US3287537A - Machining by sparking - Google Patents

Machining by sparking Download PDF

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Publication number
US3287537A
US3287537A US323043A US32304363A US3287537A US 3287537 A US3287537 A US 3287537A US 323043 A US323043 A US 323043A US 32304363 A US32304363 A US 32304363A US 3287537 A US3287537 A US 3287537A
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United States
Prior art keywords
electrodes
workpiece
machining
separate
spark
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Expired - Lifetime
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US323043A
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English (en)
Inventor
Chenel Pierre Marcel Rene
Nedelec Maurice
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Compagnie de Saint Gobain SA
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Compagnie de Saint Gobain SA
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Application filed by Compagnie de Saint Gobain SA filed Critical Compagnie de Saint Gobain SA
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Publication of US3287537A publication Critical patent/US3287537A/en
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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
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
    • B23H7/18—Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
    • 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

Definitions

  • the present invention relates to improvements in sparking, for the formation of orifices, in general of small section, in metallic members.
  • the invention involves the perforation of metallic parts by making electric sparks jump between an electrode andthe part to be machined, the electrode and the part being immersed in a suitable liquid.
  • the invention has the particular objective of simultaneously forming a large number of orifices of the same diameter within as short a time as possible.
  • the apparatus effecting the displacement of the electrodes is subject to the control of the actuating means therefor in such a way that the distance between the electrodes and the part to be machined is controlled and kept at every moment at a suitable value.
  • a vibratory motion is given to the member carrying the groups of electrodes at the start of the piercing operation. It has been determined that there is thus obtained a favorable efiect, which seems to be due to the fact that this vibratory motion allows a better evacuation of the metallic residue resulting from the piercing operation.
  • the invention also contemplates application of the improvements described above, in whole or in part, to the production of orifices of very small diameter in a metallic wall having for its special objective the formation of extrusion orifices to obtain filaments and fibers from plastic materials.
  • the invention is concerned in particular with the obtention of orifices of very small diameter in the annular bands or walls which constitute the peripheral part of the rotating bodies utilized in the production of filaments or fibers by centrifugal projection of viscous plastic material through these orifices.
  • FIG. 1 is a schematic illustration including a circuit diagram of a preferred embodiment which is given by way of example, and which is not to be construed as limiting;
  • FIG. 2 is a sectional view of a rotary body having a peripheral wall corresponding to the workpiece shown in FIG. 1.
  • the piece to be machined or pierced is mounted on an insulated support 2 and is placed in a vat or tank 3 filled with a dielectric liquid.
  • the electrodes are arranged in two distinct groups 4 and 5 mounted on a common insulating support 6.
  • This support is integral with a head 7 which is connected, by an appropriate mechanical transmission 8, to a reversible direct current motor 9 capable of opposite directions of rotation.
  • This control allows the ensemble of electrodes to be raised or lowered according to the direction of rotation of the motor.
  • a vibrator 24 is fixed on head 7.
  • the current supply to the ensemble of the device is obtained from a source of continuous current which may be connected between terminals 10 and 11.
  • the two groups of electrodes 4 and 5 are connected independently to circuits comprising, respectively, condensers 12 and 13, the discharge from which effects the sparking. These circuits are supplied by the continuous current source through the intermediary of resistances 22 and 23, respectively.
  • the armature9a of motor 9 is connected to the circuit of each group of electrodes by means of resistances 14 and 15, shunted by diodes 16 and 17, respectively.
  • the diodes 16 and 17 function as electric valves by presenting an almost zero resistance for one direction of passage of the current and a very high resistance for the other direction.
  • the armature 9a is also connected to a point 18 of a potentiometer 19 which is connected to the current supply 10, 11 by resistances 20 and 21.
  • the direction of connection of the motor is such that the electrode carrier 7 descends if the potential of the electrodes is lower than that of point 18, which corresponds to the case where the two groups of electrodes are separated from the part to be machined.
  • the motor turns in the opposite direction, thereby effecting the ascent of the electrode carrier or support.
  • the electrodes are preferably subjected to vibrations by means of a vibrator mounted on the electrode carrier.
  • a vibrator mounted on the electrode carrier.
  • the vibrator can be dependent on any desired time-controlled device.
  • a synchronous motor may be used which starts rotation at the beginning of the sparking operation and which advances a cam through the intermediary of a speed-reducing mechanism. This cam establishes the power supply for the vibrator at the start of the operation and acts to cut off this supply at the end of a predetermined time.
  • the assembly can be completed by a relay which acts on point 18 of the connection of the armature of motor 9 to the potentiometer 19 to control the rotation of the motor in the direction corresponding to the ascent of the electrodes, which has the efiect of withdrawing the electrodes from the holes already formed and of removing the waste.
  • FIG. 2 shows a rotary body or centrifuge 40 having a peripheral wall 41 in which is adapted to be formed a plurality of orifices 42 of very small diameter at a plurality of levels, for example, nine, by the displacement of the workpiece relative to the electrodes 4 and 5.
  • Such apertured rotary bodies are well known in the prior art, as exemplified by U.S. Patent No. 3,205,055, September 7, 1965.
  • a single source of supply is utilized for the ensemble of the groups of electrodes. Electrically independent sources may also be utilized for providing the power supply.
  • said direct current electric motor includes an armature, connections from each separate set of electrodes to said armature, each comprising in said voltage-dropping impedance a resistance and a diode in parallel thereto functioning as an electric valve to bridge the short-circuit occasioned by the contact of the ends of one set of electrodes with the workpiece with the motor armature so that the latter rotates in a direction to back off the ends of the electrodes from the workpiece.
  • An apparatus as set forth in claim 3 including vibrating means connected to said electrode carrier.
  • An apparatus as set forth in claim 3 including vibrating means for said electrode carrier, and a timer control for operating said vibrating means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US323043A 1962-11-15 1963-11-12 Machining by sparking Expired - Lifetime US3287537A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR915513A FR1347762A (fr) 1962-11-15 1962-11-15 Perfectionnements à l'usinage par étincelage

