Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1999-02-04
2000-11-21
Pezzuto, Robert E.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175374, E21B 1008, E21B 1062
Patent
active
061489360
ABSTRACT:
A rotary drill bit is manufactured by a powder metallurgy process by placing a metal mandrel in a mold, packing the mold with particulate matrix-forming material, infiltrating the material with a molten binding alloy, and cooling the assembly to form a solid infiltrated matrix bonded to the mandrel. The mandrel comprises an outer part surrounded by the matrix-forming material and an inner part, secured to the outer part but out of contact with the matrix-forming material. The outer part of the mandrel is formed from a material having thermal characteristics close to those of the matrix, so as to reduce the tendency for the matrix to crack under thermal stress, while the inner part of the mandrel is formed from a precipitation-hardening material, the strength and hardness of which increases in the infiltration process and the subsequent heating/cooling cycle for brazing the cutters on to the drill bit. The threaded shank of the drill bit is formed directly on the inner part since it will have sufficient strength and hardness for this purpose.
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Bell Andrew
Evans Stephen Martin
Camco International (UK) Limited
Daly Jeffery E.
Pezzuto Robert E.
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