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Novel Diaphragm-Control Restrictor for Precision Hydrostatic-Bearing Spindle

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Abstract:

A novel diaphragm-control restrictor (DCR) is proposed for improving the performance of the hydrostatic-bearing spindle used in machine tools. The unique function of the proposed DCR is the wide adjustability of its restrictor characteristic. A two-step restriction system is adopted for the DCR; a spool restrictor is used as the first step restrictor. By changing the restrictor resistance of the spool restrictor, the effect of the active control in the DCR, the second step restrictor, can be altered. The proposed DCR is incorporated into a hydrostatic bearing supporting a precision spindle, and the performance of the bearing is analyzed. Numerical and experimental analyses show that the stiffness of the hydrostatic bearing with the proposed DCR can be five times as large as a conventional hydrostatic bearing of the same dimensions. Analysis of the dynamic compliance shows that the effect of the active control can be observed up to 20Hz. These results show that the proposed DCR is useful for improving the performance of the hydrostatic-bearing spindle in precision applications.

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Info:

Periodical:

Key Engineering Materials (Volume 516)

Pages:

463-468

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.516.463

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Online since:

June 2012

Authors:

Hiroshi Mizumoto, Taiki Sunahara, Yoshito Yabuta, Shiro Arii, S. Fujii, K. Matsumoto, K. Murakami

Keywords:

Active Restrictor, Cylindrical Grinder, Diaphragm-Control Restrictor, Grinding Machine, Hydrostatic Bearing, Machine Tool

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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References

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