Cutting element with wear resistant crown

Details Cutting element with wear resistant crown Cutting element with wear resistant crown

1986-08-22

1987-11-10

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

51309, 76108A, 76DIG11, B21K 502, C04B 3556, E21B 1058

Patent

active

047051248

ABSTRACT:
A cutting element adapted to be used in a rotary drill bit is made by positioning in an appropriately shaped die cavity a quantity of a mixture of tungsten carbide and 4 to 11 percent cobalt in the shape of a crown for defining an outer surface for the tip portion of the cutting element using a pressure of less than about 600 pounds per square inch; positioning in the cavity a quantity of a mixture of tungsten carbide and 12 to 17 percent cobalt sufficient to form almost all of a base portion and at least an inner part of the tip portion for the cutting element; pressing the two quantities of the mixtures together and into the die at pressures in the range of about 10 to 15 tons per square inch; and sintering the pressed insert to form the cutting element.

REFERENCES:
patent: 2108797 (1938-02-01), Comstock
patent: 2842342 (1958-07-01), Haglund
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4168923 (1979-09-01), Vezirian
patent: 4211508 (1980-07-01), Dill et al.
patent: 4359335 (1982-11-01), Garner
patent: 4372404 (1983-02-01), Drake

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