Power supply apparatus for discharge surface treatment
US6783795B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2003 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Oct 28, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D3/141
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a power supply apparatus for discharge surface treatment which uses a green compact electrode as a discharge electrode, allows a pulse-type discharge to take place between said discharge electrode and a workpiece, and forms a film, which is made of an electrode material or a material obtained when the electrode material reacts to a discharge energy, on a surface of the workpiece following three measures are taken. (1) When a discharge voltage detected by the voltage detection means is less than or equal to discharge detection voltage set value which is slightly lower than a power supply voltage, the electric current cut-off means forcibly cuts off an output of the oscillator so that long-time pulse is prevented. (2) A capacitor is connected in parallel with an oscillation circuit of the oscillator, and the long-time pulse is prevented by capacitor discharge. (3) Time that the discharge takes place once is controlled by a timer so that the long-time pulse is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.