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郑州航空工业管理学院英文翻译2012届机械设计制造及其在自动化专业1006962班级姓名郝振兴学号100696208指导教师贺红霞职称教^~~一二0一二年三月十二日---NewTrendsandProblemsinMaterialProcessingMachine
DesignTheoryAbstract:Basedonreviewingthehistoricalbackground,prospectingforthedevelopmenttrend,analyzingthecomplicacyandmechanismandsummingupsomeachievementsandexperiencesinscientificresearch,severalnewproblemsandthepossibledirectionofdevelopmentinmaterialprocessingtechnologyandmachineareproposed,suchas,producingnewconceptmaterialspossessingsomespecificandextraovdinarypropertiesbymeansofintegratingandcoalescingconelativefrontierscienceandtechnology;andthereafterabriefdiscussionisgiven.Keywords:interface;extraordinaryphysicalfield;processionmachine;functionmaterialTheTimeBackgroundofMaterialProcessingMachineInthelongspanofhistoryofhumanprogress,manytools,machinesandmethodswerecreatedandavarietyofmaterialswithdifferentpropertieswereprocessed.Materialsanditsprocessinghavebecomeoneofpillaranddrivingforceofmankindprogress.Inpacewithmulti-polarcompetitionincurrentworldandpeople’sstrivingperseveringlyforhappierlife,materialfunctiongoesbeyondunceasinglymen’sknowledgeandimagination,forexample,crypticfunctionmaterial,semiconductormaterial,energymaterial,vibration-absorptivematerial,super-strengthaluminumalloyaccountingfor70percentofapplicationofaeronauticsandspace,metalfoilof4〜5Am,deepdrawingplatewithanisotropybelow1percent,electronicaluminumfoilwithmicro-orientationupto95percent,heatresistingaluminumalloywithsuperstrongspecificstrengthusedinaeronautics,spaceanddeepsea,etc.Thusseveralimportantdevelopmenttrendswithdistincttimefeaturesinmaterialprocessingdomainareshapedupasfollows:Creatingmaterialprocessingmachinewithextraordinaryphysicalfieldforprocessingmaterialwithspecialtexturestructuresandfunctions.Forexample,applicationsofthermalenergyandmechanicalenergyarebreakingthroughunceasinglytechnologylimit,andsomenon-traditionenergy,suchasmicrowave,chemicalenergy,bioenergy,etc.,areintroducedintomaterialprocessingprocedureoneafteranother,sothatsomematerialprocessingmachineswithextraordinaryenergycircumstanceareproduced.Breakingthroughtraditionalphysicallimitsandintegratingmelting,solidifying,plasticdeformationandheattreatmenttoobtainspecialfunctionofmaterialandcutdownexpenses[3].Forexample,near-netshapingmaterialprocessingtechnology,suchasfastrolling,sprayingdeposition,over-plasticmolding,injectionmolding,highenergybeam,etc,isapplied.Materialprocessingprocessisforgedaheadinthedirectionofhighspeed,heavy-dutyandhighaccuracyonlinecontrol,forinstance,therollingspeedgoesupto130m・s-1,thedeformationpressurerisesupto300MPa,accuracyofdimensionupto0.1Am,accuracyofshapeupto0.1I,strengthaccuracycomesupto0.1MPa.Forthesereasons,itisnecessaryformaterialprocessingmachinedesigntheorytointegrateandcoalesceingeniouslycorrelativefrontierscienceandtechnologytocreateandproducesomenewconceptmaterialprocessingmachinewithfollowingfunctions.DueFunctionsofNewConceptMaterialProcessingMachineTohavetheabilitytoproduceandbearextraordinaryphysicalfieldandtransmitextraordinaryenergyflowwiththeaimofprovidingextraordinaryphysicalcircumstancesnecessaryfornewconceptmaterialprocessing.Forexample,highgradienttemperaturefieldwiththespeedofcool-downofworkinterfacewhichexceeds104〜106K•s-1,linewaveandpulsecomplexexertedinsolidifying-deformingarea,super-strengthcontactstressfieldofmaterialforminginterface,turbulentflowfieldofmoltenmetalwithverybigflakinessratio,lowfrequencymagneticfieldwithrandomfrequency,microwavefieldforpowdermetalheating,ultrasonicfieldforlargevolumesolidifying,etc.