US2796509A - Means for electro-erosion - Google Patents

Means for electro-erosion Download PDF

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Publication number
US2796509A
US2796509A US474304A US47430454A US2796509A US 2796509 A US2796509 A US 2796509A US 474304 A US474304 A US 474304A US 47430454 A US47430454 A US 47430454A US 2796509 A US2796509 A US 2796509A
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United States
Prior art keywords
discharge
electrode
capacitor
workpiece
tool electrode
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Expired - Lifetime
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US474304A
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English (en)
Inventor
Blake Leslie Reginald
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British Thomson Houston Co Ltd
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British Thomson Houston Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
    • B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train

Definitions

  • This invention relates to apparatus for the working of material, particularly material of great hardness, by removing particles of it from the surface, utilising repeated electric discharges which act similar to the cutting effect of one or more sharp edges of a conventional tool.
  • machining by electro-erosion has many advantages.
  • the tool electrode and its operating'head are of light weight, and results can be achieved which are not possible with ordinary methods, for instance holes of irregular cross sectional shape, or with curved axes can be drilled, or complex patterns can be engraved with a suitably shaped'tool electrode.
  • little or no mechanical or thermal stresses are set up by electro-erosion, and the work piece is left in a condition which is more strain-free than can be achieved with other methods.
  • the tool electrode can vibrate or rotate and may perform machining operations which are equivalent to drilling, milling, grinding, sawing and other conventional machining.
  • the present invention aims at an improved apparatus of this kind which is particularly suitable to be employed for high power output and machining rates.
  • the invention also makes it possible to use simple control means, and affords a high charging efiiciency.
  • this invention resides in apparatus for machaning by repeated electric discharges between tool and Work piece electrodes, comprising a capacitance device connected between the tool and work piece, an inductance device through which the capacitance device is charged from a source of electric power to supply the discharges, a vibrator for varying over a given range and in repeated succession the distance between the tool and work piece, the range including the distance at which the discharges occur at a predetermined voltage of the capacitance device as required, the charging circuit and the vibrator being synchronised to ensure coincidence of said voltage and distance, a means for feeding to the discharge gap a scavenging fluid for removing the particles eroded from the electrodes, and an automatic progressing means which is controlled independently of the voltage across the discharge gap to produce an automatic progressive motion reducing the distance between the tool and work piece, thereby to maintain substantially constant the mean length of the discharge path, while particles are eroded and removed from the electrode surfaces.
  • Such apparatus can be supplied from direct, current or alternating current sources, the removal compared with a reference voltage.
  • Fig. 1 is a schematic representation of apparatus of conventional design using a resistance charging circuit for the capacitor and electronic control for the automatic progressing means;
  • Fig. 2 is a diagram of the capacitor voltage obtaining with such an arrangement
  • FIG. 3 shows diagrammatically a form of apparatus according to the invention
  • Fig. 4 shows another embodiment
  • Fig. 5 shows the voltage graph of the capacitance device
  • Figs. 6 and 7 show embodiments substantially similar to Fig. 3, and adapted for supply from an alternating current source;
  • Fig. 8 shows capacitance voltage and current curves obtaining in the resonant circuit when no discharge occurs
  • Fig. 9 shows the shape of these curves when discharges occur in the apparatus of Figs. 6 and 7;
  • Fig. 10 shows a variation of the combined vibrator and induction device.
  • a scavenging fluid which may be an electrolyte, but is preferably a dielectric material, such as a hydrocarbon, is fed to the discharge path so as to remove the eroded particles.
  • the sparking distance between the electrodes approximately 0.001 to 0.005 inch for discharge voltages of 30 to 200 volts-is maintained by an electronic servo mechanism 5 supplied through an amplifier 6 whose input is dependent upon the voltage across the discharge gap as The latter can, be obtained from a potentiometer 8 having its ends 7 connected to a steady direct current source and its movable contact 9 connected to the work piece as shown. It will be understood that the sparking distance, discharge voltage and discharge repetition rate can be controlled by the setting of the reference voltage through the potentiometer.
  • a further disadvantage is that after the discharge a shortcircuit path may exist between the electrode and work piece for a period which is not negligible, causing delays in the charging operation, and non-uniformity in the peaks of the capacitor voltage at which discharge takes place.
