| 摘要 |
PURPOSE:To keep the shaft center of a machining tool in high accuracy as well as to make high speed machining performable, by improving the supply of cutting oil and the discharge of chips so good enough at the time of boring after positioning the bar rotary machining tool to a workpiece via a jig. CONSTITUTION:A boring bar 7 as a bar rotary machining tool where plural cutting tools are tightly installed is passed through support holes 78, 83 and 79 of a jig 8, and positioned (184) through a bearing hole 11 of a work W. The boring bar 7 is rotated at high speed, and the bearing hole 11 is bored by a cutting tool 63. Cutting oil is fed to an interval between a bearing 82 and an inner sleeve 162. Chips are discharged through a clearance installed in a bearing 77.
|
