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US 2017/0326652 A1Published application
Drill and method of manufacturing machined product using the same
AssigneeKYOCERA Corporation
InventorsKenichirou KOGA, Hirokazu HATANO
Life of this patent
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Abstract
A drill according to an embodiment includes a bar-shaped drill body extending along a rotation axis, a cutting edge located at a front end of the drill body, and a first flute extending spirally from the cutting edge toward a rear end of the drill body. The first flute includes a first region which is located close to the front end and has a helix angle θ1, and a second region which is located closer to the rear end than the first region and has a helix angle θ2 smaller than the helix angle θ1. The second region includes an elongated protruding part along the first flute.
Claims7
A drill, comprising:
- a bar-shaped drill body extending along a rotation axis;
- a cutting edge located at a front end of the drill body;
- and
- a first flute extending spirally from the cutting edge toward a rear end of the drill body,
- wherein the first flute comprises a first region which is located close to the front end and has a helix angle θ1, and a second region which is located closer to the rear end than the first region and has a helix angle θ2 smaller than the helix angle θ1, and
- wherein the second region comprises an elongated protruding part along the first flute.
3 more elements
Dependencies are inferred from the claim text.