Apparatus for electric discharge machining
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHiroyuki Ohguro, Seiji Satou, Akihiko Iwata, Akihiro Suzuki
Life of this patent
Estimating the term…
Abstract
A power supply apparatus for electric discharge machining is provided with a current loop including a diode, which is supplied with a forward current at the same time a voltage for generating a discharge is output or before it; and a resistor. Supply of forward current to the diode is blocked the moment a discharge is generated. By doing so, a reverse recovery current of the diode is supplied in a gap between an electrode and a workpiece to be machined.
Claims7
A power supply apparatus for electric discharge machining a workpiece, the power supply apparatus comprising:
- an electrode;
- a first switching circuit;
- a second switching circuit connected parallel to said first switching circuit, wherein a pulse current is supplied in a gap between said electrode and said workpiece first by said first switching circuit and by said second switching circuit, and said workpiece is machined while controlling a relative position of said electrode and workpiece;
- and
- a current loop including a diode, which is supplied with a forward current at or prior to a time when a voltage for generating a discharge is output,
- wherein, when a discharge is generated, a supply of forward current to the diode is blocked and a reverse recovery current of said diode is output to the gap between said electrode and said workpiece.
A power supply apparatus for electric discharge machining a workpiece, the power supply apparatus comprising:
- an electrode;
- a first switching circuit;
- a second switching circuit connected parallel to said first switching circuit, wherein a pulse current is supplied in a gap between said electrode and said workpiece first by said first switching circuit and by said second switching circuit, and said workpiece is machined while controlling a relative position of said electrode and workpiece;
- and
- a current loop including a capacitor, which charges the capacitor at or prior to a time when a voltage for generating a discharge is output,
- wherein a discharge current from said capacitor is supplied in the gap between said electrode and said workpiece prior to a machining current output by said second switching circuit after a discharge is generated.
Dependencies are inferred from the claim text.