Segmented Core Drill Bit With Vacuum Brazed Outside

A drill bit, drill bit allocation in front with a plurality of cutting edge part, and a base end side of the cutting edge part and on the base end part is formed on the shank axis shaped drill body; The cutting edge part is composed of a cutting edge cutting surfaces and clearance face edge forward end side projection equipment and the formation of the cutting edge, since the center of rotation of the outer diameter side drill lateral configured to substantially radial; Compound action utilizes rotary motion and axial direction of the action of impact cutting, which is characterized in that, between the cutting edge part is provided with at least 2 main cutting edge part, and is arranged on the circumferential direction of the cutting edge part and the cutting edge part, at least 2 side cutting edge part; The cutting edge part is provided with a main cutting edge as its cutting edge, the cutting edge is located in the center of rotation of the outer edge of the inner end of the rotation trajectory, the outer end is positioned on the cutting edge part, the side cutting edge portion has a side cutting edge as its cutting edge, the side cutting edge inner end located from the center of rotation of the outer diameter side part of the outer end of deviation, in from the outer edge of the rotation trajectory cutting edge portion of the rotating center deviation of the position of the side.