Elements faced with superhard material

Details Elements faced with superhard material Elements faced with superhard material

1994-11-09

1997-02-04

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Drill

76DIG6, 76DIG12, 175428, E21B 1046, E21B 1056

Patent

active

055987508

ABSTRACT:
A preform element, such as a cutting element for a drag-type drill bit, includes a facing table of superhard material having a front cutting face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material. The rear surface of the facing table is integrally formed with a plurality of protuberances, such as ribs or studs, which project into the substrate. The depth to which the protuberances project into the substrate varies in irregular manner across the facing table, so as to inhibit the propagation of cracks across the substrate to the rear of the facing table.

REFERENCES:
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4629373 (1986-12-01), Hall
patent: 4784023 (1988-11-01), Dennis
patent: 5011515 (1991-04-01), Frushour
patent: 5120327 (1992-06-01), Dennis
patent: 5351772 (1994-10-01), Smith

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