| 摘要 |
A numerical controller capable of reducing machining time in synchronization control machining. A workpiece already rough-machined into a shape of a gear and a tool are rotated in synchronism. Proximity limit distance Lt ensuring that the workpiece and the tool do not interfere with each other, approach amount Ap required to bring the workpiece and the tool into a positional relationship for performing normal gear machining (condition in which the workpiece engages with the tool), and phase shift amount corresponding to the depth of cut are given as commands. In parallel with approach motion, phase adjustment motion for making the workpiece face a tooth space of the tool is performed. When the approach motion progresses by the proximity limit distance Lt, if the phase adjustment is completed, the approach motion is continued without interruption. If not, the approach motion is interrupted, and resumed after the phase adjustment is completed. After the approach motion is completed, phase shift is performed to give a cut, and machining is performed. When cutting loads become a certain value or smaller, it is determined that the machining is completed. Since the approach motion and the phase adjustment are performed concurrently and completion of machining is automatically determined, the machining time can be reduced.
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