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1. (WO2018221737) ROTARY TOOL

Pub. No.:    WO/2018/221737    International Application No.:    PCT/JP2018/021251
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat Jun 02 01:59:59 CEST 2018
IPC: B23B 51/00
Inventors: OGAWA, Hiroshi
小川 浩
渡邉 喬也
A rotary tool according to one embodiment of the present invention has a main body having a rotation axis, a portion of the main body including a first end being a first section, and a portion of the main body that is located further toward a second end than the first section and has an outside diameter greater than that of the first section being a second section. The main body is provided with: a ridge part located on the first section and the second section, the ridge part extending from the first end to the second end in a helical shape; a cutting blade located on at least a part of the ridge part; and a flute located along the ridge part. The portion of the flute corresponding to the first section is a first flute, and the portion of the flute corresponding to the second section is a second flute. A second helix angle of the second flute is smaller than a first helix angle of the first flute.