Abnormal load detection device, abnormal load detection method, and abnormal load detection program

An abnormal load detection method for detecting an abnormal load condition of an axis in a machine tool having at least one axis, comprising:

• a movement command generation step of generating a movement command of the axis on the basis of a machining program;
• a prediction load calculation step of calculating a prediction load applied to the axis on the basis of the machining program;
• a movement control step of controlling a movement of the axis on the basis of the movement command;
• an actual load calculation step of calculating an actual load actually applied to the axis on the basis of the movement command and movement control information used for a movement control of the axis;
• a differential calculating step of calculating a load prediction error that is a difference between the prediction load and the actual load;
• and
• an abnormal load detection step of detecting an abnormal load condition of the axis on the basis of the load prediction error.

A computer readable non-transitory tangible medium for storing an abnormal load detection program for detecting an abnormal load condition of an axis in a machine tool having at least one axis, the abnormal load detection program causing an arithmetic processing unit to execute:

• a movement command generation step of generating a movement command of the axis on the basis of a machining program;
• a prediction load calculation step of calculating a prediction load applied to the axis on the basis of the machining program;
• a movement control step of controlling a movement of the axis on the basis of the movement command;
• an actual load calculation step of calculating an actual load actually applied to the axis on the basis of the movement command and movement control information used for a movement control of the axis;
• a differential calculating step of calculating a load prediction error that is a difference between the prediction load and the actual load;
• and
• an abnormal load detection step of detecting an abnormal load condition of the axis on the basis of the load prediction error.