| 摘要 |
In the case of this roughing end mil, multiple corner cutting edges (8) and peripheral cutting edges (5) are formed on the periphery of a tip section of an end mill body, and roughing parts (9) with a wavelike pattern of recesses and projections when viewed from the rotating direction of the end mill are formed on the peripheral cutting edges (5) with the phases of the recesses and projections of circumferentially adjoining peripheral cutting edges being offset from each other. Of the peripheral cutting edges (5), the peripheral cutting edge (5) with the roughing part having the closest tip projection (9A) to the tip of the roughing end mill is formed such that the radial peak (9C) of the tip projection part (9A) is aligned with the radial peak (8A) of the corner cutting edge (8) or is connected to the radial peak (8A) of the corner cutting edge (8) by a straight portion (10) that linearly extends when viewed from the rotating direction of the end mill, and the radial peaks (9C) of the tip projection parts (9A) of the roughing parts (9) of the other peripheral cutting edges (5) are connected to the radial peaks (8A) of the respective corner cutting edges (8) by straight portions (10) that linearly extend when viewed from the rotating direction of the end mill. |
