Whythinwallcupmouldsoexpensive?
Precio : Gratis
Publicado por : FGNGHJ65
Publicado en : 08-10-21
Ubicación : A Coruña
Visitas : 33
Whythinwallcupmouldsoexpensive?
Whythinwallcupmouldsoexpensive?
Whythinwallcupmouldpriceissohigh?Generalspeaking,thinwallcupmouldareusingbettersteel,hotrunner,bettercooling,betterventingandbetterdemoldingeffectiveness.
Thethinwallcupmouldrunsonhighspeedmachinewhichneedswithstandhighpressureduringcupmolding,sothemouldmovingplateandfixedplatethicknessarethickerthancommonmould.Thereneedmanyinterlocksinsidethethinwallmouldtoensureaccuracyandpillarsupporttoavoiddeformandeccentric.Theplasticairlinecupmouldneedusehighhardnesssteel,high-wearandhigh-erosionwithHRC55orabove.Thismeansthinwallmouldsteelcostishigher.
Thehotrunnerdesignislargerthanthecommonplasticmoulds,andatthesametime,needlimitthemeltresidencetometopreventtheresindegradation.Whenthemouldismult-cavities,thegatingbalanceismuchhigherthanthatofcommonmolds.Whichmeansthinwallcupmouldhotrunnercostishigher.
Thin-walledproductsdonotwithstandthelargeresidualstressesduetoheattransferirregularitiesliketraditionalwallthicknessparts.Inordertoensurethedimensionalstabilityoftheproduct,andtocontroltheshrinkageandwarpagewithinanacceptablerange,itisnecessarytostrengthenthecoolingofthemoldtoensurethecoolingbalance.Whichmeansneedbettercoolingdesigntoenhancethecoolingeffect,addinghighconductivitymetalinsertswherenecessarytoaccelerateheattransfer,likeBeCuberylliumcopper.Thecoolingcostishigherthancommonmoulds.
Duetotheshortfillingtimeandhighinjectionspeed,itisveryimportanttofullyexhaustthemold,especiallytheexhaustintheflowfrontgatheringarea,topreventairtrap.Theairisusuallydischargedthroughmouldcores,rams,ribs,studs,andpartingsurfaces.
Theairlinecupwallsandribsareverythin,theyareveryeasytodamage,andtheshrinkageinthethicknessdirectionissmall,theribsandothersmallstructuresarehardtoseparate,toavoidsticking,thereneedusemoreejectorpinswhenthinwallinjectionmolding.
Inaword,thinwallmouldstructureismorecomplicatedthancommonmoulds.That’swhythethinwallcupmouldissoexpensive.
Cutlerymouldexhaustproblem
Intheprocessofproducingcutlerymould,sometimeswillhaveunfilledparts,airbubblesetc,thisiscausedbyairexhaust.
1.Thesourceofairintheinjectioncutlerymold.
(1)Theaircontainedinthegatingsystemandthemouldcavity.(2)Somerawmaterialscontainmoisturethatisnotremovedbydrying,andtheyarevaporizedintowatervaporatahightemperature.(3)Airgeneratedbydecompositionofsomeunstableplasticsduetoexcessivetemperatureduringinjectionmolding.(4)Airformedbyvolatilizationorchemicalreactionofcertainadditivesinplasticrawmaterials.
Poorexhaustoftheknifeandforkmoldwillbringaseriesofhazardstothequalityoftheplasticparts.Themainperformanceisasfollows:
(1)Intheinjectionmoldingprocess,themeltwillreplacetheairinthecavity.Iftheairisnotdischargedintime,themeltfillingwillbedifficult,resultingininsufficientinjectionvolumetofillthecavity.
(2)Excludingtheunsatisfactoryairwillformahighpressureinthecavityandpenetrateintotheplasticinsideunderacertaindegreeofcompression,resultinginqualitydefectssuchaspores,voids,tissuesparseness,andsilverstreaks.
(3)Duetothehighcompressionoftheair,thetemperatureinthecavityrisessharply,whichcausesdecompositionandburningofthesurroundingmelt,causinglocalcarbonizationandcharringoftheplasticpart.Itmainlyoccursatthejunctionofthetwomeltsatthegateflange.
(4)Theairisnotwellremoved,sothatthemeltvelocityenteringeachcavityisdifferent,soflowmarksandfusionmarksareeasilyformed,andthemechanicalpropertiesoftheplasticpartsarelowered.
(5)Duetotheobstructionofairinthecavity,thefillingspeedwillbereduced,themoldingcyclewillbeaffected,andthetaxationefficiencywillbereduced.
Distributionofbubblesinplasticparts
(1)Thebubblesgeneratedbytheaccumulationofairinthemouldcavityofthecutleryspoonareoftendistributedontheoppositepartofthegate.
(2)Bubblesgeneratedbydecompositionorchemicalreactionintheplasticrawmaterialaredistributedalongthethicknessoftheplasticpart.
(3)Thebubblesgeneratedbythevaporizationofresidualwaterintheplasticrawmaterialareirregularlydistributedontheentireplasticpart.
