DRILL POINT FOR A SPIRAL DRILL AND PROCEDURE FOR THE MANUFACTURE OF A VIRUTA RECEIVING SLOT, IN THE AREA OF THE DRILL POINT FOR A SPIRAL DRILL.

摘要

Drill bit (3) for a spiral drill (2) which has, together with each other, by means of a transverse edge (6), a plurality of main cutting edges (4) which are followed by secondary edges (14), which extend along chip receiving slots (10) in the longitudinal direction (L) of the drill bit, being between a tangent (T) adjacent to the inner side (16) of the secondary edge (14) and oriented perpendicularly to the longitudinal direction (L ) of the drill and to the radial direction (R), a secondary angle of attack (ã) increasing in the longitudinal direction (L) of the drill is defined, characterized in that the main edges (4) extend straight in the direction of the transverse edge (6).