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1、外文翻译外文翻译原文：InjectionMoldingManydifferentprocessesareusedtotransformplasticgranules,powders,andliquidsintoproduct.Theplasticmaterialisinmoldableform,andisadaptabletovariousformingmethods.Inmostcasesthermosettingmaterialsrequireothermethodsofforming.Thisisrecognizedbythefactthatthermoplasticsar
2、eusuallyheatedtoasoftstateandthenreshapedbeforecooling.Theromosets,ontheotherhandhavenotyetbeenpolymerizedbeforeprocessing,andthechemicalreactiontakesplaceduringtheprocess,usuallythroughheat,acatalyst,orpressure.Itisimportanttorememberthisconceptwhilestudyingtheplasticsmanufacturingprocessesa
3、ndpolymersused.Injectionmoldingisbyfarthemostwidelyusedprocessofformingthermoplasticmaterials.Itisalsooneoftheoldest.Currentlyinjectionmoldingaccountsfor30%ofallplasticsresinconsumption.Sincerawmaterialcanbeconvertedbyasingleprocedure,injectionmoldingissuitableformassproductionofplasticsartic
4、lesandautomatedone-stepproductionofcomplexgeometries.Inmostcases,finishingisnotnecessary.Typicalproductsincludetoys,automotiveparts,householdarticles,andconsumerelectronicsgoods.Sinceinjectionmoldinghasanumberofinterdependentvariables,itisaprocessofconsiderablecomplexity.Thesuccessoftheinject
5、ionmoldingoperationisdependentnotonlyinthepropersetupofthemachinehydraulics,barreltemperaturevariations,andchangesinmaterialviscosity.Increasingshot-to-shotrepeatabilityofmachinevariableshelpsproducepartswithtightertolerance,lowersthelevelofrejects,andincreasesproductquality(i.e.,appearancean
6、dserviceability).Theprincipalobjectiveofanymoldingoperationisthemanufactureofproducts:toaspecificqualitylevel,intheshortesttime,andusingrepeatableandfullyautomaticcycle.Moldersstrivetoreduceoreliminaterejectedpartsinmoldingproduction.外文翻译Forinjectionmoldingofhighprecisionopticalparts,orpartsw
7、ithahighaddedvaluesuchasappliancecases,thepayoffofreducedrejectsishigh.Atypicalinjectionmoldingcycleorsequenceconsistsoffivephases;1.Injectionormoldfilling2.Packingorcompression3.Holding4.Cooling5.PartejectionPlasticgranulesarefedintothehoppe
