Machining accuracy diagnosing device and machining accuracy management system for machine tool

A machining accuracy management system for a machine tool configured to machine a workpiece, the machining accuracy management system managing a machine accuracy of the machine tool installed inside a plant with an openable and closeable door or shutter, and a temperature regulating device, the temperature regulating device controlling a room temperature inside the plant or a temperature of the machine tool, the machining accuracy management system comprising:

• a machining accuracy diagnosing device comprising:
• a diagnosing information acquiring unit that acquires at least one of the room temperature inside the plant, a set temperature of the temperature regulating device, an air temperature outside the plant, a wind speed outside the plant, an opening degree of the door or the shutter, and a machine body temperature of the machine tool as information for diagnosis;
• an opening time setting unit that sets an opening time of the door or the shutter;
• a cutting time setting unit that sets a scheduled machining start time and a scheduled machining end time for machining of the workpiece by the machine tool;
• a machining accuracy influence amount predicting unit that predicts an influence amount of opening of the door or the shutter on the machining accuracy of the workpiece by the machine tool based on the acquired information for diagnosis, the set opening time of the door or the shutter, and the set scheduled machining start time and the set scheduled machining end time;
• an accuracy change acceptable value setting unit that sets an acceptable value of an accuracy change during the cutting time set by the cutting time setting unit;
• and
• a machining start available time computing unit that obtains a machining start available time that satisfies a condition in which the influence amount on the machining accuracy of the workpiece by the machine tool predicted by the machining accuracy influence amount predicting unit is smaller than the acceptable value of the accuracy change;
• and
• a machine tool controlling device,
• wherein the machine tool controlling device that controls the machine tool to stop machining or an on-machine measurement before the machining start available time and to start a machining or an on-machine measurement from the machining start available time onwards;
• and
• wherein the machining accuracy management system predicts an influence that opening the door or shutter has on the machining accuracy of the machine tool prior to machining the workpiece.