Diamond drag bit cutting elements
AssigneeSmith International, Inc.
InventorsMichael C. Lockwood, Richard H. Dixon, Christopher A. Reed, Ronald B. Crockett, Kenneth W. Jones
Life of this patent
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Abstract
A unitized polycrystalline composite diamond stud type drag bit cutter having no high temperature braze of a PDC wafer to a carbide stud is disclosed. The diamond cutting surface may be planar, convex, curved or a truncated cone. The unitized construction of the cutter eliminates the problems associated with the high temperature brazing of a PDC wafer to a carbide stud.
Claims9
An insert stud cutter comprising;
- a tungsten carbide cylindrical body, said body forming a first cylindrical base end, said second cutter end having at least one ultra hard layer directly bonded to a pre-formed surface by said second cutter end, said ultra hard layer may comprise one or more layers of tape cast material.
The invention as set forth in claim wherein hard layer may comprise injection molded material.
A diamond insert stud cutter for a rock bit comprising;
- a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one diamond layer directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
An insert stud cutter for rock bits comprising;
- a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one layer of Cubic Boron Nitride directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
Dependencies are inferred from the claim text.