Rotary cutting tool

摘要

A rotary cutting tool or end mill is provided, the tool comprising a plurality of pairs of diametrically-opposed, symmetrical, helical flutes formed in a cutting portion of the tool body, wherein the pitch between at least one pair of adjacent helical flutes is less than or greater than the pitch of at least one other pair of adjacent helical flutes in at least one radial plane along the axial length of the flutes, a plurality of peripheral cutting edges, wherein at least one of the peripheral cutting edges has a radial rake angle different from radial rake angle of a peripheral cutting edge of a different helical flute.

主权项

1. An end mill rotary cutting tool comprising:
a body having a cutting portion and a shank portion; first and second pairs of helical flutes formed in the cutting portion of the body; a first pair of helical cutting edges formed on the first pair of helical flutes in which each helical cutting edge,
has a first helix angle in each radial plane along the axial length of the body which varies by axial position, and a second pair of helical cutting edges formed on the second pair of helical flutes in which each helical cutting edge,
has a second helix angle in each radial plane along the axial length of the body which varies by axial position and is different from said first helix angle.