Controllable preload spindle with a piezoelectric actuator for machine tools. (April 2019)

• Record Type: Journal Article
• Authors: Ciou, Yong-Shang; Lee, Chun-Ying
• Is Part Of: International journal of machine tools & manufacture. Volume 139(2019)
• Page Start: 60
• Page End: 63
• Publication Date: 2019-04
• Subjects: Spindle -- Ball bearing -- Preload -- Piezoelectric actuator; Machine-tools -- Periodicals; Manufacturing processes -- Periodicals; Machines-outils -- Périodiques; Fabrication -- Périodiques; Electronic journals; 621.902
• DOI: 10.1016/j.ijmachtools.2019.01.004
• Languages: English
• ISSNs: 0890-6955

Abstract

Abstract: The increased demand for high-speed, high-precision, stable, and long-life machine tools has made high-precision spindles an important topic of research. The key component of the machine tool spindle that supports the shaft is the ball bearing, whose characteristics are closely related to the spindle preload. In this study, a spindle preload control mechanism is designed using a piezoelectric actuator and a beveled spacer ring. Mechanical effects of the spindle preload are analyzed and controlled, and an experimental full-sized model is fabricated and tested. Results show that increased preload reduces vibration amplitude and raises the bearing temperature. All the measured mechanical effects are positively correlated with the controlled spindle preload. Highlights: Single piezoelectric actuator was used in an adjustable machine tool spindle. Adjustable stiffness was measured and calculated from load-displacement curve. Spindle's performances at different control voltages were demonstrated.