Detection of tool breaks that cause slowly decreasing cutting noise
Patent 4707688 Issued on November 17, 1987. Estimated Expiration Date: 
March 3, 2006. 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.
March 3, 2006. 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 Acoustic detection of tool wear and fracture Worn tool detector utilizing normalized vibration signals Vibration monitoring device Acoustic detection of tool break events in machine tool operations Acoustic monitoring of cutting conditions to detect tool break events Acoustic tool break detection system and method Patent #: 4642617 InventorApplicationNo. 06/835698 filed on 03/03/1986US Classes:340/680, Machine tool340/683, Vibration73/104, SURFACE AND CUTTING EDGE TESTING73/660Rotating machinery or deviceExaminersPrimary: Rowland, James L.Assistant: Hofsass, Jeffery Attorney, Agent or FirmInternational ClassesG01H 1/00 (20060101)G05B 19/4065 (20060101) G05B 19/406 (20060101) AbstractVibrations at the cutting tool-workpiece interface are sensed and the accelerometer output is preprocessed to yield a cutting noise vibration signal. Digital analysis of the sampled signal is performed to detect a gradual cutting noise signal level decrease tool break signature, either continuously decreasing or decreasing in a series of small abrupt steps. A tool break alarm is generated, without false alarming on metal-to-air tool path transitions, as the mean cutting noise signal level falls below an upper check limit and, after a preset time has elapsed, crosses a lower check limit.Other References
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