[4],areapplied.Tohavetheabilitytoworkincriticalstatesothathighstabilityandidealperformanceofprocessingmachineisensuredunderthecircumstanceofreinforcedtechnologicalconditionandmulti-fieldcouplingoperation.Forexample,chattersuppressingcapabilityoffastultra-thinrollingundertheconditionofboundarylubricatingstate[5],thecapabilityofself-excitedvibrationsuppressingundertheconditionofspecialfrictionstate,synergismstabilityanddisturbancestabilityofflexibleconnectingparallelshaftwithmulti-drivingsystem,etc.[4],areensured.Tohavetheabilitytoaccuratelycontrolthematerialprocessinginordertoobtainlowloss,highefficiencyandhighqualityofmaterialprocessing.Forexample,super-highaccuracyon-linemonitorofproductsform,on-linemonitorandon-lineadjustmentofproductstextureandproperties,precisioncoordinationcontrolofmulti-procedure,on-linemonitorofmicro-orientationofmetalplasticdeformation,etc.[4],areensured.Someproductsaccuracyindexmaybeenumeratedasfollows:dimensionalaccuracycomingto0.1um,microstructureuniformitytocrystallattice,strengtherrorto0.1MPa,etc.[4]Inshort,onlybynewconceptmaterialprocessingmachinewithextraordinaryfunctionbeingdesignedandmade,canspecialfunctionmaterialbeprocessed.ScienceProblemsandStudyContentsofMetalMaterialProcessingMachineUndertheCircumstanceofExtraordinaryPhysicalFieldInviewofthesefactsandbackgroundmentionedabove,severalnewresearchtopicscanbeadvancedasfollows.3.1CouplingHeatTransferMechanismofMulti-PhaseInterfaceTemperature-StressFieldAbrand-newmicrostructurecanbeobtainedthroughcontinuouslylargedeformationandfastsolidifyingwhenmeltingmetalisincriticalstateofliquidsolid.Atthisverymoment,highdensityheatflowanddynamicheatresistancearepresentinmaterialprocessingcircumstance.Abasictheoryproblemofdesigningthiskindofmachineistostudymechanismofheattransmittanceandenergyconversion,andtoestablishmathematicalmodel.3.2FrictionConstraintMechanismofPlasticFlowInterfaceofMaterialProcessingMachineThecouplingbetweenoperationmechanismandworkpieceisverycomplicatedbecauseplasticflowispresentinprocessinginterface.Theinterfacestate,determinedbyvelocity,loadthermodynamicprocess,elasticityofoperationmechanism,plasticityofworkpiece,dynamicbehaviourofinterfacesticking-slidingandpartialhydrodynamiclubrication,etc,affectandformfrictionconstraintsmechanismpeculiartomaterialprocessingmachine,becausetheseconstraintspresentstrongnon-linearity;andundercertaincircumstances,theconstraintsmaybedestroyedormismatchedinstantaneouslyandthusdynamicinstabilityisresultedin.Thusfollowingproblemscanbeputforward:Mechanismof“spectrechatter”arosefromsticking-slidingfrictionandpartialhydrodynamiclubricationinrollinginterface,instabilityconditionandmechanismofconstraintbetweensmoothsurfaceandrotatingbodyunderthecircumstanceofhighspeed,heavy-dutyandboundarylubrication,Lubricationfilmabsorptionmechanismandphysicalchemistrybehaviourofinterfaceofunceasinglyregenerativesurface,therelationshipbetweenrheologicalcharacteristicandmachineoperationparameters.3.3Multi-BodyNon-LinearContactMechanismUndertheConditionofExtra-HighPressureFieldTobuildthesuperstrengthpressurefieldonlargeareaisoneofbasicfunctionofmaterialprocessingmachine,anditisalsonecessarytoformbyoncelarge-sizestructureelement(suchasspacecraft,intercontinentalvehicles,carandlarge-scaleaeroplaneetc).Theabilitytobuildsuperstrongpressurefieldisoneofimportantfeatureandthebaseofindependentnationaldefense.Underthecircumstanceofsuperstrengthpressurefield,multi-bodystrongnonhertzcontactandnon-linearfrictionwillbeproduced,thuslocalpermanentdeformationanddegradingofelementaccuracymaybeled.Newtheoryfoundationofdesignofmachinewithsuperstrengthpressurefieldwillbefurnishedthroughstudyofmulti-bodystrongnon-hertzcontactmechanism,multi-bodynon-linearfrictionmechanism(suchasprovidingforce-displacementmixedsolvingprocessofthree-dimensionmulti-body).3.4LoadDistributionLawinMulti-SlidingPairWithStructureBiasLoadWithregardtostaticallyindeterminatestructure,loaddistributionofconstraintpointisdeterminedbydeformationcompatibilitycondition.However,concerningsomeplanelarge-sizestaticallyindeterminatestructurewithslidingdegreeoffreedominthirddimension,loaddistributioncannotbedeterminedbydeformationcompatibilitycondition.Thusnewtheorybasiswillbeprovidedbyanalyzingofcontactbehaviourandmechanismofslidingpair(suchascreep,forceoffriction,integraldeformationcompatibilitycondition,etc).3.5CouplingMechanismandStabilityofMulti-PhysicalFieldsinMaterialProcessingSystemsInthewakeofsystemfunctionbecomingmoreandmorediversified,conventionaltechnologylimitsinmaterialprocessingmachineisbeingbrokethroughunceasingly,systemstructurealsobecomesincreasinglycomplicated,andsystemperformancebecomesincreasinglymulti-causal.Forexample,anyinstantaneousstateofrollerinfastrollingmillsisaffectedbyelasticdeformation,plasticflow,heattransferprocess,hydro-dynamiclubricationprocess,interfacephysicalchemistrymolecularstateandsoon.Inaddition,electromechanicalcouplinginprocessingsystemhavealreadygonebeyondconventionalconcept,forinstance,somesingularpointphenomenon(suchasmicro-variablecanbetransformedintomacro-variable),arepresent,thusrolleroperationinstabilitymaybeledbyperturbation[8].Therefore,thissubjectwillstudytheinteractionmechanismofmulti-physicalfieldandtheinfluenceonprocessingsystemstabilityandprocessingmaterialqualitystartedwithanalysisofmicro-stateofexecutivebody.3.6Multi-TechnologyIntegrationandCoalescenceofAccurateControlThematerialprocessingmachine,whichoperateunderthecircumstanceofextraordinaryphysicalfield,isacomplicatedlarge-scalesystem,andsomeparametersofthesystemvaryonfeasiblefieldboundary;thereby,tokeepunderaccuratecontrolandadjustmentofmultifieldcircumstance,multi-dimensioncoordination,multi-energyconversion,multi-levelinformationtransfer,interfacemulti-processcoupling,etc.isofmuchsignificance.Sinceavarietyofmulti-interactionexistsincontrolmodel,itisnecessarytoestablishintegrationframeworkofcoordinationworkaccordingtodecouplingofcontrolmodel,soastoaccuratecontrolbasedonthemulti-technologyintegrationandcoalescenceisrealized.3.7Quasi-RealityDesignandConcurrentDesignBasedonKnowledgeInnovationSystemsDigitalizationandvisualizationofmaterialprocessingtechnologywillpromoteimmediatelythequalityofdesign,operationandcontrol.Thereforeoptimizationofmaterialprocessingtechnologyandmaterialprocessingmachinebymeansofrealizationofvirtualsimulationofprocessingprocedurethroughquasi-realitydesignandconcurrentdesignisoneofourpressingstudysubjects.3.8MechanicalBehaviorofSpecialFunctionMaterialsintheExtraordinaryPhysicalFieldManykeyelementsandpartsinmaterialprocessingmachineareoftenunderthecircumstanceofsuperstrongforcefield,temperaturefield,electronicmagneticfieldandflowfield,andmusthavethefunctionsofconstructingspecialphysicalinterface.However,itisdifficultforcommonsingle-substancematerialsuchasmetal,ceramicpolymer,etc.tohavebothhighindexofsinglepropertyandexcellentoverallquality.Thereforeweneedtousecertainmaterialwithnewfunctionsforkeyposition[9],forinstance,multi-dimensionfunctiongradientmaterialwithultrahighphysicalproperty,multi-dimensionfunctiongradientmaterialwithintelligence.Forthesereasons,itisnecessarytostudybasiclawandmechanismofthesekindoffunctionmaterialmentionedabove,forinstance,stress(strain)distributionfunction,failuremechanismanddesigncriteriaofmaterialunderthecircumstanceofextraordinaryphysicalfield,static(dynamic)stiffnessanddamping,digitalizationdesignandvisualizationdesignofprocessingsystemmadeofgradientfunctionmaterial,etc,sothatthegeneralmechanicslawofelementwhichisunderthecircumstanceofextraordinaryphysicalfieldandmadeofanisotropymulti-dimensiongradientfunctionmaterialisobtained.Nowadays,materialprocessingscienceandtechnologyisforgingrapidlyahead.Aforward-lookingstudyaimingatkeytechnologyproblemofmaterialprocessingmachinewillprovidetheoryandtechnologyreserveformanufacturingscienceandindustryof21stcentury.4DesignexperienceGraduationdesigniswelearnedintheuniversityoftechnologyandthebasiccourses,allcourseallprofessionalclassafterthe.Thisiswehaveallofthecourseofthefirstin-depthcomprehensivereviewofthetotal,isalsoourintosocialworkinfrontofatheorywiththepracticeoftraining.Therefore,itisinourfouryearuniversitylifeholdsanimportantposition.Personally,IhopeIcanpassthegraduationdesignforyourfuturewillbeengagedintheworkofalighttraining,toexercisehisanalysisproblem,problem-solvingability,forthefutureofourmotherlandinthefourconstructionlayagoodfoundation.Turnaneyeforfourweeksofmechanicalmanufacturingtechnologyandspecialjigdesignwillbeover,thedesignofcurriculumreviewaroundthefeelingoflifeasaprocessofascension,andinthecurriculumdesign,weconstantlyseetheteachingmaterial,lookatreferenceseematerial,meettheproblemandnotunderstandweanalyzedtogetherorasktheteacherforadviceandsoontofindausefultoourdesignofdataandmaterial,andthenwilltheybecomeourdesignsuchasrawmaterial,throughthisdesignwe'velearnedalotofknowledge,andlearntoandfamiliarwiththelook-uptableandcheckreferencebook,alsomasteredproeandCADrelatedoperations,forpartsoftheprocessdesignhadadeepunderstandingandtheunderstandingoffixturedesignalsohasanunderstandingofandknowsomebasicfixturethespecificstructureparts,suchasflap,drillset,mandrelsThroughthecooperationandteammembersmakeprocessandfixturethatIunderstandcooperationisveryimportant,divisionoflaborcooperationcanworkbetterandfaster.Inthiscoursedesign,theteachergaveusvaluablereferenceopinions,letusknowhowtocompleteacoursedesign,howtoputyourthingsdone,thankstotheteachercarefullycounselling.Andwehavemoreanalysisandproblemsolvingability.Intheprocess,wefoundthatthemostlackisthesocialpracticeexperience,emptyhavebookstheoryknowledge,noperceptualcognition,oftenwilllikelyandactualapart.Ingeneral,dothiskindofdesigncanmakethewewillhavelearnedknowledgesystemrelatedtolink,whichexposedthedeficiencies.Alsohopeweinthelaterstudycanintosociety,makemoresocialpractice,inordertoimprovetheirabilitytoadapttosociety.ReferenceXuZhiGang.Basedonthecombinationofthegeneralizedmappingprinciplefixturestructuredesignautomation[J].Journalofmechanicalengineering,2000(12):105~108.ZhuYaoXiang,meltsalsosound.Flexibleclampandcomputeraidedfixturedesigntechnologydevelopment[A].Nationalproductionengineering8thacademicconferenceproceedings[C].Beijing:mechanicalindustrypress,1999.204~209.ZhouZhenBao.Theaccuracyofthemachinetoolfixturesanalysis[J].Machinetoolandhydraulicpressure,2004(2):137~138.LiuLiJuan.Machinetoolsinthedesignoffixturesidetwopositioningpin[J].Jlubricationandsealing,2003(3):107~108.Yanzhizhong,LiuXianMei.Computeraidedfixturedesignmethodanddevelopmenttrend[J].JournalofInnerMongoliaforestryuniversity,1996,(3):69~74.WangFengQi,XuGongJing,GuoWei.Computeraidedfixturedesignreview[J].Aviationmanufacturingtechnology,2003(11):38to40.ZhuYaoXiang,meltsalsoblare.Fixturedesignautomationpresentsituationanddevelopmenttrendof[J].Mechanicalscienceandtechnology,1993(10):14to17.ZhangFuRun,XuHongthis,LiuYanLin.Mechanicalmanufacturingtechnologyfoundation[M].Wu:huazhonguniversityofscienceandtechnologypress,2000.288~320.ZhaoGuJi.Mechanicalmanufacturingtechnologycoursedesigninstruction[M].Beijing:mechanicalindustrypress,1997.60~61.GuChongbitetc.Mechanicalmanufacturingtechnology[M].Xian:thescienceandtechnologypress,1990.4~58.WangQiPing.Machinetoolclampdesign[M].Harbin:Harbinindustrialuniversitypress,1996.1~134207~249.WangXiaoHua.Machinetoolfixturespictures[M].Beijing:mechanicalindustrypress,1992.36~,40~and37.DingDianZhong,JiangHongWei.Metaltechnologycoursedesign[M].Beijing:mechanicalindustrypress,1997.6~14.nationalstandardfull-textdatabasesystem[EB/OL].:6006/,1989-7-1.northeastinstituteofheavymachinery,luoyangengineering,thefirstcarfactoryworkeruniversity.Machinetoolclampdesignmanual[M].Shanghai:Shangh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