| 摘要 |
<p>A rotational cutting tool 10 includes a plurality of unit cutting tools 11A to 11C including rotational bodies 12A to 12C each in a cylindrical shape and formed with attachment grooves 25 twisted relative to an axial direction and extending between opposite ends at plural locations in a circumferential direction on an outer peripheral surface of the rotational body, and flat plate-like replaceable blades 31 slidably mounted to the attachment grooves 25, the unit cutting tools 11A to 11C coaxially overlapped to one another in such a manner that the attachment grooves 25 of the unit cutting tools adjacent to each other are not overlapped to each other in the direction along which the attachment grooves 25 are extending. Between opposite ends in an axial direction on an outer peripheral surface of at least one of a pair of the unit cutting tools adjacent to each other, replacement grooves 51 that are capable of receiving the replaceable blades 31 are formed as extensions from the attachment grooves 25 of the other unit cutting tool.</p> |
