Abstract: Deionisation and clarification process of the aqueous medium used in an electroerosion machine and product for this process, where the electroerosion machines are comprised of a purification circuit for this aqueous medium, which includes an ion exchange phase between some cationic and anionic resins with the aqueous dielectric medium, which has a conductivity of less than 40 ?S/cm, and to which a solution of oxalic acid and phosphoric acid in distilled/deionised water is added in the approximate proportion of oxalic acid between 0.18 and 0.035 moles and phosphoric acid between 1.28 and 2.5 moles per liter of solution.

Abstract: A table for placing a workpiece is grounded. An electrode for detecting machining fluid level is attached to an upper guide that guides the wire electrode, with the electrode insulated from the upper guide. A voltage is applied to the electrode, and the voltage between the electrode and the grounded table is detected and compared with a threshold value to determine whether the machining fluid level has reached a predetermined height.

Abstract: A small-hole electrical discharge machining device comprises a diaphragm which can be moved up and down along a notch window provided in a work tank for mounting a work in the work tank in which a working fluid can be filled or discharged, and adjusts the height of the working fluid; a W-axis slide which can be moved up and down, and having an electrode guide in the lower end portion; a master cylinder which is moved up and down corresponding to up-and-down movement of the W-axis slide; and a slave cylinder which is connected with the master cylinder through a pipeline and with a diaphragm driving mechanism, and wherein the diaphragm is moved up and down corresponding to up and down movement of the W-axis slide.

Abstract: A method and apparatus for electro discharge machining a passage through a work piece using a hollow electro discharge machining electrode and a corresponding flushing agent supplied via the hollow electrode. A backing member is positioned abutting the exit face of the work piece so that at break through the path of the flushing agent is not disrupted. The backing member positioned such that it forms a fluid tight seal with the work piece.

Abstract: A machining-fluid ejection device for a wire electric discharge machining apparatus includes a nozzle for ejecting machining-fluid into an inter-electrode gap between a workpiece (W) and a wire electrode (E), a casing (16) fixed to a machining head (15) disposed above or below the workpiece (W), a coupling member (18) for coupling the casing (16) and a nozzle (17), having a predetermined elastic coefficient, and deforming according to the machining-fluid pressure; an assemblage of the coupling member (18) and the nozzle (17) has hollow portions, formed with an inlet side internal diameter (D2) and an outlet side internal diameter (D1) on a machining-fluid inlet side and outlet side respectively, whose sectional areas do not change, and a hollow portion, formed with a minimum internal diameter (D0) between the machining-fluid inlet side and the outlet side, whose sectional area does not change. Machining productivity may be raised for nozzle contact machining and nozzle separation machining.

Abstract: A small hole electrical discharge machining apparatus includes an electrode holder that holds an upper part of an electrode, an electrode guider that guides a lower part of the electrode, a jet nozzle that injects water jet to the electrode holder, and a fluid channel that supplies a gas, such as air, to an electrode guide of the electrode guider. The electrode is guided with the water jet toward the workpiece, such that small hole electrical discharge machining is performed while the gas is being released from the electrode guide into a working liquid via the fluid channel.

Abstract: A guide bushing for use in association with electrical discharge machining (EDM) apparatus including a rotatable electrode defining a longitudinal axis, is provided. The guide bushing includes a body portion defining a bore therethrough for receiving at least a portion of the electrode therein. The bore includes a proximal portion sized to be in contact with an outer surface of the electrode, an intermediate portion sized to be spaced from the electrode, and a distal portion sized to be at least partially in contact with the outer surface of the electrode.

Abstract: An electric sparking drill and a method for using the same to drill a hole in a workpiece where at least one of a voltage applied to an electrode, the conductivity of a liquid applied between the electrode and the workpiece during drilling, and a gap between the electrode and the workpiece are controlled to create the desired hole in the workpiece. The electric sparking drill and a method for using the same to drill a hole in a workpiece also improve the hole operation and/or the quality of the hole made by operating at the arcing voltage, including a touch stop function, including a sacrificial electrode, and/or including a guide member function.

Abstract: A wire electric discharge machining apparatus has a wire guide upper unit for slidably retaining a wire electrode above a subject to be machined, a wire guide lower unit for slidably retaining the wire electrode below the subject, an arm member for retaining the wire guide lower unit in a position opposite to the wire guide upper unit, a machining tank filled with machining solution in which the subject is immersed and having a long hole through which the arm member can pass and move, and a scaling unit for suppressing outflow of the machining solution from the long hole. The sealing unit has a sealing plate for blocking the long hole of the machining tank. The wire electric discharge machining apparatus has machining solution jetting unit for jetting the machining solution into a small gap formed between a peripheral portion of the long hole and the sealing plate.

