Thermal displacement compensation device

Abstract

The thermal displacement correction device includes: a thermal displacement estimation unit that estimates the thermal displacement based on the changes in machine tool information over time; a correction activation unit that activates and deactivates thermal displacement correction to offset the aforementioned thermal displacement; an offset setting unit that sets the offset amount to the aforementioned thermal displacement at that time point when the thermal displacement correction is activated by the aforementioned correction activation unit; and a correction value calculation unit that calculates an applicable displacement amount by subtracting the aforementioned offset amount from the current aforementioned thermal displacement, and calculates a correction value to correct the instruction value to the aforementioned machine tool so as to offset the aforementioned applicable displacement amount.

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