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US 10,882,121 B2Granted
Drill and method for manufacturing machined product
AssigneeKYOCERA Corporation
InventorHironori Nishikoori
Life of this patent
Estimating the term…
Abstract
A drill according to a non-limiting aspect may have a body, a cutting edge, a rake face, and a groove. The cutting edge may have a curved chisel edge, a pair of first cutting edges, and a pair of second cutting edges. The second cutting edge may have a first portion extending from the chisel edge and a second portion extending from the first portion toward the first cutting edge. The rake face may have a first region extending from the first portion and a second region extending from the second portion. A first rake angle of the first region may be zero or a negative value. A second rake angle of the second region may be a negative value. An absolute value of the second rake angle may be greater than an absolute value of the first rake angle.
Claims18
A drill comprising:
- a body having a rod shape and extending along a rotational axis from a first end toward a second end;
- a cutting edge positioned at the first end;
- a rake face extending from the cutting edge toward the second end;
- and
- a groove extending spirally from the rake face toward the second end,
- wherein
- the cutting edge comprises:
- a curved chisel edge intersecting with the rotational axis,
- a first cutting edge closer to an outer periphery of the body than the chisel edge, and
- a second cutting edge connected to, and located between, the chisel edge and the first cutting edge;
- the second cutting edge, in a front view of the first end, comprises:
- a first portion having a linear shape and extending from the chisel edge toward the outer periphery, and
- a second portion in its entirety having a linear shape, directly connected to the first portion, extending from the first portion toward the first cutting edge, and inclined with respect to the first portion;
- the rake face comprises:
- a first region, spaced apart from the rotational axis, extending from the first portion and having a first rake angle,
- a second region extending from the second portion and having a second rake angle, and
- the first region and the second region being distinct surfaces;
- at least a portion of the second region is closer to the second end than the first region;
- a width of the first region in a direction orthogonal to the rotational axis becomes narrower moving continuously along the first region in a direction away from the first portion in a side view;
- a width of the second region in the direction orthogonal to the rotational axis becomes narrower moving continuously along the second region in a direction away from the second portion in the side view;
- the first rake angle is either zero or a negative value;
- the second rake angle is a negative value;
- and
- an absolute value of the second rake angle is greater than an absolute value of the first rake angle.
21 more elements
A drill comprising:
- a body having a rod shape and extending along a rotational axis from a first end toward a second end;
- a cutting edge positioned at the first end;
- a rake face extending from the cutting edge toward the second end;
- and
- a groove extending spirally from the rake face toward the second end,
- wherein
- the cutting edge comprises:
- a curved chisel edge intersecting with the rotational axis,
- a first cutting edge closer to an outer periphery of the body than the chisel edge, and
- a second cutting edge connected to, and located between, the chisel edge and the first cutting edge;
- the second cutting edge, in a front view of the first end, comprises:
- a first portion having a linear shape and extending from the chisel edge toward the outer periphery, and
- a second portion in its entirety having a linear shape, directly connected to the first portion, extending from the first portion toward the first cutting edge, and inclined with respect to the first portion;
- the rake face comprises:
- a first region, spaced apart from the rotational axis, extending from the first portion, the first region having a first rake angle and being a substantially triangular-shaped surface in a side view of the drill,
- a second region extending from the second portion, the second region having a second rake angle and being a substantially triangular-shaped surface in the side view of the drill, and
- a boundary between the first region and the second region;
- at least a portion of the second region is closer to the second end than the first region;
- the first rake angle is either zero or a negative value;
- the second rake angle is a negative value;
- and
- an absolute value of the second rake angle is greater than an absolute value of the first rake angle.
19 more elements
Dependencies are inferred from the claim text.