搜索
-1-NewTrendsandProblemsinMaterialProcessingMachineDesignTheoryWANGAi-lun,DUANJi-an,HUANGMing-hui,ZHONGJue(CollegeofMechanical&ElectronicEngineering,CentralSouthUniversity,Changsha410083,HunanChina)Abstract:Basedonreviewingthehistoricalbackground,prospectingforthedevelopmenttrend,analyzingthecomplicacyandmechanismandsummingupsomeachievementsandexperiencesinscientificresearch,severalnewproblemsandthepossibledirectionofdevelopmentinmaterialprocessingtechnologyandmachineareproposed,suchas,producingnewconceptmaterialspossessingsomespecificandextraovdinarypropertiesbymeansofintegratingandcoalescingconelativefrontierscienceandtechnology;andthereafterabriefdiscussionisgiven.Keywords:interface;extraordinaryphysicalfield;processionmachine;functionmaterial-2-1TheTimeBackgroundofMaterialProcessingMachineInthelongspanofhistoryofhumanprogress,manytools,machinesandmethodswerecreatedandavarietyofmaterialswithdifferentpropertieswereprocessed.Materialsanditsprocessinghavebecomeoneofpillaranddrivingforceofmankindprogress.Inpacewithmulti-polarcompetitionincurrentworldandpeople’sstrivingperseveringlyforhappierlife,materialfunctiongoesbeyondunceasinglymen’sknowledgeandimagination,forexample,crypticfunctionmaterial,semiconductormaterial,energymaterial,vibration-absorptivematerial,super-strengthaluminumalloyaccountingfor70percentofapplicationofaeronauticsandspace,metalfoilof4～5μm,deepdrawingplatewithanisotropybelow1percent,electronicaluminumfoilwithmicro-orientationupto95percent,heatresistingaluminumalloywithsuperstrongspecificstrengthusedinaeronautics,spaceanddeepsea,etc.Thusseveralimportantdevelopmenttrendswithdistincttimefeaturesinmaterialprocessingdomainareshapedupasfollows:(1)Creatingmaterialprocessingmachinewithextraordinaryphysicalfieldforprocessingmaterialwithspecialtexturestructuresandfunctions.Forexample,applicationsofthermalenergyandmechanicalenergyarebreakingthroughunceasinglytechnologylimit,andsomenon-traditionenergy,suchasmicrowave,chemicalenergy,bioenergy,etc.,areintroducedintomaterialprocessingprocedureoneafteranother,sothatsomematerialprocessingmachineswithextraordinaryenergycircumstanceareproduced.(2)Breakingthroughtraditionalphysicallimitsandintegratingmelting,solidifying,plasticdeformationandheattreatmenttoobtainspecialfunctionofmaterialandcutdownexpenses[3].Forexample,near-netshapingmaterialprocessingtechnology,suchasfastrolling,sprayingdeposition,over-plasticmolding,injectionmolding,highenergybeam,etc,isapplied.(3)Materialprocessingprocessisforgedaheadinthedirectionofhighspeed,heavy-dutyandhighaccuracyonlinecontrol,forinstance,therollingspeedgoesupto130m·s-1,thedeformationpressurerisesupto300MPa,accuracyofdimensionupto0.1μm,accuracyofshapeupto0.1I,strengthaccuracycomesupto0.1MPa.Forthesereasons,itisnecessaryformaterial-3-processingmachinedesigntheorytointegrateandcoalesceingeniouslycorrelativefrontierscienceandtechnologytocreateandproducesomenewconceptmaterialprocessingmachinewithfollowingfunctions.2DueFunctionsofNewConceptMaterialProcessingMachine(1)Tohavetheabilitytoproduceandbearextraordinaryphysicalfieldandtransmitextraordinaryenergyflowwiththeaimofprovidingextraordinaryphysicalcircumstancesnecessaryfornewconceptmaterialprocessing.Forexample,highgradienttemperaturefieldwiththespeedofcool-downofworkinterfacewhichexceeds104～106K·s-1,linewaveandpulsecomplexexertedinsolidifying-deformingarea,super-strengthcontactstressfieldofmaterialforminginterface,turbulentflowfieldofmoltenmetalwithverybigflakinessratio,lowfrequencymagneticfieldwithrandomfrequency,microwavefieldforpowdermetalheating,ultrasonicfieldforlargevolumesolidifying,etc.[4],areapplied.(2)Tohavetheabilitytoworkincriticalstatesothathighstabilityandidealperformanceofprocessingmachineisensuredunderthecircumstanceofreinforcedtechnologicalconditionandmulti-fieldcouplingoperation.Forexample,chattersuppressingcapabilityoffastultra-thinrollingundertheconditionofboundarylubricatingstate[5],thecapabilityofself-excitedvibrationsuppressingundertheconditionofspecialfrictionstate,synergismstabilityanddisturbancestabilityofflexibleconnectingparallelshaftwithmulti-drivingsystem,etc.[4],areensured.(3)Tohavetheabilitytoaccuratelycontrolthematerialprocessinginordertoobtainlowloss,highefficiencyandhighqualityofmaterialprocessing.Forexample,super-highaccuracyon-linemonitorofproductsform,on–linemonitorandon-lineadjustmentofproductstextureandproperties,precisioncoordinationcontrolofmulti-procedure,on-linemonitorofmicro-orientationofmetalplasticdeformation,etc.[4],areensured.Someproductsaccuracyindexmaybeenumeratedasfollows:dimensionalaccuracycomingto0.1μm,microstructureuniformitytocrystallattice,strengtherrorto0.1MPa,etc.[4]In-4-short,onlybynewconceptmaterialprocessingmachinewithextraordinaryfunctionbeingdesignedandmade,canspecialfunctionmaterialbeprocessed.3ScienceProblemsandStudyContentsofMetalMaterialProcessingMachineUndertheCircumstanceofExtraordinaryPhysicalFieldInviewofthesefactsandbackgroundmentionedabove,severalnewresearchtopicscanbeadvancedasfollows.3.1CouplingHeat