Injectionmoldingisaprocessinwhichamoltenplasticisinjectedintoaclosedmoldhavingarelativelylowtemperaturethroughanozzleunderhighpressure.Boththermoplasticsandthermosetscanbeinjectionmolded.Itcanbeusedtomakevariousbox-typepackagingbucketsandpails,suchasvariouspailsboxesandsmallboxesmould.Forbox-typepackagingcontainers,Chinabucketmoldmanufacturerswillconsiderthefollowingaspectsinbucketmouldstructuraldesign.
1.Thewallthicknessofthebucketmould
Thedesignofthewallthicknessmainlyconsidersthreeaspects:oneisthickness;theotherisuniformity;thethirdisgentletransition.
1Thickness:Thewallthicknessofthebucketismainlydeterminedbyitsuse,plastictype,structureandsoon.Forthermoplastics,generallynotlessthan0.6mm,oftenchoose2~4mm;forthermosettingplastics,becauseofitspoorfluidity,thethicknessislarger,thesmallpiecesare1.6~2.5ram,thelargepiecesare3.2~8mm,themaximumisnomorethan10mm.
2Uniformity:Theuniformityofwallthicknesshasagreatinfluenceonthequalityofthebucket.Ifthethicknessdifferenceofabucketistoolarge,theshrinkagewillbeuneven,causingdefectssuchasdeformationandcrack.Therefore,thestructureshouldbedesignedwithanequalthicknessstructure.
3Smoothtransition:Insomebuckets,somepartsmusthavedifferentthicknessesduetostructuralrequirements,suchasthebucketturningpoint.Atthistime,agentletransitionshouldbeadoptedtoavoidthesuddenchangeofthesection.
2.Improvestiffnessofthebucket
Theplasticisrelativelyflexible,thebucketismadeofpoorrigidity,andtheturnoverboxtypecontainersometimeshasalargeloadcapacity,sovariousmeasuresforimprovingtherigidityshouldbeadoptedinthestructure.
1Addreinforcement:Reinforcementcanenhancethestrengthandrigidityofthecontainer.Thebasicrequirementsfortheribsare:thenumbershouldbemore,thewallthicknessshouldbethin,theheightshouldbeshort,andtheslopeshouldbesufficient.Thebottomoftheribshouldbeacirculararctransition.Thedirectionoftheribshouldbeconsistentwiththeflowdirectiontoimprovetheplastic.toughness;
2Improvetheshape:thebox-shapedbucketismostlyrectangularthin-walledparts,whichareeasytobedeformed.Variousreinforcementmeasuresshouldbetakentoslightlyextendthefoursidewallsofthebuckettoimprovetherigidity;itisastripshapeonthesidewalltopreventdistortion.Enhancement;edgereinforcementattheedgeofthebuckettopreventdeformationofthemouth;bottomreinforcementatthebottomofthebucketdesignedinacorrugated,archedshape.
3Reasonablesupport:Thebottomareaofthebox-shapedbucketislarge,butitisunreasonabletousethewholebottomsurfaceasthesupport.Becausethebottomisslightlycurved,itisnotflat.Therefore,thesurfacesupportshouldbechangedintoalinesupportorapointsupport,andtheconvexsidesupport(ie,theline)Support);raisedfootsupport(iepointsupport);theheightoftheprotrusionisgenerally0.3~0.5mm.
4Corner:Thecorneristheintersectionoftwofacesorthreefaces.Regardlessoftheshapeofthebucket,theintersectionofthefacesmustberounded,whichcangreatlyimprovetherigidityofthebucketandimprovetheplasticfillingmodel.Sex,andcandispersestressandreducedeformation.
3.Demouldingslope
Inordertofacilitatethedemoldingofthemoldedpart,asuitabledraftanglemustbeconsideredwhendesigningthebucket.Thedraftistoosmall,thedemouldingisdifficult,andthesurfaceofthebucketisdamaged;ifitistoolarge,thedimensionalaccuracyisaffected.
Thedraftanglevariesdependingontheshapeoftheplasticpart,thetypeofplastic,themoldstructure,thesurfaceroughness,themoldingmethod,andthelike.Generallyspeaking,thecommonlyusedslopeoftheplasticpartalongthedemoldingdirectionis1o~1.5o,andtheminimumisnotlessthan0.5o.
Householdmoldsareaformoffungus.Therearemanydifferenttypes,andtheycanoccurbothindoorsandoutdoors.
Moldsproducespores,whichspreadbyfloatingaroundintheair.Moldsporesarepresentinallindoorenvironments.Thereisnowaytopreventspores,andtheycanpersistinconditionswheremolditselfcannotgrow.
Moldsporesthriveinenvironmentsthataremoistandwarm,sowhentheylandonadampspot,theybegintogrow.
Moldscangrowonavarietyofdifferentsurfaces,includingfabric,paper,wood,glass,andplastic.Astheygrow,theymaydigestthematerialtheyaregrowingon.