公开(公告)号：US20210213545A1

公开(公告)日：2021-07-15

申请号：US17134766

申请日：2020-12-28

Applicant: UNION TOOL CO.

Inventor： Hironobu SAITO ,  Hideki OSAKI ,  Hidehito WATANABE

IPC: B23C5/06

Abstract: It is an object of the present invention to provide a rotary cutting tool that can divide chips at an appropriate size, suppress the incidence of edge chipping and damage attributed to chips to the cutting tool and a workpiece, extend the tool service life with regard to the machining of hard, brittle materials, and improve machining efficiency. The rotary cutting tool includes a hard coat film 3 coated onto a tip end section of a tool body 1 having a chip discharge groove 2. A rake face 6 is concavely provided in a cutting edge-side chip discharge groove formation surface 4 constituting the chip discharge groove 2 of the tool body 1, from a cutting edge 5 and along the cutting edge 5.