| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent multiedged, large helical angle end mill which has improved cutting ability, and is suitable for heavy cutting such as grooving, and has a long tool life, and is applicable to finish cutting by smoothing discharge of chips and by preventing vibration in cutting, though multi-edged, large helical angle end mills tend to cause chip packing. SOLUTION: The radius end mill is characterized in that, in the radius end mill having helical cutting edges 2 on the outside periphery thereof and circular cutting edges at the outside periphery side of end cutting edges 8, the shape of the gash in the cross section perpendicular to the helical cutting edges is formed by the curves including the rake face, the bottom, the back flank, and the tertiary relief flank of the neighboring cutting edge, and approximately forms a U shape, and the rake face of the helical cutting edges is a curved face elongating in the radial direction from the rotational axis of the end mill in the range from the inside more than 5% of the outside diameter of the end mill to the cutting edge, and the rake face of the circular cutting edges is formed as a continuous convex surface along the cutting edge from the end of the cutting edge to the end of the end cutting edge. COPYRIGHT: (C)2003,JPO
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