CUTTING LIQUID SUPPLY DEVICE FOR MACHINE TOOL

摘要

A cutting liquid supply device is configured in such a manner that gas mixed in a cutting liquid supply line is removed to improve the response until mist is discharged. A machine tool (1) is configured in such a manner that a cutting liquid is supplied from a pump (42) through a rotary joint (28) to a mist generation device (24) within the rotating spindle (29). The pressure of the cutting liquid supplied from the pump (42) is measured by a pressure sensor (47). An air vent device (30) for opening and closing piping (3), which supplies the cutting liquid, to the atmospheric pressure is provided at a position above the rotary joint (28). A detection signal is inputted in the control board (70) from the pressure sensor (47), and when the control board (70) detects, after the pump (42) stops the supply of the cutting liquid to the piping (3), that the pressure of the cutting liquid does not decreases to a level lower than a predetermined threshold value, the control board (70) instructs the air vent device (30) to open the piping (4) to the atmosphere.