Rotary cutting tool
AssigneeSGS Tool Company
InventorsJason W. Wells, Paul S. Daniels, Douglas P. Bonfiglio, Jeffery L. Burton
Life of this patent
Estimating the term…
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 method of forming a rotary cutting tool comprising:
- providing a body having a cutting portion and a shank portion;
- a plurality of diametrically-opposed helical flutes formed in the cutting portion of the body, where adjacent helical flutes form an index angle therebetween in each radial plane along the axial length of the flutes;
- and a plurality of peripheral cutting edges formed along an intersection of a circumferential surface of the cutting portion of the body and a portion of an inner surface of a respective one of the helical flutes facing in a direction of rotation of the body, each peripheral cutting edge having a radial rake angle;
- forming the index angle between at least two adjacent helical flutes different from the index angle between at least one other pair of adjacent helical flutes in at least one of the radial planes;
- forming the radial rake angle of at least one peripheral cutting edge different from the radial rake angle of another peripheral cutting edge of a different helical flute;
- and
- forming a blended gash from an axial tangent point toward a radial tangent point.
A rotary cutting tool comprising:
- a body having a cutting portion and a shank portion;
- a plurality of diametrically-opposed helical flutes formed in the cutting portion of the body, wherein adjacent helical flutes form an index angle therebetween in each radial plane along the axial length of the flutes,
- a plurality of peripheral cutting edges formed along an intersection of a circumferential surface of the cutting portion of the body and a portion of an inner surface of a respective one of the helical flutes facing in a direction of rotation of the body, each peripheral cutting edge having a radial rake angle;
- the index angle between at least two adjacent helical flutes being different from the index angle between at least one other pair of adjacent helical flutes in at least one of the radial planes;
- and
- the cutting tool having an a blended gash extending from an axial tangent point toward a radial tangent point.
Dependencies are inferred from the claim text.