Rotary percussion drill bit with a hard material insert

摘要

Percussion drill comprises a hard material insert (2) with cutting edges (3) and a base surface (4) fixed with a hard solder (5) to an axial base surface (6) which is chamfered an the outer radial edge. Preferred Features: The axial thickness of the hard solder between the base surface and the axial base surface is less than 0.6 mm.