Diagnostic apparatus, machining system, diagnostic method, and recording medium

A machining system comprising:

• a machine configured to perform at least one machining operation on a workpiece using a tool attached to a spindle of the machine, the machine including a transmitter configured to transmit context information defining an operation of the tool attached to the spindle of the machine, rotation information of the spindle, tool information identifying the tool, and a detection result of a time-varying physical quantity, the time-varying physical quantity being generated by the tool during the at least one machining operation;
• and
• a diagnostic apparatus, the diagnostic apparatus configured to,
• receive the context information, the rotation information, the tool information, and the detection result,
• determine a frequency analysis result by performing frequency analysis on the detection result,
• set a frequency range,
• set a bandwidth of a frequency band to be noted in the frequency range,
• set a band pass filter using a plurality of center frequencies and the bandwidth, the plurality of center frequencies being set using the rotation information, the tool information, and the frequency range,
• extract feature information from the detection result using the band pass filter and the frequency analysis result, and
• determine a machining state of the machine using the feature information.

A method for diagnosing a machining state of a machine, the method comprising:

• receiving context information defining an operation of a tool attached to a spindle of the machine, rotation information of the spindle, tool information identifying the tool, and a detection result of a time-varying physical quantity, the time-varying physical quantity being generated by the tool during at least one machining operation performed by the machine on a workpiece;
• determining a frequency analysis result by performing frequency analysis on the detection result;
• setting a frequency range;
• setting a bandwidth of a frequency band to be noted in the frequency range;
• setting a band pass filter using a plurality of center frequencies and the bandwidth, the plurality of center frequencies being set using the rotation information, the tool information, and the frequency range;
• extracting feature information from the detection result using the band pass filter and the frequency analysis result;
• and
• determining the machining state of the machine using the feature information.