Cutter elements for rotary drill bits

Details Cutter elements for rotary drill bits Cutter elements for rotary drill bits

1989-06-26

1991-01-29

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG12, 51293, 175329, 175410, B21K 502, E21B 1046

Patent

active

049878000

ABSTRACT:
A preform cutting element, for a rotary drill bit, includes a layer of polycrystalline diamond material having a front cutting face, a rear face and a peripheral surface, a cutting edge being provided by at least part of the junction between the front cutting face and the peripheral surface. The diamond layer is formed around its periphery, adjacent the cutting edge, with a row of spaced apertures. Each aperture is in the form of a bore, formed for example by a laser, which is inclined at 45.degree. to the cutting face and extends completely through the diamond layer from the cutting face to the peripheral surface thereof. The apertures serve to inhibit the propagation of spalling across the cutting face from the cutting edge.

REFERENCES:
patent: Re32036 (1985-11-01), Dennis
patent: 4702649 (1987-10-01), Komanduri
patent: 4792001 (1988-12-01), Zijsling

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