Fully Indexable Single-Sided Cutting Insert and Milling Tool

A fully indexable, single-sided cutting insert (10, 110) comprising:

• a top surface (12), an opposing bottom surface (14) different from the top surface (22) and a peripheral side surface (16) extending between the top and bottom surfaces (12, 14), the peripheral side surface (16) having N identical major sides (18), wherein N is an integer greater than 2 and each major side (18) is located between and merges with an adjacent major side (18);
• a cutting edge (20) associated with each major side (18), the cutting edge (20) comprising a major cutting edge (28) formed at the intersection of each major side (18) and the top surface (12), an auxiliary cutting edge (30), and a corner cutting edge (26) extending between the major and auxiliary cutting edge (28, 30);
• wherein:
• at least a section of the auxiliary cutting edge (30) adjacent the corner cutting edge (26) extends from the corner cutting edge (26) in a direction towards a plane (P) defined by the bottom surface (14);
• each cutting edge (20) is formed at the intersection of a relief surface (22) and a rake surface (24), the rake surface (24) extending in an inward direction of the cutting insert (10) from its associated cutting edge (20) to a side surface (44) of an associated major side (18), the rake surface (24) comprises major and auxiliary rake surfaces (40, 42) with a corner rake surface (38) extending therebetween and the relief surface (22) comprises major and auxiliary relief surfaces (34, 36) with a corner relief surface (32) extending therebetween;
• the corner, major and auxiliary cutting edges (26, 28, 30) are formed at the intersection of respective corner, major and auxiliary relief surfaces (32, 34, 36) with respective corner, major and auxiliary rake surfaces (38, 40, 42);
• and
• the cutting insert (10) has θ° rotational symmetry about an insert axis (A) passing through the top and bottom surfaces (12, 14), where θ=360°/N.