Patent ID: 8753046

Claim:
A method of producing a drilling tool having a drill body with an end cutting head and an end shank, comprising the steps of: providing a base material body; forming the base material body into a rotationally symmetrical blank having a shank end and a cutting head end; providing at least two deep-hole bores into the blank which are arranged at a distance from each other and extend in a direction of the shank end of the blank from points which are arranged eccentrically with respect to a central axis on an end face of the cutting-head blank end; clamping the blank at clamping-in points which are at an axial distance from one another; heating the clamped blank to a predetermining temperature at a zone of the blank provided between the clamping-in points; and twisting the clamped blank plastically through a predetermined angle to form a helically-shaped blank, wherein a number of chip flutes, corresponding to the number of deep-hole bores, are milled in a helical shape in the helically-shaped blank such that twisted deep-hole bores run within ribs which remain between adjacent flanks of the chip flutes and the deep-hole bores are milled on the cutting head side in an untwisted straight area forming outlet openings which open into the chip flutes.