| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a deterioration in machining accuracy and to prevent a main shaft and a tool from interfering with a workpiece by suppressing heat generation of a vertical shaft driving source when stopping the driving of a machine tool and performing control for energy saving. Ž<P>SOLUTION: A control device 20 performing control for energy saving of the machine tool holds the main shaft by a reference point moving means 23, at an original point being a reference point position within an effective range preset in three axial directions of an X-axis, Y-axis and Z-axis when the machine tool stops, and holds the main shaft at a position where the main shaft does not interfere with the workpiece in an X-axial or Z-axial direction. After a timer 24 measures a set time to start an energy saving mode, a Y-axis driving source stopping means 21y interrupts electricity supply to a Y-axis servo motor My and operates a brake device 13. A position monitoring means 25 detects a positional deviation amount of the main shaft in a Y-axial direction, and a discriminating means 31 discriminates whether the detected positional deviation amount from the reference point position of the main shaft is within an effective range. When the positional deviation amount is outside the effective range, a releasing means 32 releases the energy saving mode. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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