Whirling Vibration in Drilling. Part 3: Vibration Analysis in Drilling Workpiece with a Pilot Hole

[+] Author and Article Information
S. Ema

Department of Technology Education, Gifu University, 1-1 Yanagido, Gifu-shi 501-11, Japan

H. Fujii, E. Marui

Department of Mechanical Engineering, Gifu University

J. Eng. Ind 110(4), 315-321 (Nov 01, 1988) (7 pages) doi:10.1115/1.3187888 History: Received September 01, 1986; Online July 30, 2009


The whirling vibration of the drill when beginning the drilling of a workpiece with a pilot hole, is theoretically examined. It becomes clear that the whirling is a regenerative chatter vibration which is caused by the regenerative effect at the major cutting edge and the frictional force occurring due to the interference between the flank surface of the major cutting edge and the workpiece surface. As the amplitude and the vibration speed of the drill are restricted by the characteristic of the frictional force, distinctive vibration wave forms are observed. It is also found that the frequency of the whirling vibration which is decreased by the frictional force, is considerably lower than the natural frequency of the system, and that the odd number polygon is produced by the regenerative effect.

Copyright © 1988 by ASME
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