Ceramics drill for high speed drilling and drilling process

摘要

The drill has a cut part (3) extending axially from a shank (2). The cut part has a free end in which the drill head is formed. A flange (21) extends from a main cutting edge (18) having a relief angle between 4 and 10 degrees with respect to a plane perpendicular to a drill axis. Two pitting (27) form secondary cutting faces extending from a central edge (19), where the drill has a positive cutting angle. - An INDEPENDENT CLAIM is also included for a method of drilling with a ceramic drill.