Patent ID: 8550754

Claim:
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 side surface having at least one abutment region ( 64 ′, 66 ′), the rake surface ( 24 ) comprises major and auxiliary rake surfaces ( 40 , 42 ) with a corner rake surface ( 38 ) extending therebetween and the major rake surface ( 40 ) being spaced apart from the bottom surface ( 14 ) by the side surface ( 44 ), 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.