  • such apparatus including aninductance device in the, charging circuit, a. means .for
  • an inductance. device 10 comprising the energising coil of. an electromagnet.13..forming,part of.-a mechanical.
  • The: charging circuit now. including inductance and capacitance has a natural resonance frequency- :1
  • the mechanicalv vibrationsand the natural frequencyof thevibrating system are related to-.this charging. frequency, the. frequency of the vibrations being preferably twice the. chargingfrequency. Furthermore, the-phase relation-is such that- .the. capacitance device is charged to a predetermined voltage when, dueto the vibrating'mo tion, the gap; which determines the-discharge path, passes through a conditionalvalue at which it will break down at the said predetermined voltage.
  • the mechanical bias of-theelectrode-tool towards the workpiece and the pro-- gressingfeed ;of the electrode is obtainedby gravity-action usingasuitableportion of the weight. of a headcarrying-- the tooland vibratingmechanis'm, theremaining portion of. the. weight being-counterbalanced by a. weight" 12.:
  • a manual control (not shown in the drawings), of'the tool head as is known in the artycan be provided-to override; the control by the automatic progressing. means.
  • the capacitance value. of 3', the-frequency of the vibrator and the weight-12 which determines thebiasing force can be made adjustableby simple means. It, should also benotedthat although contact-betweenythe electrode and 'work piece must take place when the electrodehits the work piece the contact period is-extreme1yshort owing to the immediate reboundingetfect. Furthermore it does practi-callynot reduce the. charging efficiency since at the beginningof the charging period the actual charging current is kept at a low value by the. inductance device .in the charging circuit.
  • the simplest way. of. triggeringthedischarge at thisinstant is to .vibrate the electrode at .twice the.frequency of the chargingcircuit, and insuch phase relation thereto that the electrode approaches the workpiece. tobe at dis-. charge or sparking distancewhen the capacitance .device. attains or is near its peak voltage. As the electrode.
  • the device is substantiallydischarged before the electrode contacts'the workpiece, and'it rebounds immediately therefrom, its movement being similar to that of a -pneucuitcouldserveas.
  • the mechanical vibrator a combined inductancedevice-electromagnetic vibrator unit which .can readily be locked in phase with the charging circuit as shown in Fig. 3 is presentlypreferred,
  • the tool 1 is carried by an armature 15. which is biased away from the magnet by a spring, preferably a leaf spring, which renders the constructioncompact and efficient.
  • the core 13 can have :two legseach carrying. aportion of. the winding 10, as in Fig. 4, or, asshown inFig. 10, a
  • three-legged core 13a may be usedwhich carries a single winding 10a on its centre leg.
  • the naturalfrequencyj" of.the vibrating system now depends uponits mass and. the. stiffness offthe spring. Obviously the attracting forcevaries; with the magnetic force whose frequency fma. is
  • a switching means such-as'a currentresponsive circuitbreakeror contactor 16 can be connected'to interrupt'at 17. the. F charging circuit if- -'the period of contact betweenthe tool and work piece is continued, and undesirable short circuit conditions arise. Immediately after interruption the contactor recloses and momentary heavy current in coil a pulls the tool away from the work piece. Thus a short circuit is cleared within a few milliseconds, thereby to prevent undesirable fusion which would be liable to cause the tool electrode to adhere to the work piece and would interfere with the smooth operation of the tool which requires constant vibration. Power stored during this period in the charging inductance device is released thereafter to the capacitance device. For normal operation of the embodiment shown in Fig. 3 the V value follows the curve of Fig. 5.
  • the direct current embodiment as shown in Fig. 3 can be supplied from an alternating current source via a rectifier, and, since the efficiency of apparatus according to the invention is very high, the size of such a rectifier, and of a transformer if used in conjunction therewith, is small as compared with the equipment required for conventional apparatus.
  • the invention also enables the operation of electro-erosion apparatus from an alternating current supply source without the intermediary of a rectifier.
  • the charging circuit of such apparatus as shown in Fig. 6, for instance, including capacitance device 3 and inductance devices 10 and 10 is oscillatory and, as indicated in Fig. 8, the voltage V and current I of the capacitance device build up in oscillatory fashion until discharge occurs.
  • the charging circuit is now tuned to the frequency of the supply so that the charging frequency substantially equals the supply frequency, and the vibrator can also be synchronised to this frequency.
