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A tool monitoring system for detecting a tool failure of a tool employed in a tool machine, comprising artificial signal generating unit for generating a predetermined artificial tool failure signal simulating the acoustic emission signal obtained in an actual failure of the tool, acoustic emission

A tool monitoring system for detecting a tool failure of a tool employed in a tool machine, comprising artificial signal generating unit for generating a predetermined artificial tool failure signal simulating the acoustic emission signal obtained in an actual failure of the tool, acoustic emission transducing unit adapted to be mounted on the tool machine near the tool and driven by the artificial signal generating unit for applying the artificial tool failure signal to the tool machine, acoustic emission sensing unit mounted on the tool machine near the tool so as to receive, in a setting mode of the system where the transducing unit is mounted on the machine, the applied artificial tool failure signal from the acoustic emission transducing unit through the tool machine and, in a monitoring mode of the system where the tool is operated, an acoustic emission from the tool, and signal processing unit for analyzing an output signal generated from the acoustic emission sensing unit to detect the tool failure of the tool.

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A tool monitoring system for detecting a failure of a tool employed in a tool machine, comprising artificial signal generating means for generating a predetermined artificial tool failure signal simulating the acoustic emission signal obtained in an actual failure of the tool, acoustic emission tran

A tool monitoring system for detecting a failure of a tool employed in a tool machine, comprising artificial signal generating means for generating a predetermined artificial tool failure signal simulating the acoustic emission signal obtained in an actual failure of the tool, acoustic emission transducing means adapted to be mounted at least temporarily during a setting mode on the tool machine near the tool and driven by said artificial signal generating means for applying said artificial tool failure signal to the tool machine, acoustic emission sensing means mounted on the tool machine near the tool so as to receive, in a setting mode of said system where said transducing means is mounted on the machine, said applied artificial tool failure signal form said acoustic emission transducing means through the tool machine and to receive in a monitoring mode of said system where the tool is operated, an actual tool failure signal if said tool fails, said acoustic emission sensing means converting said artificial signal or an actual tool failure signal into an electrical signal; and signal processing means responsive to the electrical signal generated by said acoustic emission sensing means and, in said setting mode of said system, for adjusting a characteristic of said electrical signal for later detection of a tool failure signal, said signal processing means being responsive to said electrical signal generated by said acoustic emissions sensing means, in a monitoring mode of said system, for detecting a failure of said tool, said signal processing means comprising: amplying means for adjusting in said setting mode a magnitude of said electrical signal fed from said acoustic emission sensing means to an optimum level reflecting a position of said acoustic emission transducing means; storage means for storing an optimum amplification degree of said amplifying means at which a magnitude of said electrical signal is adjusted to said optimum magnitude; setting means for, in said monitoring mode of said system where said tool is operated, setting an amplification degree of said amplifying means to said optimum amplification degree stored in said storage means; and means responsive to an output of the amplifying means during said monitoring mode for determining the existence of a tool failure.