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1、moldmanufacturingandthedevelopmenttrendofthemoldmoldmanufacturing:Therequirementofthemolddesign:thesizeshouldbeexact.surfaceshouldbeclean.structureshouldbereasonable.highproductionefficiency.easyautomationJongservicelifeJowcost£tc.Rigidity,oriented,dischargeinstitutions.positioningmethod,gap
2、sizeetc.shouldbeconsideredduringthemolddesignandthecoefficientselection.Thereplacementofwearingpartsonthemoldshouldbeeasy.Highefficiency.highprecision,high-lifemoldshouldbeusedinmassproduction.Theselectionofmoldmaterial:Moldmaterialselectionisaveryimportantpartoftheprocessofmakingthemold.Mol
3、dmaterialselectionneedtomeetthreeprinciples:Moldshouldmeetthewearresistance;toughnessandotherworkdemands[technicalrequirements.andalso.moldshouldmeettheeconomicapplicability.Moldtomeettheworkingconditions:Wearresistance:Blankinthemoldcavityintheplasticdenaturation,willbeflowingandslidingalon
4、gthecavity.Sotherewillbeasharpfrictionbetweenthecavitysurfaceandtheblankanditresultsinthemoldtowearandfailure.That'swhythewearresistanceofthematerialsisoneofthemostimportantandbasicperformanceofthemold.Hardnessisthemainfactorsofaffectingthewearresistance.Ingeneral,thehigherthehardnessofthemo
5、ldparts,thesmallertheamountofwear,thebetterwearresistance.Inaddition,thewearresistancerelateswiththetype,quantity,shape,sizeanddistributionofthecarbideofthematerial.Strengthandtoughness:Mostmoldworkinaverybadworkingconditions,someoftenbearabigimpactload,whichleadstobrittlefracture.Inordertop
6、reventthissituation,moldshouldhavehighstrengthandtoughness・Thetoughnessofthemoldmaterialdependsonthecarboncontent,grainsizeandorganizationofthestate.Fatiguefractureperformance:whilethemoldisworking,thelong-termeffectofcyclicstressoftenleadstofhtiguefracture.Fatiguefracturepropertiesofthemold
7、dependsonitsstrength,toughness,hardnessandthedebriscontentofthematerial.Hightemperatureperformance:whenthemoldworksinahightemperature,hardnessandstrengthwilldecrease.Itleadstoearlywearandfailurebecauseofplasticdeformation.Sothemoldmaterialshouldhav