Abstract: WC powder (11) and W powder (12) are mixed and entered in a press mold and compressed and molded, thereby forming a discharge surface treatment electrode (10). Discharge is caused to occur between the discharge surface treatment electrode (10) and a workpiece (16) by a discharge surface treatment power unit (17), whereby a component of the discharge surface treatment electrode (10) melted by discharge heat is deposited on the workpiece (16). W, a component of the discharge surface treatment electrode (10), reacts with C, a component of work liquid (4), to produce WC and together with the WC which is a component of the discharge surface treatment electrode (10) a hard film (20) made of WC is formed on the workpiece (16). The hardness and strength of the hard film formed on the workpiece (16) by the discharge surface treatment can be enhanced.

Abstract: Method and apparatus for repairing an article, such as an air-cooled component, during which at least a portion of the component must be removed and replaced. The method and apparatus make use of one or more workpiece holders adapted to secure and position an component on the apparatus, a multi-axis head adapted for movement relative to the workpiece holder, a nozzle mounted to the multi-axis head and operable to remove at least a portion of the component with a jet of fluid discharged therefrom, an electrical-discharge electrode mounted to the multi-axis head and operable to form surface holes in the component by electrical-discharge machining, and a system for controlling the movement of the multi-axis head so that the waterjet and electrical-discharge machining operations are performed to yield a repaired component that closely duplicates the original.

Abstract: A CAD/CAM device for an electric discharge machine comprises a check unit (32) for checking whether or not a level (HC) of a clamp is lower than a safe level (HLS) of the machining solution surface before conducting actual machining. The machining tank (7) can be automatically driven so that machining solution surface level HL is set at safe level (HLS). Therefore, before the process of actual machining, it is possible to check whether or not the clamp device (5) is soaked in the machining solution (8) when machining is actually conducted.

Abstract: A wire-electrical discharge machine infuses a processing liquid in a gap between a wire and a workpiece and processes the workpiece using predetermined processing parameters. The machine includes a processing parameter memory that stores processing parameters, a second memory that stores a relationship between nozzle height and processing energy, a processing energy determining unit that determines the processing energy, for example, during rough processing, based on the relationship, and a processing parameter changing unit that changes the processing parameters based on the processing energy. The workpiece is processed using the changed processing parameters. According to this construction, wire breakage can be prevented and the accuracy of the processed surface can be improved.

Abstract: A method and apparatus for electro discharge machining a passage through a work piece using a hollow electro discharge machining electrode and a corresponding flushing agent supplied via the hollow electrode. A backing member is positioned abutting the exit face of the work piece so that at break through the path of the flushing agent is not disrupted. The backing member positioned such that it forms a fluid tight seal with the work piece.

Abstract: There is provided a control means (11) structured in such a manner that a signal of ON/OFF of electric power of the temperature control unit (7) is received by the signal receiving section (12), according to ON/OFF of the received signal of the signal receiving section (12), the correction calculating section (13) calculates an amount of correction, this amount of correction is sent to the amplifier output command section (14), and the amplifier output command section (14) sends an axial feed operation command of the amount of correction to the drive means (15). Correction of the thermal displacement of the machine body generated by a change in the temperature of the machining solution can be easily, effectively conducted without using a specific device, and the machining accuracy can be enhanced.

Abstract: An electrical discharge machining system for machining a workpiece. The system comprises a wire guide support for positioning and guiding a wire electrode into a desired position relative to the workpiece and a source of a liquid dielectric fluid. The supply also provides means for directing the dielectric fluid from the source to a machining site between the electrode and the workpiece, and for atomizing the dielectric fluid in the machining site.

Abstract: Electrical discharge machines are disclosed that are capable of a relatively wide range of flexibility and range of motion for performing electrical discharge operations. The electrical discharge machine herein can optionally comprise up to, and in excess of six axes of motion to adjust the electrode relative to the workpiece. To effectively remove the swarf that is generated during electroerosion operations, a primary flushing system and an optional auxiliary flushing system are provided. The auxiliary flushing system is used to direct dielectric fluid towards the workpiece external to the electrode. Further, methods of performing high speed electrical discharge machining operations are disclosed, including methods for establishing the zero set conditions that indicate initiation of the electroerosion process based upon a detection of dither on the electrode travel.

