Abnormality determination apparatus, non-transitory computer readable medium encoded with a program, abnormality determination system and abnormality determination method

An abnormality determination apparatus which determines abnormality of a temperature sensor in a machine tool, the abnormality determination apparatus comprising:

• a temperature pattern storage unit which stores a normal pattern indicating temperature change relative to machining time for a machining classification of the machine tool;
• a temperature data acquisition unit which acquires temperature data outputted by the temperature sensor provided to the machine tool;
• a machining classification determination unit which determines a machining classification of the machine tool;
• a comparison data acquisition unit which extracts the normal pattern relative to a machining classification determined by the machining classification determination unit from the temperature pattern storage unit;
• a comparison unit which compares the normal pattern extracted by the comparison data acquisition unit, acid an acquired pattern indicating temperature change relative to machining time according to the temperature data acquired by the temperature data acquisition unit;
• and
• an abnormality determination unit which determines abnormality of a temperature sensor based on a comparison result by the comparison unit.