空心型材擠壓過程數(shù)值模擬及模具結構優(yōu)化研究.pdf

1、湖南大學碩士學位論文空心型材擠壓過程數(shù)值模擬及模具結構優(yōu)化研究姓名：何芯申請學位級別：碩士專業(yè)：材料加工工程指導教師：李落星黃長清20100408空心型材擠壓過程數(shù)值模擬及模具結構優(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