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US Patent 4707688 - Detection of tool breaks that cause slowly decreasing cutting noise
US Patent Issued on November 17, 1987
Estimated Patent Expiration Date:
March 3, 2006Estimated 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.
Estimated Patent Expiration Date:
March 3, 2006Estimated 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.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
| InventorApplicationNo. 06/835698 filed on 03/03/1986US Classes:340/680, Machine tool340/683, Vibration73/104, SURFACE AND CUTTING EDGE TESTING73/660Rotating machinery or deviceField of Search340/680, Machine tool340/683VibrationExaminersPrimary: Rowland, James L.Assistant: Hofsass, Jeffery Attorney, Agent or FirmUS Patent References3793627, 4332161, Acoustic detection of tool wear and fractureIssued on: 06/01/1982 Inventor: Kakino4514797, Worn tool detector utilizing normalized vibration signals Issued on: 04/30/1985 Inventor: Begin4520674, Vibration monitoring device Issued on: 06/04/1985 Inventor: Canada , et al.4636779, Acoustic detection of tool break events in machine tool operations Issued on: 01/13/1987 Inventor: Thomas , et al.4636780, Acoustic monitoring of cutting conditions to detect tool break events Issued on: 01/13/1987 Inventor: Thomas , et al.4642617Acoustic tool break detection system and method Issued on: 02/10/1987 Inventor: Thomas , et al. International ClassesG01H 1/00 (20060101)G05B 19/4065 (20060101) G05B 19/406 (20060101) |
