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1、中北大學(xué)學(xué)位論文鋁合金內(nèi)腔帶筋筒形擠壓件成形工藝分析與實(shí)驗(yàn)研究摘要目前為了減重的需要，許多裝備上的零件被設(shè)計(jì)成薄腹板并帶有縱橫內(nèi)筋結(jié)構(gòu)。筋板類構(gòu)件的加工通常采用鑄造、數(shù)控加工或焊接的方法，材料利用率低、加工成本高和產(chǎn)品力學(xué)性能差是這些加工中存在的問題。本文在綜合分析內(nèi)腔筋件成形特點(diǎn)的基礎(chǔ)上，采用楔形機(jī)構(gòu)轉(zhuǎn)化軸向力為徑向力的加載方式擠壓成形，并對(duì)其成形過程進(jìn)行了數(shù)值模擬和實(shí)驗(yàn)研究。本文應(yīng)用MSC／superform有限元仿真模擬軟件，并對(duì)該工藝進(jìn)行了三維數(shù)值模擬。得出了成形過程中金屬的流動(dòng)規(guī)律、應(yīng)力、應(yīng)變的分
2、布情況，并得到擠壓溫度為460。C的條件下成形性較好有利于該零件成形，確定出了合理的變形工藝參數(shù)。根據(jù)數(shù)值模擬分析的結(jié)果，確定了采用等溫?cái)D壓成形的工藝，對(duì)兩種不同的模具設(shè)計(jì)方案進(jìn)行了比較，選擇了最優(yōu)化設(shè)計(jì)的模具。在此基礎(chǔ)上進(jìn)行了物理實(shí)驗(yàn)，并對(duì)數(shù)值模擬結(jié)果進(jìn)行了實(shí)驗(yàn)驗(yàn)證。結(jié)果表明，數(shù)值模擬結(jié)果同實(shí)驗(yàn)結(jié)果基本相符，表明數(shù)值模擬在實(shí)驗(yàn)之中的指導(dǎo)意義和工藝設(shè)計(jì)與模具設(shè)計(jì)的合理性。關(guān)鍵詞：鋁合金，數(shù)值模擬，內(nèi)腔筋，擠壓中北大學(xué)學(xué)位論文TheTechnologyAnalysisandExperimentalResear
3、chonRoundExtrusionPartWithIntra-cavityRibFormingofAluminumAlloyAbstractAtpresentinordertoreducetheweight，verticalandhorizontalribsinstructurearedesignedinthepartsofmanyequipmentswiththinplate．Casting,numericalcontrolmachiningandweldingmethodshavebeenusedtO
4、producethosecomplexpartswithribsusually，inwhichtherearesomanyquestionsinthoseprocessing,suchas，lowerusefactorofthematerial，highercostoftheprocessingandlowermechanicspropertyoftheproduct，etc．AccordingtOthestudyofformingcharactersofribs，theextrusionformingof
5、intra-cavityribisanalyzedgenerallyinthisarticle．Aspecialstructureisdesignedinthemodelforextrusionforming，andthenumericalsimulationandexperimentalstudyhavebeencarriedoneither．Theformingprocessingbeinganalyzedby3-DsimulationwithMSC／superform，muchkeyinformati
6、onsuchasstressdistribution,strainchangingandrulesofmetalflowareobtained．ResultofsimulationsaysthatitissuitabletOextrudeattemperature460"Cwhileotherparametersaledeterminedtoo．Basingonthenumericalsimulationresults，theisothermalextrusionformingoftechnologyhas
7、beenconfirmed，andthebetteroptimaldesignofmoldisselectedaccordingtOthecomparisonoftwodifferentones．Atlastthephysicsexperimentiscompletedandtheresultsofthenumericalsimulationareconfirmed．Alltheresultsshowthatthenumericalresultsareconsistentwiththeexperimenta
8、lresultwhichmeansthenumericalsimulationisusefulinconductingtheexperimentandthedesignoftechnologyandmoldarereasonable．KeyWords：AluminumAlloy,NumericalSimulation，Intra-cavityRib，Extrusion2原創(chuàng)性聲明本人鄭重聲明：所呈交的學(xué)位論文，是
