Crowned surface with PDC layer

Details Crowned surface with PDC layer Crowned surface with PDC layer

1996-01-26

1997-07-15

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175426, 761082, E21B 1056

Patent

active

056474490

ABSTRACT:
The present disclosure is directed to a crowned insert. The insert is elongate, right cylinder, two ended body of carbide, preferably bonded tungsten carbide particles. The near end is sized to fit in a hole in a drill bit while the remote end is provided with an enlargement. The enlargement in one embodiment is provided with a circular profile, and has an edge which is chamfered with a radius of curvature to avoid sharp edges. The end of the insert is crowned with a PDC layer integrally cast and bonded thereto so that the enlargement is fully surrounded by the PDC crown.

REFERENCES:
patent: 4109737 (1978-08-01), Bovenkerk
patent: 5011515 (1991-04-01), Frushour
patent: 5379854 (1995-01-01), Dennis
patent: 5486137 (1996-01-01), Flood et al.
patent: 5499688 (1996-03-01), Dennis
patent: 5566779 (1996-10-01), Dennis

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