A numerical control device according to an aspect of the present disclosure includes: a reference speed calculation unit configured to calculate a spindle speed which is a rotation number of the spindle in accordance with a machining program, and a feed speed which is a movement speed of the feed axis in accordance with the machining program; an oscillation command calculation unit configured to calculate an oscillation command, which is a periodic variation component superimposed on a command of the feed axis, based on the spindle speed and the feed speed, as well as an oscillation frequency magnification set in advance; a setting acquisition unit configured to acquire an upper limit value for frequency of the oscillation command; and an adjustment unit configured to adjust the frequency of the oscillation command, or adjust at least either of the spindle speed and the oscillation frequency magnification, so that the frequency of the oscillation command does not exceed the upper limit value.

To provide a controller for a machine tool that can shred shavings in a sure manner, even if a delay in notification occurs at the time of performing oscillation cutting. This controller of machine tools controls the machine tools that perform cutting working of a work by a cutting tool with a spindle and a feed axis operating cooperatively. The controller includes: an oscillation command calculating unit that calculates an oscillation command to cause relative oscillation of the cutting tool and the work, from a rotation speed of the spindle and a positional command of the cutting tool as to the work; a correction amount calculating unit that calculates a correction amount corresponding to an amount of delay notification to the oscillation command calculating unit regarding the rotation speed of the spindle; and a correction amount superimposing unit that superimposes the correction amount on the oscillation command.

A machining operation generating unit analyzes a program in accordance with a machining program stored in the storage unit and causes the machine tool to perform a normal machining operation. A chip removal operation generating unit outputs an instruction for rotating a main shaft in the reverse direction to the interpolation unit after a cutting machining performed by the machine tool ends. The chip removal operation generating unit rotates the main shaft in the reverse direction for a predetermined time.

Provided is a machine tool control device capable of promptly determining a frequency parameter and an amplitude parameter for a desired oscillation instruction enabling shredding of a chip. A machine tool control device 1 performs machining while causing a tool T and a workpiece W to oscillate relative to each other. The machine tool control device 1 is provided with an oscillation instruction calculation unit 113 that calculates an instruction for an oscillating operation; a first oscillation condition determination unit 111 that determines, as a first oscillation condition, one of a frequency parameter constituted of a frequency or a frequency multiplying factor of the oscillation instruction, and an amplitude parameter constituted of an amplitude or an amplitude multiplying factor of the oscillation instruction; and a second oscillation condition calculation unit 112 that calculates, as a second oscillation condition, the other of the frequency parameter and the amplitude parameter on the basis of the first oscillation condition determined by the first oscillation condition determination unit 111.

Provided is a machine tool control device that can realize a desired scrap length while suppressing deterioration in machining accuracy. This control device 1 is for a machine tool which performs machining while causing a tool and a workpiece to oscillate relative to each other, the control device 1 being provided with: an oscillation command generation unit 13 for generating an oscillation command on the basis of an oscillation condition; an oscillation command correction unit 14 for correcting the oscillation command so that main-axis phases in given oscillation phases are not identical to each other; and a position/speed control unit 18 for causing the tool and the workpiece to oscillate relative to each other on the basis of a superposition command generated by superposing the oscillation command corrected by the oscillation command correction unit 14 on a movement command.

A control device for a machine tool and a machine tool, for which settings of the number of vibrations per rotation become easy, is provided. The control device of the machine tool controls a relative rotation between a workpiece and a cutting tool and a relative reciprocal movement between the workpiece and the cutting tool in a feed direction to perform vibration cutting to the workpiece. The control device includes a control section for controlling a spindle headstock, a first tool post, and a second tool post, the workpiece W being installed on the spindle headstock, the first tool post being provided to be reciprocally movable along the feed direction with respect to the spindle headstock and installed with a first cutting tool for cutting the workpiece, and the second tool post being provided to be reciprocally movable along the feed direction with respect to the spindle headstock independently of the first tool post and installed with a second cutting tool for cutting the workpiece.

A controller including: a positional deviation calculating unit that calculates positional deviation using a position command directed to a servo motor for driving a cutting tool, etc., and a position feedback value corresponding to the position of the cutting tool, etc.; an oscillation command calculating unit that calculates an oscillation command using the position command and a spindle axis angle of the rotated work, etc., or using the position feedback value and the spindle axis angle; an oscillation offset calculating unit that calculates an offset for the oscillation command using the positional deviation, the oscillation command, and the spindle axis angle; and a driving unit that determines a drive signal for the servo motor based on the positional deviation, the oscillation command, and the oscillation offset, and outputs the drive signal.

In a machine tool and a control apparatus thereof, a repetitive movement unit is configured so that the cutting tool performs one repetitive movement with respect to multiple relative rotations between the workpiece and the cutting tool and so that a rotation angle of the relative rotation between the workpiece and the cutting tool during relative movement at a second speed is smaller than a rotation angle of the relative rotation during relative movement at a first speed in one repetitive movement. This configuration limits degradation of machining efficiency when the cutting tool machines the workpiece by performing one repetitive movement with respect to multiple relative rotations between the workpiece and the cutting tool.

A numerical control device includes—a screen processing unit that divides a waveform of a commanded oscillatory movement quantity specified by a vibration cutting command and a waveform of an actual position detected by detectors, into sections each corresponding to a unit time, and this screen processing unit displays, on a display unit, an n-th commanded oscillation waveform, which is an n-th waveform of the commanded oscillatory movement quantity; an (n+1)-th commanded oscillation waveform, which is an (n+1)-th waveform of the commanded oscillatory movement quantity; an n-th actual position waveform, which is an n-th waveform of the actual position; and an (n+1)-th actual position waveform, which is an (n+1)-th waveform of the actual position, being superimposed on one another along a time axis, where n is a natural number.

A controller of a machine tool includes: a position command calculation unit which calculates a position command for relatively moving a workpiece and a tool; an oscillation operation execution determination unit which analyzes a machining program and which determines whether or not an oscillation operation of relatively oscillating the workpiece and the tool is performed in a machining block; an oscillation operation intermittent execution determination unit which determines, when it is determined that the oscillation operation is performed, in the machining block, based on the state of the machine tool, whether the oscillation operation is enabled or disabled so as to determine whether or not the oscillation operation is intermittently performed; an oscillation command calculation unit which calculates, when it is determined that the oscillation operation is enabled, an oscillation command for relatively oscillating the workpiece and the tool; and an adder which adds the position command and the oscillation command together.