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.
Life Models for Small-Diameter Polycrystalline Diamond Compact Bits in Hard Abrasive Media
Hough, C. L., Jr., Das, B., and Rozgonyi, T. G. (December 1, 1986). "Life Models for Small-Diameter Polycrystalline Diamond Compact Bits in Hard Abrasive Media." ASME. J. Energy Resour. Technol. December 1986; 108(4): 310–314. https://doi.org/10.1115/1.3231282
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