Method and generator for electrical discharge machining
First Claim
1. A method of generating a time sequence of EDM pulses having a predefined ignition voltage for electrical discharge machining wherein an AC voltage is generated from a DC voltage furnished by a bipolar current source, said AC voltage is applied to an isolating transformer disposed between said bipolar current source and the spark gap, at least one first pulse capacitor is charged by said bipolar current source to a charging voltage corresponding to the ignition voltage, and said ignition voltage provided by said isolating transformer is switched with a selected polarity to said spark gap.
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Abstract
The invention relates to a method and generator for generating a time sequence of EDM pulses having a predefined ignition voltage for electrical discharge machining. An AC voltage is generated from a DC voltage, furnished by a bipolar current source. The AC voltage is applied to an isolating transformer disposed between the bipolar current source and the spark gap. A first pulse capacitor is charged by the bipolar current source to a voltage corresponding to the ignition voltage. The ignition voltage provided by the isolating transformer is switched with a selected polarity to the spark gap.
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Citations
51 Claims
- 1. A method of generating a time sequence of EDM pulses having a predefined ignition voltage for electrical discharge machining wherein an AC voltage is generated from a DC voltage furnished by a bipolar current source, said AC voltage is applied to an isolating transformer disposed between said bipolar current source and the spark gap, at least one first pulse capacitor is charged by said bipolar current source to a charging voltage corresponding to the ignition voltage, and said ignition voltage provided by said isolating transformer is switched with a selected polarity to said spark gap.
- 26. A generator for electrical discharge machining for generating a time sequence of EDM pulses with a predefined ignition voltage, comprising a bipolar current source which furnishes a DC voltage with both polarities, an AC voltage generator circuit which generates from said DC voltage from said bipolar current source an AC voltage, an isolating transformer between said bipolar current source and said spark gap to the input of which said AC voltage is applied from said AC voltage generator circuit and the output of which provides said ignition voltage with both polarities, at least one first pulse capacitor between said bipolar current source and said spark gap which is charged by said bipolar current source to a charging voltage corresponding to said ignition voltage, and a switching means between said isolating transformer and said spark gap which is controlled by a controller for switching said ignition voltage with a selected polarity to said spark gap.
Specification