Worn tool detector utilizing normalized vibration signals
US4514797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1982 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Sep 3, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37245
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A worn tool detector system for analyzing input signals from a sensor were the signal is in the form of an analog waveform exhibiting periodic impulses exceeding the average amplitude thereof as the tool wears. A microprocessor controlled variable gain amplification network is utilized to normalize the average waveform amplitude to a fixed level. During machine operation, impulses are detected by comparing the sensor waveform to a programmable selected ratio of the normalized level. When a given number of successive impulses are received the microprocessor generates a warning signal which may be used to retract the tool. An adaptive mode is disclosed wherein the sensor waveform throughout the course of the machining operation is repetitively normalized to adjust for different sensor waveform amplitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.