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1、上海交通大學(xué)碩士學(xué)位論文鋼活塞鍛造過程的數(shù)值模擬分析姓名：汪磊申請學(xué)位級別：碩士專業(yè)：材料工程指導(dǎo)教師：陳軍;王以華20081101上海交通大學(xué)碩士學(xué)位論文摘要預(yù)成形的影響，優(yōu)化了模具型腔設(shè)計，解決了成形過程中產(chǎn)生的折疊和充不滿缺陷，并將成形工步減少到兩個，同時有利于提高了模具使用壽命。新產(chǎn)品開發(fā)達到一次試制成功，使試制費用降低一半。(2)選用多種規(guī)格的坯料進行模擬，研究了坯料尺寸對鍛件成形過程的影響，確定了所用原材料的直徑和長度，將原材料利用率從國外平均水平83.10%提高到85.15%，節(jié)約能源，提高了經(jīng)濟效益。關(guān)鍵詞：鍛鋼活塞
2、，預(yù)成形，數(shù)值模擬II上海交通大學(xué)碩士學(xué)位論文摘要RESEARCHONFESIMULATIONOFFORGINGPROCESSOFSTEELPISTONABSTRACTAsoneofthemainengineparts,pistonplaysanimportantroleintheperformanceparametersofthewholeengine.Enginehasbeenincontinuousdevelopment.Andthisisbasedonthedevelopmentofpropertiesandlife-cir
3、cleofitsprimarycomponents.Foryears,traditionalaluminumalloyPistonhasbeenbecomingharderandhardertomeetthecontinuouslystrengthenedrequirementsandsevereemissionregulations(EuroIII,EuroIV,EuroV).Itbecomesessentialtodesignnewtypepistonwhenaluminumalloypistoncan’tadapttheeng
4、ine’sreliabilityanymore,especiallywhenpeakpressureisupto20MPaandmore.Asakeypart,thedemandsofthesteelpistonareupperonthesurfacequalityandinteriorstructureanddimension.Ontheotherhand,theenginewithasteelpistonhasbeingwidelyusedinindustry，agriculture,trafficandnationaldefe
5、nsefields.Thedemandofthesteelpistonislarge.139piston,thesteelpistonforgingisresearchedinthisthesis.Wewillsimulatetheforgingprocessindifferenttechnicsparameterswiththefiniteelementanalysissoftware,QForm.Theeffectisresearchedtosurfacequalityanddimensionandlifeofmouldduri
6、ngthesimulation.Theforgingtechnicsparametersareoptimizedaccordingtotheresultofsimulation.Forthis,theempolderingcycleisshortened.Thepistonisproducedinbatchtobringincrementalbenefit.Thecontentandconclusionarewrittenasfollows.(1)Weresearchthathowthecavityofthepreforgingmo
7、uldeffectstheforgingprocess.Wesolvethedisfigurementsuchaslap,underfillwiththeoptimizedforgingtechnicsparameters,improvingthemouldlife.Thenumberofformingstepsislessenedtotwo.Thecostislessenedwiththeonlytrial-produce.(2)Weresearchthathowthedimensionofbilleteffectstheforg
8、ingprocess.Weascertainareasonablesizebillettoproduceeconomically.Theutilizingrateofmaterialisimprovedfrom83.10%to85.1
