Abstract: A wire electric discharge machining apparatus includes guide rollers, one electrode wire that is wrapped around each of the guide rollers to form cut wire portions spaced from one another between a pair of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element, and a high frequency insulator has wound coils which are formed of the electrode wire and located between adjacent ones of the cut wire portions 2a, respectively, and cores which close magnetic circuits of the individual coils, respectively, and are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another by the individual coils at high frequencies. As a result, it becomes possible to impress voltages on the individual cut wire portions independently, so discharges can be generated in a simultaneous and parallel manner.

Abstract: The present invention provides a wire electric discharge machining apparatus for machining a workpiece (1) by electric discharge in which driving means (9) relatively moves a wire electrode (5) and the workpiece (1) while machining power supplying means (10) supplies a working energy between the wire electrode (5) and the workpiece (1). The wire electric discharge machining apparatus comprises working energy adjusting means (13) for decreasing the working energy per unit movement distance of the wire electrode (5) when the distance between an approach point (O) connecting a runway portion (4) and a machining configuration portion (2) on the relative movement passage of the wire electrode (5) and the workpiece (1) and a center of the wire electrode (5) in the machining configuration portion (2) is within a range where the machining volume of the workpiece (1) per unit movement distance of the wire electrode (5) is decreased.

Abstract: The present invention provides a wire electric discharge machining apparatus for machining a workpiece (1) by electric discharge in which driving means (9) relatively moves a wire electrode (5) and the workpiece (1) while machining power supplying means (10) supplies a working energy between the wire electrode (5) and the workpiece (1). The wire electric discharge machining apparatus comprises working energy adjusting means (13) for decreasing the working energy per unit movement distance of the wire electrode (5) when the distance between an approach point (O) connecting a runway portion (4) and a machining configuration portion (2) on the relative movement passage of the wire electrode (5) and the workpiece (1) and a center of the wire electrode (5) in the machining configuration portion (2) is within a range where the machining volume of the workpiece (1) per unit movement distance of the wire electrode (5) is decreased.

Abstract: A wire electric discharge machine includes storage means for storing threshold value data found from a relation between the normal electric discharge pulse energy and the electric discharge machining energy setting value corresponding to various electric discharge machining conditions; and a controller for controlling the electric discharge machining energy setting value so that the threshold value data can approach an operation point at which wire breakage occurs.

Abstract: The wire electric-discharge machining apparatus is provided with an inter-pole voltage correction unit 109 which corrects a voltage corresponding to an inter-pole voltage according to a correction coefficient which increases with an elongation of discharge stop time. A corrected voltage corresponding to the inter-pole voltage output from the inter-pole voltage correction unit 109 is given to a control unit 106 to allow a wire electrode 101 and a workpiece 102 to relatively move according to the corrected voltage corresponding to the inter-pole voltage.

Abstract: In the wire electric-discharge machining apparatus, when a measured voltage exceeds a proportional constant switching voltage that is set higher than a short circuit reference voltage, a relative feed rate determining unit outputs a relative feed rate based on a preliminarily set proportional constant A according to an increase in the measured voltage. When the measured voltage is equal to a reference voltage, the relative feed rate determining unit outputs a target feed rate that becomes a target value, and also outputs a relative feed rate that follows a preset proportional constant B (<A) and that is a positive value when the measured voltage exceeds the short circuit reference voltage but is below the proportional constant switching voltage.

Abstract: A layered anisotropically conductive element, a resistant element, and a feed element constitute an electrode for discharge machining. The layered anisotropically conductive element includes high conductivity layers and low conductivity layers alternately laminated on each other, the high conductivity layers and the low conductivity layers being made of thin metallic plates coated with an insulating film. The layered anisotropically conductive element has an anisotropic conductivity, in which the conductivity in a direction parallel to the low conductivity layers is much higher than that in a direction perpendicular to the low conductivity layers. The resistant element is connected to one of end surfaces of the layered anisotropically conductive element perpendicular to the layers. The feed element is connected to the resistant element.

Abstract: In the wire electric-discharge machining apparatus, when a measured voltage exceeds a proportional constant switching voltage that is set higher than a short circuit reference voltage, a relative feed rate determining unit outputs a relative feed rate based on a preliminarily set proportional constant A according to an increase in the measured voltage. When the measured voltage is equal to a reference voltage, the relative feed rate determining unit outputs a target feed rate that becomes a target value, and also outputs a relative feed rate that follows a preset proportional constant B (<A) and that is a positive value when the measured voltage exceeds the short circuit reference voltage but is below the proportional constant switching voltage.

