DRILL TOOL FOR METAL-WORKING MACHINES AND METHOD OF ITS FABRICATION Russian patent published in 2012 - IPC B23B51/02 B23P15/32 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in making drilling tool and its operation with metal-working machines. Proposed tool comprises drill body, cutting head arranged on end face of drill body, and shank arranged on its end. Drill body has two chip removal flutes defined by ribs made on its sides. First said flute is bent in helical fashion. Second flute is not bent or bent in helical fashion with lead angle different from that of the first flute directed, preferably, in the same rotational direction. Invention covers also versions of methods of fabricating drilling tools.

EFFECT: improved operating properties.

32 cl, 7 dwg