Conical stepped counter bore drill and production process thereof

The invention belongs to the technical field of cutting tools, and particularly relates to a conical stepped counter bore drill and a production process thereof.The conical stepped counter bore drill comprises a columnar part, the lower end of the columnar part is conical, axial grooves are symmetrically distributed in the two sides of the columnar part, and cutting edges A are arranged at notches of the axial grooves; a drill shank part; a spiral chip groove A; a spiral chip groove B; the scale marks are arranged at the bottom of one spiral chip removal groove A in the length direction of the spiral chip removal grooves A; the number of steps of the conical part is eight, and the spiral chip grooves A and the spiral chip grooves B are distributed in the circumferential direction at equal intervals. Compared with a traditional two-edge tool, the drilling tool has the beneficial effects that the drilling tool is more stable in the aspect of drilling machining, high in cutting efficiency and more excellent in h