| 摘要 |
A plurality of grooves (27) is formed and a plurality of insert seats (28) is formed in each of the grooves, and cutting inserts (30) are removably arranged onto the insert seats (28). The cutting insert (30) has a major cutting edge (34), a corner cutting edge, and a minor cutting edge (35). The major cutting edge (34) is formed in a wave shape as viewed from a direction of a rake surface. The cutting inserts (30) are arranged such that, in rotational trajectories formed by the major cutting edges (34) of the respective cutting inserts (30) when a roughing cutter (10) is rotated around a rotational axis (O), the phases of the waves of the rotational trajectories formed by the cutting inserts (30) that are adjacent to each other in a direction along the rotational axis O coincide with each other in one groove (27), and such that the rotational trajectories of at least part of cutting edge portions of at least some cutting inserts (30) are overlapped with each other in the direction of the rotational axis (O). Accordingly, even when the cutting edge portion is used as a major cutting edge and as an inner cutting edge, it is still possible to reduce cutting load and suppress breakage. |
