| 摘要 |
A mill (12, 60) has a front cutting portion with a plurality of peripheral cutting edges (26, 80) extending rearwardly from a front cutting end (18, 66). Each peripheral cutting edge (26, 80) is adapted to generate a corresponding outer envelope of a body of revolution as the mill (12, 60) rotates around its longitudinal axis (A,A2). At least one cutting edge (26, 80) is adapted to generate a cylindrical outer envelope (46); at least one cutting edge (26, 80) is adapted to generate a generally frusto-conical taper outer envelope (42) extending away from the front cutting end while tapering radially outwardly; and at least one cutting edge is adapted to generate a generally frusto-conical dovetail outer envelope (44) extending away from the front cutting end while tapering radially inwardly. ® KIPO & WIPO 2009 |
