| 摘要 |
[PROBLEMS] To provide a cutting tool holder unit capable of largely increasing the life of a cutting tool by sufficiently feeding a cutting oil onto cutting tool faces even when a work with a complicated shape such as a cylinder head is machined. [MEANS FOR SOLVING PROBLEMS] This cutting tool holder unit comprises a cutting tool holder in which the cutting tool can be detachably installed and a flange-like front cover capable of being slidably fitted to the multi-spindle head installation side of the cutting tool holder. The cutting tool holder unit is characterized in that a groove formed in the inner peripheral surface of the front cover is slidably fitted to a groove formed in the cutting tool holder to form a cutting oil circulation passage and a cutting oil jetting outlet is opened on the upstream side of a cutting tool mounting part in the rotating direction of the cutting tool holder. |
