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南通大学毕业设计(论文)38ThepressurecastingTheessencethatthepressureiscast(abbreviatedasdiecasting)isunderhigh-pressurefunction,makeliquidstateorhalfliquidmetalfillandpigeonholecastingmouldtypeinordertohigherspeed,andandsolidifybutthemethodofobtainingthecastinginthepressureshaping.First.DiecastingcharacteristicHighpressureandfillingwithandpressingthecastingmouldtwomajorcharacteristicsthatarediecastingatahighspeed.ItcommonlyusedtoisitisittooddtenthousandkPa,evenisupto2*105kPafromseveralthousandpressingtopenetratetopress.Filledwiththespeedandmadeanappointmentin100m/s,canevenreachabove100m/satsometime.Filledwithtimeveryshort,generallywithintherangeof0.01.2s.Comparedwithothercastingmethods,therearethreefollowingrespectsadvantagesindiecasting:1.TheproductsareofhighqualityThesizeofthecastingishighinprecision,generallyequivalentto6grades,evencanbeupto4grades;Surfacesmoothfinishisgood,generallyequivalentto5grades;Theintensityandhardnessarerelativelyhigh,theintensityisgenerallycastandimprovedby250%morethanthesandmould,butthecoefficientofelongationisreducedbyabout70%;Thesizeissteady,theinterchangeabilityisgood;Thincomplicatedcastingofwallofdiecasting.Forexample,theminimumwallofdiecastingofzincalloyisthick南通大学毕业设计(论文)39canreach0.3mmatpresent;Thealuminiumalloycastingcanreach0.5mm;Itis0.7mmtocastouttheapertureminimumly;Minimumpitchis0.75mm.2.ProductionefficiencyishighMachineproductivityhigh,suchasdomesticJ3typehorizontalcoldemptydiecastingmachine8hoursonaveragebut600-70timesofdiecasting,small-scalehotlaboratorycavediecastingmachineequallyeveryeighthoursbutdiecasting3000000;Itislonge-livedtopressthecastingmould,onepairpressescastingmould,theclockalloyofdiecasting,thelife-spancanbeuptohundredsofthousandstimes,verytouptoamilliontimes;Easytorealizemechanizingandautomizing.3.TheeconomicresultisfineBecausethediecastingisaccurateinsize,theformissuffusedwiththeadvantagesuchasbeingbrightandclean.Generallynolongercarryonmachiningandusedirectly,ortheprocessingamountisverysmall,sohasnotonlyimprovethemetalutilizationratiobutalsoreducedalargenumberofprocessingequipmentandman-hour;Thepriceofthecastingiseasy;Canadoptandmakediecastingupwithothermetalornonmetallicmaterials.Assembleman-hoursavemetalalsosparingly.Therearealotofadvantagesinthoughdiecasting,buttherearesomeshortcomings,tobesolved.Forinstance:1)Becauseoneofspeedsishighintheliquidmetalfillingwithtypeatthetimeofdiecasting,theflowstateisunstable,so南通大学毕业设计(论文)40adoptandgenerallypressthecastingmethod,thecastingisapttoproducetheairvent,notCanheat-treat;2)Totheconcaveandcomplicatedcasting,diecastingiscomparativelydifficult;3)Highpointalloy(suchasthecopper,ferrousmetal),itisrelativelylowtopressthelife-spanofcastingmould;4)Shouldnotproduceinbatchessmall,itiswithhighcoststhatitsmainreasonpigeonholesthecastingmouldandismade,theproductionefficiencyofdiecastingmachineishigh,produceinbatchesuneconomicallysmall.Second.TherangeofapplicationofdiecastinganddevelopmenttrendDiecastingisoneofthemostadvancedmetalshapingmethods,realizinglackingthesmearmetal,withouteffectivewayofsmearmetal,itisverywidetouse,developquickly.Presszinc,aluminium,Vandcopperthatthecastalloydoesnotconfinetothenonferrousmetalsagainatpresent,andexpandandusedforpressingthecastingironandcastingsteelonegradually.Sizeandweightofthediecasting,dependonthepowerofthediecastingmachine.Becausethepowerofdiecastingmachineisincreasingconstantly,theshapemeasurementofthecastingcanbefromseveralmm.to1-2m;Weightcanbefromseveralgramstoseveraldozenkilograms.Butthediameterofdiecastingis2mabroad,weightisaaluminiumcastingof50kg.Diecastingconfine南通大学毕业设计(论文)41autoindustryandinstrumentindustrytonolongertoo,expandothereachindustrialdepartmenttoprogressively,forinstancedozensoftrades,suchasagriculturalmachinery,machinetoolindustry,electronicsindustry,nationaldefenseindustry,computer,medicalequipment,clockandwatch,cameraandhaberdasheryandhardwa
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