| 摘要 |
A milling insert (102; 202) for centre cutting milling of material (134), which milling insert is arranged to be arranged in a seat (114) that is defined by a milling cutter body (112) and situated at a rotation axis (122) defined by the milling cutter body, the milling cutter body being connectable to a rotatable holder. The milling insert comprises a plurality of cutting edges (124, 136; 224), where at least one first cutting edge (124; 224) is terminated in or adjacent to a centre axis (120; 220) defined by the milling insert, the first cutting edge comprising a first cutting edge portion (148; 228) having a first radius (R 1 ) that is essentially equally great for each point of the first cutting edge portion. The first cutting edge comprises at least one second cutting edge portion (152; 252) that is plane or has at least one second radius (R 2 ) for each point of the respective second cutting edge portion, the at least one second radius being greater than the first radius. The at least one second cutting edge portion is situated between the first cutting edge portion and the centre axis, one of the at least one second cutting edge portion adjoins the first cutting edge portion, and one of the at least one second cutting edge portion is terminated in or adjacent to the centre axis. A tool for centre cutting milling of material, comprising said milling insert. A device for centre cutting milling of material, comprising a milling cutter body (312) that is connectable to a rotatable spindle or holder and defines a rotation axis (322), the milling cutter body comprising a plurality of cutting edges (324, 325, 336, 337), where at least one first cutting edge (324) corresponds to the first cutting edge mentioned above. |
