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1、课程：特种加工电火花加工ELECTRICALDISCHARGEMACHINING译：曾云龙学号：200807024133HistoryIn1770,EnglishphysicistJosephPriestleystudiedtheerosiveeffectofelectricaldischarges.FurtheringPriestley'sresearch,theEDMprocesswasinventedbytwoRussianscientists,Dr.B・R・LazarenkoandDr.N・I.Lazarenko,in1943・Intheireff
2、ortstoexploitthedestructiveeffectsofanelectricaldischarge,theydevelopedacontrolledprocessformachiningofmetals.Theirinitialprocessusedasparkmachiningprocess,namedafterthesuccessionofsparks(electricaldischarges)thattookplacebetweentwoelectricalconductorsimmersedinadielectricfluid・Th
3、edischargegeneratoreffectusedbythismachine,knownastheLazarenkocircuit,wasusedformanyyearsintheconstructionofgeneratorsforelectricaldischarge・Additionalresearchersenteredthefieldandcontributedmanyfundamentalcharacteristicsofthemachiningmethodweknowtoday.In1952」hemanufacturerCharmil
4、lescreatedthefirstmachineusingthesparkmachiningprocessandwaspresentedforthefirsttimeattheEuropeanMachineToolExhibitionin1955.In1969Agielaunchedtheworld'sfirstnumericallycontrolledwire-cutEDMmachine.SeibudevelopedthefirstCNCwireEDMmachine1972andthefirstsystemmanufacturedinJapan・Typ
5、esSinkerEDMSinkerEDM,alsocalledcavitytypeEDMorvolumeEDM,consistsofanelectrodeandworkpiecesubmergedinaninsulatingliquidsuchas,moretypically,oilor,lessfrequently,otherdielectricfluids・Theelectrodeandworkpieceareconnectedtoasuitablepowersupply.Thepowersupplygeneratesanelectricalpoten
6、tialbetweenthetwoparts.Astheelectrodeapproachestheworkpiece,dielectricbreakdownoccursinthefluid,formingaplasmachannel,andasmallsparkjumps.Thesesparksusuallystrikeoneatatimebecauseitisveryunlikelythatdifferentlocationsintheinter-electrodespacehavetheidenticallocalelectricalcharacte
7、risticswhichwouldenableasparktooccursimultaneouslyinallsuchlocations.Thesesparkshappeninhugenumbersatseeminglyrandomlocationsbetweentheelectrodeandtheworkpiece.Asthebasemetaliseroded,andthesparkgapsubsequentlyincreased,theelectrodeisloweredautomaticallybythemachinesothattheprocess
8、cancontinueuninterrupted.Severalh
