A numerical control device of a machine tool recognizes a failure of a vibration detection unit in a relatively short time to minimize damage to functions achieved using the vibration detection unit. A program interpreting unit interprets an automatic tool exchange operation, and a storage unit is instructed to store vibration information V(x) from the vibration detection unit. After the automatic tool exchange operation is finished, the storage unit is instructed to stop storage. When none of the vibration information V(x) stored in the storage unit exceeds a prescribed vibration level, a vibration information analysis unit determines abnormality of the vibration detection unit.

The object of the present invention is to provide a machining time estimation device for reducing the time required for estimating the machining time. The device comprises storage for storing machining program and machining setting, and machining information acquiring unit for acquiring machining information on an operating condition of a machine tool adapted to be controlled on the basis of the machining program and machining setting. The device further comprises varied element extraction unit for extracting an element varied between a plurality of said machining settings, effected block extraction unit for extracting an effected block the machining time is varied on the effect of the varied element, estimated reduction in time calculating unit for calculating on each effected block difference caused by the varied element and calculating estimated difference in time throughout the machining program, and machining time display unit for outputting the estimated difference in time.

A numerical controller performs PID control to control the move speed of an axis for driving a spindle such that a load value of the spindle becomes constant. When the spindle load value exceeds a threshold value, a speed calculation unit of the numerical controller calculates an override for the feed rate of the axis instructed by command data such that the load value of the spindle becomes constant, and, at the start of the speed calculation process, assigns the override just before the start of the speed calculation process to an initial value of an integral term or an offset for PID control.

Prediction of a machining time at higher accuracy considering a machine delay generated in a machine is allowed by a numerical controller of the invention. The numerical controller includes a reference machining time prediction unit for predicting a reference machining time corresponding to a machining time not considering a delay time of servo control and machine motion based on the machining program, a program analysis unit for extracting a combination of at least one program command included in the machining program, a data storage unit for storing information related to an actual delay time of servo control and machine motion measured for each combination of program command types, a correction time calculation unit for calculating a correction time for correction of the reference machining time based on the combination of the program commands extracted by the program analysis unit and the information stored in the data storage unit, and a machining time prediction unit for calculating a predicted machining time obtained by correcting the reference machining time using the correction time.

A numerical controller includes: a spindle load detection unit that detects time-series data on a load on a spindle when a workpiece is machined; a machining time setting unit that sets a machining time taken in machining the workpiece; a spindle load calculation unit that, based on the time-series data, calculates a load on the spindle applied when the workpiece is machined in the machining time set by the machining time setting unit and when a feed rate of the spindle is controlled so that the load on the spindle is a constant load; and a spindle load output unit that outputs data indicating the load on the spindle calculated by the spindle load calculation unit.

A display device acquires and displays path information of a feed axis of a machine tool that includes a spindle for relatively rotating a workpiece and a cutting tool and at least one feed axis for relatively feeding the workpiece and the cutting tool and that performs machining on the workpiece while making the cutting tool and the workpiece swing relatively, and includes a display unit and a selection unit, the display unit relatively highlights, in the path information, a selection path which includes the part selected by the selection unit and at least one of adjacent paths preceding and subsequent to the selection path with respect to the path of the path information other than the selection path and the adjacent paths and the selection path and the adjacent paths are paths corresponding to one revolution or a plurality of revolutions of the spindle.

To provide a numerical controller for facilitating mass production of various types of workpieces in comparison with a prior art, by controlling a rotary index machine or the like having a plurality of machining stations. A numerical controller for a machine tool executes multi-path control for collectively controlling a plurality of paths requiring conveyance operations between the processes when each of workpieces receives a plurality of processes. The numerical controller includes an execution unit for executing a plurality of machining programs each of which is generated for each of the workpieces so as to correspond to each of the paths, the plurality of machining programs including execution commands of the processes and conveyance commands between the processes.

A machine learning device included in a cutting fluid supply timing control device observes operating state data regarding an operating state of a cutting fluid supply device as a state variable representing a current environment state, acquires supply timing data indicating a timing of supplying a cutting fluid as label data, and then learns the operating state data and the supply timing data in association with each other by using these state variable and label data.

A controller has a function of stopping an oscillation motion in a non-cutting section in oscillation cutting and includes an oscillation command creation unit and an oscillation command creation determination unit. The oscillation command creation unit outputs an oscillation command, and the oscillation command creation determination unit determines whether or not cutting of a workpiece by a tool is actually being performed and stops an output of the oscillation command during non-cutting.

A numerical controller for correcting a deviation amount corresponding to a difference between a theoretical value and a measured value of a workpiece includes a machining unit for storing a machining path of the workpiece and an effective offset number during machining of the machining path in association with each other, a measurement unit for storing a deviation amount applied to the workpiece and a measurement point at which the deviation amount is detected in association with each other, and a correction unit for reflecting the deviation amount to the offset number corresponding to the machining path around the measurement point.