Rotary cutting tool
AssigneeSGS Tool Company
InventorsJason W. WELLS, Paul S. DANIELS, Douglas P. BONFIGLIO, Jeffery L. BURTON
Life of this patent
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Abstract
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.
Claims20
A rotary cutting tool comprising:
- a plurality of helical cutting edges having a common axis and common chirality,
- a first pair of helical cutting edges in which each helical cutting edge,
- is opposed across the common axis by the paired helical cutting edge,
- has a helix angle which varies by a first function of axial position,
- has a radial rake angle that is a function of axial position;
- and
- a second pair of helical cutting edges in which each helical cutting edge,
- is opposed across the common axis by the paired helical cutting edge,
- has a helix angle which varies by a second function of axial position different from said first function,
- has a radial rake angle that is a function of axial position.
A method of forming a rotary cutting tool comprising:
- providing a plurality of helical cutting edges having a common axis and common chirality,
- a first pair of helical cutting edges in which each helical cutting edge,
- is opposed across the common axis by the paired helical cutting edge,
- has a helix angle which varies by a first function of axial position,
- has a radial rake angle that is a function of axial position;
- and
- a second pair of helical cutting edges in which each helical cutting edge,
- is opposed across the common axis by the paired helical cutting edge,
- has a helix angle which varies by a second function of axial position different from said first function,
- has a radial rake angle that is a function of axial position.
Dependencies are inferred from the claim text.