| 摘要 |
[Problem] To enhance the effect of discharging chips from gashes (7) and the effect of guiding the chips to blade grooves (8) when high-speed, high-feed cutting is performed on a thin member such as an impeller made from a difficult-to-machine alloy using a multi-edge end mill having gashes and blade grooves. [Solution] The rake face of a cutting edge (3) comprises: a rake face (6a) of an end cutting edge (6) disposed from the side at the rotation axis (O) to the radially outer circumferential side; and a rake face (4a) of an outer peripheral edge (4) which also functions as the rake face of a corner R edge (5), the rake face (4a) being formed adjacent to the rake face (6a) as a face that is different from the rake face (6a) of the end cutting edge (6). The point of intersection between a convex ridge line (64), which is located at the boundary between the rake face (6a) of the end cutting edge (6) and the rake face (4a) of the outer peripheral edge (4), and a convex ridge line (68), which is located at the boundary between the rake face (6a) of the end cutting edge (6) and the bottom surface (8b) of a blade groove (8), is arranged further toward the rotation axis (O) in the radial direction than the boundary between the flank face (5b) of the corner R edge (5) and the flank face (6b) of the end cutting edge (6). |
