| 摘要 |
<p>PURPOSE: A drill tool equipped with a cutting insert is provided to prevent an inside insert and an outside insert from protruding from an overlapped section of the inside and outside inserts. CONSTITUTION: A drill tool equipped with a cutting insert comprises a drill body, an inside insert(10), and an outside insert. The inside insert is included of cutting edges(14,16) and a rounded corner part. A part of a rotational track of the inside and outside inserts is overlapped. The inside and outside inserts protrude on the rotational track in direction of a target cutting object.</p> |
