Acoustic detection of contact between cutting tool and workpiece
US4631683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1984 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37351
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method for monitoring vibrations of a machine tool metal-cutting tool insert and interpreting them to promptly detect the initial touch to the workpiece and signal the tool to stop advancing before marring the surface. The signal generated by a sensor such as an accelerometer is preprocessed to eliminate lower frequency machine noise and detect the energy in a higher frequency band, then sampled and analyzed by digital circuitry. In order to avoid false alarms on high amplitude spiky noise pulses generated by traverse operation of the machine tool, the tool touch alarm is delayed longer than the maximum duration of the noise pulses. Two techniques are given to ignore the noise spikes while still detecting the tool touch signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.