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US 10,265,784 B2Granted
Ball end mill
AssigneeKYOCERA Corporation
InventorMasahiko Kuroda
Life of this patent
Estimating the term…
Abstract
[Object] To provide a ball end mill in which it is possible to improve wear resistance in the vicinity of the central axis at the tip of a ball-nosed end cutting edge and to suppress vibration of a tool body during machining. [Solution] A ball end mill 10 includes: a tool body 1 that rotates about a central axis O; and an arc-shaped ball-nosed end cutting edge 2 in a side view which is provided to start from the central axis O side on a tip side of the tool body 1 toward a rear side thereof. The ball-nosed end cutting edge 2 has a radius of curvature r that becomes gradually smaller from the central axis O side toward a periphery Q side.
Claims16
A ball end mill comprising:
- a tool body comprising a front end and a rear end and extending along a central axis;
- and
- a cutting edge having an arc-shape in a side view, and comprising
- a first end located at a side of the front end thereof and
- a second end located at a side of the rear end thereof;
- wherein
- a radius of curvature of the cutting edge becomes gradually smaller continuously from the first end to the second end;
- the cutting edge further comprises a middle point where a circle with a radius of R/2 and with the central axis intersects the cutting edge when a radius of the tool body is R;
- and
- a ratio of a radius of curvature of the cutting edge from the first end to the middle point to a diameter of the tool body is in a range of 0.8 to 2 and a ratio of a radius of curvature of the cutting edge from the middle point to the second end to the diameter of the tool body is in a range of 0.2 to 1.2.
7 more elements
A ball end mill comprising:
- a tool body comprising a front end and a rear end and extending along a central axis;
- and
- a cutting edge having an arc-shape in a side view, and comprising
- a first end located at a side of the front end thereof,
- a second end located at a side of the rear end thereof, and
- a middle point where a circle with a radius of R/2 and with the central axis intersects the cutting edge when a radius of the tool body is R;
- wherein
- when a radius of curvature at the first end is r1,
- when a radius of curvature at the second end is r2,
- when a radius of curvature at the middle point is r3,
- it satisfies r2<r3<r1;
- a ratio of a radius of curvature of the cutting edge at the first end to a diameter of the tool body is in a range of 1.5 to 2, the ratio of a radius of curvature of the cutting edge at the middle point to the diameter of the tool body is in a range of 0.8 to 1.2, and a ratio of a radius of curvature of the cutting edge at the second end to the diameter of the tool body is in a range of 0.2 to 0.6.
9 more elements
A ball end mill comprising:
- a tool body comprising a front end and a rear end and extending along a central axis;
- and
- a cutting edge having an arc-shape in a side view, and comprising
- a first end located at a side of the front end thereof and
- a second end located at a side of the rear end thereof;
- wherein
- a radius of curvature of the cutting edge becomes gradually smaller continuously from the first end to the second end;
- a ratio of a radius of curvature of the cutting edge at the first end to a diameter of the tool body is in a range of 1.5 to 2, the ratio of a radius of curvature of the cutting edge at a middle point to the diameter of the tool body is in a range of 0.8 to 1.2, and a ratio of a radius of curvature of the cutting edge at the second end to the diameter of the tool body is in a range of 0.2 to 0.6.
5 more elements
A ball end mill comprising:
- a tool body comprising a front end and a rear end and extending along a central axis;
- and
- a cutting edge having an arc-shape in a side view, and comprising
- a first end located at a side of the front end thereof,
- a second end located at a side of the rear end thereof, and
- a middle point where a circle with a radius of R/2 and with the central axis intersects the cutting edge when a radius of the tool body is R;
- wherein
- when a radius of curvature at the first end is r1,
- when a radius of curvature at the second end is r2,
- when a radius of curvature at the middle point is r3,
- it satisfies r2<r3<r1;
- and
- a ratio of a radius of curvature of the cutting edge from the first end to the middle point to a diameter of the tool body is in a range of 0.8 to 2 and a ratio of a radius of curvature of the cutting edge from the middle point to the second end to the diameter of the tool body is in a range of 0.2 to 1.2.
10 more elements
Dependencies are inferred from the claim text.