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US 9,211,593 B2Granted
End mill having an asymmetric index angle arrangement for machining titanium
AssigneeIscar, Ltd.
InventorsEliyahu Budda, Alexander Khina, Gabby Zehavi
Life of this patent
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Abstract
An end mill for machining titanium includes a cutting portion having blunt teeth alternated with flutes. Each flute includes, in order from the cutting edge, a rake surface, a concavely shaped bending portion, a convexly shaped ejecting portion and a tooth relief edge. The convexly shaped ejecting portion has an ejection height E, which is measurable between an apex of the ejecting portion to an imaginary straight line extending from a nadir of the adjacent bending portion of the flute to the adjacent tooth relief edge. In a plane perpendicular to a rotation axis of the end mill, the ejection height E and a cutting portion diameter DE, fulfill the condition 0.010DE<E<0.031DE.
Claims36
An end mill for machining titanium, having a longitudinally extending rotation axis AR and comprising:
- a shank portion, and
- a cutting portion extending from the shank portion to a cutting end face and being integrally formed with at least four cutting teeth alternated with helically shaped flutes and having a cutting portion diameter DE;
- each tooth comprising
- a rake surface,
- a relief surface,
- a cutting edge formed at an intersection of the rake and relief surfaces, and
- a relief edge spaced apart from the cutting edge and formed at an intersection of the relief surface and an adjacent surface of the flute succeeding the tooth
- each rake surface comprising
- a rake recessed sub-surface,
- a rake cutting sub-surface positioned further than the rake recessed sub-surface from the rotation axis and raised above the rake recessed sub-surface, relative to an imaginary radial line passing through the cutting edge, and
- a rake discontinuity formed at an intersection of the rake recessed and rake cutting sub-surfaces;
- wherein each tooth comprises an actual internal cutting angle formed at an intersection of the rake cutting sub-surface and the relief surface, the actual internal cutting angle having a greater value than an imaginary internal cutting angle formed at an intersection of imaginary extension lines of the rake recessed sub-surface and the relief surface;
- wherein, in a plane perpendicular to the rotation axis AR, each flute comprises a convexly shaped ejecting portion and a concavely shaped bending portion connecting the ejecting portion and the rake recessed sub-surface;
- wherein each flute has a helix angle H;
- wherein the ejecting portion has an ejection height E which is measurable between an apex of the ejecting portion to an imaginary straight line extending from a nadir of the adjacent bending portion to the adjacent relief edge, the ejection height E having a magnitude fulfilling the condition 0.010DE <E <0.031DE;
- and
- wherein, at the cutting end face, index angles of the flutes are in an asymmetric arrangement.
14 more elements
An end mill for machining titanium, having a longitudinally extending rotation axis AR and comprising:
- a shank portion, and
- a cutting portion extending from the shank portion to a cutting end face and being integrally formed with at least four cutting teeth alternated with helically shaped flutes and having a cutting portion diameter DE;
- each tooth comprising
- a rake surface,
- a relief surface,
- a cutting edge formed at an intersection of the rake and relief surfaces, and
- a relief edge spaced apart from the cutting edge and formed at an intersection of the relief surface and an adjacent surface of the flute succeeding the tooth
- each rake surface comprising
- a rake recessed sub-surface,
- a rake cutting sub-surface positioned further than the rake recessed sub-surface from the rotation axis and raised above the rake recessed sub-surface, relative to an imaginary radial line passing through the cutting edge, and
- a rake discontinuity formed at an intersection of the rake recessed and rake cutting sub-surfaces;
- wherein each tooth comprises an actual internal cutting angle formed at an intersection of the rake cutting sub-surface and the relief surface, the actual internal cutting angle having a greater value than an imaginary internal cutting angle formed at an intersection of imaginary extension lines of the rake recessed sub-surface and the relief surface;
- wherein each tooth has a rake cutting sub-surface length dimension LD, measured from the rake discontinuity thereof to the cutting edge thereof, fulfilling the condition 0.01RT <LD <0.05RT, wherein RT is the tooth's radius dimension, measured in a straight line from the rotation axis to the cutting edge;
- wherein each tooth has a radial rake angle within a range of 6° to -6°;
- wherein each flute has a helix angle H which fulfills the condition 30°<H <50°;
- wherein, in a plane perpendicular to the rotation axis AR, each flute comprises a convexly shaped ejecting portion and a concavely shaped bending portion connecting the ejecting portion and the rake recessed sub-surface;
- wherein the ejecting portion has an ejection height E which is measurable between an apex of the ejecting portion to an imaginary straight line extending from a nadir of the adjacent bending portion to the adjacent relief edge, the ejection height E having a magnitude fulfilling the condition 0.010DE <E <0.031DE;
- and
- wherein, at the cutting end face, index angles of the flutes are in an asymmetric arrangement.
16 more elements
Dependencies are inferred from the claim text.