Acoustic detection of tool wear and fracture
Patent 4332161 Issued on June 1, 1982. Estimated Expiration Date: 
January 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3400578 3548648 3713127 3793627 3841149 Apparatus for detecting damages of cutting tools Patent #: 4087801 InventorAssigneeApplicationNo. 06/116509 filed on 01/29/1980US Classes:73/104SURFACE AND CUTTING EDGE TESTINGExaminersPrimary: Ciarlante, Anthony V.Attorney, Agent or FirmInternational ClassesB23Q 17/09 (20060101)G01N 29/14 (20060101) G01N 3/58 (20060101) G01N 3/00 (20060101) Foreign Application Priority Data1979-01-31 JPAbstractFor detecting brittle fracture and wear of a tip of a cutting tool an acoustic emission monitoring system has a converter for converting acoustic emission into an electric signal, a filter for rejecting frequency components in the signal below a frequency between 50 kHz and 300 kHz, a detector to detect the amplitude of the signal after the rejection of those frequency components, and a comparator for comparing that amplitude to a predetermined reference amplitude. | |