Abstract: A method of wire electric discharge machining by which an electric discharge is generated in a gap between a wire electrode (1a) and a workpiece (2) so that the workpiece (2) is machined, includes the steps of: a first step in which electric discharge machining is conducted in a dielectric liquid (4a); a second step in which electric discharge machining is conducted in mist (7); and a third step in which electric discharge machining is conducted in gas (8), such that the machining process is changed over when straightness of the workpiece (2) becomes a predetermined value. It is possible to provide a method of wire electric discharge machining, the productivity of which is high, suitable for highly accurate machining.

Abstract: For maintenance and management of filters in a wire electric discharge machine, a sensor for detecting the filtration pressure is disposed between the filter and pump in the working fluid circulation channel. The sensor periodically senses the pressure and its output (transition of water pressure) is stored and sequentially displayed as a graph on a display device to allow monitoring of filter clogging by checking such sensor output at the time of commencing the processing.

Abstract: A perforated electrode has strategically distributed flushing holes through which a flushing medium is discharged. The electrode can be used for either electrochemical machining (ECM) or electrodischarge machining (EDM). The flushing medium is either electrolyte in ECM or a dielectric fluid in EDM. It is discharged from the tool electrode directly against the workpiece surface or surfaces which are undergoing material removal. This removes heat and sludge or debris.

Abstract: An electrode clamping system for an EDM-sinking system provides a two-sided dielectric fluid supply to a clamped electrode by placing supply channels in both the fixed and movable parts of the electrode clamping holder. An automatic control circuit controls the flow of the dielectric fluid with reference to a contamination particle concentration in the gap between the electrode and the workpiece, and automatically reduces the flow to a value at which electrode vibrations disappear when changing from rough machining to fine machining.

Abstract: The wire electric discharge machining apparatus includes apparatus or generating a discharge in a gap between a wire electrode (1a) and a machining subject (2) to machine the machining subject. A gas supplying unit (8) supplies a pressurized gas in the gap between the wire electrode and the machining subject. This wire electric discharge machining apparatus has a high productivity, and it is suitable for high-precision machining.

Abstract: An electric sparking drill and a method for using the same to drill a hole in a workpiece where at least one of a voltage applied to an electrode, the conductivity of a liquid applied between the electrode and the workpiece during drilling, and a gap between the electrode and the workpiece are controlled to create the desired hole in the workpiece. The electric sparking drill and a method for using the same to drill a hole in a workpiece also improve the hole operation and/or the quality of the hole made by operating at the arcing voltage, including a touch stop function, including a sacrificial electrode, and/or including a guide member function.

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: A wire cut electric discharge machine that includes a machining tank storing a machining fluid, an upper arm disposed at an upper portion of the machining tank, a lower arm inserted into the machining tank, a wire electrode extending between the upper arm and the lower arm for performing electric discharge machining on a workpiece placed fixedly in the machining tank, a support member mounted to the machining tank for supporting the lower arm such that the lower arm is slidable relative to the machining tank and sealed from the machining tank, and an O-ring interposed between the lower arm and the support member. The support member has a groove formed all around its inner circumference, and the O-ring makes contact with sidewalls of the groove. Accordingly, even when the outside diameter of the O-ring varies depending on an error in diameter of the lower arm, contact between the sidewalls and the O-ring remains unchanged and fluid-tightness can be reliably ensured.

Abstract: A small hole electrical discharge machining apparatus, including: a slide base; a Z axis slide freely positionable in a vertical direction, the Z axis slide being provided on the slide base; an electrode holding member for holding an upper portion of a stick-shaped or pipe-shaped electrode, the electrode holding member being provided on the Z axis slide so as to be freely rotatable; an electrode guiding member for guiding a lower portion of the electrode, the electrode guiding member being provided on the slide base; and an electrode motor for rotatively driving the electrode holding member, the electrode motor being provided on the Z axis slide. Moreover, the electrode holding member is provided with a jet nozzle for guiding the electrode by use of a water jet.

Abstract: A wire electrical discharge machining apparatus provided with: a nozzle for spraying and supplying machining liquid, the nozzle being supported so that a state of the nozzle is switched over from a contact state with a work piece to a non-contact state with the work piece, and vice versa; a spring acting on the nozzle in a direction to make the nozzle move away from the work piece; a pump for changing and controlling a hydraulic pressure of the machining liquid; and electrical conduction switch-over apparatus by which power supply to the work piece is switched over from the nozzle of a conductor to apparatus other than the nozzle, and vice versa, such that the hydraulic pressure of the machining liquid during electric discharge machining is changed and controlled by the pump so that the state of the nozzle is switched over from the contact state to the non-contact state.

