Differentially hardfaced rock bit

Details Differentially hardfaced rock bit Differentially hardfaced rock bit

1987-07-13

1988-02-23

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

295274, 76108A, E21B 1050

Patent

active

047264322

ABSTRACT:
A method for manufacturing an earth boring drill bit and bit produced thereby are shown. The bit has rotatable cutters with a plurality of milled teeth, each of the teeth having opposing flanks. A first tube hardfacing is applied to a selected one of the opposing flanks, the hardfacing comprising a metallic binder with wear-resistant particles dispersed throughout the binder. The other of the opposing flanks has a second tube hardfacing applied thereto. The particle size of the wear-resistant particles differs between the first and second tube hardfacings so that the resulting difference in abrasion resistance of the tooth flanks produces a self-sharpening effect as the tooth wears.

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patent: 4274769 (1981-06-01), Multakh
patent: 4533004 (1985-08-01), Ecer

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