Abstract
An abrasion resistance, heat damage resistance and hardness of cemented carbide are better than high hardened steels. Therefore cemented carbide is expected for die and mold. But cutting of cemented carbide is quite difficult by carbide tool. So we usualy cut cemented carbide by diamond tool. For instance, PCD tool is used for surface finishing. Although cutting edge of PCD square end mill is brittle. Therefore we developed high stiffness cutting edge of PCD square end mill. We obtain sharp coner and exellent surface by using developed PCD square end mill, and achieve longer tool life with arc shaped cutting edges.
