CUTTING TOOL FOR MACHINING HOLE

摘要

A hole processing tool is provided to improve dynamic balance and rigidity of a tool body and to adjust a position of an insert simply and accurately. In a hole processing tool, a concave unit(30) opened toward an outside of a diameter direction for a tool body(21) and toward a front end portion of the tool body is positioned at the front end portion of the tool body rotated around an axis. An installation seat(31) is positioned at a rear side of a rotating direction(T) for the tool of the concave unit. A thickness direction of a plain insert(50) installed at the installation seat is faced toward the diameter direction of the tool body. A surface faced to an inside of the diameter direction for the tool body for the insert is a placing surface(51). The surface faced to the rear side of the rotating direction for the insert is a pressed surface(61). The surface faced to a front side of the rotating direction for the insert is an inclined surface(54). An outer peripheral cutting blade is positioned at a ridge part of the outside for the diameter direction of the tool body for the inclined surface. A digging blade is formed at the ridge part of the front end portion of the tool body. A back taper is positioned at the outer peripheral cutting blade and moved backward toward the inside of the diameter direction for the tool body gradually to a side of a rear end portion for the tool body. A pressing member(40) is positioned at the rear side of the rotating direction for the installation seat. The pressing member presses the pressed surface of the insert to adjust a position of the diameter direction for the outer peripheral cutting blade.