微型主轴外径为62 mm，包括外壳在内的总长度为94 mm。主轴由基于数字信号处理器（DSP）的控制系统控制，并使用内置空气涡轮机以高达200，000 rpm的转速旋转。评价了主轴的稳定性和控制刀具轨迹以生成微特征的能力。
This paper reports the design, analysis, and experimental results of a miniature spindle using magnetic bearings for very high-speed micromachining. To ensure stable high-speed rotation, the shaft was designed such that the first flexible natural frequency was higher than 9 kHz. Four-pole radial magnetic bearings with a permanent magnet bias were located in front of and behind the spindle, and axial air bearings at the spindle covers were used to hold the shaft in the axial direction. Additionally, to ensure small tools were clamped effectively, a clamping mechanism with a shape memory alloy was added at the nose of the shaft. The designed miniature spindle has an outer diameter of 62 mm and a total length of 94 mm, including the housing. The spindle was controlled with a digital signal processor (DSP)-based control system and rotated at up to 200,000 rpm using a built-in air turbine. The stability and ability of the spindle to control the tool orbit to generate micro-features was evaluated.