Patent ID: 6371225
Filing Date: 2002-04-16
Classification: B22F,B24B,C23C,E21B

Abstract:
A drill bit, comprising:a body; a plurality of blind holes formed in the body; an insert mounted in each of the blind holes, the insert having a cylindrical barrel, a base end on one end of the barrel, and a cutting tip end opposite the base end, wherein an interference fit is provided between each of the barrels and the each of the blind holes; a bevel on the insert extending between the cylindrical barrel and the base end, defining an interface at an intersection between the bevel and the barrel, wherein the barrel, the cutting tip and the bevel are formed of a support metal of tungsten carbide; a ground and polished surface formed on the support metal of the barrel, the bevel, and the interface; and a hard metal coating formed on the ground and polished surface of the support metal of the cylindrical barrel, the bevel, and the interface.