| 摘要 |
A cutting insert (3) for a rotary cutter tool (1), said insert being of substantially parallelepipedal shape, having a pair of opposite, parallel, major cutting edges (4a,4b) of length L and a pair of opposite subsidiary cutting edges (5a',5a'',5b',5b''), each subsidiary cutting edges being transversely directed with respect to the major cutting edges and comprising at least two successive, angularly disposed, component subsidiary cutting edges, a first component cutting edge of each subsidiary cutting edge merging, via a rounded nose portion (6a,6b), with an adjacent end of a major cutting edge and defining therewith an angleθ1 lying between 50 DEG -70 DEG , a further component cutting edge of each subsidiary cutting edge merging with an adjacent end of an opposite major cutting edge and defining therewith an angleθ2 lying between 20 DEG -40 DEG ; the total projected lengths of the component subsidiary cutting edges of each subsidiary cutting edge being approximately 0.6L. <MATH> |
