| 摘要 |
PROBLEM TO BE SOLVED: To enhance an attaching/detaching operationality and swinging-out accuracy by detachably mounting a drilling tool on the main body of a cutting tool by a hydro-chuck structure, and to sufficiently secure the rigidity of the tool.SOLUTION: A cutting tool is provided with: a tool body 2 rotated around an axial line O; a cylindrical part 7 provided at the end of a tip side of the tool body 2 in the direction of the axial line O of the tool body 2 and extending in the axial line O direction; a drilling tool 3 which has an axis shape, is detachably fitted to the inside of the cylindrical part 7 in a radial direction and extends protrudingly from the cylindrical part 7 toward a tip side; and a head part 9 which is cylindrical, is fitted to the outside of the cylindrical part 7 in the radial direction and has a cutting blade provided on an outer peripheral part thereof. The peripheral wall of the cylindrical part 7 comprises an outer wall 19, an inner wall 20 and a fluid chamber 18 which is defined between the outer and inner walls 19 and 20 and has the inside filled with a fluid. The outer wall 19 is elastically deformed toward the outside in the radial direction by enhancing the pressure of the fluid in the fluid chamber 18 and is pressed to the head part 9. The inner wall 20 is elastically deformed toward the inside in the radial direction and is pressed to the drilling tool 3. |
