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Method and apparatus for monitoring the cutting condition of a machine tool during machining of a workpiece

  • US 4,736,625 A
  • Filed: 11/05/1986
  • Issued: 04/12/1988
  • Est. Priority Date: 11/05/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for monitoring the cutting condition of a cutting machine tool during machining of a workpiece, comprising:

  • first means (19) for sensing acoustic emissions resulting from the machining of said workpiece by said cutting tool;

    second means (20-36) coupled with said first means (19) for producing a first electrical signal which varies with changes in the sensed acoustic emissions;

    third means (42, 50, 52,

         54) responsive to said first electrical signal for producing a second electrical signal representing the energy rate of the sensed acoustic emissions;

    fourth means (40) responsive to said first electrical signal for producing a third electrical signal representing the RMS value of said first electrical signal;

    fifth means (15) for selecting one of said third and fourth electrical signals and for comparing the selected signal with a threshold value related to the cutting condition of said cutting tool; and

    ,sixth means (25) responsive to said fifth means (15) for providing an indication when the selected signal is in preselected relationship to said threshold value.

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