導(dǎo)電加熱切削技術(shù)關(guān)鍵問題研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文導(dǎo)電加熱切削技術(shù)關(guān)鍵問題研究姓名：婁巖申請學(xué)位級別：碩士專業(yè)：機(jī)械制造及其自動化指導(dǎo)教師：徐文驥20080601大連理工大學(xué)碩士學(xué)位論文StudyontheKeyProblemsoftheElectricHotMachiningAbstractForalongtime，thefinishingorsemi—finishingofmanydifficult—to—machinematerialshavetobema

2、chinedbymeansofmillingHowever，themillinghassomedisadvantages，suchaslowefficiency，highconsumedpowerandenvironmentpollutionetcAtpresent，、析ththedevelopmentofsuperhardtools，hardturningCansubstitutethemillingasthefinishing，wh

3、ichishigherefficient，friendtoenvironmentandlessinvestmentButcurrenthardturningneedshighqualitylatheandsuperhardtool，whichmakeitdifficulttoextendSoitprovidestheurgentneedtoapplyanddeveloptheelectrichotmachiningtechnology(

4、EHlVOAsaneffectivemethod，electrichotmachiningCanremarkablyimprovethemachinabilityofhardtomachinematerialsandreducetheroughnessofmachiningsurfaceAlthoughsomeinvestigationshaveshownthatelectrichotmachiningisfeasible，theree

5、xitsomeinevitableproblemsinterferingintheapplicationofEHMSothispapermainlyconcernswithsomekeytechniquesintheapplicationofelectrichotmachiningBasedonthebasictheoryofelectricarc，intheprocessofelectrichotmachining，thespecie

6、sofelectricarCdischargeandtheirdevelopingprinciplesareemphaticallyanalyzedMeanwhile，theformulaofthestabilizingandeliminatingconditionofdirectcurrentaleisderived，andfromwhichthemethodofeliminatingelectricarcispresentedIna

7、ddition，withtheuseofthetransientovervoltagepulsesignalandcurrentsignaldetectedbetweentheendofthetoolandworkpiecetocountandcontrolthepowersupplytobeswitchedoffanewmethodisproposedtopreventfromgeneratingelectricsparkorarci

8、ntheprocessofthetoolretractingfromtheworkpieceFurthermore，itprovedthatthismethodiseffectivetosuppressthedischargeoftheelectricsparkorarcandmakespossibletocutthediscontinuoussurfacebyusingEHMAccordingtothemechanismanalysi

9、sofconventionaltoolwealthewearbehaviorsoftoolsusedinEHMareresearchedbyexperimentsAcomparativeanalysisoffourtypicaltoolmaterialsisalsoperformedintoEHMtoselectoptimumtoolmaterialMeanwhile，withthecontroldevicesofeliminating

10、electricarc，theverificationtestsareperformedandthefinersurfacequalityissteadilyobtained，whichcandecreasethesurfaceroughnessto07umorlowerSotheresultsshowthatelectrichotmachiningCansubstitutethemillingtocutsomehardtomachin