A Study of the Drilling Process

[+] Author and Article Information
R. A. Williams

Department of Industrial Engineering, University of New South Wales, Kensington, Australia

J. Eng. Ind 96(4), 1207-1215 (Nov 01, 1974) (9 pages) doi:10.1115/1.3438497 History: Received July 30, 1973; Online July 15, 2010


Drilling is a complex three dimensional cutting process yet it is possible to simulate the action of a two flute twist drill with two dimensional models provided consideration is given to the influence of the feed velocity on the cutting geometry at the drill point. Two models of chip formation and an indentation model are developed to simulate the action of the drill point. From these models equations are derived for the prediction of total torque and thrust given the cutting conditions, drill geometry, and an empirical factor which is related to the work material. Computed values of torque and thrust are shown to compare favorably with those obtained from drilling tests on an 0.45 percent C steel. The shape and magnitude of the wear zone about the chisel edge is estimated and it is shown that the observed finite thrust force as the feed rate approaches zero can be attributed to the “cutting” action of the chisel edge.

Copyright © 1974 by ASME
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