Machine tool control device and machine tool equipped with said control device

A control apparatus of a machine tool, the control apparatus being provided in a machine tool that includes:

• a cutting tool configured to cut a workpiece;
• rotating means configured to rotate the cutting tool and the workpiece relative to each other;
• feeding means configured to feed the cutting tool and the workpiece in a predetermined feeding direction;
• and
• vibration means configured to cause relative reciprocating vibration between the cutting tool and the workpiece in the feeding direction such that a cut portion during a forward movement overlaps with a cut portion during a backward movement;
• the control apparatus comprising control means configured to cause the machine tool to machine the workpiece by relative rotation between the cutting tool and the workpiece and by feed movement of the cutting tool toward the workpiece with reciprocating vibration thereof;
• wherein the control means is configured to set the number of rotations of the relative rotation and the number of vibrations of the reciprocating vibration during one rotation of the relative rotation in a relation where the number of rotations and the number of vibrations are inversely related to each other with a constant being a vibration frequency at which the reciprocating vibration can be performed based on a cycle during which an operation instruction by which the feeding means are controlled to be driven can be issued;
• and
• wherein the control means includes adjusting means configured to adjust the number of rotations and the number of vibrations set by the control means while maintaining the vibration frequency within a range where overlapping of the cut portion during the forward movement with the cut portion during the backward movement is maintained.