4.6 Article

Design and evaluation of a high-speed and precision microspindle

期刊

出版社

SPRINGER LONDON LTD
DOI: 10.1007/s00170-014-6690-x

关键词

Microspindle; Air turbine; Coupling; Clamp; Shape memory alloy

资金

  1. National Science Foundation of China [51075133, 51375156]
  2. Scholarship Award for Excellent Doctoral Student - Ministry of Education of China

向作者/读者索取更多资源

This study presents the design and evaluation of a high-speed and precision microspindle used for micromechanical machining. A radial impulse turbine with two rows of nozzles was designed to realize the high-speed performance. A monolithic flexible coupling was used to decouple the turbine shaft and the tool, and then, the tool shank was directly supported by aerostatic bearings, which can minimize the run-out of the tool at high speeds. Additionally, a shape memory alloy (SMA)-based clamp was designed for tool clamping. It can avoid the assembly error caused by stack-up tolerances. The microspindle has simple configuration and compact design with a 30-mm outer diameter and a 95-mm length. The prototype microspindle has a maximum speed of over 240,000 rpm and a tool radial run-out of 2.79 mu m. The evaluation results show the feasibility and potential application of the new design concept of the microspindle proposed in this study.

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