HEADSTOCK COOLING DEVICE OF MACHINE TOOL

PROBLEM TO BE SOLVED: To provide an air cooling type headstock cooling device capable of increasing the working accuracy of a work by increasing a cooling capacity, and reducing the thermal displacement of a machine tool. SOLUTION: This headstock cooling device for a machine tool comprises a splash guard covering a working area, a headstock 4 rotatably supporting a spindle 5, having heating elements 81 and 82 installed therein, and also having headstock side suction ports 42 and 43 and a headstock side exhaust port 41 provided therein, suction ducts 2 and 3 sucking air from the outside of the splash guard to the headstock side suction port, an exhaust duct 1 for exhausting air from the headstock side exhaust port to the outside of the splash guard, a cooling passage 44 formed in the outer peripheral part of the heating elements inside the headstock and circulating air therethrough, and a blower installed near the exhaust port of the exhaust duct and exhausting air through the exhaust duct. The headstock side suction port, headstock side exhaust port, and cooling passage are provided so as to be thermally symmetrical with respect to the direction where the effect of the thermal displacement on the working accuracy appears remarkably.