ELECTRIC DISCHARGE MACHINING APPARATUS
First Claim
1. An electric discharge machining apparatus for machining a work piece by supplying a current pulse to a machining gap formed between the work piece and a tool electrode while alternately switching between a straight polarity, in which the work piece is a positive potential and the tool electrode is a negative potential, and a reverse polarity, in which the work piece is the negative potential and the tool electrode is the positive potential, the electric discharge machining apparatus comprising:
- a power supply having a positive pole and a negative pole;
a first switch disposed between the positive pole of the power supply and the work piece;
a second switch disposed between the work piece and the negative pole of the power supply;
a third switch disposed between the tool electrode and the negative pole of the power supply;
a fourth switch disposed between the positive pole of the power supply and the tool electrode; and
a pulse generating device controlling the first switch, the second switch, the third switch, and the fourth switch,wherein while one of the first switch and the third switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the first switch and the third switch so as to supply a series of current pulses with the straight polarity to the machining gap, andwhile one of the second switch and the fourth switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the second switch and the fourth switch so as to supply a series of current pulses with the reverse polarity to the machining gap.
1 Assignment
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Accused Products
Abstract
The present invention relates to an electric discharge machining device. The electric discharge machining device includes: a first switch provided between the positive pole of a power supply and a work piece; a second switch provided between the negative pole of the power supply and the work piece; a third switch provided between the negative pole of the power supply and a tool electrode; a fourth switch provided between the positive pole of the power supply and the tool electrode; and a pulse generating device. In order to supply current pulses with a straight polarity, the pulse generating device repeatedly switches on and off either the first or third switch while the other switch is on. In order to supply current pulses with a reverse polarity, the pulse generating device repeatedly switches on and off either the second or fourth switch while the other switch is on.
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Citations
12 Claims
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1. An electric discharge machining apparatus for machining a work piece by supplying a current pulse to a machining gap formed between the work piece and a tool electrode while alternately switching between a straight polarity, in which the work piece is a positive potential and the tool electrode is a negative potential, and a reverse polarity, in which the work piece is the negative potential and the tool electrode is the positive potential, the electric discharge machining apparatus comprising:
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a power supply having a positive pole and a negative pole; a first switch disposed between the positive pole of the power supply and the work piece; a second switch disposed between the work piece and the negative pole of the power supply; a third switch disposed between the tool electrode and the negative pole of the power supply; a fourth switch disposed between the positive pole of the power supply and the tool electrode; and a pulse generating device controlling the first switch, the second switch, the third switch, and the fourth switch, wherein while one of the first switch and the third switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the first switch and the third switch so as to supply a series of current pulses with the straight polarity to the machining gap, and while one of the second switch and the fourth switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the second switch and the fourth switch so as to supply a series of current pulses with the reverse polarity to the machining gap. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electric discharge machining apparatus for machining a work piece by supplying at least one current pulse with a reverse polarity to a machining gap formed between the work piece and a tool electrode after supplying at least one current pulse with a straight polarity to the machining gap, wherein the work piece is a negative potential and the tool electrode is a positive potential in the reverse polarity, and the work piece is the positive potential and the tool electrode is the negative potential in the straight polarity, the electric discharge machining apparatus comprising:
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a first power supply having a positive pole and a negative pole; a second power supply having a positive pole and a negative pole; a first switch disposed between the positive pole of the first power supply and the work piece; a second switch disposed between the work piece and the negative pole of the second power supply; a third switch disposed between the tool electrode and the negative pole of the first power supply; a fourth switch disposed between the positive pole of the second power supply and the tool electrode; and a pulse generating device controlling the first switch, the second switch, the third switch, and the fourth switch, wherein while one of the first switch and the third switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the first switch and the third switch so as to supply the current pulse with the straight polarity to the machining gap, and while one of the second switch and the fourth switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the second switch and the fourth switch so as to supply the current pulse with the reverse polarity to the machining gap. - View Dependent Claims (9, 10, 11, 12)
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Specification