Piercing cutter insert has curved swarf guide stage in swarf guide direction which is also curved in width direction

摘要

The piercing cutter insert has a curved swarf guide stage (11) in the swarf guide direction which is also curved in its width direction (22). The guide stage is formed as a swarf trough (12) with at least one spherical surface. The swarf trough has a front swarf entry area (13) with a positive swarf angle and a rear swarf exit area (14) with a negative swarf area. The swarf trough is part of the swarf surface (15), which has a bevel (17) extending between the trough and a cutter (16). The bevel in the swarf guide direction has a convexly curved transition edge (18).