| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inversed spot facing cutting tool capable of restraining rotational resistance to an inner peripheral surface of a prepared hole, by protruding-retreating a blade tool in the radial direction with a simple structure. <P>SOLUTION: This inversed spot facing cutting tool 11 includes a main shaft 12 extending along the axis and installing a rear end part in the axial direction in a holder of a machine tool, the blade tool 13 rotatably supported by a tip part in the axial direction of the main shaft and put in a storage position of falling along the main shaft and a projection position of rising to the main shaft, a cylindrical body slidably arranged in the axial direction on the outer periphery of the main shaft, that is, a guide sleeve 16 having a window 18 on a side surface and put in the projection position by projecting the blade tool 13 outside in the radial direction from the window 18 by exposing the blade tool from the window 18 in a tip side position in the axial direction, and a low friction part 16s arranged in an area of contacting with at least the prepared hole of a workpiece to be processed on an outer peripheral surface of the guide sleeve and reducing friction with the workpiece. <P>COPYRIGHT: (C)2012,JPO&INPIT |
