Electric discharge machine
First Claim
1. An electric discharge machine having a main power supply and a sub-power supply connected in parallel across a gap formed by an electrode and a workpiece, in which a voltage is applied first from the sub-power supply to the gap, and then machining energy is supplied to the gap from the main power supply when detected that a gap voltage has fallen to or below a certain detection level, wherein the electric discharge machine changes said detection level during machining by the electric discharge machine according to a machining state.
1 Assignment
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Accused Products
Abstract
An electric discharge machine has a main power supply and a sub-power supply connected in parallel across a gap formed by an electrode and a workpiece. A voltage is first applied to the gap from the sub-power supply, and then machining energy is supplied to the gap from the main power supply when detected that the gap voltage has fallen to or below a certain detection level. Stable machining is achieved by changing the detection level according to the machining state.
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Citations
6 Claims
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1. An electric discharge machine having a main power supply and a sub-power supply connected in parallel across a gap formed by an electrode and a workpiece, in which a voltage is applied first from the sub-power supply to the gap, and then machining energy is supplied to the gap from the main power supply when detected that a gap voltage has fallen to or below a certain detection level, wherein
the electric discharge machine changes said detection level during machining by the electric discharge machine according to a machining state.
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4. An electric discharge machine comprising:
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a main power supply and a sub-power supply connected in parallel across a gap formed by an electrode and a workpiece;
detecting means for detecting a gap voltage across said gap and comparing the gap voltage with a detection level;
control means for controlling timings at which voltages are applied from said main power supply and said sub-power supply to said gap and switching the voltage application source from the sub-power supply to the main power supply when the detection result from said detecting means-indicates that said gap voltage has fallen to or below the detection level;
machining state detecting means for detecting a machining state of the electric discharge machine during machining according to the detection result from said detecting means; and
detection level changing means for changing the detection level used by said detecting means, according to the machining state detected by said machining state detecting means. - View Dependent Claims (5, 6)
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Specification