英语作业 电火花加工ppt课件

讲解员：范壮壮,Electricaldischargemachining,1,Content,TheconceptoftheEDM,1,TheprincipleoftheEDM,2,ThecharacteristicsoftheEDM,3,DevelopmentdirectionofEDM,4,2,1TheconceptoftheEDM,Electricaldischargemachiningisaspecialprocessingmethod,whichisusedtoresisttheelectricalerosioncausedbythepulsedischargebetweentwoelectrodesintheworkingfluid.Itisalsoknownasthedischargemachiningorelectricaletchingprocess,whichiscalledEDM电火花加工是利用浸在工作液中的两极间脉冲放电时产生的电蚀作用蚀除导电材料的特种加工方法，又称放电加工或电蚀加工，英文简称EDM,3,2TheprincipleoftheEDM,Ininsulatingworkingfluid,generatingapulseofthesparkdischargebetweenthetoolandtheworkpiece,producinginstantaneoushightemperatureandthemeltingoffthesurfaceoftheworkpiece,toachievethepurposeofthemetalsurfaceisprocessed.在绝缘工作液中，工具与工件间产生脉冲性火花放电，产生局部瞬时高温，使工件熔化而抛离工件表面，达到金属表面被加工的目的。,4,11,电火花加工原理图,5,Theworkpieceandtoolarerespectivelyconnectedwiththetwoinputendofpulsepowersupply,automaticfeedadjustmentdevicetomakethetoolandtheworkpieceoftenmaintainasmalldischargegap,whenthepulsevoltageisappliedtothetwopoles,inthatcaseandattherelativeminimumofagaporatthelowestinsulationstrengthwhichthedielectricispunctured，thenproducingsparkanddischarge,whenintheinstantaneoushightemperature，asmallportionofthemetalofthetoolandtheworkpieceareremoved，eachformasmallpit.Nexttheprocessrepeatsandrepeats.,6,工件和工具分别与脉冲电源的两输入端相连接。自动进给调节装置使工具和工件经常保持一个很小的放电间隙，当脉冲电压加到两极之间时，便在当时条件下相对某一间隙最小处或绝缘强度最低处击穿介质，在该局部产生火花放电，瞬时高温时工具和工件表面都蚀除掉一小部分金属，各自形成一个小凹坑,接下来该过程重复发生。,7,3ThecharacteristicsoftheEDM,1、Forhigh-hardnessconductivematerialprocessing.2、Easytoprocessslender,thin,brittlepartsandcomplexparts3、Workpiecedeformationsmall,high-precisionmachining4,Easytorealizetheautomationofmachiningprocess,advantage,8,用于加工高硬度导电材料。便于加工细长、薄、脆性零件和形状复杂的零件。工件变形小，加工精度高。易于实现加工过程的自动化,9,1Conductivematerialcanonlybeprocessed.2Machiningaccuracyislimitedbythelossofelectrode3Processingspeedisslow4Theminimumradiusoffilletislimitedbythedischargegap.,disadvantages,10,只能对导电材料进行加工。加工精度受到电极损耗的限制。加工速度慢。最小圆角半径受到放电间隙的限制。,11,4Develo