Wire-cut electric discharge machine
First Claim
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1. A wire-cut electric discharge machine in which machining is carried out in a gap defined by wire electrode and workpiece, comprising:
- supply electrodes in electrical contact with said wire electrode;
a working power source providing discharge current to said supply electrodes;
a voltage detection means for detecting an integrated voltage value between said supply electrodes;
a current detection means for detecting an integrated current value of said discharge current; and
a control means for controlling said integrated current detected by said current detection means so as to increase or decrease the value thereof in response to the variation of the feed rate of the workpiece.
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Abstract
The wire-cut electric discharge machine controls the mean voltage or mean current detected in the detection circuit in response to the variation of the feed rate of the workpiece. The electrostatic attractive force and discharge repulsive force act to the workpiece and make a balance. As a result, the arcuate shape distortion is canceled.
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Citations
20 Claims
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1. A wire-cut electric discharge machine in which machining is carried out in a gap defined by wire electrode and workpiece, comprising:
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supply electrodes in electrical contact with said wire electrode; a working power source providing discharge current to said supply electrodes; a voltage detection means for detecting an integrated voltage value between said supply electrodes; a current detection means for detecting an integrated current value of said discharge current; and a control means for controlling said integrated current detected by said current detection means so as to increase or decrease the value thereof in response to the variation of the feed rate of the workpiece. - View Dependent Claims (2, 3, 4, 5, 7, 8, 10, 11)
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6. A wire-cut electric discharge machine in which machining is carried out in a gap defined by wire electrode and workpiece, comprising:
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supply electrodes in electrical contact with said wire electrode; a working power source for providing discharge current to said supply electrodes; a voltage detection means for detecting an integrated voltage value between said supply electrodes; a current detection means for detecting an integrated current value of said discharge current; and a control means for controlling said integrated current to be a predetermined value and also for controlling said integrated voltage detected in said voltage detection means so as to increase or decrease the value thereof in response to the variation of the feed rate of the workpiece. - View Dependent Claims (9)
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12. A method of machining a workpiece using a wire-cut electric discharge machine, having a power source for providing a discharge current to a wire electrode and enabling a discharge across a gap defined by the electrode and the workpiece, the method comprising the steps of:
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(a) detecting at least one of an integrated discharge current value and the integrated discharge voltage value across the gap; and (b) maintaining the electrostatic attractive force and the discharge repulsive force at the gap at substantially equal but opposite values controlling one of the integrated current and voltage values at the gap, wherein the electrostatic attractive force is proportional to the integrated voltage value and the discharge repulsive force is proportional to the integrated current value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification