DAMPING DEVICE FOR MACHINE TOOL

PROBLEM TO BE SOLVED: To provide a damping device for a machine tool capable of satisfactorily suppressing vibrations while maintaining high responsiveness to vibrations of a workpiece and a cutting tool. SOLUTION: This damping device for machine tool comprises: a device body 2; a vibration part 3 relatively displaceable with respect to the device body 2; a drive device 4 for vibrating the vibration portion 3; a vibration detector 5 for detecting the acceleration of an object to be damped; and a control device 6 for controlling the drive device 4. The drive device 4 includes: a first and a second movable iron cores 21, 22 to be secured to the vibration portion 3; a first electromagnet 11 to be arranged at the first movable iron core 21 of the device body 2; a second electromagnet 12 to be arranged at the second movable iron core 22 of the device body 2; and a power supply device 18 for supplying power to the first and second electromagnets 11, 12. The control device 6 is constituted such that the operation of the power supply device 18 is controlled so that an attractive force, acting on a corresponding movable iron core, for the electromagnet oriented in the positive direction of the acceleration of the object to be damped which was detected by vibration detector 5, become larger than that for the other electromagnet thereof. COPYRIGHT: (C)2007,JPO&INPIT