Fanuc Corporation

Susumu Maekawa

Hirohide Tsunoda

Takahiro Endou

Kunio Kojima

Masao Kamiguchi

Kuniharu Yasugi

Susumu Ito

Akihiko Fujimoto

Masanobu Takemoto

Zheng Tong

Yasuaki Koyama

Hisao Ishii

A machining system includes: a jig retaining a plurality of workpieces; a measurement device measuring the retained plurality of workpieces; and a machining device machining the retained plurality of workpieces. The jig has a reference part positioned or position detected by the machining device. The measurement device has: a measurement unit measuring a positional relationship of the retained plurality of workpieces relative to the reference part, and an input unit using a recording medium or communication to input measured positional information of the plurality of workpieces to the machining device. The machining device has: a jig coordinate system specifying unit specifying a coordinate system of the jig, by positioning or position measuring the reference part, and a workpiece coordinate system setting unit individually setting coordinate systems of each of the plurality of workpieces, based on the specified coordinate system, and the inputted positional information.

Machining system and machining method

To provide a temperature measuring device for a thermal displacement compensation device, in which the values output by temperature sensors are shared among a plurality of machine tools, and thus the total number of the temperature sensors is reduced, thereby suppressing the total cost and also reducing the failure risk of the temperature sensors installed in the machine tools. A plurality of machine tools are made to use, in order to monitor a temperature of each of one or more common positions set in advance, temperature information measured by a temperature sensor installed at any position in the common positions in each of the machine tools, as temperature information of any position in the common positions without a temperature sensor installed in another machine tool in the plurality of machine tools.

Temperature measuring device

Provided is a thermal displacement correction device capable of continuing a thermal displacement correction with high accuracy even when some of a plurality of sensors fail. The thermal displacement correction device includes a sensor information acquisition unit that acquires machine tool temperatures detected by the sensor and a state of the sensors, a thermal displacement estimating method storage unit that stores a plurality of thermal displacement estimating methods, a thermal displacement estimating method selection unit that selects a thermal displacement estimating method to be used for estimating the thermal displacement amount of the machine tool based on the state of the sensors, and a thermal displacement estimating unit that estimates the thermal displacement amount of the machine tool based on the machine tool temperature according to the thermal displacement estimating method selected by the thermal displacement estimating method selection unit.

Thermal displacement correction device considering sensor failure

To provide an abnormality determination apparatus, a computer readable medium, an abnormality determination system and an abnormality determination method which can simply detect an abnormality of a temperature in a machine tool without incurring cost. An abnormality determination apparatus which determines abnormality of a temperature sensor in a plurality of machine tools, in which the plurality of machine tools is equivalent machine type, is arranged in equivalent environments, are provided with a temperature sensor at equivalent positions, the abnormality determination apparatus including: a temperature data acquisition unit which acquires temperature data outputted by the temperature sensors from each of the plurality of machine tools; a comparison unit which compares the temperature data acquired by the temperature data acquisition unit; and an abnormality determination unit which determines abnormality of the temperature sensor based on a comparison result by the comparison unit.

Abnormality determination apparatus, non-transitory computer readable medium encoded with a program, abnormality determination system and abnormality determination method

To provide a reference temperature setting device, a reference temperature setting method, and a reference temperature setting program capable of setting an appropriate reference temperature for thermal displacement compensation. A reference temperature setting device comprises: an acquisition unit that acquires measured values from multiple temperature sensors installed on a machine; and a determination unit that determines setting timing for a reference temperature for thermal displacement compensation to coincide with a point in time when the measured values satisfy a predetermined condition.

Reference temperature setting device, reference temperature setting method, and reference temperature setting program

An abnormality determination apparatus, which determines abnormality of a temperature sensor in a machine tool, includes: a temperature pattern storage unit which stores a normal pattern indicating temperature change relative to machining time for a machining classification of the machine tool; a temperature data acquisition unit which acquires temperature data outputted by the temperature sensor provided to the machine tool; a machining classification determination unit which determines a machining classification of the machine tool; a comparison data acquisition unit which extracts the normal pattern relative to a determined machining classification from the temperature pattern storage unit; a comparison unit which compares the extracted normal pattern, and as acquired pattern indicating temperature change relative to machining time according to the acquired temperature data; and an abnormality determination unit which determines abnormality of a temperature sensor based on a comparison result.

A machine learning device that can optimize an equation for estimating a thermal displacement amount of a machine element based on the operating state of the machine element. The device acquires operating state data of the machine element, acquires a measured value for the thermal displacement amount, stores the operating state data and measured values for the thermal displacement amount of the machine element as training data associated together as a label, sets an equation for calculation the thermal displacement amount based on the operating state data, calculates an estimated value for the thermal displacement amount by substituting the operating state data into this equation, determines whether a difference between the estimated value for the thermal displacement amount and the measured value for the thermal displacement amount is no more than a predetermined threshold.

