GB939679A - Improvements in or relating to electrolytic erosion processes - Google Patents

Improvements in or relating to electrolytic erosion processes

Info

Publication number
GB939679A
GB939679A GB42335/60A GB4233560A GB939679A GB 939679 A GB939679 A GB 939679A GB 42335/60 A GB42335/60 A GB 42335/60A GB 4233560 A GB4233560 A GB 4233560A GB 939679 A GB939679 A GB 939679A
Authority
GB
United Kingdom
Prior art keywords
voltage
rectifiers
condenser
circuit
ignition
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
GB42335/60A
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.)
Agie Charmilles SA
Original Assignee
Agie Charmilles SA
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 Agie Charmilles SA filed Critical Agie Charmilles SA
Publication of GB939679A publication Critical patent/GB939679A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
    • H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

939,679. Electrolytic machining. AGIE A.G. FUR INDUSTRIELLE ELEKTRONIK. Dec. 8, 1960 [Dec. 9, 1959], No. 42335/60. Clas 41. [Also in Group XXXV] In electrolytic machining, single phase A.C. is rectified and the unsmoothed rectified output is fed to the gap across the electrode and workpiece, thus providing a pulsating D.C. of which the voltage intermittently approaches zero. The circuit preferably includes means to extinguish arcing and sparking. The output of a single phase transformer is taken to a two-way bridge rectifier circuit 2, 3, 4, 5, and the pulsating D.C. is supplied from points 6, 7 to the electrode E and workpiece W. Rectifiers 4, 5 are of thyratron type and firing time is controlled so that pulses fed to the gap are subject to a time-lag, by the network tapped resistance 9<SP>7</SP>, condenser 10 operating as an integrator unit. The ignition of the controlled rectifiers is operated by a double-base transistor 15 of bi-stable characteristic, the adjustable resistor 22 connected to emitter 15a, forming an impulse generator. After supplying the controlled impulse to the rectifiers and discharging condenser 23, this is re-charged via resistor 22, and emitter voltage rises whereas the path between base electrodes 27, 28 becomes conductive. Two rectifiers 16, 17 supply the impulse generator, the connecting points being led to the ignition circuit 20 via a resistor 18. A Zener diode 19 limits the potential rise in this circuit e.g. if A.C. voltage in the transformer secondary rises to 100 V., the Zener diode 19 limits it to about 20 V. If an arc or spark occurs the voltage on condenser 10 drops, the negative potential of voltage source 12 is reduced, and the emitter line of the NPN transistor becomes non conductive, the charging condenser 23 is bridged, and the ignition impulse is delayed.
GB42335/60A 1959-12-09 1960-12-08 Improvements in or relating to electrolytic erosion processes Expired GB939679A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH8162559A CH382324A (en) 1959-12-09 1959-12-09 Switching arrangement for electrolytic erosion with automatic arc and spark suppression

Publications (1)

Publication Number Publication Date
GB939679A true GB939679A (en) 1963-10-16

Family

ID=4538981

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42335/60A Expired GB939679A (en) 1959-12-09 1960-12-08 Improvements in or relating to electrolytic erosion processes

Country Status (6)

Country Link
US (1) US3129357A (en)
CH (1) CH382324A (en)
DE (1) DE1130542B (en)
FR (1) FR1280813A (en)
GB (1) GB939679A (en)
NL (2) NL258860A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192466A (en) * 1961-10-23 1965-06-29 Gen Electric Silicon controlled rectifier circuit employing an r-c phase controlled unijunction transistor firing means connected directly across an alternating supply
CH425031A (en) * 1965-09-21 1966-11-30 Charmilles Sa Ateliers Power source for electrolytic machining machine
US3458726A (en) * 1966-02-14 1969-07-29 Webb James E Power control circuit
US3530270A (en) * 1966-08-30 1970-09-22 Gen Motors Corp Electrical discharge machining apparatus
NL7509529A (en) * 1975-08-11 1977-02-15 Ultra Centrifuge Nederland Nv PROCESS FOR PROCESSING ELECTRICALLY CONDUCTIVE MATERIALS BY ELECTROCHEMICAL DETERMINATION.
DE2944505C2 (en) * 1979-11-03 1985-09-05 Aeg-Elotherm Gmbh, 5630 Remscheid Process for the electrochemical machining of a metal workpiece and device for carrying out this process

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826540A (en) * 1952-09-18 1958-03-11 George F Keeleric Method and apparatus for electrolytic cutting, shaping, and grinding
US2769078A (en) * 1953-02-25 1956-10-30 Elox Corp Michigan Arc machining
GB812012A (en) * 1956-04-12 1959-04-15 Sparcatron Ltd Improvements in the electric disintegration of conductive materials
US2901588A (en) * 1956-04-17 1959-08-25 Elox Corp Michigan Method and apparatus for automatic electric discharge maching
US2887561A (en) * 1956-06-08 1959-05-19 Firth Sterling Inc Control for spark machining apparatus
GB843546A (en) * 1956-08-16 1960-08-04 Gkn Group Services Ltd Improvements relating to spark machining apparatus
LU36326A1 (en) * 1957-08-07
US2951969A (en) * 1957-12-12 1960-09-06 Elox Corp Michigan Edm pulsing circuit
US2951930A (en) * 1958-02-26 1960-09-06 Elox Corp Michigan Pulsed arc machining

Also Published As

Publication number Publication date
DE1130542B (en) 1962-05-30
NL124255C (en)
CH382324A (en) 1964-09-30
US3129357A (en) 1964-04-14
FR1280813A (en) 1962-01-08
NL258860A (en)

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