| 摘要 |
An indexable cutting insert ( 10 ) having a top surface ( 12 ) including a substantially planar central portion ( 48 ), a substantially planar bottom surface ( 14 ), and a plurality of side surfaces ( 16, 18, 20, 22 ). A long cutting edge ( 24, 26 ), a corner radius cutting edge ( 28, 30 ), a facet radius cutting edge ( 32, 34 ), and ramping cutting edge ( 36, 38 ) are defined at an intersection between the top surface ( 12 ) and one of the side surfaces ( 16, 18, 20, 22 ). A margin ( 87, 89 ) extends around a nose radius of the cutting insert ( 10 ) and blends into a flat surface ( 94, 96 ). A margin angle, C, formed by the margins ( 87, 89 ) is less than a seating angle, B, formed by the flat surfaces ( 94, 96 ). The top surface ( 12 ) includes a plurality of upward sloping radius blends ( 50, 52, 54, 56, 58, 60, 62, 64 ) extending between the substantially planar central portion ( 48 ) and a plurality of upward sloping rake faces ( 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92 ) extending between a respective radius blend and its respective cutting edge such that the rake face forms an angle, A, of between five and twenty-five degrees with respect to the central portion ( 48 ) of the top surface ( 12 ).
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