期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 78, 期 5-8, 页码 997-1004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
- National Science Foundation of China [51075133, 51375156]
- Scholarship Award for Excellent Doctoral Student - Ministry of Education of China
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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