Machine tool and method for compensating for thermal displacement of machine tool

Abstract

To perform more accurate thermal displacement compensation by taking into account the internal temperature of the aircraft's components. [Solution] A first temperature sensor MS is provided on the surface of the crossbeam 3, which is a Y-axis moving body, the base 4, which is an X-axis moving body, and the slider 6, which is a U-axis moving body, all of which are components of the machine. A second temperature sensor AS is provided on the frame 10F located between the cover 10 and the machine components. The control device calculates a first estimated temperature by correcting the temperature detected by the temperature sensors MS provided on each machine component with a predetermined first correction coefficient, and adds this to a second estimated temperature obtained by correcting the temperature detected by the temperature sensor AS with a predetermined second correction coefficient to obtain the combined temperature of each machine component. Based on the combined temperature, the control device calculates the amount of thermal displacement of the machine in a predetermined direction and performs thermal displacement correction in that predetermined direction.

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