Multi-level tool break detection using multi-mode sensing
US4918427A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1989 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Mar 27, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23Q17/0971
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.