US 2026/0219645 A1Published application

Machine tool and thermal displacement correction method for machine tool

AssigneeSodick Co., Ltd.

InventorsNishiki MIYAHARA, Asuma NARISHIMA, Yoshinobu YAMAMOTO

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Abstract

First temperature sensors MS are respectively provided on surfaces of a Y-axis moving body, an X-axis moving body, and a U-axis moving body that are machine body components. A second temperature sensor AS is provided on a frame 10F located between a cover 10 and the machine body components. A first estimated temperature is calculated by correcting a detection temperature of the temperature sensor MS with a predetermined first correction coefficient, a second estimated temperature is calculated by correcting a detection temperature of the temperature sensor AS with a predetermined second correction coefficient. The second estimated temperature is added to obtain a synthesis temperature of each machine body component. A thermal displacement amount in a predetermined direction of the machine body is calculated based on the synthesis temperature, and thermal displacement correction in the predetermined direction is performed.

Claims12

Dependent claims

A machine tool, comprising:

a first temperature sensor, provided on a surface of each of one or more machine body components selected for forming a machine body;
and
at least one second temperature sensor, provided in a non-contact manner with respect to each of the machine body components at a position opposing positions of all of the first temperature sensors, and detecting an ambient temperature around the machine body component;
and
a control device, comprising a first computing device and a second computing device and performing thermal displacement correction of the machine body in a predetermined direction, wherein the first computing device is configured to calculate, for each of the one or more machine body components, a first estimated temperature by correcting a detection temperature of the first temperature sensor by using a predetermined first correction coefficient and calculate a second estimated temperature by correcting a detection temperature of the second temperature sensor by using a predetermined second correction coefficient, and obtain a synthesis temperature of the machine body component by adding the second estimated temperature to the first estimated temperature, and the second computing device is configured to calculate the thermal displacement amount of the machine body in the predetermined direction based on the synthesis temperature obtained by the first computing device.

2 more elements

A thermal displacement method for a machine tool, the thermal displacement method comprising steps as follows:

calculating a first estimated temperature by correcting a detection temperature of a first temperature sensor provided on a surface of each of one or more machine body components forming a machine body by using a predetermined first correction coefficient;
calculating a second estimated temperature by correcting a detection temperature of at least one second temperature sensor by using a predetermined second correction coefficient, wherein the at least one second temperature sensor is provided in a non-contact manner with respect to each of the machine body components at a position opposing positions of all of the first temperature sensors and detecting an ambient temperature around the machine body component;
calculating a synthesis temperature of the machine body component by adding the second estimated temperature to the first estimated temperature;
calculating a thermal displacement amount of the machine body in a predetermined direction based on the calculated synthesis temperature;
and
performing thermal displacement correction of the machine body in the predetermined direction based on the calculated thermal displacement amount in the predetermined direction.

3 more elements

Dependencies are inferred from the claim text.