GB774091A - Improvements in machining methods and apparatus making use of intermittent electric discharges - Google Patents

Improvements in machining methods and apparatus making use of intermittent electric discharges

Info

Publication number
GB774091A
GB774091A GB13013/54A GB1301354A GB774091A GB 774091 A GB774091 A GB 774091A GB 13013/54 A GB13013/54 A GB 13013/54A GB 1301354 A GB1301354 A GB 1301354A GB 774091 A GB774091 A GB 774091A
Authority
GB
United Kingdom
Prior art keywords
electrode
workpiece
cutting
fed
potential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB13013/54A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre National de la Recherche Scientifique CNRS
Original Assignee
Centre National de la Recherche Scientifique CNRS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centre National de la Recherche Scientifique CNRS filed Critical Centre National de la Recherche Scientifique CNRS
Publication of GB774091A publication Critical patent/GB774091A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING 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
    • B23H1/00Electrical 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

774,091. Cutting by spark discharge. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE. May 4, 1954 [May 7, 1953], No. 13013/54. Classes 83 (2) and 83 (4). In a method of cutting, piercing or otherwise shaping a workpiece 9 by electric spark discharge between the workpiece and an electrode 8 which are fed with rapid pulsations of unidirectional current through a circuit including an electric energy storing system 4, the potential between the electrode and the workpiece reaches its maximum when the potential at the terminals X, Y, of the unidirectional current source is at its minimum. Alternating current supplied by a generator 1 is fed through a transformer 2, full-wave rectifier 3, which may be an electronic valve or a dry rectifier, and a self-inductance coil 5 to one side of the storing system 4, the other side being fed through a variable resistance 7. A rectifier 6 is used to prevent oscillation of potential across the electrode and workpiece and a thermal ammeter 10 measures the current in the discharge circuit. The storing system may be a condenser, but is preferably a delay network of the kind described in Specification 774,090. Three-phase current with a three-phase rectifier may alternatively be used. The workpiece and electrode are preferably immersed in a liquid such as transformer oil or water and the electrode is adjusted by a screw 16, Fig. 3 (not shown). In an embodiment for cutting a threaded hole in a workpiece 20 the latter is clamped against a plate 17 by jaws 21, 22 and a screw 27 which forms the electrode is mounted in a threaded support 28 and is rotated during the operation so as to gradually move through the workpiece. The electrode may be fed automatically by means responsive to the mean value of the potential difference between the electrode and workpiece. Reference is also made to the cutting of toothed gears. The workpiece may be of tempered steel, titanium, metallic carbides of tungsten, molybdenum cobalt or ferrite materials. The electrode may be of copper or copper alloy.
GB13013/54A 1953-05-07 1954-05-04 Improvements in machining methods and apparatus making use of intermittent electric discharges Expired GB774091A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1010673X 1953-05-07

Publications (1)

Publication Number Publication Date
GB774091A true GB774091A (en) 1957-05-08

Family

ID=9569229

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13013/54A Expired GB774091A (en) 1953-05-07 1954-05-04 Improvements in machining methods and apparatus making use of intermittent electric discharges

Country Status (7)

Country Link
BE (1) BE524289A (en)
CH (1) CH325539A (en)
DE (1) DE1010673B (en)
FR (1) FR1081854A (en)
GB (1) GB774091A (en)
LU (1) LU32492A1 (en)
NL (2) NL93572C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835785A (en) * 1955-01-03 1958-05-20 Firth Sterling Inc Apparatus for spark maching
US2899535A (en) * 1956-04-04 1959-08-11 Krall
DE1181345B (en) * 1956-07-07 1964-11-12 Siemens Ag Arrangement for the electrical discharge machining of metal bodies
DE1690752B1 (en) * 1957-05-15 1969-09-04 Hans J Schulz Ges Fuer Elek Sc Device to prevent the harmful effects of short circuits in spark erosion machines with automatic feed
US3024406A (en) * 1958-04-07 1962-03-06 Elox Corp Michigan Direct current charging circuit

Also Published As

Publication number Publication date
DE1010673B (en) 1957-06-19
FR1081854A (en) 1954-12-23
NL93572C (en)
NL182903B (en)
BE524289A (en)
LU32492A1 (en)
CH325539A (en) 1957-11-15

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