| 摘要 |
A machine tool includes a main axis 30 to which a touch probe 17 is attached, a motor 15 that rotationally drives the main axis 30, a rotation angle position detector 16 that detects a rotation angle position of the motor 15, and a control device 20. The control device, when a measurement mode command for performing measurement of a workpiece by the touch probe 17 is input, multiplies a d-axis current command value Idc by a d-axis current correction coefficient K that is less than 1 to reduce the d-axis current command value Idc to a d-axis current command correction value Idc′, using a d-axis current command correction section 4. Thus, in the machine tool, small rotation vibrations of the main axis, generated when rotating the main axis to which the probe is attached and performing measurements of a workpiece, can be suppressed to thereby increase the measurement accuracy. |
| 主权项 |
1. A machine tool, comprising:
a main axis to which a probe is attached, the probe configured to measure a position or dimension of a tool for maintaining a workpiece or a position or dimension of a workpiece; a motor that rotationally drives the main axis; a rotation angle position detector that detects a rotation angle position of the motor; and a control device that adjusts electric power to be supplied to the motor based on the rotation angle position of the motor that is detected by the rotation angle position detector, wherein the control device includes a switching unit that, when a measurement mode command for performing measurement of the workpiece position or dimension by the probe is input, switches a variation ratio of the electric power to be supplied to the motor in accordance with an output variation ratio of the rotation angle position detector from a normal variation ratio used for workpiece machining to a measurement mode variation ratio. |
