| 摘要 |
PROBLEM TO BE SOLVED: To provide a radius end mill capable of ensuring cutting ability and strength of a corner radius cutting edge simultaneously, improving chip disposal property, and facilitating manufacture. SOLUTION: A chip discharging groove 4 twisted backward in the direction T of rotation of the end mill around an axial line O as approaching a rear end side is formed at the outer periphery of a tip part of an end mill main body 1 rotated around the axial line O. An outer peripheral cutting edge 7 is formed in a side ridge part on an outer periphery side of a wall face 5 facing the direction T of rotation of the end mill in the chip discharging groove 4, and an end gash 8 is formed at a tip of the chip discharging groove 4. A bottom cutting edge 11 being continuous from the outer peripheral cutting edge 7 through the corner radius cutting edge 12 is formed in a side ridge part on a tip side of a wall face 9 facing the direction T of rotation of the end mill of the end gash 8. The wall face 9 facing the direction T of rotation of the end mill of the end gash 8 is formed like a plane, and a ridge line L crossing the wall face 5 facing the direction T of rotation of the end mill in the chip discharging groove 4 crosses the corner radius cutting edge 12. COPYRIGHT: (C)2008,JPO&INPIT
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