| 摘要 |
<p>A rotary cutting tool or end mill (10, 110) is provided, the tool (10, 110) comprising a plurality of pairs of diametrically-opposed, symmetrical, helical flutes (30, 32, 34) formed in a cutting portion (24) of the tool body (20), wherein the index angle (³, µ) between at least one pair of adjacent helical flutes (30, 32, 34) in at least one radial plane along the axial length of the flutes (30, 32, 34), a plurality of peripheral cutting edges (40, 42, 44), wherein at least one of the peripheral cutting edges (40, 42, 44) has a radial rake angle (±, ², ´, », Á, Ã, È, É) different from radial rake angle (±, ², ´, », Á, Ã, È, É) of a peripheral cutting edge (40, 42, 44) of a different helical flute (30, 32, 34).</p> |
