Thermal displacement compensation device

Abstract

A thermal displacement correction device is a device that calculates the displacement amount to compensate for the relative position of the tool and the workpiece, thereby offsetting the thermal displacement of a machine tool that processes the workpiece by means of the aforementioned tool. It comprises: a mode discrimination unit that distinguishes between a high-quality mode prioritizing the quality of the machined surface and a high-precision mode prioritizing machining error; a start point determination unit that determines at least one start point indicating the position and time at which the aforementioned tool begins to contact the aforementioned workpiece; a thermal displacement estimation unit that estimates the thermal displacement of the aforementioned machine tool; and a displacement amount determination unit that, in the case of the aforementioned high-quality mode, sets the aforementioned displacement amount to a certain value calculated in a manner that can offset the thermal displacement estimated at the aforementioned start point, and in the case of the aforementioned high-precision mode, sets the aforementioned displacement amount to a value calculated sequentially in a manner that can offset the thermal displacement estimated at the current time point.

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