Drilling tool for machine tools and method for the production thereof

A method for the production of a drilling tool, onto the body of a drill of which is formed at least one chip conveyor groove and at least one functional channel, whereby a tubular blank, in a cold state, is loaded on its wall simultaneously by several forming segments distributed over a periphery and moving axially along a blank surface with radially oscillating shaping forming forces, thereby forming two oppositely lying chip conveyor grooves and at least one of a functional channel and a joint provided inside of the body of the drill, whereby the chip conveyor grooves are formed into the wall of the tubular blank by at least two of the forming segments, which are spaced from one another in peripheral direction, so that portions of the wall in the area of the two oppositely lying chip conveyor grooves provide their inner wall surface sealingly against one another forming a joint, wherein the wall portions, which rest against one another in the area of the joint, are cold-welded or are soldered to one another during the forming process.

A drilling tool for machine tools comprising a body of a drill, a cutting head arranged on a front side on the body of the drill, and a rearward drill shank, whereby the body of the drill includes at least two chip conveyor grooves extending from the cutting head over a part of its length, and at least two functional channels extending from the cutting head to the drill shank and having a triangular cross section with two or three curved boundary sides, wherein the body of the drill is designed as a circularly worked form part, and the functional channels form a joint at their boundary surfaces, which face one another, the joint being closed off by welding or soldering bridges.

A drilling tool for machine tools comprising a body of a drill, a cutting head arranged on a front side on the body of the drill, and a rearward drill shank, whereby the body of the drill includes at least two chip conveyor grooves extending from the cutting head over a part of its length, and at least two functional channels extending from the cutting head to the drill shank and having a triangular cross section with two boundary sides that are curved outwardly concavely and a third boundary side that is curved convexly, wherein the body of the drill is designed as a circularly worked form part, and the functional channels form a joint at their boundary surfaces, which face one another, the joint being closed off by welding or soldering bridges.

A drilling tool for machine tools comprising a body of a drill, a cutting head arranged on a front side on the body of the drill, and a rearward drill shank, whereby the body of the drill includes at least two chip conveyor grooves formed into the body and extending from the cutting head over a part of its length, with an outer, outwardly convex boundary side, which is partially concentric with respect to the partial-cylindrical outer surface and at least two functional channels extending from the cutting head to the drill shank and having triangular cross sections with two inner boundary sides, which follow the outer boundary side, and are outwardly at least partially concave, and meet in an acute-angled triangular corner pointing toward the axis of the body of the drill, wherein the body of the drill is designed as a circularly worked form part, and the functional channels form a joint at their boundary surfaces, which face one another, the joint being closed off by welding or soldering bridges.