Performance of High-Speed Precision Air-Bearing Spindle with Active Aerodynamic Bearing
Hiroshi Mizumoto*, Yoichi Tazoe**, Tomohiro Hirose**, and Katsuhiko Atoji**
4-101 Koyama-Minami, Tottori, Tottori 680-8550, Japan
1-1-1 Fujikoshi-Honmachi, Toyama 930-8511, Japan
A high-speed precision air-bearing tool spindle with active aerodynamic bearing is proposed for improving the quality of machining using small-diameter cutting and grinding tools. The spindle is basically supported by aerostatic radial and thrust bearings. According to the spindle vibration detected by capacitance sensors, the wedge angle of the active aerodynamic bearing was controlled using piezoelectric actuators, thereby suppressing the spindle vibration. In the present paper, the performances of a prototype air-bearing spindle with single-row active aerodynamic bearing and an improved air-bearing spindle with double-row bearings are reported. Through experiments, it was demonstrated that the maximum rotational speed controlled by the active aerodynamic bearing is 800 Hz (48,000 min-1), and that the amplitude of spindle vibration can be suppressed to <50 nm at the rotational speed of 500 Hz (30,000 min-1).
-  T. Miyaguchi, M. Masuda, E. Takeoka, and H. Iwabe, “Effect of tool stiffness upon tool wear in high spindle speed milling using small ball end mill,” Precision Engineering, Vol.25, No.2, pp. 145-154, 2001.
-  T. Matsumura and Y. Ueki, “Milling of micro grooves on glass cylinder surface,” Int. J. of Automation Technology, Vol.5, No.1, pp. 11-20, 2011.
-  M. Yabuya, “The future of ultraprecision machine tool and its element technology,” Journal of JSPE, Vol.75, No.1, pp. 209-215, 2009 (in Japanese).
-  T. Hirose, Y. Kami, T. Shimizu, M. Yabuya, and Y. Morimoto, “Development of ultra-precision 5-Axis machine tool for optical mold,” Journal of JSPE, Vol.80, No.2, pp. 177-182, 2014 (in Japanese).
-  E. R. Marsh, “Precision spindle tetrology,” DEStech Publications Inc., 2nd edition, pp. 3-9, 2010.
-  H. Mizumoto, S. Arii, and M. Yabuya, “Rotational accuracy and positioning resolution of an air-bearing spindle with active inherent restrictor,” Proceedings of 10th International Conference on Production Engineering, Vol.1, pp. 709-713, 2001.
-  O. Horikawa and A. Shimokohbe, “An active air jornal bearing,” JSME Int. Journal, Ser., 111, Vol.33, No.1, pp. 55-60, 1990.
-  O. Horikawa, K. Sato, and A. Shimokohbe, “An active air jornal bearing,” Journal of JSPE, Vol.58, No.6, pp. 1047-1052, 1992 (in Japanese).
-  S. Hara, “The development of ultraprecision rotate spindle,” Nachi Technical Report, Vol.50, No.2, pp. 50-56, 1992 (in Japanese).
-  H. Mizumoto, Y. Tanaka, Y. Yabuta, S. Arii, Y. Tazoe, and S. Yokouchi, “A high-speed air spindle employing activea aerodynamic bearing system,” Proceedings of 10th Anniversary International Conference of the euspen, Vol.1, pp. 394-397, 2008.
-  H. Mizumoto, Y. Yabuta, S. Arii, Y. Tazoe, and S. Yokouchi, “An active aerodynamic bearing for ultraprecision machining,” Proceedings of 9th International Conference of the euspen, Vol.1, pp. 256-259, 2009.
-  H. Mizumoto, Y. Yabuta, S. Arii, Y. Tazoe, and S. Yokouchi, “An active aerodynamic bearing for ultraprecision machining,” Proceedings of 1st International Conference of the euspen, Vol.1, pp. 300-303, 2010.
-  A. Z. Szert, “Tribology,” McGraw Hill Book Company, 1st edition, pp. 122-131, 1980.
-  J. Halling, “Principles of tribology,” Macmillan Education, Reprinted, pp. 235-242, 1987.