| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a machine tool and a tool replacement method which can avoid the action of excessive load on a motor rotating a main shaft and the like even when tool replacement is executed in a state where a non-rotating tool is mounted on the main shaft.SOLUTION: In the machine tool, a subtractor 92 calculates a value corresponding to a difference between a target position and a current position of a main shaft around an axis, and an accumulator 93 calculates a cumulative value of the difference value. The machine tool controls rotation of the main shaft by switching between rotational control of a main shaft motor based on both of the difference value calculated by the subtractor 92 and the cumulative value calculated by the accumulator 93 and rotational control of the main shaft motor based on the difference value without the cumulative value. The machine tool controls rotation of the main shaft motor based on the difference value and the cumulative value from a processing position to a switching position and controls rotation of the main shaft motor based on the difference value from the switching position to a replacement position.</p> |
