To provide a magnetic bearing device for a machine tool allowing automatic sensing of chattering vibrations and enhancement of the working effectiveness.
The magnetic bearing device for the machine tool is configured so that the spindle 1 is magnetically levitated from the stationary side by magnetic bearing means 2a, 2b and 5a and magnetic thrust bearing means 4a and 4b and rotated by a motor 7 and a work 9 is processed using a tool 8 attached to the spindle end, wherein the arrangement includes a vibration sensing means 5a to sense the vibrations of the spindle 1 and judging means 10a, 10b and 11 to extract the bending natural frequency component of the spindle 1 by processing the output signal from the vibration sensing means 5a and judge a chattering condition in processing if the level of the extracted vibration component has exceeded the specified level.
NAKADA HIROYUKI
TASHIRO ISAO
Next Patent: MAGNETIC BEARING DEVICE FOR MACHINE TOOL