Pulse generator for spark erosive metal working
US4713516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1985 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | May 10, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H2300/20
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pulse generator for spark erosive machining of a conductive workpiece, including a d.c. voltage source, a switching element such as a switching transistor connected in circuit with an inductive coil and the work gap across the voltage source, and a high frequency transformer, where one winding of the transformer is connected in parallel with the voltage source and the other winding is connected in parallel to the series circuit consisting of the inductance coil and the work gap. When the switching element is turned on, a machining pulse is applied to the gap; when the switching is turned off, stored energy in the inductance coil is dissipated across the gap and, owing to the transformer connection, generates a recuperation current flowing into the voltage source. The switching element is preferably controlled on the basis of the magnitude of the current flow through the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.