Tool management system of machine tool

A tool management system of a machine tool, comprising:

• a controller;
• at least two detection units among:
• a vibration sensor attached to a spindle that supports a tool of the machine tool to detect vibration;
• a sound sensor provided in the vicinity of the spindle to detect acoustic waves produced during operation of the machine tool;
• and
• a servo motor current value detection unit to detect a current value of a servo motor of a driving device of the machine tool;
• a tool replacement determination unit, to be executed by the controller, to determine the necessity to replace the tool when detection values of the at least two detection units exceed corresponding thresholds during operation of the machine tool;
• and
• a detection start/end command setting unit, to be executed by the controller, to add commands for a detection start point and a detection end point of at least one of the vibration, the acoustic waves, and the current value of the servo motor to a machining program, the detection start point being a machining start position and the detection end point being a machining end position,
• wherein the detection start/end command setting unit sends the commands for the detection start point and the detection end point to a control unit, and
• the control unit sets a measurement start flag to start the detection by the at least two detection units when the tool replacement determination unit is ready to acquire information from the control unit.