Anomaly detection device, machine tool, anomaly detection method, and program

A machine tool, comprising:

• a cutting tool configured to perform drilling,
• a first driving section configured to axially rotate the cutting tool,
• a second driving section configured to move the cutting tool in the Z-axis direction that is the axial direction of the cutting tool,
• a time series data acquisition section for acquiring target time series data that is the time series data of a moving load in the Z-axis direction of the cutting tool during the drilling process,
• an evaluation value derivation section for deriving an evaluation value indicating a degree of similarity between at least a part of the acquired target time series data and at least a part of reference time series data that is time series data of the moving load that can be regarded as normal using singular spectrum transformation, and
• an anomaly determination section for determining the presence or absence of an anomaly of the machine tool based on the derived evaluation value.

An anomaly detection method of a machine tool,

• the machine tool comprising:
• a cutting tool configured to perform drilling,
• a first driving section configured to axially rotate the cutting tool, and
• a second driving section configured to move the cutting tool in the Z-axis direction that is the axial direction of the cutting tool;
• and
• the anomaly detection method comprising:
• a time series data acquisition step of acquiring target time series data that is the time series data of a moving load in the Z-axis direction of the cutting tool during the drilling process,
• an evaluation value derivation step of deriving an evaluation value indicating a degree of similarity between at least a part of the acquired target time series data and at least a part of reference time series data that is time series data of the moving load that can be regarded as normal using singular spectrum transformation, and
• an anomaly determination step of determining the presence or absence of an anomaly of the machine tool based on the derived evaluation value.