Cutting tool and round double-sided cutting insert for the tool

摘要

The present invention relates to a double-sided cutting insert (18, 118) for retention in a rotating cutting tool (10) having an axis of rotation (A). The cutting insert comprises two opposing end surfaces (28, 128) and a peripheral side surface (26) extending therebetween. Each end surface has a mutual first axis of symmetry (B) passing through the end surfaces about which each end surface has N-fold rotational symmetry for some value of N where N is chosen from the group of 2, 3 and 4. The cutting insert further comprisses a peripheral cutting edge (66, 166) formed at the junction between each end surface and the peripheral side surface, the peripheral cutting edge comprising N curved cutting edges (32, 34; 132, 134) merging with N straight cutting edges (44, 50; 144, 150) which extend between the curved cutting edges at extremities thereof. Additionally, the cutting insert comprises a through bore (30), having a through bore axis constituting the first axis of symmetry (B), that extends between the two end surfaces (28); wherein: the curved cutting edges of the two end surfaces do not overlap in a direction along the first axis of symmetry (B); and the peripheral side surface (26) comprises a first (58), second (60), third (62) and fourth (64) pair of side abutment surfaces, each pair of side abutment surfaces having 180° rotational symmetry around the through bore axis (B).