Tool and method of manufacturing tool
A tool of the present disclosure includes a tip end portion. The tip end portion has a surface. At least a part of the surface includes a plurality of protrusions, a first recess provided by contact between ends of two adjacent protrusions of the protrusions, and a second recess different from the first recess. The second recess is provided inside at least one of the protrusions or provided to extend across the two adjacent protrusions.
1 . A tool comprising a tip end portion, wherein
the tip end portion has a surface,
at least a part of the surface includes a plurality of protrusions, a first recess provided by contact between ends of two adjacent protrusions of the protrusions, and a second recess different from the first recess, and
the second recess is provided inside each of the protrusions or provided to extend across the two adjacent protrusions,
wherein the protrusions are partial spherical surfaces with the second recesses cut into the partial spherical surfaces, and
wherein the entire circumference of each of the protrusions is surrounded by the first recesses.
2 . The tool according to claim 1 , wherein a depth of the second recess is 0.5 μm or more and 20 μm or less.
3 . The tool according to claim 1 , wherein a length of the second recess in a longitudinal direction of the second recess is equal to or greater than a value obtained by multiplying a depth of the second recess by twice as large as a sine of an inclination angle of a side surface of the second recess, and equal to or less than 100 μm.
4 . The tool according to claim 1 , wherein an inclination angle of a side surface of the second recess is more than 0° and equal to or less than 45°.
5 . The tool according to claim 1 , wherein an area ratio of the second recesses in the surface is 3 percent or more and 80 percent or less.
6 . The tool according to claim 1 , wherein the tool is a measurement tool for measuring surface roughness or a shape of a workpiece.
7 . The tool according to claim 1 , wherein the tool is a processing tool for processing a workpiece.
8 . The tool according to claim 7 , wherein
the surface includes a partial spherical surface, and
the tool is rotated around a rotation axis to process the workpiece, the rotation axis passing through a center of the partial spherical surface.
9 . The tool according to claim 8 , wherein a width direction of the second recess extends in a circumferential direction around the rotation axis.
10 . The tool according to claim 7 , wherein the surface includes a groove and a cutting edge that is formed along a ridgeline between the groove and a partial spherical surface.
11 . The tool according to claim 7 , wherein a height of each of the protrusions is 0.05 μm or more and 20 μm or less.
12 . The tool according to claim 7 , wherein an arithmetic mean height of the surface in each of the protrusions is 0.05 μm or more and 5 μm or less.
13 . The tool according to claim 7 , wherein a skewness parameter in a portion provided with the protrusions and the first recesses in the surface is less than 0.
14 . The tool according to claim 1 , wherein
the tool is a cutting tool for cutting a workpiece, and
the surface includes a rake face, a flank face contiguous to the rake face, and a cutting edge formed along a ridgeline between the rake face and the flank face.
15 . The tool according to claim 1 , wherein the tip end portion is formed of a nano-polycrystalline diamond.
16 . The tool according to claim 15 , wherein the nano-polycrystalline diamond contains atoms belonging to Group 13 or Group 15 in a long periodic table.
17 . The tool according to claim 1 , wherein the tip end portion is formed of binderless cubic boron nitride.
18 . A method of manufacturing a tool, the method comprising:
preparing a tip end portion; and
by irradiation with laser, forming a plurality of protrusions in at least a part of a surface of the tip end portion,
a first recess being provided in a part of the surface of the tip end portion by contact between ends of two adjacent protrusions of the protrusions, the method further comprising:
by irradiation with laser, providing a second recess to be inside each of the protrusions or to extend across the two adjacent protrusions,
wherein the protrusions are partial spherical surfaces with the second recesses cut into the partial spherical surfaces, and
wherein the entire circumference of each of the protrusions is surrounded by the first recesses.
19 . The method of manufacturing a tool according to claim 18 , further comprising, by irradiation with laser, forming a rake face and a flank face contiguous to the rake face on the surface of the tip end portion.
20 . A tool comprising a tip end portion, wherein
the tip end portion has a surface,
at least a part of the surface includes a plurality of protrusions, a first recess provided by contact between ends of two adjacent protrusions of the protrusions, and a second recess different from the first recess, and
the second recess is provided inside each of the protrusions or provided to extend across the two adjacent protrusions,
wherein the protrusions are partial spherical surfaces with the second recesses cut into the partial spherical surfaces, and
wherein each of the protrusions is surrounded by the first recesses,
wherein each of the first recesses has a linear shape in plan view and each protrusion is formed by an inside region surrounded by a plurality of the linear shape first recesses.