  • the vibrator comprises an electromagnet supplied from the same supply system polarization using a permanent magnet or a rectifier shunting a coil energised by A. C. is suggested to ensure that discharge occurs at the second voltage peak of the capacitance device, and at the instant when the work piece is positive.
  • the natural frequency of the mechanical system may equal substantially that of the magnetising current, that is the charging frequency, and need not be twice the frequency of the charging circuit as with direct current charging.
  • Fig. 7 employs alternating current charging with a combined inductance device-vibrator unit, similar to the one used in the embodiment of Fig. 3.
  • a polarizing winding 18 energized with direct current, so that the total magnetic flux in the core 13 oscillates at the frequency of the charging circuit.
  • a permanent magnet core can be used to achieve the desired polarization characteristic.
  • the winding 10 is connected in series with another induction coil 10 in the charging circuit to provide the total of the inductance required in that circuit, and the winding It) is shunted by the rectifier, 19 to afford a polarized characteristic of the electromagnetic vibrator.
  • the scavenging fluid is discharged under pressure into the spark gap through separate nozzle means 24 which includes a device, such as a reducing valve 25, for regulating the pressure of the scavenging fluid.
  • This regulable supply of scavenging fluid under pressure affords a means for obtaining a finer adjustment of the gap between the tool electrode 1 and the work piece 2 as the force of the scavenging fluid in the gap upon these members tends to force them apart and can be regulated by the supply of scavenging fluid.
  • a more economical capacitor of higher voltage and less microfarad value can be used if a transformer stepping down the voltage is arranged between the capacitance device 3 and the electrodes 1, 2 and an automatic switching means, which may be of the mechanical or electronic kind, can be arranged to disconnect the transformer during the charging periods of the capacitance device.
  • a spring device or a stalling electric motor can supply or regulate the biasing force of the automatic progressing means.
  • the latter embodiment is illustrated in Fig. 4 in which a stalling motor 20 with an adjustable torque, which can be adjusted by means of a potentiometer 21 independently of the voltage across the gap between the tool electrode and the work, exerts a force which biases the electrode 1 towards the work piece 2 through a suitable drive, such as a pinion 22 in engagement with a rack 23.
  • the scavenging fluid is discharged into the gap through nozzles 24 which may be mounted in any suitable manner independently of the electrode 1.
  • An electromagnetic vibrator could have a moving coil instead of the usual soft iron armature.
  • Apparatus for electrically eroding a workpiece of metal or metallic compound by means of rapidly repeated electric discharges between it and a tool electrode comprising a source of electric power, a capacitor connected to said tool electrode and workpiece to supply the energy of each discharge, a charging circuit for recharging the capacitor from said source after each discharge, said charging circuit having a minimum of ohmic resistance so as to be practically non-resistive and purely inductive, at least a part of its inductance being provided by a coil which serves for energizing in synchronism with the charging cycles of the capacitor an electromagnetic vibrator, said vibrator connected to said tool electrode to decrease and increase the distance between the said electrode and workpiece, thus cyclically varying the resistance in the discharge gap to initiate a discharge of considerable energy therethrough at the end of each recharge of the capacitor, also comprising a first means for feeding a scavenging fluid under pressure to the discharge gap, thereby to remove particles distintegrated by the electric discharges, and a second means producing a
  • Apparatus including a tool electrode for electrically eroding a workpiece of metal or metallic compound by means of rapidly repeated electric discharges between it and said tool electrode comprising a source of electric power, an electromagnetic vibrator for said tool electrode, a capacitor connected to said tool electrode and workpiece to supply the energy of each discharge, a charging circuit for recharging the capacitor from said source after each discharge, said charging circuit having a minimum of ohmic resistance so as to be practically non- Iesistive and purely inductive, a cell for energising said.
  • vibrator being connected to said tool electrode to decrease and increase at a frequency which equals approximately the frequency of the supply source, the distance between the said elec trode and workpiece, thus cyclically varying the resistance in the spark gap to initiate a discharge of considerable energy therethrough at the end of each recharge of the capacitor, and also comprising a first means for feeding a pressure fluid to the discharge gap, for removing therefrom particles disintegrated by the electric discharges, and a biasing means for urging the tool electrode towards the workpiece so as to prevent gap increase by the erosion of material or by the tendency of the pressure fluid to force the tool electrode and workpiece apart, said biasing means operating substantially independent of the fluctuations of the tool electrode voltage.
