Patent ID: 8529164

Claim:
A multilayer cutting insert ( 22 ) comprising a first layer ( 34 ) made of a first material and a second layer ( 36 ) made of a second material, the first material being harder than the second material, the multilayer cutting insert ( 22 ) comprising opposing first and second major side surfaces ( 38 , 40 ) and a peripheral side surface ( 42 ) extending therebetween; the first major side surface ( 38 ) being formed in the first layer ( 34 ) and comprising a non-uniform relief surface ( 54 ); the peripheral side surface ( 42 ) being formed in the two layers and comprising a non-uniform rake surface ( 52 ), and the rake surface ( 52 ) and the relief surface ( 54 ) intersecting at an edge, at least portion of which is a curved major cutting edge ( 58 ); the rake surface ( 52 ) being formed in at least the first layer ( 34 ) and the relief surface ( 54 ) being formed only in the first layer ( 34 ), wherein the second layer ( 36 ) is devoid of cutting edges and relief surfaces.