Wire-cut electric discharge machining apparatus and control method therefor
First Claim
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1. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
- pulse train generating means for outputting a pulse train representing a machining current supplying duration;
pulse count integrating means for integrating, within a predetermined time, the number of pulses of pulse trains generated by said pulse train generating means; and
control means for controlling a machining condition according to a result of pulse number integration carried out by said pulse count integrating means.
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Abstract
A wire-cut electric discharge machining apparatus and a control method for the wire-cut EDM apparatus. The amount of current pulses supplied to a machining gap can be measured precisely without a detection delay to thereby detect the occurrence of faulty machining such as wire electrode breakage and centralized arcs.
43 Citations
18 Claims
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1. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
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pulse train generating means for outputting a pulse train representing a machining current supplying duration; pulse count integrating means for integrating, within a predetermined time, the number of pulses of pulse trains generated by said pulse train generating means; and control means for controlling a machining condition according to a result of pulse number integration carried out by said pulse count integrating means.
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2. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
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voltage detecting means for measuring a voltage during discharge; pulse train generating means for outputting a pulse train representing a machining current supplying duration only when the voltage detected by said voltage detecting means exceeds a certain voltage level representing valid electric discharge in an interelectrode gap; pulse count integrating means for integrating, within a predetermined time, the number of pulses of pulse trains generated by said pulse train generating means; and control means for controlling a machining condition according to a result of pulse number integration carried out by said pulse count integrating means. - View Dependent Claims (3)
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4. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
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pulse train generating means for outputting a pulse train representing a machining current supplying duration; pulse count integrating means for integrating, within a predetermined time, the number of pulses of pulse trains generated by said pulse train generating means; energy amount arithmetic means for calculating an amount equivalent to a machining energy from a result of the pulse count integrating means; and control means for controlling a machining condition according to an arithmetic result of said energy amount arithmetic means.
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5. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
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voltage detecting means for measuring a voltage during discharge; pulse train generating means for outputting a pulse train representing a machining current supplying duration only when the voltage detected by said voltage detecting means exceeds a certain voltage level representing valid electric discharge in an interelectrode gap; pulse count integrating means for integrating, within a predetermined time, the number of pulses of pulse trains generated by said pulse train generating means; energy amount arithmetic means for calculating an amount equivalent to a machining energy from a result of the pulse count integrating means; and control means for controlling a machining condition according to an arithmetic result of said energy amount arithmetic means. - View Dependent Claims (6, 7)
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8. An electric discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising:
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energy detecting means for detecting an amount of energy generated within a predetermined period of time; and a control means for stopping the supply of machining current when a detected amount of said energy detecting means exceeds a predetermined amount, to thereby control the amount of energy applied to an interelectrode gap between the wire-shaped electrode and the workpiece. - View Dependent Claims (9)
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10. A control method for use in an electrical discharge machining apparatus in which a pulse voltage is applied to an interelectrode gap between a wire-shaped electrode and a workpiece to machine the workpiece, comprising the steps of:
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outputting a pulse train representing machining current supplying time duration; integrating the pulses of said pulse train within a predetermined period of time; and controlling a machining condition based on the integration result. - View Dependent Claims (11)
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12. A control method for use in an electrical discharge machining apparatus in which a pulse voltage is applied to an interelectrode gap between a wire-shaped electrode and a workpiece to machine the workpiece, comprising the steps of:
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(a) detecting a voltage during the occurrence of discharge; (b) outputting a pulse train representing a machining current supplying duration only when the voltage detected by said voltage detecting means exceeds a certain voltage level representing valid electric discharge in an interelectrode gap; (c) integrating, within a predetermined time, the number of pulses of pulse trains generated in step (b); and (d) controlling a machining condition according to the result of pulse number integration in step (c). - View Dependent Claims (13)
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14. A control method for an electrical discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising the steps of:
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(a) outputting a pulse train representing a machining current supplying duration; (b) integrating, within a predetermined time, the number of pulses of pulse trains generated in step (a); (c) calculating an amount equivalent to a machining energy from the result of the pulse count integration in step (b); and (d) controlling a machining condition according to the result of said energy amount arithmetic operation in step (c).
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15. A control method for an electrical discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising the steps of:
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(a) detecting a voltage during the occurrence of discharge; (b) outputting a pulse train representing a machining current supplying duration only when the voltage detected by said voltage detecting means exceeds a certain voltage level representing valid electric discharge in an interelectrode gap; (c) integrating, within a predetermined time, the number of pulses of pulse trains generated in step (b); (d) calculating an amount equivalent to a machining energy from the result of the pulse count integration in step (c); and (e) controlling a machining condition according to the result of said energy amount arithmetic operation in step (d). - View Dependent Claims (16)
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17. A control method for an electrical discharge machining apparatus in which a pulse voltage is applied across a wire-shaped electrode and a workpiece to machine the workpiece with electrical discharges, comprising the steps of:
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(a) detecting an amount of energy generated within a predetermined period of time; and (b) stopping the supply of machining current when the detected energy exceeds a predetermined amount, to thereby control the amount of energy applied to an interelectrode gap between the wire-shaped electrode and the workpiece. - View Dependent Claims (18)
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Specification