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1、湖南大學(xué)碩士學(xué)位論文空心型材擠壓過程數(shù)值模擬及模具結(jié)構(gòu)優(yōu)化研究姓名:何芯申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):材料加工工程指導(dǎo)教師:李落星黃長(zhǎng)清20100408空心型材擠壓過程數(shù)值模擬及模具結(jié)構(gòu)優(yōu)化研究AbstractExtrusiondieplaysaVitalroleinextrusionprocessingindustryThequalityandservicelifeofextrusiondiearekeyfactorsthattodeter
2、minethefeasibleofextmsionprocessanddeVelopmentofnewproductPonholedieisonekindofextmsiondietoproducehollowprofile,anditsstmcturalpar鋤etersdirectlyaf!fectthequalityofproductsDuetothecomplexshapeofproductandhighextmsionpres
3、sure,theportholediecouldbed鋤agedeasilyTheref0re,toensureproductqualityandimproveitsservicelife,therationaldesignshouldbeconsiderforextmsiondieInthispaper,thesoRwarcHyperXtmdewouldbeadoptedtosimulationtheextmsionprocessin
4、gf0rhoHowprofileandobtainedthesimulationresultsThefirstcasestudyaddressedapracticalproblemofwallthicknessattenuationduringextrusiontoproduceacomplexthin—walledhollowAZ6lmagnesiumprofileAHyperWrorksFEMsoRwarepackagewasemp
5、loyedtoaidinidentifyingthecausesforthewaUthicknessattenuationThereareanumberofknownmeasuresthatmaybetaketolessenoreliminatenonunifo姍materialnowduringtheextrusionprocess,includingthemodificationoftheshape,sizeandlocationo
6、ffeederportsandweldingchamberandtheadjustmentoflocalbearinglengthsFiVeadjustmentstooptimizethestructureofportholediewereproposed,suchastherestrictiVeblock,theheightandshapeofweldingchambefandtheinterspacingbetweenthemand
7、relsThewallthicknessoftheextmda『tepredictedusingFEMsimulationwasveryclosetoexperimentalmeasurementsComparingthefiVeadjustmentsforextrusiondie,adjustingtheshapeofpoIrtholecouldbalancethemetalnowandpressweU,thuscanincrease
8、thewallthicknessAtthesametime,thesecondcasefor6063aluminiumalloyhollowprofilewasinVestgatedbythesoRwareHyperXtrude,tooAlsostudiedthemetalnowindifferentdirectionsandthepressuredistributionofweldingroomThereasonfordefectsw
9、asmetalflowofdifferentdirectioninthecrosssectionTheadiustmentwastherestrictiveblockThesimulationresultsshowedthattherestrictiveblockcouldminimizetheVelocitydiffbrenceinsidetheprofile,socandecreasethephenomenonofconcaveCo
10、mparingwiththeactualextrusionprofiles,thefomingoftheprofileconcaveamendedbytherestrictiveblockThesimulationresultsdemonstratedthefeasibilityofusingFEMsimulationasausefIultooltosolveindustrialproblemsencounteredintheprodu
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