Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1985-06-14
1986-06-10
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
76108A, 419 8, 419 49, E21B 1008
Patent
active
045937761
ABSTRACT:
A cladding process is disclosed wherein hard carbide cutter inserts, as well as polycrystalline diamond composites, are metallurgically bonded into an exterior core of a rock bit cone or a drag bit body. The cladding is bonded onto the exterior surface of the core of the cone or the drag bit by a powder metallurgy process. A thin layer or coating of a suitable metal, preferably nickel, is provided on, for example, the carbide inserts, prior to mounting into the core. The coating prevents degradation of the carbide through loss of carbon into the core during the powder metallurgy process and accommodates mismatch of thermal expansion between the cutter insert and the core.
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Powder Metallurgy Design Guidebook, by the Metal Powder Industries Federation, pp. 1-24.
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Ecer Gunes M.
Kuhn Karl O.
Salesky William J.
Neuder William P.
Novosad Stephen J.
Smith International Inc.
Szekeres Gabor L.
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