The Effect on Cutting Tool Forces of Pre-Weakening a Rock Surface by Waterjet Kerfing

[+] Author and Article Information
J. E. Geier, M. Hood

Department of Materials Science and Mineral Engineering, University of California, Berkeley

J. Eng. Ind 111(1), 1-6 (Feb 01, 1989) (6 pages) doi:10.1115/1.3188727 History: Received September 01, 1987; Online July 30, 2009


Empirical models are developed to describe the influence on the cutting process of preweakening a rock, by cutting a series of parallel kerfs in the surface with high pressure waterjets, prior to excavating the rock with a polycrystalline diamond compact (PDC) drag bit. These models show that both the bit cutting force and the bit normal force are reduced substantially (by as much as a factor of four) when the spacing and the depth of the kerfs is appropriate to the depth of cut taken by the bit. The mechanical specific energy, or the mechanical energy applied to the bit to excavate a unit volume of rock, is also reduced dramatically when the rock is prekerfed.

Copyright © 1989 by ASME
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