Cutting elements for rotary drill bits

Details Cutting elements for rotary drill bits Cutting elements for rotary drill bits

1990-05-14

1991-10-29

Dixon, Jr., William R.

Abrasive tool making process, material, or composition

Miscellaneous

51295, B24D 300

Patent

active

050612930

ABSTRACT:
A preform cutting element for a rotary drill bit includes a layer of polycrystalline diamond material, the rear face of which is bonded to the front face of a backing layer of less hard material, such as tungsten carbide. The rear face of the backing layer is substantially greater in area than the rear face of the diamond layer. A method of manufacturing such cutting elements comprises forming an intermediate structure comprising polycrystalline diamond material bonded between two outer layers of tungsten carbide, and then cutting the intermediate structure to provide two pieces, each of the pieces including part of the diamond material and at least a major part of a respective one of the two outer layers.

REFERENCES:
patent: 4219339 (1980-08-01), Wilson
patent: 4225322 (1980-09-01), Knemeyer
patent: 4255165 (1981-03-01), Dennis et al.
patent: 4259090 (1981-03-01), Bovenkerk
patent: 4539018 (1985-09-01), Whanger et al.
patent: 4694918 (1987-09-01), Hall
patent: 4995887 (1991-02-01), Barr et al.

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