Long-life milled tooth cutting structure

Details Long-life milled tooth cutting structure Long-life milled tooth cutting structure

E - Fixed Constructions

21

B

76/21, 255/74

E21B 10/16 (2006.01) E21B 10/52 (2006.01)

Patent

CA 1132972

LONG-LIFE MILLED TOOTH CUTTING STRUCTURE Abstract of the Disclosure One or more holes are drilled into the crest of the tooth-shaped cutting structure of a milled steel tooth rotary rock bit. Tungsten carbide rods are positioned in the holes and hardfacing is applied to the tooth. The hardfacing is applied across the top of the tooth crest and acts to hold the tungsten carbide rods in place. The rods are inserted in holes parallel and close to one flank of the tooth so that the entire length of the carbide rods can be attached to the hardfacing by burning the hardfacing through to the carbide rods. Wear on the tooth will proceed along the side of the tooth not reinforced with the carbide rods and a self-sharpen- ing effect is enhanced by the strength of the carbide rods. The carbide rods and holes therefore can be relatively inexpensive, since close tolerance finishing is not required.

356713

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