SPINDLE DEVICE OF MACHINE TOOL

摘要

A spindle device of a machine tool capable of stably injecting atomized cutting fluid from the tip of a tool device (13) when a variation in fluidity of the atomized cutting fluid occurs temporarily in atomized cutting fluid passages (e1, e2) or the supply of the atomized cutting fluid into the atomized cutting fluid passage (e1) is stopped and re-started, wherein the atomized cutting fluid passages (e1, e2) having a single passage cross section are formed in the area ranging from the spindle (1) to the tip of the tool device (13) integrally installed thereon, the atomized cutting fluid supplied from the spindle (1) side is injected from the tip of the tool device (13) through the atomized cutting fluid passages (e1, e2), and a vacant chamber group transmission layer part (14) having a large number of vacant chambers (142) stacked thereon in multiple stages or in the state of communicating with each other and allowing the atomized cutting fluid to pass therethrough through the groups of the vacant chambers (142) is formed in the atomized cutting fluid passage (e1 or e2).