Diamond insert

Details Diamond insert Diamond insert

1989-12-18

1990-11-27

Schmidt, Frederick R.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, 407118, E21B 1046

Patent

active

049729128

ABSTRACT:
A diamond cutter consisting of a polycrystalline diamond layer sintered to a cylindrically shaped tungsten carbide substrate is brazed to a cylindrically shaped mounting surface formed at a cutting end of a tungsten carbide insert body. The cylindrically shaped mounting surface of the insert body is the same diameter as the tungsten carbide substrate hence no fillet of braze material can form adjacent the juncture between the substrate and the insert body at the cutting end of the insert thereby minimizing the damaging affect of a leaching process that forms microvoids or cracks in the insert body.

REFERENCES:
patent: 4437800 (1984-03-01), Araki et al.
patent: 4605343 (1986-08-01), Hibbs et al.
patent: 4714385 (1987-12-01), Komanduri
patent: 4716975 (1988-01-01), Dennis

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