連續(xù)擠壓過程的3D計(jì)算機(jī)仿真和光塑性仿真.pdf

1、連續(xù)擠壓過程的3D數(shù)值模擬和光塑性模擬論文摘要f現(xiàn)代計(jì)算機(jī)技術(shù)的進(jìn)步，使得制造業(yè)正在進(jìn)入“敏捷制造技術(shù)”和“虛擬制造技t術(shù)”的時(shí)代，模具行業(yè)也不例外；模具的虛擬制造技術(shù)由模具虛擬設(shè)計(jì)、模具虛擬制造和計(jì)算機(jī)仿真分析三部分構(gòu)成，也是實(shí)現(xiàn)模具敏捷制造概念的關(guān)鍵技術(shù)之一。虛擬制造關(guān)鍵技術(shù)構(gòu)成中的一個(gè)重要因素是制造工藝過程的計(jì)算機(jī)仿真。在金屬成形過程的仿真中，有限元仿真經(jīng)過了數(shù)十年的發(fā)展，在理論上和技巧上已經(jīng)取得了很大的進(jìn)步，進(jìn)入了實(shí)用化階段；但

2、對(duì)于一些復(fù)雜的、大變形的工藝過程，在應(yīng)用研究上還很欠缺，尤其是三維成形過程的仿真模擬，仍然有待于研究，不僅是生產(chǎn)實(shí)際中的需要，而且對(duì)“虛擬制造技術(shù)”和“敏捷制造技術(shù)”的實(shí)現(xiàn)，起著決定性的作用。因此’)本文首次對(duì)連續(xù)擠壓的變形工藝全過程進(jìn)行T維和三維模擬。／，健續(xù)擠壓作為一種生產(chǎn)超長線材、管材、型材的新型擠壓技術(shù)，已在鋁以及鋁合＼金盤管、中小型材和電線電纜包覆以及顆粒材料成形方面得到了廣泛的應(yīng)用。但是關(guān)于連續(xù)擠壓成形過程中金屬變形行為的理

3、論還處于二維初級(jí)階段；這無疑對(duì)連續(xù)擠壓過程的工藝制定、模具設(shè)計(jì)及CAD／CAM、產(chǎn)品質(zhì)量的控制都是十分不利的。為此，本文首次對(duì)連續(xù)擠壓形變過程進(jìn)行了二維和三維模擬。這對(duì)于連續(xù)擠壓成形過程中金屬變形行為的理論研究具有很大的實(shí)際意義。連續(xù)擠壓工藝，與一般的金屬成形工藝相比，有兩個(gè)突出的特點(diǎn)：一是將摩擦力由阻力變?yōu)轵?qū)動(dòng)力；另一個(gè)特點(diǎn)是在摩擦熱和變形熱的共同作用下，使坯料進(jìn)入擠壓機(jī)的擠壓型腔中自動(dòng)升溫至400～500℃。為此，在連續(xù)擠壓技術(shù)的理

4、論研究中，摩擦、驅(qū)動(dòng)模型和熱力耦合模型的研究尤為重要0本文首次對(duì)連續(xù)擠壓的摩擦模型和熱力耦合模型進(jìn)行了研究，建立了基于多因素變化的摩擦驅(qū)動(dòng)模型，推導(dǎo)出摩擦邊界條件。在連續(xù)擠壓的二維模擬中，總結(jié)歸納了模具和工藝參數(shù)對(duì)擠壓變形過程及產(chǎn)品的IⅡTheThree—dimensionalComputerandPhotoplasticSimulationofContinuousExtrusionFormingProcessABSTRACTBecau

5、seoftheadvancedcomputerandnetworktechnologythetimeiscomingof“A西lemanufacturing’and‘“Virtualmanufacturing’inthemechanicalmanufacture，especiallyinDieandMouldindustryDieandMould’SVirtualmanufacturingcomposedofthreepans：Die&

6、Mould’Svirtualdesign，virtualmanufactureandcomputersimulation，iSoneofthekeytechnologiesofDieandMouldAgilemanufacturingComputersimulationisoneimportantpartinthe“VirtualManufacturing”and“AgileManufacturing’Thesimulationof同j

7、MiSusedinmetalformingprocessforseveraldecadesandalotofresearchworkshavebeinggottenButtherearesomeabsenceinlargeandconl【plexcombiningdeformationproblemsespecialfor3一dimensionalsimulatingproblemsCONFORM(ContinuousExtrusion

8、Forming)isanewtechnologytoproducetheultralongwire，tube，andshape；anditiswidelyusedinproducingthealuminumalloycoilpipes，middlesizeandsmallsizeshapeswiresandcablescoveredbyaluminumandinWOrkingtheparticulatesandSOOnHoweverth

9、etheoreticalstudyaboutCONFORMprocessisinthe2dimensiohalpreliminaryphase，whichisveryunfavorableforformulatingthetechnologicalrulesdesigningdiesanditsCAD／CAMandcontrollingthequailtyoftheproductsIntllisdissertationtlle3一dim

10、ensionalsimulationofCONFoRMdeformationprocesseshasbeendonebyrigidviscoplastic刊iMforthefirsttimeThefricfionaImechanismandfrictionforcemodelofmetalforminghavenotyetformedaperfecttheorysystembecauseofitstechnicalparticulari

11、tynlcCONFORMprocess，onespecialtechnologyofmetalforminghasitsfrictionalspecificitythatthef西ctioniSadrivingandthefrictionheatanddeformationheatmakethedeformingbody’StemperaturegoupSoitisveryimportanttostudythefrictionmodel

12、andthermoforcecouplingofCONFORMprocessThiSpaperanalyzedthefrictionalspecificityandthefractionalfactorsinoftheCONFORMprocess，bulItthefrictionalforcemodel，deducedthecorrespondingfunctionalequationThemodelwasusedinthecomput

13、ersimulationofCONFORMprocessThemodelingresultspredictedthestressstrainandtemperaturefieldswhichiSidenticaltofricfionalspecificityofCONFOI蝴processTwo—dimensionalsireulationandthreedimensionalsimulationofCONFORMprocesswasd

14、onebyusingthecommercialF】jMprogramDEFORM2D3DInthe2dimensionalsimulationseveralgeometryandtechniqueparametersofthediewereappliedtodeterminet11einfluenceonthemetaldeformationIt’Sthefirsttimetosimulatingthe3dimensionalmodel