  • Apparatus for electrically eroding a workpiece of metal or metallic compound by means of rapidly repeated electric discharges between it and a tool electrode comprising a source of electric power, a capacitor connected to said tool electrode and workpiece to supply the energy of each discharge, a charging circuit for recharging the capacitor from said source after each discharge, said charging circuit having a minimum of ohmic resistance so as to be practically non-resistive and purely inductive, at least a part of its inductance being provided by a coil which serves for energizing in synchronism with the charging cycles of the capacitor an electromagnetic vibrator, said vibrator connected to said tool electrode to decrease and increase the distance between the said electrode and workpiece, thus cyclically varying the resistance in the discharge gap to initiate a discharge of considerable energy therethrough at the end of each recharge of the capacitor, and also comprising a means for feeding a scavenging fluid under pressure to the discharge gap, thereby to remove particles disintegrated by the electric discharges, and an electric motor mechanically interconnected with
  • Apparatus for electrically eroding a workpiece of metal or metallic compound by means of a plurality of electric discharges produced in rapid succession between it and a tool electrode said apparatus including an electric supply, a capacitor connected to said tool electrode and workpiece to provide the energy of each discharge, a charging circuit for recharging the capacitor from said source after each discharge, the ohmic resistance of said charging circuit being kept at a minimum so as to render said circuit practically non-resistive and purely inductive, at least a part of its inductance being provided by the energizing coil of an electromagnetic vibrator vibrating in synchronism with the charging cycles of the capacitor, said vibrator being mechanically connected to said tool electrode to decrease and increase the distance between the said electrode and workpiece, whereby cyclical variation in the dischage gap conductivity causes a succession of discharges of considerable energy at the end of each recharge of the capacitor, and also comprising a means for forcing into the discharge gap a scavenging fluid suitable to remove particles disintegrated by the electric discharge
  • Apparatus for electrically working metal or metallic compound using a rapid succession of electric spark discharges between it and a tool electrode comprising an electric supply, a capacitor connected to said tool elec trode and workpiece to provide intensive discharges, a charging circuit for recharging the capacitor from said source after each discharge, said charging circuit being practically non-resistive but purely inductive, including a coil which serves to energize in synchronism with the charging cycles of the capacitor an electromagnetic vibrator, said vibrator reciprocating said tool electrode to decrease and increase the distance between the said electrode and workpiece, for cyclically varying the resistance in the discharge gap to initiate intensive discharges therethrough at the end of each recharge of the capacitor, and also comprising a regulable supply of scavenging fluid under pressure to the discharge gap, suitable for removing particles disintegrated by the electric discharges, and a biasing means for urging the tool electrode towards the workpiece so as to prevent gap increase by the erosion of material or by other tendency to force the tool electrode and workpiece apart, the operation of said biasing means
  • Apparatus for electrically working metal or metallic compound by means of a plurality of successive electric discharges between it and a tool electrode comprising a source of electric power, a capacitor connected to the said tool electrode and workpiece to supply the energy of each discharge, a charging circuit for recharging the capacitor from said source after each discharge, said charging circuit being practically non-resistive and purely inductive, at least a part of its inductance being provided by a coil arranged to energize in synchronism with the charging cycles of the capacitor an electromagnetic vibrator, connected to said tool electrode to decrease and increase the distance between the said electrode and workpiece, thus cyclically varying the discharge gap resistance to initiate high intensity spark discharges therethrough at the end of each recharge of the capacitor, a switch being provided in said capacitor charging circuit and controlled to open automatically if the current exceeds a predetermined value which may cause undesirable fusion of material and obstruction to electrode withdrawal after the current is interrupted, a pressure fluid feed for scavenging the discharge gap and a biasing means for advancing the tool electrode towards
