Rock bit insert

Details Rock bit insert Rock bit insert

1988-08-31

1989-09-26

Neuder, William P.

Boring or penetrating the earth

Processes

76108A, 175410, E21B 1052

Patent

active

048693294

ABSTRACT:
A new and improved tungsten carbide insert for rock bits is disclosed, in which the inserts are subject to extended vibratory tumbling in order to increase their fracture toughness. More specifically the vibratory finishing or tumbling of the inserts has been increased from a typical time of 30-60 minutes to time periods of at least 90 minutes and preferably a minimum of 225 minutes. A marked improvement in toughness is obtained by this process because the size and distribution of surface flaws of the inserts were greatly reduced, and because the surface hardness of the inserts was increased, thereby resulting in an increase in the stress required to cause fracture, and a consequent increase in resistance to breakage.

REFERENCES:
patent: 2687875 (1954-08-01), Morlan et al.
patent: 2731710 (1956-01-01), Lucas et al.
patent: 3581835 (1971-06-01), Stebley
patent: 4211508 (1980-07-01), Dill et al.
patent: 4674365 (1987-06-01), Reed
Cutter, et al.; Correlation of the Mechanical Properties of WC-Co. with Drilling Performance in Hard Formations, Jul. 1982, pp. 77-79.

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