US 12,220,753 B2
Rotary tool and method for manufacturing machined product
Hiroshi Ogawa, Omihachiman (JP)
Assigned to KYOCERA CORPORATION, Kyoto (JP)
Appl. No. 17/416,516
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050510
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/138033, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-240811 (JP), filed on Dec. 25, 2018.
Prior Publication US 2022/0080516 A1, Mar. 17, 2022
Int. Cl. B23B 51/06 (2006.01); B23C 5/10 (2006.01); B23C 5/28 (2006.01)
CPC B23B 51/06 (2013.01) [B23C 5/10 (2013.01); B23B 2250/12 (2013.01); B23C 5/28 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A rotary tool, comprising:
a base which has a bar shape and is extended along a rotation axis from a first end toward a second end,
wherein
the base comprises
a cutting part including the first end,
a shank part located closer to the second end than the cutting part, and
a flow path which is located inside the base and is extended along the rotation axis,
the cutting part comprises
an outer peripheral surface,
a first cutting edge extended from the first end toward the outer peripheral surface,
a first flute spirally extended from the first cutting edge toward the second end, and
a first ridgeline formed by the first flute and the outer peripheral surface adjacent to the first flute on a rear side in a rotation direction of the rotation axis,
the flow path comprises
a main flow path extended from a side of the second end toward the first end, and
a first sub flow path extended from the main flow path toward the second end,
the first sub flow path comprises a first opening that opens into the first flute,
a first angle formed by the rotation axis and the first sub flow path is smaller than a helix angle formed by the rotation axis and the first ridgeline,
the first ridgeline comprises
a first portion, and
a second portion located closer to the second end than the first portion, and
a first helix angle formed by the rotation axis and the first portion is different from a second helix angle formed by the rotation axis and the second portion.