公开(公告)号：US20230321732A1

公开(公告)日：2023-10-12

申请号：US18010226

申请日：2020-06-17

Applicant: Sumitomo Electric Hardmetal Corp.

Inventor： Gaku HARADA ,  Satoru HIRAO ,  Ikurou ITOHARA

IPC: B23B27/16 ,  B23P15/28

CPC classification number: B23B27/1611 ,  B23P15/28

Abstract: A cutting insert includes a substrate and a cutting-edge insert. The substrate has, in a thickness direction of the substrate, a bottom surface, and a top surface opposite to the bottom surface. The top surface has a polygonal shape composed of a plurality of sides in a plan view as seen along the thickness direction. The top surface is provided with a projection projecting to a side opposite to the bottom surface along the thickness direction. The projection has a through-hole passing through the substrate along the thickness direction. The projection has a side surface contiguous to the top surface. The side surface is composed of a curved line protruding to a side opposite to the through-hole in the plan view as seen along the thickness direction.