초록 ▼

A rotary drill bit is provided for boring earth formations which includes a bit blank and a metal matrix secured to the blank. The metal matrix includes a filler material dispersed therein. Cutting elements are mounted on the exterior face of the bit, and substantially all of the exposed internal an

A rotary drill bit is provided for boring earth formations which includes a bit blank and a metal matrix secured to the blank. The metal matrix includes a filler material dispersed therein. Cutting elements are mounted on the exterior face of the bit, and substantially all of the exposed internal and external surfaces of the bit are coated with an erosion and abrasion resistant hardfacing material bonded to the metal matrix.

대표청구항 ▼

A process for the production of a rotary drill bit matrix coated with a hardfacing layer comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) providing one or more displacement elements corresponding to features to be formed on and within the bit; (

A process for the production of a rotary drill bit matrix coated with a hardfacing layer comprising the steps of: (a) forming a hollow mold for molding at least a portion of the drill bit; (b) providing one or more displacement elements corresponding to features to be formed on and within the bit; (c) applying adhesive and hardfacing material to the interior surfaces of said mold and the exterior surfaces of said displacement elements, said adhesive being effective to hold said hardfacing material in place; (d) positioning a bit blank at least partially within said mold; (e) packing said mold with a filler material; (f) infiltrating said filler material and said hardfacing material on said mold and displacement element with a binder in a furnace to form said bit; and (g) removing said displacement elements to form said features having a coating of said hardfacing material on the surfaces thereof.