Abstract: The machining liquid includes a load of particles contained in a dielectric liquid. The particles are carbon microfibers, sectioned or not, having a diameter (e) comprised between 0.2 and 8 micrometers and a length which is a function of the machining gap (G) provided between the electrode-tool and the electrode-workpiece. Thanks to this load of carbon microfibers of well-defined dimensions and geometry, the electro-erosion output, the precision of machining, the condition of the surface obtained and the ability to replicate machining performances, are considerably improved.

Abstract: A dielectric fluid system (2) for an electric discharge machining apparatus includes an auxiliary tank (22) positioned at or higher than a work tank (12) and a dielectric fluid reservoir (21), a filter device (23), and a first pump (P1) and a second pump (P2) upstream and downstream of the filter device 23. Dielectric fluid in the dielectric fluid reservoir (21) is filtered by the filter device (23), and pumped to the auxiliary tank (22) using the first and second pumps (P1) and (P2). The filtered dielectric fluid is then rapid fed from the auxiliary tank (22) to the work tank (12). During electric discharge machining, dielectric fluid is pumped from the work tank (12), filtered, then cooled and circulated directly back to the work tank (12). A flushing pipe line and a third pump (P3) may be added into the circulating pipe line.

Abstract: An electrical discharge machining system for machining a workpiece. The system comprises a wire guide support for positioning and guiding a wire electrode into a desired position relative to the workpiece and a source of a liquid dielectric fluid. The supply also provides means for directing the dielectric fluid from the source to a machining site between the electrode and the workpiece, and for atomizing the dielectric fluid in the machining site.

Abstract: The present invention relates to the maintenance and management of filters in a wire electric discharge machine. A sensor for detecting the filtration pressure is disposed between the filter and pump in the working fluid circulation channel. The sensor output is sequentially displayed as a graph on a display device. The operator is thereby able to comprehend the progress status of filter clogging by checking such sensor output (transition of water pressure) at the time of commencing the processing.

Abstract: A leakproof device of the work tank of a wire cut machine comprising a fixed plate fastened on the work tank, and a locating plate fastened with a lower arm of the wire cut machine. The fixed plate is provided in the fringe of a hollow portion thereof with an annular slot into which the compressed air is injected to form an air wall to reduce the friction between fixed plate and movable plate, also to prevent the machining fluid leaking from the work tank.

Abstract: A machine tool with a machine frame is disclosed. A first tool guide is provided on the frame to guide a tool to a first guide position. The first tool guide is a movable gantry carrier with a movable first sliding carriage. The tool guide can be moved with respect to the machine frame in a first plane along a first direction and in a second direction which is orthogonal with respect to the first direction. Furthermore, a second tool guide is provided on the machine frame to guide the tool to a second guide position. The second tool guide can be moved with respect to the machine frame in a second plane along a third direction and a fourth direction which is orthogonal to the third direction, independently of the first tool guide. Finally, a tool holder is provided on the machine frame to hold the machined part. The machined part is led between the first and the second guide positions of the tool. The second tool guide is a movable gantry carrier with a movable second sliding carriage.

Abstract: An electric discharge machining device comprises a base, a support column, an oil bath, a work platform, a draining pipe, and a linear actuator. The base has an oil storage compartment. The oil bath has a receiving space and a drainage hole through which the support column is put. The draining pipe is fitted over the support column such that one end of the draining pipe is connected with the drainage hole and that other end of the draining pipe is in communication with the oil storage compartment. The oil bath is actuated to slide up and down between an upper position and a lower position. When the oil bath is located at the upper position, the bath is filled with the process oil. When the oil bath is located at the lower position, the process oil is drained out of the oil bath into the oil storage compartment of the base.

Abstract: A work tank (20) for an electric discharge machine includes a tank wall (21) having an opening in a front surface and surrounding a workpiece; a front door (31) horizontally movable between an unlock position, where the front door is vertically movable, and a lock position, where the opening is closed in a generally liquid-tight relationship; a pair of brackets (32) attached to both sides of the front door and extending rearwardly; a handle lever (51) capable of pivoting about a fulcrum (35) and supported on at least one of the brackets; and a cam follower, fixed to the handle lever further forward than the pivot, the cam follower being vertically movable between a first position (H1) higher than the fulcrum and a second position (H2) lower than the fulcrum. The cam follower is fitted loosely into a groove (62) extending vertically and formed in a rail block (61). Horizontal movement of the cam follower is restricted.

Abstract: There are described a process for electric discharge machining of a work, which uses deionized water containing no rust preventing agent, as working liquid, and an apparatus therefor. The electric discharge machining apparatus additionally has a high-frequency AC applying device, a grounding electrode and a pair of applying electrodes in which are immersed in the deionized water to alternatively apply high-frequency AC voltage to the applying electrodes for decreasing oxidation-reduction potential of the deionized water.

