| 摘要 |
An end mill enabling the suppression of vibration in cutting and the improvement of chip discharging property to provide both high cutting efficiency and long tool life. The first clearance angle ( a 1) of the outer peripheral edges (4a to 4d) of the end mill (1) is set to a range of more than 0{ to approximately 3{, the first clearance width (t1) of the outer peripheral edges (4a to 4d) is set to a range of approximately 0.005D or more to approximately 0.03D where the outside diameter is (D), and a helix angle ( r ) is set to an equal value for all the outer peripheral edges (4a to 4d) in a range of approximately 35{ or more to approximately 40{. As a result, the vibration in cutting can be suppressed, and the chip discharging property can be improved. |