Publications (1)

Publication Number Publication Date
US3287537A true US3287537A (en) 1966-11-22

Family

ID=8790858

Family Applications (1)

Application Number Title Priority Date Filing Date
US323043A Expired - Lifetime US3287537A (en) 1962-11-15 1963-11-12 Machining by sparking

Country Status (8)

Country Link
US (1) US3287537A (xx)
BE (1) BE639791A (xx)
CH (1) CH419379A (xx)
ES (1) ES293560A1 (xx)
FI (1) FI41679B (xx)
FR (1) FR1347762A (xx)
GB (1) GB1031806A (xx)
NL (1) NL300499A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472994A (en) * 1966-07-15 1969-10-14 Elox Corp Electrical discharge machining apparatus for multiple electrodes
US3485992A (en) * 1968-01-22 1969-12-23 Kurt H Sennowitz Multiple electrode servo feed control circuit for electrical discharge machining apparatus
US3496321A (en) * 1966-07-15 1970-02-17 Elox Corp Electrical discharge machining apparatus for multiple electrodes
US3833785A (en) * 1973-07-02 1974-09-03 Cammann Mfg Co Electrode movement control
EP1645659A1 (en) * 2003-06-11 2006-04-12 Ishikawajima-Harima Heavy Industries Co., Ltd. Method for repairing machine part, method for forming restored machine part, method for manufacturing machine part, gas turbine engine, electric discharge machine, method for repairing turbine component, and method for forming restored turbine component
US20100243612A1 (en) * 2007-12-04 2010-09-30 Rolls-Royce Plc Electrical discharge machining

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550366A (en) * 1946-10-25 1951-04-24 Meaker Method and apparatus for electroperforating sheet material
US2753429A (en) * 1953-02-25 1956-07-03 Elox Corp Michigan Electrical discharge machining
US2783411A (en) * 1955-12-09 1957-02-26 Elox Corp Servo feed for multiple electrodes
US2901588A (en) * 1956-04-17 1959-08-25 Elox Corp Michigan Method and apparatus for automatic electric discharge maching
US2969482A (en) * 1956-10-08 1961-01-24 Centre Nat Rech Scient Machining systems making use of intermittent electrical discharges

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550366A (en) * 1946-10-25 1951-04-24 Meaker Method and apparatus for electroperforating sheet material
US2753429A (en) * 1953-02-25 1956-07-03 Elox Corp Michigan Electrical discharge machining
US2783411A (en) * 1955-12-09 1957-02-26 Elox Corp Servo feed for multiple electrodes
US2901588A (en) * 1956-04-17 1959-08-25 Elox Corp Michigan Method and apparatus for automatic electric discharge maching
US2969482A (en) * 1956-10-08 1961-01-24 Centre Nat Rech Scient Machining systems making use of intermittent electrical discharges

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472994A (en) * 1966-07-15 1969-10-14 Elox Corp Electrical discharge machining apparatus for multiple electrodes
US3496321A (en) * 1966-07-15 1970-02-17 Elox Corp Electrical discharge machining apparatus for multiple electrodes
US3485992A (en) * 1968-01-22 1969-12-23 Kurt H Sennowitz Multiple electrode servo feed control circuit for electrical discharge machining apparatus
US3833785A (en) * 1973-07-02 1974-09-03 Cammann Mfg Co Electrode movement control
EP1645659A1 (en) * 2003-06-11 2006-04-12 Ishikawajima-Harima Heavy Industries Co., Ltd. Method for repairing machine part, method for forming restored machine part, method for manufacturing machine part, gas turbine engine, electric discharge machine, method for repairing turbine component, and method for forming restored turbine component
EP1645659A4 (en) * 2003-06-11 2008-09-17 Ihi Corp METHOD FOR REPAIRING A MACHINE COMPONENT, METHOD FOR MAKING A RECYCLED MACHINE COMPONENT, METHOD FOR PRODUCING A MACHINE COMPONENT, GAS TURBINE ENGINE, SPARK EROSION MACHINE, METHOD FOR REPAIRING A TURBINE COMPONENT AND METHOD FOR FORMING RECOVERED TURBINE COMPONENTS
US7723636B2 (en) 2003-06-11 2010-05-25 Ishikawajima-Harima Heavy Industries Co., Ltd. Method for repairing machine part, method for forming restored machine part, method for manufacturing machine part, gas turbine engine, electric discharge machine, method for repairing turbine component, and method for forming restored turbine component
US20100243612A1 (en) * 2007-12-04 2010-09-30 Rolls-Royce Plc Electrical discharge machining

Also Published As

Publication number Publication date
FI41679B (xx) 1969-09-30
DE1440976B1 (de) 1972-07-27
CH419379A (fr) 1966-08-31
NL300499A (xx)
FR1347762A (fr) 1964-01-04
BE639791A (xx)
ES293560A1 (es) 1964-04-16
GB1031806A (en) 1966-06-02

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