| 摘要 |
The purpose of the present invention is to provide a plate-like member (2) wherein at least one cutting edge section (2A) and a holding section (2B) are positioned side by side along the longitudinal direction. The plate-like member has two facing side surfaces (7, 8), a top surface (3), a bottom surface (4), and two end faces (5, 6). The two side surfaces extend in the longitudinal direction, and the first side surface (7) is a curved surface expanding outward. The top and bottom surfaces extend between the two side surfaces. The two end faces extend in a direction intersecting the longitudinal direction, and the cutting edge section is positioned at least on one of the end faces (5). The top surface and/or bottom surface is a curved surface. The holding section has a constant profile across the longitudinal direction in a cross section taken perpendicular to the longitudinal direction. |
