Bohrerspitze für einen Spiralbohrer und Verfahren zum Herstellen einer Spannut im Bereich einer Bohrerspitze für einen Spiralbohrer

摘要

The bit (3) for a twist drill (2) has several main cutting edges (4) which are interconnected by a chisel edge (6). Secondary cutting edges (14) running along flutes (10) in the longitudinal direction (L) of the drill adjoin said main cutting edges. The secondary effective cutting angle gamma associated with the secondary cutting edges (14) changes in the longitudinal direction of the drill (L). The main cutting edges (4) are preferably configured in a straight line so that the secondary effective cutting angle in this area is 0 DEG . The adjoining secondary effective cutting angle gamma increases continuously. This enables the bit (3) to absorb greater loads in the area of the main cutting edges (4) and at the same time, guarantees that the chips are removed rapidly from the bore wall of the workpiece to be processed.