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1. (WO2018221303) DRILL AND METHOD FOR MANUFACTURING CUTTING WORKPIECE

Pub. No.:    WO/2018/221303    International Application No.:    PCT/JP2018/019539
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Tue May 22 01:59:59 CEST 2018
IPC: B23B 51/00
Applicants: KYOCERA CORPORATION
京セラ株式会社
Inventors: HATANO, Hirokazu
波多野 弘和
Title: DRILL AND METHOD FOR MANUFACTURING CUTTING WORKPIECE
Abstract:
A drill according to one embodiment of the present invention has the shape of a rod extending from a first end toward a second end, the drill having a body that is capable of rotating about a rotational axis. The body comprises a cutting blade positioned toward the first end, a first groove extending from the cutting blade, and a second groove extending from the first groove. The first groove comprises, in a cross-section orthogonal to the rotational axis, a concavely curved first portion positioned rearward in the rotation direction and a convexly curved second portion positioned forward in the rotation direction. The second groove has, in a cross-section orthogonal to the rotational axis, a concavely curved shape from an end part positioned forward in the rotation direction toward an end part positioned rearward in the rotation direction.