  • Apparatus for working metal or metallic compound by electric sparking between it and a tool electrode comprising a source of electric power, a capacitor connected to it via said tool electrode, and to the workpiece to supply the spark energy, a charging circuit for the capacitor being selected to be practically non-resistive but inductive, and including the energizing coil of an electromagnetic vibrator arranged to operate in synchronism with the charging cycles of the capacitor cyclically to vary the resistance in the discharge gap by changing the distance between the said electrode and workpiece to thereby initiate high intensity spark discharges at the end of each recharge of the capacitor, the tool electrode carried by a leaf spring in such fashion that it depends therefrom at a center point thereof while the ends of said spring are fastened to the electromagnet of the vibrator, and also means for directing a fluid under such pressure to the discharge gap that it scavenges therefrom undesired particles, and a biasing means urging the tool electrode towards the workpiece with a force as required to prevent gap increase by the erosion of material or other tendency, the
  • Apparatus as claimed in claim 7 wherein means including a permanent magnet core is provided to said vibrator for polarizing said vibrator to oscillate at the frequency of the charging circuit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US474304A 1953-12-21 1954-12-09 Means for electro-erosion Expired - Lifetime US2796509A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903556A (en) * 1955-05-17 1959-09-08 Elox Corp Michigan High frequency vibration
US2908799A (en) * 1957-01-31 1959-10-13 British Oxygen Co Ltd Method and apparatus for electric arc erosion
US2908798A (en) * 1957-01-31 1959-10-13 British Oxygen Co Ltd Electric arc cutting
US2967226A (en) * 1958-02-27 1961-01-03 Philips Corp Device for processing metals
US2969482A (en) * 1956-10-08 1961-01-24 Centre Nat Rech Scient Machining systems making use of intermittent electrical discharges
US3028478A (en) * 1956-08-21 1962-04-03 Arnstadt Fernmeldewerk Method and apparatus for reducing contact noises in electrical devices
US3047707A (en) * 1959-07-01 1962-07-31 Philips Corp Device for working metals
US3098150A (en) * 1960-06-13 1963-07-16 Inoue Kiyoshi Spark discharge metal depositing apparatus
US3134011A (en) * 1959-01-13 1964-05-19 Philips Corp Spark erosion machine
US3156808A (en) * 1956-11-20 1964-11-10 Rolls Royce Manufacture of turbine and compressor blades
US3335313A (en) * 1963-01-09 1967-08-08 Philips Corp Spark erosion device with controllable electrode spacing
US3892936A (en) * 1973-02-19 1975-07-01 Mitsubishi Electric Corp Process for electrical discharge shaping and apparatus therefor utilizing different shape wave forms
US3974357A (en) * 1973-03-22 1976-08-10 Mitsubishi Denki Kabushiki Kaisha Process and apparatus for electrical discharge shaping using sequential switching
US4159407A (en) * 1974-03-23 1979-06-26 Rolls-Royce (1971) Limited Methods and apparatus for electrically machining a work piece
US4289947A (en) * 1978-03-02 1981-09-15 Inoue-Japax Research Incorporated Fluid jetting system for electrical machining
US20100243612A1 (en) * 2007-12-04 2010-09-30 Rolls-Royce Plc Electrical discharge machining
DE102009057410A1 (de) * 2009-12-08 2011-06-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Bearbeiten eines Werkstücks
CN106825806A (zh) * 2017-03-29 2017-06-13 江苏大学 一种磁场引导电解电火花复合加工弯孔的装置及方法

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1168346A (en) * 1915-02-20 1916-01-18 Thomson Electric Welding Co Apparatus for electric welding.
US1497071A (en) * 1924-06-10 Spensley s
US2079310A (en) * 1933-10-31 1937-05-04 Joseph W Piercy Mechanism for producing printing plates by electric arcs
US2089213A (en) * 1936-08-03 1937-08-10 Gen Motors Corp Welding
US2306230A (en) * 1942-03-30 1942-12-22 Gen Electric Electric valve translating system
US2363714A (en) * 1943-03-01 1944-11-28 Cutler Hammer Inc Device for control of current impulses
US2372147A (en) * 1942-03-21 1945-03-20 Westinghouse Electric & Mfg Co Resistance welding
US2385665A (en) * 1943-05-31 1945-09-25 Packard Motor Car Co Electrical device
US2451496A (en) * 1946-02-26 1948-10-19 Raytheon Mfg Co Welding system
GB637793A (en) * 1946-09-24 1950-05-24 Boris Romanovitch Lazarenko A method of working metals and other electro-conductive materials and means for applying same
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2628330A (en) * 1951-11-14 1953-02-10 Method X Company Condenser-charging system for spark-cutting devices
US2654256A (en) * 1950-08-23 1953-10-06 Elox Corp Michigan Diaphragm spring reciprocating tool
US2673280A (en) * 1950-02-03 1954-03-23 Herzstark Curt Electrowriter

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497071A (en) * 1924-06-10 Spensley s
US1168346A (en) * 1915-02-20 1916-01-18 Thomson Electric Welding Co Apparatus for electric welding.
