Cutting insert for scarfing tools

摘要

The cutting insert comprises a prismatic plate-like body having substantially concave top and bottom surfaces connected by a plurality of substantially concave side surfaces extending between said top and bottom surfaces and forming radiused cutting edges at the juncture thereof with said top and bottom surfaces, and a plurality of radiused corner side surfaces also extending between said top and bottom surfaces, wherein each side surface extends between a first corner side surface and a second corner side surface. The concave top and bottom surfaces exhibit a substantially spherical shape and are each divided into four sectors by ribs extending in a substantially diagonal direction from the juncture of each of said corner side surfaces with said top and bottom surfaces, each pair of ribs extending on said top and bottom surfaces from adjacent corner side surfaces being connected by an arcuate chip breaking surface, said chip breaking surface being provided with chip controlling ridges arranged substantially crosswise thereof and conforming to the spherical shape of the corresponding sector to cause the chip to curl and to break.