Machining accuracy diagnosing device and machining accuracy diagnosing method for machine tool

A machining accuracy diagnosing device for a machine tool, the machining accuracy diagnosing device predicting and diagnosing an influence on a machining accuracy in a plant where the machine tool is installed when a machine body temperature of the machine tool is changed by a temperature regulating unit that affects the machine body temperature, the machining accuracy diagnosing device comprising:

• a temperature regulation operating pattern setting unit that sets an operating pattern of the temperature regulating unit;
• a cutting condition setting unit that sets at least a scheduled machining start time and a scheduled machining end time by the machine tool;
• a temperature information acquiring unit that acquires an influencing temperature of the temperature regulating unit on the machine body temperature and/or an air temperature outside the plant;
• and
• a machining accuracy influence amount predicting unit that predicts an influence amount of the temperature regulating unit on the machining accuracy based on the following three inputs
• (i) the operating pattern of the temperature regulating unit acquired from the temperature regulation operating pattern setting unit,
• (ii) the scheduled machining start time and the scheduled machining end time acquired from the cutting condition setting unit, and
• (iii) at least one of the influencing temperature and/or the air temperature outside the plant acquired from the temperature information acquiring unit and a set temperature of the temperature regulating unit acquired from the temperature regulation operating pattern setting unit.