Patent ID: 8944727
Filing Date: 2015-02-03
Classification: B23B,B23P,Y10T

Abstract:
1. A drilling tool for machine tools having a drill body, a cutting head which is arranged thereon at an end, and a shank which is arranged thereon at an opposite end, wherein the drill body has two chip flutes, which are bounded on their flanks by ribs, of which a first chip flute is curved in a helical shape, and a second chip flute is curved in a helical shape with a pitch which differs from that of the first chip flute, wherein a first coolant channel is provided in a rib of the drill body, extends from the shank end to the cutting-head end of the drill body, and has an outlet opening at the cutting-head end, characterized in that a further coolant channel is formed in a further rib, extends from the shank end to the cutting-head end of the drill body and has an outlet opening at the cutting-head end, the first coolant channel is curved in a helical shape and the further coolant channel is curved in a helical shape with a different pitch from the first coolant channel.