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, and an acquired pattern indicating temperature change relative to machining time according to the temperature data acquired by the temperature data acquisition unit;
• an abnormality determination unit which determines abnormality of a temperature sensor based on a comparison result by the comparison unit;
• and
• a pattern update unit which causes the acquired pattern to be stored in the temperature pattern storage unit to be associated with the machining classification as the normal pattern, in a case of the comparison data acquisition unit not being able to extract the normal pattern related to the machining classification determined by the machining classification determination unit.

An abnormality determination method of a temperature sensor in a machine tool, the method comprising:

• determining whether a temperature sensor is abnormal by way of a computer, which is provided with a temperature pattern storage unit that stores at least one normal pattern indicating temperature change relative to machining time since a machining start time for every machining classification of the machine tool;
• determining a machining classification of the machine tool in accordance with a predetermined determination criterion set in advance;
• and
• comparing an acquired pattern indicating temperature change relative to machining time according to temperature data since the machining start time outputted by the temperature sensor provided to the machine tool, and the at least one normal pattern related to the machining classification thus determined, stored in the temperature pattern storage unit.