Machining machine system which determines acceptance/rejection of workpieces

A machining machine system comprising:

• a machining machine machines a workpiece by driving an axis by at least one motor;
• a numerical control device which generates a command for driving the axis of the machining machine based on a machining program;
• an interior information acquisition unit which acquires interior information of the numerical control device;
• a tentative determination unit which determines acceptance/rejection of a workpiece as machined by the machining machine based on a comparison result between the interior information acquired by the interior information acquisition unit and a threshold value;
• a final determination unit which determines acceptance/rejection of workpieces which are targets of an accuracy inspection which include at least a workpiece as determined to be accepted/rejected by the tentative determination unit based on a measurement result with respect to an accuracy of the workpiece;
• and
• a threshold value update unit which updates the threshold value used for determination processing by the tentative determination unit based on a determination result by the tentative determination unit and a determination result by the final determination unit,
• wherein the threshold value update unit sets:
• a value obtained by multiplying the threshold value as already set by a first coefficient smaller than one and larger than zero is set as the new threshold value when a determination of acceptance is made by the tentative determination unit and all the workpieces which are targets of an accuracy inspection are determined to be accepted by the final determination unit;
• a value obtained by multiplying the threshold value as already set by a second coefficient smaller than the first coefficient and larger than zero is set as the new threshold value when a determination of acceptance is made by the tentative determination unit and the workpieces which are targets of an accuracy inspection contain that as rejected by the final determination unit;
• a value obtained by multiplying the threshold value as already set by a third coefficient larger than one is set as the new threshold value when a determination of rejection is made by the tentative determination unit and the workpieces which are targets of an accuracy inspection contain that as accepted by the final determination unit;
• and
• the threshold value as already set is maintained when a determination of rejection is made by the tentative determination unit and all the workpieces which are targets of an accuracy inspection are determined to be rejected by the final determination unit.