Patent ID: 8449230

Claim:
A cutting insert ( 100 ) for use in a milling cutter comprising: two identical opposing end surfaces ( 102 a , 102 b ), each end surface being provided with an abutment surface ( 104 ); a peripheral side surface ( 110 ) extending between the two opposing end surfaces ( 102 a , 102 b ), the peripheral side surface comprising two opposing major side surfaces ( 112 a , 112 b ), two opposing minor side surfaces ( 114 a , 114 b ) and corner side surfaces ( 116 a , 116 b , 116 c , 116 d ) located between adjacent major and minor side surfaces; a peripheral edge ( 120 a , 120 b ) formed at the intersection of each end surface ( 102 a , 102 b ) and the peripheral side surface ( 110 ); each end surface ( 102 a , 102 b ) having four corners ( 130 a , 130 b , 130 c , 130 d ) including two diagonally opposed lowered corners ( 130 a , 130 d ) and two diagonally opposed raised corners ( 130 b , 130 c )), the lowered corners ( 130 a , 130 d ) being closer than the raised corners ( 130 b , 130 c ) to a median plane (M) of the cutting insert which median plane (M) passes through the major and minor side surfaces ( 112 a , 112 b , 114 a , 114 b ) and is mid-way between the end surfaces ( 102 a , 102 b ); wherein: at least one peripheral edge ( 120 a ) comprises two sets of cutting edges, each set of cutting edges comprising: a raised corner cutting edge ( 140 b ) associated with a first corner side surface ( 116 b ); a major cutting edge ( 142 b ) adjacent to the raised corner cutting edge ( 140 b ) and extending along a first major side surface ( 112 b ); a raised corner wiper edge ( 144 b ) adjacent to the raised corner cutting edge ( 140 b ) and extending along a first minor side surface ( 114 b ) which shares the first corner side surface ( 116 b ) with the first major side surface ( 112 b ); a lowered corner cutting edge ( 140 a ) associated with a second corner side surface ( 116 a ), the second corner side surface ( 116 a ) and the first corner side surface ( 116 b ) sharing the first minor side surface ( 114 b ); and a lowered corner wiper edge ( 146 a ) adjacent to the lowered corner cutting edge ( 140 a ) and extending along the first minor side surface ( 114 b ) towards the raised corner wiper edge ( 144 b ); and each corner side surface ( 116 a , 116 b , 116 c , 116 d ) is provided with concave clearance depression ( 150 ) which extends from the lowered corner cutting edge ( 140 a ), past the median plane (M), and in a direction of, but not intersecting, a raised corner cutting edge ( 130 c ) associated with the opposite peripheral edge ( 120 b ), the concave clearance depression ( 150 ) forming a relief surface ( 152 ) for the lowered corner cutting edge ( 140 a ) and being visible in both a major side view and a minor side view of the cutting insert.