Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1986-02-13
1987-09-22
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, 175414, 51293, 51309, E21B 1052
Patent
active
046949186
ABSTRACT:
A percussion rock bit comprises a steel body having means for connection to a drill string at one end and having a plurality of inserts at the other end for crushing rock at the bottom of a hole being drilled. The inserts have a cemented tungsten carbide body partially embedded in the steel bit and at least two layers at the protruding drilling portion of the insert. The outermost layer contains polycrystalline diamond. The remaining layers adjacent the polycrystalline diamond layer are transition layers containing a composite of diamond crystals and precemented tungsten carbide, the composite having a higher diamond crystal content adjacent the polycrystalline diamond layer and a higher precemented tungsten carbide content adjacent the tungsten carbide layer.
Another embodiment of rock bit has three cones with tungsten carbide inserts in the cutting structure of each cone. The gage row inserts have a layer of polycrystalline diamond on the converging portion protruding from the surface of the cone. One or more transition layers are provided between the tungsten carbide insert body and the polycrystalline diamond layer. Such a transition layer comprises diamond and precemented tungsten carbide.
REFERENCES:
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patent: 3941197 (1976-03-01), Stinson
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4140189 (1979-02-01), Garner
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patent: 4333540 (1982-06-01), Daniels
patent: 4481016 (1984-11-01), Campbell et al.
patent: 4525178 (1985-06-01), Hall
patent: 4604106 (1986-08-01), Hall et al.
Megadiamond Announcement, dated Oct. 6, 1981.
Melius Terry Lee
Novosad Stephen J.
Smith International Inc.
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