| 摘要 |
PROBLEM TO BE SOLVED: To prevent chips from being accumulated at a corner of a suction bush at the time of CRPR drill processing in a boring device. SOLUTION: In this boring device, a pressing member pressing a workpiece from above comprises a chip suction part 19 connected to a dust collector and having a suction space formed inside, and a bush 20 connected to the chip suction part 19 and having a circular-sectioned suction space 52b formed at an inside part contacting a workpiece face. A plurality of slits 56 for communicating the suction space 52b of the bush 20 to the outside are formed on a workpiece contact end face of the bush 20 in a tangential direction or a radial direction, and the chips are collected by the dust collector via the chip suction part 19 in a following flow at the time of rotating a drill 4. COPYRIGHT: (C)2009,JPO&INPIT
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