| 摘要 |
The invention relates to an indexable milling insert of the type that comprises an upperside (11), an underside (12) and two cutting edges (6), which individually include a cutting edge line (13) and are formed between a chip surface (14) included in the upperside (11) and a clearance surface (15) extending between the upperside and the underside, which clearance surface has an acute, nominal clearance angle. Furthermore, the individual cutting edge (6) comprises a main edge (18), which extends from an initial end (21) to a corner edge (19) having a smaller radius of curvature than the main edge (18). Between the cutting edge line (13) and the first clearance surface (15), a second clearance surface (26) of uniform width is formed, which has a width of at most 0,3 mm and the clearance angle of which is without exception smaller than the clearance angle of the first clearance surface (15) and decreases successively in the direction from the initial end (21) toward the corner edge (19). Thanks to the second clearance surface, tendencies to vibrations will be counteracted without substantially increasing harmful generation of heat. |
