Electrical discharge machining apparatus with monitoring circuit and means to check the operability of the monitoring circuit
US4009361A · kind A · utility
9Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1974 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Dec 4, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H1/024
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A circuit for controlling an EDM process in which a logical monitoring circuit is used to detect a wrong discharge pulse out of the simultaneous occurrence and absence of certain electrical characteristics in the electrical discharge, as for example the absence of a high frequency component on the discharge voltage, as a criterion for an arc condition, the circuit including an input device connected to supply test signals to the monitoring circuit to simulate a wrong discharge pulse and thus enable checking of the monitoring circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.