| 摘要 |
PURPOSE:To permit even a DC supply source of low voltage and small capacity to perform electric discharge machining of stable worked surface roughness by jointly using a switching element, an inductance coil and a capacitor. CONSTITUTION:A transistor 6 is turned on/off by a control circuit 13, and while the transistor 6 is conducting, an inductance coil 8 and a capacitor 10 are simultaneously charged with energy. Even after the charging of the capacitor 10 has been completed, a minute current due to a by-pass resistor is flowing through the inductance coil 8. When the transistor 6 is turned off, a high-voltage impulse due to a counter electromotive force generated in the inductance coil 8 is applied through a polarity switch 4 and a diode 9 to a working gap 3 to breakdown the insulation. Then, electric discharge machining is performed by the given amount of working energy stored in the capacitor 10. Thereby, excellent electric discharge machining, by which the worked surface roughness is also stabilized, is made possible. |
