| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of damaging a workpiece, because a tool bites into the workpiece when a power supply is cut off abruptly due to power interruption, or the like. SOLUTION: An uninterruptive power supply 5 outputs a power cut-off signal to a numerical control device 10. The numerical control device 10 outputs a movement command data for gradually reducing speed in each position on a predetermined relative movement locus, to a motor control device 20, and stops the output of movement command data, after a predetermined speed reducing time. The motor control device 20 synchronously performs drive control of feed motors 13, 15, 17, based on the movement command data and outputs stop signals respectively when the speed detected for every synchronous control shaft is 0. The numerical control device 10 outputs movement command data for lifting a movable body 16 of a main spindle when inputting all stop signals. The numerical control device 10 makes a braking device 4 operate, by outputting a brake signal after the movable body 16 of the main spindle stops. COPYRIGHT: (C)2008,JPO&INPIT
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