Multi-level tool break detection using multi-mode sensing
Patent 4918427 Issued on April 17, 1990. Estimated Expiration Date: 
March 27, 2009. 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 27, 2009. 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 ReferencesAcoustic detection of tool break events in machine tool operations Acoustic monitoring of cutting conditions to detect tool break events Cutting tool wear detection apparatus and method Patent #: 4831365 InventorsApplicationNo. 329044 filed on 03/27/1989US Classes:340/680, Machine tool73/104, SURFACE AND CUTTING EDGE TESTING73/660, Rotating machinery or device340/683VibrationExaminersPrimary: Orsino, Joseph A.Assistant: Hofsass, Jeffery Attorney, Agent or FirmForeign Patent References
International ClassG08B 021/00AbstractA system and method for monitoring machine tool operations provides a multi-level tool break alarm and uses information from multiple sensors of different types. Signal processing and pattern recognition logic techniques are applied to a cutting process high frequency vibration signal to detect major tool breaks requiring prompt stoppage of the cut. False alarm resistant detection of minor tool breaks, for which the response may not be an immediate stop of the cutting process, is obtained with information from a low frequency vibration sensor, an axis drive current sensor, or an axis velocity sensor. A minor tool break alarm is generated when signal transients in both a high frequency and low frequency channel signal are in close time coincidence, and a major alarm when the high frequency channel transient is followed by a persisting mean vibration level shift.Other References
| |
