Patent ID: 8834077
Filing Date: 2014-09-16
Classification: B22F,B23B,B23P,C22C,Y10T

Abstract:
1. A method of fabricating a drill, which includes a drill part for machining a hole and a shank part, the drill part and the shank part being made of different materials, the method comprising: forming a drill part-forming powder compact having a recess in one end thereof, and forming a shank part-forming powder compact having a protrusion, the protrusion intended to be fitted into the recess of the drill part-forming powder compact; forming an assembly of the drill part-forming powder compact and the shank part-forming powder compact, with the protrusion fitted into the recess; and simultaneously sintering the assembly of the drill part-forming powder compact and the shank part-forming powder compact, wherein a size of an inner diameter of the recess formed in the drill part-forming powder compact and a size of an outer diameter of the protrusion formed in the shank part-forming powder compact are determined such that the inner diameter of the recess becomes smaller than the outer diameter of the protrusion after the powder compacts are sintered.