Abstract: There are provided an upper guide (118) and a lower guide (109) which are respectively disposed above and below a workpiece (25) and respectively incorporate wire guides for guiding a wire electrode (119); a nozzle for jetting and supplying a working fluid from at least one of the upper guide (118) and the lower guide (109) toward the workpiece (25); and a pump for supplying the working fluid to the nozzle, so that a gas is mixed into the working fluid in a channel of the working fluid from the pump to the nozzle, and the working fluid in a state of a gas-liquid mixed phase is jetted and supplied from the nozzle to the workpiece (25).

Abstract: An electric discharge machine includes a machine base configured to support a work piece, a y-axis alignment assembly having a first direction of travel and mounted to the machine base, and an electrode alignment assembly mounted to the machine base and configured to hold an electrode during a machining process. The electrode alignment assembly has a second, a third, and a fourth direction of travel, and an attached rotary indexer has a fifth direction of travel. Movements in the first, second, third, fourth, and fifth directions of travel are automatically controlled by a processor.

Abstract: A wire electrical discharge machine having an upper wire guide and a lower wire guide through which a wire electrode is passed and which have therein channels for the working fluid to flow therethrough, including: ajet nozzle which is engaged with and fixed to an outer peripheral surface of a distal end portion of the upper wire guide, and is adapted to guide the wire electrode to a hole in the lower wire guide through use of the fluid; a working fluid nozzle for covering the jet nozzle and having a through hole in a central portion thereof and a collar portion in a periphery thereof; a retaining plate for fixing an outer peripheral portion of the working fluid nozzle including the collar portion, and the retaining plate having a channel for supplying and discharging the fluid; and a sealed space portion which is disposed between the collar portion of the working fluid nozzle and the retaining plate and expands and contracts due to the fluid which flows in or out through the channel.

Abstract: An apparatus for perforating a film has one or more electrodes in electrode holders to lightly contact the film, a return electrode to support the film, and a voltage coupler to produce a discharge between the electrodes to perforate the film. A water jet sprayer is mounted on an electrode holder to provide a jet of water where the electrodes come into contact with the film.

Abstract: The machining liquid (7) comprises a load (9) of particles contained in a dielectric liquid (8). The particles are carbon microfibers (10), sectioned or not, having a diameter (e) comprised between 0.2 and 8 micrometers and a length (l) which is a function of the machining gap (G) provided between the electrode-tool (5) and the electrode-workpiece (6). Thanks to this load of carbon microfibers of well-defined dimensions and geometry, the electro-erosion output, the precision of machining, the condition of the surface obtained and the ability to replicate machining performances, are considerably improved.

Abstract: A flushing device having therein a chamber into which dielectric fluid is supplied for injecting dielectric fluid into a machining gap formed between a workpiece being machined and a wire electrode in a wire-cut electric discharge machine, a nozzle movable between a first position and a second position that is nearer the workpiece than the first position, for directing the dielectric fluid in the chamber toward the machining gap; and a spring or other bias apparatus for holding the nozzle in the first position.

Abstract: An intermediate electrode guide is disposed between an electrode guide and an electrode holder. An intermediate electrode chuck of rubber elastic body is provided on the intermediate electrode guide. The intermediate electrode chuck has an insertion hole. The hole is enlarged when a fine hole machining electrode is inserted therein so as to facilitate such insertion. On the other hand, a diameter of the hole is lessened by driving a piston when feeding the electrode or machining the workpiece. Thus, the electrode is grasped by the intermediate chuck. The chuck and the electrode are rotated via bearings 13 and 19 so as to prevent shift of the electrode.

Abstract: An electric discharge device 9 is provided for removing material from a workpiece 5 to form a through hole 5b therein. The electric discharge device 9 is designed to maintain the pressure of processing liquid after the hole 5b extends through the workpiece 5 to thereby stabilize the electric discharge during the hole forming process. Basically, the electric discharge device 9 includes a movable discharging electrode 10, an arc voltage discharging device 11, a processing liquid supply mechanism 13 and an indexing mechanism 15. The arc voltage charging device 11 supplies current at a predetermined voltage between the discharging electrode 10 and a workpiece 5. An electrode reciprocating mechanism 12 moves the discharging electrode 10 towards and away from the workpiece. The processing liquid supply mechanism 13 is fluidly coupled to an internal bore 10a of the discharging electrode 10 for supplying processing liquid inside the discharging electrode 10.