FIELD: process engineering.
SUBSTANCE: drill tip has, at least, one inner cutting edge and one outer cutting edge that make the sides of angular cutting edge interacting with workpiece in drilling. To reduce drill bit pressing-out, angle vertex has centering point made in the formed of knobby bulge while each lateral side of said bulge forms convex cutting edge that changes into inner cutting edge and outer cutting edge, respectively.
EFFECT: higher efficiency of cutting.
10 cl, 5 dwg
