| 摘要 |
A machine tool 1 comprises a spindle head 11 for supporting a spindle 9 to which a tool 7 is fitted, a column 5 for supporting the spindle head 11 and a table 13 for mounting a workpiece 15, and machines the workpiece 15 by relatively moving the tool and the workpiece. A cavity 5a is defined in the column so that a liquid can be circulated. A liquid pump 19 is provided for circulating the liquid into the cavity 5a. A circulating pump controller 27 is provided for controlling the circulation of the liquid by activating and deactivating the liquid pump 19. By circulating the liquid into the cavity 5a of the column 5, the temperature of each part of the column 5 is evenly maintained to prevent the thermal deformation of the column 5.
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