US2079310A (en) * 1933-10-31 1937-05-04 Joseph W Piercy Mechanism for producing printing plates by electric arcs
US2089213A (en) * 1936-08-03 1937-08-10 Gen Motors Corp Welding
US2372147A (en) * 1942-03-21 1945-03-20 Westinghouse Electric & Mfg Co Resistance welding
US2306230A (en) * 1942-03-30 1942-12-22 Gen Electric Electric valve translating system
US2363714A (en) * 1943-03-01 1944-11-28 Cutler Hammer Inc Device for control of current impulses
US2385665A (en) * 1943-05-31 1945-09-25 Packard Motor Car Co Electrical device
US2451496A (en) * 1946-02-26 1948-10-19 Raytheon Mfg Co Welding system
GB637793A (en) * 1946-09-24 1950-05-24 Boris Romanovitch Lazarenko A method of working metals and other electro-conductive materials and means for applying same
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2673280A (en) * 1950-02-03 1954-03-23 Herzstark Curt Electrowriter
US2654256A (en) * 1950-08-23 1953-10-06 Elox Corp Michigan Diaphragm spring reciprocating tool
US2628330A (en) * 1951-11-14 1953-02-10 Method X Company Condenser-charging system for spark-cutting devices

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903556A (en) * 1955-05-17 1959-09-08 Elox Corp Michigan High frequency vibration
US3028478A (en) * 1956-08-21 1962-04-03 Arnstadt Fernmeldewerk Method and apparatus for reducing contact noises in electrical devices
US2969482A (en) * 1956-10-08 1961-01-24 Centre Nat Rech Scient Machining systems making use of intermittent electrical discharges
US3156808A (en) * 1956-11-20 1964-11-10 Rolls Royce Manufacture of turbine and compressor blades
US2908799A (en) * 1957-01-31 1959-10-13 British Oxygen Co Ltd Method and apparatus for electric arc erosion
US2908798A (en) * 1957-01-31 1959-10-13 British Oxygen Co Ltd Electric arc cutting
US2967226A (en) * 1958-02-27 1961-01-03 Philips Corp Device for processing metals
US3134011A (en) * 1959-01-13 1964-05-19 Philips Corp Spark erosion machine
US3047707A (en) * 1959-07-01 1962-07-31 Philips Corp Device for working metals
US3098150A (en) * 1960-06-13 1963-07-16 Inoue Kiyoshi Spark discharge metal depositing apparatus
US3335313A (en) * 1963-01-09 1967-08-08 Philips Corp Spark erosion device with controllable electrode spacing
US3892936A (en) * 1973-02-19 1975-07-01 Mitsubishi Electric Corp Process for electrical discharge shaping and apparatus therefor utilizing different shape wave forms
US3974357A (en) * 1973-03-22 1976-08-10 Mitsubishi Denki Kabushiki Kaisha Process and apparatus for electrical discharge shaping using sequential switching
US4159407A (en) * 1974-03-23 1979-06-26 Rolls-Royce (1971) Limited Methods and apparatus for electrically machining a work piece
US4289947A (en) * 1978-03-02 1981-09-15 Inoue-Japax Research Incorporated Fluid jetting system for electrical machining
US20100243612A1 (en) * 2007-12-04 2010-09-30 Rolls-Royce Plc Electrical discharge machining
DE102009057410A1 (de) * 2009-12-08 2011-06-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Bearbeiten eines Werkstücks
US9004335B2 (en) 2009-12-08 2015-04-14 Continental Automotive Gmbh Method and device for machining a workpiece
CN106825806A (zh) * 2017-03-29 2017-06-13 江苏大学 一种磁场引导电解电火花复合加工弯孔的装置及方法

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CH327378A (de) 1958-01-31
GB749486A (en) 1956-05-23
FR1117550A (fr) 1956-05-23

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