SPINDLE DEVICE OF MACHINE TOOL

摘要

A spindle device of a machine tool, which can prevent the liquefaction of atomized cutting fluid in atomized cutting fluid passages downstream of a straightening unit (14), enhance a responsiveness to an ejecting start or stop instruction, and prevent a waste of cutting fluid. The spindle device for a machine tool has atomized cutting liquid passages (e1, e2) each having a single-shape passage section and formed inside the device ranging from the spindle (1) to the tip end of a cutting tool (13) mounted thereto in one piece, and is operated so as to eject atomized cutting liquid fed from the spindle (1) from the tip end of the cutting tool (13) via the atomized cutting fluid passages (e1, e2), wherein a straightening unit (14) formed with a plurality of small-diameter passages (h) are provided in the middle of the cutting liquid passages (e1, e2).