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ID:36519382
大小:2.23 MB
页数:68页
时间:2019-05-11
《石墨电极电火花加工工艺研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、广东工业大学硕士学位论文石墨电极电火花加工工艺研究姓名:武云霞申请学位级别:硕士专业:机械制造及其自动化指导教师:王成勇20040510广东工业大学工学硕士学位论文AbstractBecauseoftheadvantagessuchaslowerwearratio,rapidmachiningspeed,highheat—resistantandmachiningprecision,graphiteelectrodeisakindofperfectelectrodematerialintheED
2、Mprocessofdieandmould.Inordertoimproveitsuseintheindustry,itisvaluableandimportanttoresearchmachiningtechnologyofgraphiteelectrodeforEDM.Inthisthesis,parametersoptimizedselectionmodelofgraphiteelectrodeforEDMisestablishedbasedontheresearchofEDMcharac
3、teristicsofgraphiteelectrodeandadaptabilityofmachiningtechnologytodifferentEDMmachinetools.Effectsofelectrodepolarity,pulseduration,pulseinterval,open—circuitvoltage,peakcurrent,grainsizeofgraphiteelectrodeandworkpiecematerialonEDMcharacteristicsofgr
4、aphiteelectrodewerestudiedthroughalotofexperimentsandanalysis.EDMcharacteristicsofgraphiteelectrodeweremeasuredonfourEDMmachinetoolsinordertoanalyzeadaptabilityofmachiningtechnologytoEDMmachinetools.EDMmachiningtechnologymodelwithgraphiteelectrodeest
5、ablishedbyBPneuralnetworkwerecarriedout.Theresultsindicatethateffectsofpulsedurationandpeakcurrent0nEDMcharacteristics,includingtheelectrodewear,materialremovalrateandsurfaceroughness,aresignificant.Thereareanoptimumpulse—offtimeandopen‘circuitvoltag
6、einthisexperiment.Grainsizeofgraphite,workpiecematerialanditwasalsofoundinthisthesisthatEDMmachinetoolsaffecttheresultsofEDMcharacteristics.ItwasprovedthatEDMmachiningtechnologymodelwithgraphiteelectrodeestablishedbyBPneuralnetworkcaneffectivelypredi
7、ctmachiningeffect,andreallyreflectmachiningtechnologyruleofmachinetools.Themeanpredictederrorswere3.62%、2%、15.7%formaterialremovalrate,surfaceroughnessandelectrodewear,respectively,Keywords:GraphiteelectrodeEDMBPneuralnetworkII第一章绪论1.1本课题的研究意义模具在汽车、机
8、电、航空航天等工业领域日益成为工业化批量生产的主要工艺设备,承担了这些工业中60%一90%的产品零部件的加工生产[1]。珠江三角洲地区聚集了16000多家模具企业,提高模具生产的整体水平,对促进广东乃至整个国家发展,都具有很大的经济效益和社会价值。虽然近年来高速铣削突破了传统铣削难以加工高硬、高强、高韧材料的限制,但电火花加工仍然是模具型腔加工的主要手段。它的加工精度和表面质量高,可加工范围宽,特别是在复杂、精密、薄壁、窄缝、高硬材料的模具型腔加工中的优势是高速铣削所不能比拟的。在电加工过程中,
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