Drill bit with high performance for chip removal
A drill bit with high performance for chip removal. The drill bit comprises a cutting tip and a drill body. The cutting tip comprises a chisel edge, a back edge, a cutting edge groove and a rear rib. The cutting edge groove is a circular groove having meniscus shape. A primary cutting surface interposed between the cutting edge groove and the back edge has a trapezoidal or triangular shape. Grinding the rear rib forms a quadratic rear plane. The quadratic rear plane crossing with the chisel edge and the cutting edge groove defines a cutting edge groove plane. The drill bit has three tips and seven cutting edges. A drill bit according to the present invention provides a significant improvement in cutting performance over known twist drill bit in the prior art.
1. A drill bit with high performance for chip removal, consisting of:
a drill tip and a drill body, said drill tip including a drill core, a back edge, a tooth, and a back groove edge;
a main cutting edge face between said tooth and said back edge, said back groove edge is processed into a plane secondary back face, said secondary back face intersects said tooth and said drill core into a tooth plane, said secondary back face intersects said tooth plane; and
two side tips, wherein said two side tips are located proximate an outer edge of said drill tip and defined by surfaces of said tooth and said main cutting edge face, wherein a surface of the tooth originates at said drill core and runs proximate a longitudinal axis of said drill tip and terminates proximate said main cutting edge face, wherein said surface of the tooth is concave;
wherein the drill tip consists of two of said tooth having concave surfaces;
wherein the drill tip consists of no more than three tips;
wherein, where the main cutting edge face touches the outer edge of the drill tip, only the surface of the main cutting edge face and the surface of the tooth connect the outer edge of the drill tip with the drill core.
2. A drill bit with high performance for chip removal according to claim 1 , wherein the angle between the said secondary back face and said tooth plane is 60-120 degrees.