Acoustic detection of tool break events in machine tool operations
Patent 4636779 Issued on January 13, 1987. Estimated Expiration Date: 
October 24, 2004. 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.
October 24, 2004. 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 3793627 3842663 Apparatus for detecting damages of cutting tools Acoustic detection of tool wear and fracture Method and arrangement for determining tool wear Rotating tool wear monitoring apparatus Worn tool detector utilizing normalized vibration signals Patent #: 4514797 InventorsApplicationNo. 06/664189 filed on 10/24/1984US Classes:340/680, Machine tool340/683, Vibration700/175, Condition of tool or workpiece (e.g., tolerance, tool wear)73/104, SURFACE AND CUTTING EDGE TESTING73/660Rotating machinery or deviceExaminersPrimary: Rowland, James L.Assistant: Hofsass, Jeffery Attorney, Agent or FirmInternational ClassesG05B 19/4065 (20060101)G05B 19/406 (20060101) AbstractA system and method for monitoring vibrations of a cutting tool produced by tool break events, and for interpreting them to detect tool breaks of sufficient magnitude to endanger the machined part. The signal generated by a sensor such as an accelerometer is preprocessed to attenuate low frequency machining noise and detect the energy in a higher frequency band, then sampled, and the digitized signal samples analyzed by tool break detection logic. This logic is triggered by a positive-going signal transient, and prevents false alarms on minor tool break events that do not mar the workpiece and on noise from other sources. | |
