End mill and method of manufacturing machined product
AssigneeKYOCERA Corporation
InventorMasahiko Kuroda
Life of this patent
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Abstract
An end mill includes a bar-shaped body, a cutting edge, a gash, a first flute, and a second flute. The body extends from a first end to a second end along a rotation axis. The cutting edge is located at a side of the first end of the body. The gash is located adjacent to the cutting edge. The first flute surrounds the gash and spirally extends from the gash toward the second end. The second flute surrounds the first flute and spirally extends from the first flute toward the second end. A depth of the first flute is greater than a depth of the second flute in a cross section orthogonal to the rotation axis.
Claims19
An end mill, comprising:
- a bar-shaped body extending from a first end to a second end along a rotation axis;
- a cutting edge located at a side of the first end of the body;
- a gash located adjacent to the cutting edge;
- a first flute surrounding the gash and spirally extending from the gash toward the second end;
- and
- a second flute surrounding the first flute and spirally extending from the first flute toward the second end, wherein
- a depth of the first flute is greater than a depth of the second flute in a cross section orthogonal to the rotation axis, and
- the second flute comprises two adjacent flute parts located closer to the second end than the first flute and having a concave curved surface shape in a cross section orthogonal to the rotation axis.
An end mill, comprising:
- a bar-shaped body extending from a first end to a second end along a rotation axis:
- a cutting edge located at a side of the first end of the body;
- a gash located adjacent to the cutting edge;
- a first flute surrounding the gash and spirally extending from the gash toward the second end;
- and
- a second flute surrounding the first flute and spirally extending from the first flute toward the second end, wherein
- a depth of the first flute is greater than a depth of the second flute in a cross section orthogonal to the rotation axis;
- the cutting edge comprises four or more members comprising two first members which pass through the rotation axis and are mutually located in a rotation symmetrical manner, and two second members which are spaced away from the rotation axis and mutually located in a rotation symmetrical manner in an end surface view from the side of the first end;
- and
- a depth of the first flute extending from the first member is greater than a depth of the first flute extending from the second member in a cross section orthogonal to the rotation axis.
Dependencies are inferred from the claim text.