Drilling tool for machine tools and method for the production thereof

摘要

A drilling tool for machine tools has a drill body and a cutting head arranged on the front face of the drill body. The drill body has at least two chip flutes, which are delimited at their flanks by ribs and at least one of which is spirally curved. Arranged in the ribs of the drill body are coolant channels, which have an outlet opening at the end of the drill body on the cutting head side. A special feature is that the outlet openings are arranged within each one of the chip flutes and communicate with one of the coolant channels arranged in the ribs by way of a straight channel endpiece.

主权项

1. 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.