GB788366A - Improvements in and relating to electric arc machining apparatus - Google Patents

Improvements in and relating to electric arc machining apparatus

Info

Publication number
GB788366A
GB788366A GB13358/55A GB1335855A GB788366A GB 788366 A GB788366 A GB 788366A GB 13358/55 A GB13358/55 A GB 13358/55A GB 1335855 A GB1335855 A GB 1335855A GB 788366 A GB788366 A GB 788366A
Authority
GB
United Kingdom
Prior art keywords
triode
condenser
grid
anode
workpiece
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
GB13358/55A
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.)
Elox Corporation of Michigan
Original Assignee
Elox Corporation of Michigan
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 Elox Corporation of Michigan filed Critical Elox Corporation of Michigan
Publication of GB788366A publication Critical patent/GB788366A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

788,366. Machining by spark discharge. ELOX CORPORATION OF MICHIGAN. May 9, 1955 [Oct. 1, 1954], No. 13358/55. Class 83 (4). Apparatus for machining a workpiece 10 by electric spark discharge between the workpiece and an electrode 12 comprises a condenser 16 across the spark gap, which is charged through a variable resistor whose resistance is varied automatically and means 82 for limiting the maximum voltage across the gap to a value substantially less than that of the power source. The resistor preferably comprises a triode 44 whose anode 42 is connected to a full-wave rectifier 28, fed from one secondary winding 24 of a supply transformer 18, and whose cathode 48 is connected to workpiece 10, condenser 16 and through a rectifier 82 with the centre tap of the secondary winding. The latter is connected at 86 to the output of a rectifier 26 fed from a further secondary winding 22. The grid 60 of triode 44 has a grid leak resistor 62 and is connected through condenser 64 with the anode 66 of a control triode 68 which anode is supplied with current through resistor 70. Grid 78 is connected to a voltage source 80 and cathode 72 is connected to workpiece 10 and network 74, 76 in parallel with condenser 16. When condenser 16 discharges across the gap, triode 68 is caused to conduct and the reduced voltage thereby produced on its anode acts on grid 60 to bias valve 44 to cut-off. Current flows from condenser 76 to condenser 16 and after a delay sufficient for the spark gap to become de-ionized, grid 78 becomes gradually more negative and reduces current flow through triode 68 thereby increasing the voltage on its anode and on the grid of triode 44 causing the latter to conduct and re-charge the condenser 16. A pair of separate transformers may be used instead of the windings 22, 24. In practice a bank of up to one thousand triodes 44 may be used to conduct the charging current, one control triode 68 being used for each fifty or sixty charging triodes. In another embodiment, Fig. 4 (not shown) the control triode 68 is omitted. Means may be provided for rendering triode 44 non- conductive if a short circuit occurs across the spark gap. A dielectric fluid is maintained in the spark gap which may be kept constant or the electrode may be vibrated.
GB13358/55A 1954-10-01 1955-05-09 Improvements in and relating to electric arc machining apparatus Expired GB788366A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US459703A US2804575A (en) 1954-10-01 1954-10-01 Arc machining apparatus with periodic power control

Publications (1)

Publication Number Publication Date
GB788366A true GB788366A (en) 1958-01-02

Family

ID=23825835

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13358/55A Expired GB788366A (en) 1954-10-01 1955-05-09 Improvements in and relating to electric arc machining apparatus

Country Status (6)

Country Link
US (1) US2804575A (en)
CH (1) CH334396A (en)
DE (1) DE1067546B (en)
FR (1) FR1133899A (en)
GB (1) GB788366A (en)
NL (2) NL199986A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829291A1 (en) * 1977-07-07 1979-01-18 Katsuyuki Totsu ELECTRICALLY DRIVABLE FIXED OR. ATTACHMENT OR TIGHTENING DEVICE

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2876386A (en) * 1956-04-12 1959-03-03 Sparcatron Ltd Electric disintegration of conductive materials
FR1166460A (en) * 1956-10-08 1958-11-12 Centre Nat Rech Scient Improvements to processes and devices such as those for machining by intermittent electric discharges
DE1065541B (en) * 1957-02-07 1959-09-17 Tokio Kiyoshi Inoue Switching arrangement for spark erosion with controlled impedance
US2871410A (en) * 1957-06-24 1959-01-27 Elox Corp Michigan Electrical discharge machining watchdog circuit
BE570123A (en) * 1957-08-07
US2951969A (en) * 1957-12-12 1960-09-06 Elox Corp Michigan Edm pulsing circuit
US2979639A (en) * 1958-06-09 1961-04-11 Firth Sterling Inc Pilot pulse spark machining methods and apparatus
US2962630A (en) * 1959-04-13 1960-11-29 Elox Corp Michigan Power feed control
US3059150A (en) * 1959-08-07 1962-10-16 Gen Motors Corp Electric discharge machining apparatus
BE632237A (en) * 1960-03-29
US3213319A (en) * 1960-05-02 1965-10-19 Inoue Kiyoshi Spark discharge machining apparatus with means for clearing short-circuit fusions
US3018411A (en) * 1960-05-03 1962-01-23 Robert S Webb Per pulse cut-off circuit
US3229159A (en) * 1960-05-16 1966-01-11 Elox Corp Michigan Superimposed high striking voltage circuit
US3231782A (en) * 1960-08-30 1966-01-25 Gen Motors Corp Electrical stock removal method and apparatus
US3286127A (en) * 1961-05-18 1966-11-15 Cincinnati Milling Machine Co Electric discharge machining apparatus with current control means
DE1190594B (en) * 1961-08-12 1965-04-08 Deutsche Edelstahlwerke Ag Circuit arrangement for EDM machines
CH414034A (en) * 1964-03-14 1966-05-31 Charmilles Sa Ateliers Intermittent electrical discharge machining process
US3409756A (en) * 1965-01-27 1968-11-05 Union Carbide Corp Metal arc working
US4516009A (en) * 1978-06-14 1985-05-07 Inoue-Japax Research Incorporated Capacitor-type HF power supply for electrical machining
JPS6014653B2 (en) * 1980-02-26 1985-04-15 株式会社井上ジャパックス研究所 Electric discharge machining equipment

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495301A (en) * 1950-01-24 Voltage regulator
US2310092A (en) * 1935-05-17 1943-02-02 Westinghouse Electric & Mfg Co Electric discharge apparatus
US2483691A (en) * 1940-01-06 1949-10-04 Raytheon Mfg Co Condenser welding system
US2515634A (en) * 1942-03-14 1950-07-18 Raytheon Mfg Co Electrical system
US2614076A (en) * 1949-09-16 1952-10-14 Shell Dev Grease compositions
US2628330A (en) * 1951-11-14 1953-02-10 Method X Company Condenser-charging system for spark-cutting devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829291A1 (en) * 1977-07-07 1979-01-18 Katsuyuki Totsu ELECTRICALLY DRIVABLE FIXED OR. ATTACHMENT OR TIGHTENING DEVICE

Also Published As

Publication number Publication date
FR1133899A (en) 1957-04-03
CH334396A (en) 1958-11-30
NL94837C (en)
DE1067546B (en) 1959-10-22
NL199986A (en)
US2804575A (en) 1957-08-27

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