A machine tool is configured so that: a first frequency band comprising the main shaft characteristic vibration frequency and a second frequency band comprising the mechanical structure characteristic vibration frequency are set; thresholds are stored for each of the set frequency bands; vibration components are extracted for each of the frequency bands from the output of a vibration sensor; and when the vibration amplitude exceeds a threshold in either of the frequency bands, an alarm is sounded.

A machine tool is configured so that: a first frequency band comprising the main shaft characteristic vibration frequency and a second frequency band comprising the mechanical structure characteristic vibration frequency are set; thresholds are stored for each of the set frequency bands; vibration components are extracted for each of the frequency bands from the output of a vibration sensor; and when the vibration amplitude exceeds a threshold in either of the frequency bands, an alarm is sounded.

The present disclosure relates to a system for measuring a dynamic response of a machine. The system includes a vibration mechanism, an accelerometer, a controller and a casing. The vibration mechanism is operable to generate an excitation signal, and the accelerometer is operable to measure dynamic energy in response to the excitation signal and output a dynamic response signal indicative of the dynamic energy. The controller includes a communication interface and operates the vibration mechanism to output the excitation signal and transmit a vibration input signal based on the excitation signal by way of the communication interface. The casing houses the vibration mechanism and the controller.

The present disclosure relates to a system for measuring a dynamic response of a machine. The system includes a vibration mechanism, an accelerometer, a controller and a casing. The vibration mechanism is operable to generate an excitation signal, and the accelerometer is operable to measure dynamic energy in response to the excitation signal and output a dynamic response signal indicative of the dynamic energy. The controller includes a communication interface and operates the vibration mechanism to output the excitation signal and transmit a vibration input signal based on the excitation signal by way of the communication interface. The casing houses the vibration mechanism and the controller.

A learning device includes an input processor and a learning processor. The input processor acquires a physical quantity related to a cutting process, and inputs a state variable based on the physical quantity to the learning processor, and the learning processor updates, based on a measured cutting result, an evaluation model that outputs an evaluation result of the cutting process based on the state variable.

A learning device includes an input processor and a learning processor. The input processor acquires a physical quantity related to a cutting process, and inputs a state variable based on the physical quantity to the learning processor, and the learning processor updates, based on a measured cutting result, an evaluation model that outputs an evaluation result of the cutting process based on the state variable.

A machine tool includes: a cutting tool; rotating means; feeding means; vibrating means for reciprocatingly vibrating the cutting tool and the workpiece relative to each another; and amplitude control means for controlling the amplitude of the reciprocating vibration by the vibrating means. The cutting process is carried out by rotation of the workpiece and the cutting tool relative to each other and feeding of the cutting tool accompanied by the reciprocating vibration with said amplitude in the machining feeding direction of the cutting tool, to thereby move the cutting tool along a predetermined movement path relative to the workpiece. The movement path comprises a plurality of divisional paths divided at predetermined coordinate positions on the movement path. The amplitude control means is adapted to set the amplitude individually for each of the divisional paths.

A machine tool includes: a cutting tool; rotating means; feeding means; vibrating means for reciprocatingly vibrating the cutting tool and the workpiece relative to each another; and amplitude control means for controlling the amplitude of the reciprocating vibration by the vibrating means. The cutting process is carried out by rotation of the workpiece and the cutting tool relative to each other and feeding of the cutting tool accompanied by the reciprocating vibration with said amplitude in the machining feeding direction of the cutting tool, to thereby move the cutting tool along a predetermined movement path relative to the workpiece. The movement path comprises a plurality of divisional paths divided at predetermined coordinate positions on the movement path. The amplitude control means is adapted to set the amplitude individually for each of the divisional paths.

A cutting processing apparatus includes a cutting tool, a chuck portion, a feed mechanism, a fixing portion that fixes the cutting object, a stage that moves the fixing portion at a processing speed in a direction substantially orthogonal to a rotation axis of the chuck portion, a sensor that is arranged in the vicinity of a position on the fixing portion at which the cutting object is fixed, detects vibration of the cutting tool during cutting processing of the cutting object, and outputs a monitoring signal, and a control circuit that converts time waveform data of the monitoring signal to frequency waveform data and extracts an impact amount during cutting processing of the cutting object from the frequency waveform data.

A cutting processing apparatus includes a cutting tool, a chuck portion, a feed mechanism, a fixing portion that fixes the cutting object, a stage that moves the fixing portion at a processing speed in a direction substantially orthogonal to a rotation axis of the chuck portion, a sensor that is arranged in the vicinity of a position on the fixing portion at which the cutting object is fixed, detects vibration of the cutting tool during cutting processing of the cutting object, and outputs a monitoring signal, and a control circuit that converts time waveform data of the monitoring signal to frequency waveform data and extracts an impact amount during cutting processing of the cutting object from the frequency waveform data.