| 摘要 |
<p>A cutting tool (10) has a cutting insert (14) retained within an insert pocket (16) of an insert holder(12) by a retaining screw(18). Spaced apart first insert rear abutment surfaces (42) abut 'spaced apart first pocket rear abutment surfaces (78), a second insert rear abutment surface (45) abuts a second pocket rear abutment surface (82), and' spaced apart insert lower abutment surfaces (56) abut spaced apart pocket lower abutment surfaces (88). The cutting insert (14) has a first dimension (D1) taken between extremities of the insert side surfaces (28), a second dimension (D2) taken between extremities of the insert upper(30) and lower (32) surfaces, and, a fourth dimension (D4) taken between the insert lower abutment surfaces (56) and the insert upper surface (30). The size ratio between the fourth dimension (D4) and the second dimension (D2) is in the range of 0.2 to 1, and, preferably, in the range of 0.55 to 0.6. The size ratio between the first dimension (D1) and the second dimension (D2) is in the range of 1 to 2.</p> |
