Method of monitoring machining load using variable alarm threshold
US5631851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1994 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Oct 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/50197
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of monitoring machining load on a numerically controlled machine tool in such a way that incorrect judgment due to variations in machining load which are caused according to the machining conditions is made less frequent. The method is started by performing plural trial cutting operations. A signal indicating the machining load during these trial cutting operations is sampled and thus, sampling data is obtained. Reference data about the machining load and its variance are calculated from the sampling data and loaded in a reference data table. A threshold value according to variations in the sampling data is established, using the value of the variance. A load monitor means compares the reference data with data about the machining load obtained from actual measurements whenever each interval of time elapses. A decision is made as to whether the difference exceeds the threshold value. In this way, the machining load is monitored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.