Apparatus for regulating an electric discharge machining gap
US3973104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Jul 29, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H7/18
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The peak voltage of each discharge pulse is measured and, if the voltage of the pulse exceeds a high threshold value, there is also measured the time between the passing of that value and the moment the pulse voltage thereafter drops below a second lower threshold value. The two measurements are expressed in pulses that are combined, preferably by addition, to provide a regulating value, whose deviation ("error") from a standard value is predicted for a coming period, taking account of recent electrode position change as well as regulating value trend. The sign of the predicted error determines in which direction the electrode drive motor will be energized, but if the predicted error is less than a threshold value no motor energization occurs until the next error prediction. The sense in which the regulation operates is so defined that at a time when the electrodes are not already in relative movement an increase in the regulating value, at least if it persists, causes the electrodes to be moved closer together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.