Life Models for Small-Diameter Polycrystalline Diamond Compact Bits in Hard Abrasive Media

[+] Author and Article Information
C. L. Hough

Department of Mechanical Engineering, Texas A & M University, College Station, Tex. 77843

B. Das

Department of Industrial Engineering, Technical University of Nova Scotia, Halifax, Nova Scotia, Canada

T. G. Rozgonyi

Department of Mining Engineering, Texas A & M University, College Station, Tex. 77843

J. Energy Resour. Technol 108(4), 310-314 (Dec 01, 1986) (5 pages) doi:10.1115/1.3231282 History: Received June 04, 1985; Revised August 01, 1986; Online October 22, 2009


Mathematical models for bit life of polycrystalline diamond compact (PDC) drill bits were developed for drilling small holes in hard abrasive media. Based on the wear-out criterion of an average 0.060 in. (1.5 mm) flank wear land, bit life equations were formulated in three forms: bit life versus rotary speed and feed rate, bit life versus rotary speed and penetration rate, and wear rate versus cutting speed and cutter engagement area. The traditional linear-logarithmic model proved inadequate to describe bit life, whereas the quadratic-logarithmic model provided the best bit life prediction equation. Consequently, it would be possible to predict the optimum economical drilling conditions more accurately by employing a quadratic-logarithmic based bit life equation. The equation demonstrated the ability to predict the bit life precisely under different modes of wear.

Copyright © 1986 by ASME
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