Machine learning device for machine tool and thermal displacement compensation device

A thermal displacement correction device for a machine tool that corrects thermal displacement of a spindle unit includes a memory that defines the spindle unit as a two-dimensional model in a thermally symmetrical plane or in a plane parallel to the thermally symmetrical plane, divides the two-dimensional model into regions, and stores a linear expansion coefficient, a heating coefficient and a radiation coefficient corresponding to each region, and a thermal conductivity coefficient between the each region and its adjacent region; a temperature estimating unit that estimates a temperature of the each region; a correction estimating unit; and a thermal displacement correction unit that performs correction in driving a feed shaft to a command position.

Thermal displacement correction device for machine tool

A thermal displacement correction device for a machine tool is provided with detection result determination unit configured to determine, based on an actual position and a reference position detected by position detection unit, whether or not the actual position is based on correct detection, correction error calculation unit configured to calculate a correction error in the actual position if it is determined that the result of detection is based on correct detection, and correction amount modification unit configured to modify a thermal displacement correction amount based on the correction error.

A position command value is compensated by predicting a thermal displacement amount of each part of a machine tool and adding a thermal displacement compensation amount which cancels the predicted thermal displacement amount to the position command value of a feed axis. This thermal displacement compensation amount is adjusted from the error amount between this compensated position command value and an actual machining point. Upon adjustment of this thermal displacement compensation amount, it is possible to determine whether to increase or decrease the thermal displacement amount based on a direction in which an operator moves a tool image or a workpiece image on a screen.

Thermal displacement compensating device of machine tool

A coolant apparatus of a machine tool includes a coolant pump that sends out a coolant from a coolant tank, a controller that drives or stops the coolant pump, and a condition setting unit that sets conditions for driving or stopping the coolant pump. Then, the controller drives or stops the coolant pump based on content set by the condition setting unit.

Machine tool including coolant apparatus

A thermal displacement compensating device calculates a thermal displacement amount which is produced by heat generation or dissipation as a machine tool is actuated or stopped and changes with time. A thermal displacement compensation amount is calculated by multiplying the calculated thermal displacement amount by a coefficient. A position command is compensated by adding the thermal displacement compensation amount to the position command. On the other hand, a variation between a thermal displacement amount calculated last time and a current thermal displacement amount is determined for each predetermined time. A plurality of thermal displacement amount change states are identified based on comparison between the determined variation and a predetermined threshold. The coefficient is calculated based on the identified thermal displacement amount change state.

Thermal displacement compensating device for machine tool

A controller () for a machine tool () for tapping by a main shaft and a feed shaft, comprising an identifier unit () for identifying an index of the size of the tap, a temperature detector unit () for detecting the temperature of a motor () for the main shaft, an acceleration storage unit () for storing the acceleration of the main shaft corresponding to the index of the size of the tap, a rate storage unit () for storing the rate of varying the acceleration of the main shaft depending upon the temperature of the motor, and an acceleration calculation unit () for calculating a new acceleration of the main shaft by multiplying an acceleration determined from the index of the size of the tap and from the acceleration storage unit by a rate determined from the detected temperature and from the rate storage unit.

Controller for a machine tool for executing tapping

In a thermal displacement compensation method for a machine tool, in which a feed shaft thermal displacement amount is obtained and an amount which cancels the obtained feed shaft thermal displacement amount is added as a thermal displacement compensation amount to a position command for a feed axis, a position where a signal is first output by a position sensor for detecting the position of a movable part of the machine tool is first stored as an initial position. Then, the position where the signal is output by the position sensor is detected, and the thermal displacement compensation amount is modified according to a compensation error, which is the difference between the detected position (actual position) and the initial position.

Thermal displacement compensation method and thermal displacement compensation device for machine tool

A machine tool capable of detecting an ambient temperature change without a detector for detecting the ambient temperature and capable of detecting an abnormality of a temperature detector for detecting the motor temperature. Motor temperature Ti (i=1, 2 . . . n) and the current feedback Ifi of each motor are read out from the temperature detector for detecting the temperature of each motor of the machine tool. The heating value Qi of each motor is obtained from current feedback Ifi. Motor temperature Ti is calculated and estimated from the heating value Q. Difference &#x394;Ti between the estimated motor temperature Tmi and the detected temperature Tsi is obtained. When difference between maximum and minimum values of difference &#x394;Ti exceeds the first threshold value &#x3b2;, a temperature detector abnormality is outputted. When it is equal to or less than the first threshold value &#x3b2;, the mean value &#x394;T' of differences is obtained. If the mean value &#x394;T&#x2032; is equal to or less than the second threshold value &#x3b3;, it is determined that there is no abnormality. If it is equal to or more than the second threshold value &#x3b3;, the indication that the ambient temperature has been changed is outputted.

Growing community of inventors

Yamanashi, Japan

Susumu Maekawa