01英语翻译资料03.15

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1、郑州大学机械工程学院机械工程及其自动化专业2000级9班常志军20000139052004-03-15Researchandafewandnewimprovementmeasuresoftheelectricitysparkprocessingtechnology（EDM）Electrical-DischargeMachining(EDM),orsparkmachining,asitisalsocalled,isbasedontheeroding,effectofanelectricsparkonboththeelectrodesusedtoproduceit.Ithasbeenfou

2、ndfromobservationthatifbothelectrodesaremadeofthesamematerial,greatererosionoccursonthepositiveelectrode.Hence,toobtainmaximummetalremovalwithminimumwearonthetoolelectrode,theworkismadethepositiveandthetoolthenegativeelectrode.TheelectricitysparkprocessestheprincipleofthecraftTheessentialconditi

3、onthatelectricitysparkprocess(1)theworkpieceistoconductselectricity.(2)thetoolelectrodewereprocessedwiththeworkpiecethesurfacekeepscertaincleft.Turnonelectricitythecleftroughly0.01mms.Cleftoverbigbrokethroughtoliethequalitydonotproducetoturnonelectricity,cleftoversmallresultintheshortcircuittoal

4、sodoesnotproducetoturnonelectricity.(3)thesparkturnsonelectricitytowanttoproceedinhadcertainlyliquidofinsulatingthefunctionlayquality.(4)thesparkturnsonelectricitytoturnonelectricityforthepulsesparkofthemoment,closetogetherpulsecontainapartition,canmakeinsulatetoliethequality消electricityleave.Tu

5、rnonelectricityeventotaketogiveorgetanelectricshockasoninthepassagecompoundforneutralason,inordertowaitforapulseturnsonelectricity,alsocanavoidthecaloriesproliferationresultsintosufferburns.Theprincipleoftheelectrical-discharge-machiningprocessisillustratedbythesimplifieddiagraminFig.1.thetoolis

6、mountedonthechuckattachedtothemachinespindlewhoseverticalfeediscontrolledbytheservomotorthroughareductiongearbox.Theworkpieceisplacedinatankfilledwithadielectricfluid;adepthofatleast50mm(2in.)overtheworksurfaceismaintainedtoeliminatetheriskoffire.Thetoolandworkpieceareconnectedtoadcrelaxationcir

7、cuitfedfromadcgenerator.Dielectricfluidiscirculatedunderpressurebyapump,usuallythoughahole(orholes)inthetoolelectrode.Asparkgapofabout0.025to0.05mm(0.001to0.002in.)ismaintainedbytheservomotor.Whenthepowersupplyisswitchedon,t