Environmental temperature change prediction device and prediction method for machine tool

An environmental temperature change prediction device for a machine tool that predicts an environmental temperature change in a plant in which the machine tool is installed, the environmental temperature change prediction device comprising:

• an environmental temperature acquisition unit that measures at least of one of a machine body temperature at a part insusceptible to heat generation of a heat generator of the machine tool and a peripheral temperature with a temperature sensor and acquires the measured temperature as an environmental temperature;
• an outside temperature acquisition unit that acquires a temperature outside the plant as a plant outside temperature by at least of one of measurement with a temperature sensor and weather data;
• a plant environment pattern setting unit that defines in advance a classification rule for classifying change trends of the environmental temperature into a plurality of patterns based on data of the environmental temperature and the plant outside temperature and environmental temperature prediction models that differ for the respective patterns as plant environment patterns;
• a prediction model generating unit that selects the applicable plant environment pattern from the classification rule based on at least of one of the data of the environmental temperature and the plant outside temperature in a past and determines a parameter of the environmental temperature prediction model corresponding to the selected plant environment pattern;
• and
• an environmental temperature change prediction unit that predicts a change in the environmental temperature in a future by the environmental temperature prediction model generated in the prediction model generating unit.