Development of a High-Performance Spindle for Multitasking Machine Tools
Taku Yamazaki1, Toshiyuki Muraki2, Atsushi Matsubara2,
Mitsuho Aoki3, Kenji Iwawaki4, and Kazuyuki Kawashima4
1Development and Design Department, Yamazaki Mazak Corporation, Oguchi-cho, Aichi 480-0197, Japan
2Department of Micro Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-0024, Japan
3Precision Bearing Technology Department, NSK Corporation, 1-5-50, Kugenuma Shinmei, Fujisawa-shi, Kanagawa 251-8501, Japan
4Servo Motor Manufacturing Department, Mitsubishi Electric Corporation, 1-14, Yada-minami 5-chome, Higashi-ku, Nagoya-shi, Aichi 461-8670, Japan
In recent years, high-performance spindles are required for multi-tasking machine tools to enhance the productivity. Such spindles enable efficient rough cutting and fine finishing of a workpiece on one machine. In order to meet this requirement, a spindle unit must be highly stiff and operate at high rotational. Spindle specifications require a rotational number of 50,000min-1 and dN value of 3,000,000, a smaller motor was downsized and an electric loss restrained by reducing the thickness of laminate sheets composing the rotor core. A direct-injection type of ultra trace quantity lubrication and a preload switching system were used for ball bearings for high rotational speed and high stiffness. We discuss how these technical requirements were met and the results of basic experiments.
Mitsuho Aoki, Kenji Iwawaki, and Kazuyuki Kawashima, “Development of a High-Performance Spindle for Multitasking Machine Tools,” Int. J. Automation Technol., Vol.3, No.4, pp. 378-384, 2009.
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