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.
Claims12
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 first helix angle;
- a second region which is located closer to the rear end than the first region and has a second helix angle smaller than the first helix angle;
- a connection region located between the first region and the second region and connected to the first region and the second region;
- and
- an elongated protruding part that
- is located on the second region,
- is not located on the first region, and
- is not located on the connection region.
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 first helix angle;
- a second region which is located closer to the rear end than the first region and has a second helix angle smaller than the first helix angle;
- a connection region located between the first region and the second region and connected to the first region and the second region;
- and
- an elongated protruding part that is located on the second region and is not located on both the first region and the connection region,
- wherein a helix angle of the connection region changes from the first helix angle to the second helix angle as going from a front end of the connection region to a rear end of the connection region, and
- wherein the second region comprises:
- a second flute located behind the elongated protruding part in a rotational direction of the rotation axis, and connected to the connection region;
- and
- a third flute located ahead of the elongated protruding part in the rotational direction and separated from the connection region.
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 first helix angle;
- a second region which is located closer to the rear end than the first region and has a second helix angle smaller than the first helix angle;
- a connection region located between the first region and the second region and connected to the first region and the second region;
- and
- an elongated protruding part that is located on the second region, is separated from the first region and is separated from the connection region.
Dependencies are inferred from the claim text.