Abstract: The wire electric-discharge machining apparatus is provided with an inter-pole voltage correction unit 109 which corrects a voltage corresponding to an inter-pole voltage according to a correction coefficient which increases with an elongation of discharge stop time. A corrected voltage corresponding to the inter-pole voltage output from the inter-pole voltage correction unit 109 is given to a control unit 106 to allow a wire electrode 101 and a workpiece 102 to relatively move according to the corrected voltage corresponding to the inter-pole voltage.

Abstract: A wire-discharge machining apparatus for machining a workpiece by generating discharges between a wire electrode and the workpiece. In machining, the apparatus can detect all portions where wire-breakage frequently occurs and strictly discriminate between a condition detected and a control result, achieving wire-breakage prevention. This wire-discharge machining apparatus has an evaluating device and a controller. The evaluating device measure cycles, frequencies, or ignition delay times of the discharges as a measured value, evaluates the dispersion of the measured values, and outputs an evaluation value. The controller controls machining conditions according to the evaluation value.

Abstract: A layered anisotropically conductive element (11), a resistant element (12), and a feed element (13) constitute an electrode (14) for discharge machining. The layered anisotropically conductive element (11) includes conductive layers and low-conductive layers alternately laminated on each other, the conductive layers and the low-conductive layers being made of thin metallic plates coated with an insulative film. The layered anisotropically conductive element (11) has an anisotropic conductivity, in which the conductivity in a direction parallel to the low-conductive layers is much higher than that in a direction perpendicular to the low-conductive layers. The resistant element (12) is connected to one of layer-perpendicular end surfaces (11c) of the layered anisotropically conductive element (11). The feed element (13) is connected to the resistant element (12).

Abstract: To obtain high machining speed and machining accuracy in three-dimensional machining by using of an electrode of simple shape. Applying voltage between an electrode of simple shape and a workpiece, performing three-dimensional control by an NC control while synthesizing a feed of a Z-axis direction for correcting longitudinal consumed amount of an electrode with an X-Y plane feed, storing amount equivalent to an X-Y moving distance in an X-Y plane corresponding to correcting moving amount of the Z-axis direction in an electrical discharge machining method for machining a desired three-dimensional shape and performing a feed of correcting moving amount in the Z-axis direction each time a moving distance in the X-Y plane on a moving locus during machining reaches the above stored amount.

Abstract: A method for creating machining conditions and/or machining condition series capable of meeting a plurality of the required machining specifications, in which the method designates at least one of ranges of the machining specifications, ranges of satisfaction degrees the required specifications and functions indicating satisfaction degrees to the required specifications. The method determines a compromise between the required machining specifications The required machining specifications includes surface roughness, consumption rate of the electrode and machining time.

Abstract: An electric discharge machining apparatus in which at least either of a tool electrode or a workpiece is made of an anisotropic conductive material, includes, on a good conductive surface 20b of the anisotropic conductive material 2, a portion for connecting an isotropic conductive member 22. Electric discharge is generated on the good conductive surface 20b of the anisotropic conductive material 2. A conductive adhesive agent 23 is employed to bond the anisotropic conductive material 2 and the isotropic conductive member 22 to each other. The anisotropic conductive material is a pyrocarbon material. The pyrocarbon heat resolved carbon material is employed as a tool electrode material. Incombustible dielectric fluid, such as pure water, is employed as dielectric fluid.

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.

Abstract: A method for creating machining conditions and/or machining condition series capable of meeting a plurality of required machining specifications, in which the method designates at least one of ranges of the machining specifications, ranges of satisfaction degrees for the required specifications and functions indicating satisfaction degrees to the required specifications. The method determines a compromise between the required machining specifications. The required machining specifications includes surface roughness, consumption rate of the electrode and machining time.

Abstract: A method and apparatus for detecting and controlling the operation of an electric discharge machine for machining a workpiece. The machining is conducted by generating pulse discharges at a machining gap formed by a machining electrode and the workpiece opposed to each other. The alternating-current components or high frequency components of at least one of the current, voltage and impedance of the machining gap, the rectified components thereof, or amplitude, frequency or other signal characteristics thereof are detected and processed for control of the machining. The processing may include frequency analysis, pulse counting, threshold detection and the like using analog and digital processing.

Abstract: An electric discharge machining apparatus of the type in which an electric power for electric discharge is accumulated in capacitors to perform electric discharge machining. To provide an electric discharge machining apparatus in which the manufacturing cost is relatively low, the machining speed is high, the machined surface is not damaged, and the electrode wear is low, a plurality of capacitors are connected in parallel with a machining gap which is formed by a machining electrode and workpiece that face each other. Charging resistors are provided in a charging circuit which is connected between a charging device for charging the capacitors and the capacitors. Switches are connected in series in a discharging circuit which is connected between the capacitors and the machining gap. A control device for controlling the on/off operation of the switches sequentially is provided to performing the electric discharge machining with high speed and high accuracy.