Wire electric discharge machine having alterable discharge period
First Claim
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1. A wire electric discharge machine in which a workpiece is processed by repetitively inducing a pulse-shaped discharge across a wire electrode and the workpiece, comprising:
- processing condition setting means for setting information on a workpiece and processing conditions;
discharge control means for applying a pulse-shaped voltage across a wire electrode and a workpiece on the basis of a discharge period set by the processing condition setting means;
inter-electrode voltage detection means for detecting an average voltage across the wire electrode and the workpiece;
relative movement means for relatively moving the wire electrode and the workpiece;
moving speed control means for controlling the relative moving speed between the wire electrode and the workpiece so that a one of the average inter-electrode voltage detected by the inter-electrode voltage detection means is equal to a target inter-electrode voltage set by the processing condition setting means and the relative moving speed is equal to a feeding speed set by the processing condition setting means;
discharge-frequency detection means for detecting the number of times of discharge per unit time across the wire electrode and the workpiece;
thickness estimating means for estimating the thickness of the workpiece on the basis of the number of times of discharge per unit time detected by the discharge-frequency detection means, the relative moving speed between the wire electrode and the workpiece which is controlled by the moving speed control means and information on the workpiece which is set by the processing condition setting means;
discharge period generating means for generating an optimum discharge period on the basis of the thickness of the workpiece estimated by the thickness estimating means and the processing conditions set by the processing condition setting means; and
discharge period altering means for altering a discharge period at which the pulse-shaped voltage is applied by the discharge control means to the discharge period generated by the discharge period generating means.
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Abstract
A discharge frequency per unit time between a wire electrode and a workpiece is detected, and the thickness of the workpiece is estimated on the basis of the discharge frequency, the relative moving speed between the wire electrode and the workpiece and the information on the shape of the workpiece. Thereafter, the optimum discharge period is calculated on the basis of the estimated thickness of the workpiece and the set processing conditions to perform the processing of the workpiece.
18 Citations
15 Claims
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1. A wire electric discharge machine in which a workpiece is processed by repetitively inducing a pulse-shaped discharge across a wire electrode and the workpiece, comprising:
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processing condition setting means for setting information on a workpiece and processing conditions; discharge control means for applying a pulse-shaped voltage across a wire electrode and a workpiece on the basis of a discharge period set by the processing condition setting means; inter-electrode voltage detection means for detecting an average voltage across the wire electrode and the workpiece; relative movement means for relatively moving the wire electrode and the workpiece; moving speed control means for controlling the relative moving speed between the wire electrode and the workpiece so that a one of the average inter-electrode voltage detected by the inter-electrode voltage detection means is equal to a target inter-electrode voltage set by the processing condition setting means and the relative moving speed is equal to a feeding speed set by the processing condition setting means; discharge-frequency detection means for detecting the number of times of discharge per unit time across the wire electrode and the workpiece; thickness estimating means for estimating the thickness of the workpiece on the basis of the number of times of discharge per unit time detected by the discharge-frequency detection means, the relative moving speed between the wire electrode and the workpiece which is controlled by the moving speed control means and information on the workpiece which is set by the processing condition setting means; discharge period generating means for generating an optimum discharge period on the basis of the thickness of the workpiece estimated by the thickness estimating means and the processing conditions set by the processing condition setting means; and discharge period altering means for altering a discharge period at which the pulse-shaped voltage is applied by the discharge control means to the discharge period generated by the discharge period generating means. - View Dependent Claims (2, 3)
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4. A method of processing a workpiece with a wire electric discharge machine, comprising the steps of:
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setting an initial discharge period; setting a one of a target inter-electrode voltage and a relative moving speed between the workpiece and a wire of the wire electric discharge machine; controlling the relative moving speed between the workpiece and the wire of the wire electric discharge machine; and renewing the discharge period on a periodic cycle, wherein the step of renewing the discharge period comprises the steps of; estimating the thickness of the workpiece; generating an optimum discharge period for the material and the estimated thickness of the workpiece; and after the initial discharge period, using the generated optimum discharge period as a current discharge period. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A wire electric discharge machine for processing a workpiece, comprising:
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means for setting an initial discharge period; means for setting a one of a target inter-electrode voltage and a relative moving speed between the workpiece and a wire of the wire electric discharge machine; means for controlling the relative moving speed between the workpiece and the wire of the wire electric discharge machine; and means for renewing the discharge period on a periodic cycle, wherein the means for renewing the discharge period comprises; means for estimating the thickness of the workpiece; means for generating the optimum discharge period for the material and the estimated thickness of the workpiece; and after the initial discharge period, means for using the generated optimum discharge period as a current discharge period. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification