Controller, machine tool, calculation method, and non-transitory computer readable storage medium

A machine tool comprising:

• machining data collect circuitry configured to collect machining data including a date and a time when at least one machined portion of a workpiece has been machined by the machine tool, the at least one machined portion being set as a learning target;
• temperature circuitry configured to obtain, at predetermined time intervals, temperature data at a plurality of positions on the machine tool;
• dimension data input circuitry configured to receive dimension measurement data which includes a dimension of the at least one machined portion after the at least one machined portion has been machined;
• learning data generate circuitry configured to generate learning data based on the machining data and the dimension measurement data;
• and
• machine learning circuitry configured to execute a machine learning based on the temperature data and the learning data to obtain a correction coefficient based on which a displacement caused by a change in a temperature of the machine tool is corrected according to a thermal displacement correction equation.

A calculation method comprising:

• setting at least one machined portion of a workpiece as a learning target;
• collecting machining data including a date and a time when the at least one machined portion has been machined by a machine tool;
• obtaining, at predetermined time intervals, temperature data at a plurality of positions on the machine tool;
• receiving dimension measurement data which includes a dimension of the at least one machined portion after the at least one machined portion has been machined;
• generating learning data based on the machining data and the dimension measurement data;
• and
• executing a machine learning based on the temperature data and the learning data to obtain a correction coefficient based on which a displacement caused by a change in a temperature of the machine tool is corrected according to a thermal displacement correction equation.

A non-transitory computer readable storage medium retrievably storing a computer-executable program therein, the computer-executable program causing a computer to perform a calculation method, the calculation method comprising:

• setting at least one machined portion of a workpiece as a learning target;
• collecting machining data including a date and a time when the at least one machined portion has been machined by a machine tool;
• obtaining, at predetermined time intervals, temperature data at a plurality of positions on the machine tool;
• receiving dimension measurement data which includes a dimension of the at least one machined portion after the at least one machined portion has been machined;
• generating learning data based on the machining data and the dimension measurement data;
• and
• executing a machine learning based on the temperature data and the learning data to obtain a correction coefficient based on which a displacement caused by a change in a temperature of the machine tool is corrected according to a thermal displacement correction equation.