| 摘要 |
<p>A radius end mill including an end mill body which is rotated around an axis thereof; a chip discharge flute being provided at an outer periphery of a tip portion of the end mill body; a gash being provided at a tip portion of the chip discharge flute; a rake face being formed on a wall face facing an end-mill rotational direction in the chip discharge flute or the gash; a cutting edge being formed on the rake face; the cutting edge including an end cutting edge, an outer peripheral cutting edge, and a convex circular-arc-shaped corner cutting edge; the end cutting edge being formed at a side ridge portion on the tip portion of the rake face; the outer peripheral cutting edge being formed at a side ridge portion on the outer peripheral side of the rake face; the convex circular-arc-shaped corner cutting edge being formed at a corner side ridge portion formed by the end cutting edge and the outer peripheral cutting edge; wherein the corner cutting edge has a positive cutting edge inclination angle; and the portion of the rake face on the side of the side ridge portion along at least a portion of the corner cutting edge is inclined toward the rear side in the end-mill rotational direction as it approaches the outer peripheral cutting edge from the end cutting edge, and is formed in the shape of a twist face whose inclination toward the rear side in the end-mill rotational direction gradually becomes larger as it approaches the center of the convex circular arc formed by the corner cutting edge from the corner cutting edge.</p> |
