Hard metal head for a tool for processing solid material

摘要

The hard metal head (101) has diametric opposite prolonged side surfaces (104) and short side surfaces (103) an assembly side which points the forehead end of a shaft of drilling tools, and a face surface along a main cutting edge (110). A recess (120) or projection provided in the side surface and face surface as wear mark has an axial portion (131) extended along short side surface in axial direction, and a front end portion (121) extended along face surface in parallel to the main cutting edge.