《模具专业英语》(第四版)课后答案 肖伟平 谢英星

Unit1MoldMaterialsLesson1PolymersⅠ.TranslatethefollowingintoChinese.1.polymericsolidmaterial 高分子固体物质 5.heat-shrinkabletubing热收缩管2.syntheticmaterials 合成物 6.syntheticfabrics 合成纤维织物3.thermosettingplastics 固性塑料 7.liquidcrystaldisplay 液晶显示器4.telecommunicationsequipment通讯设备 8.appliedelectricfield 应用电场Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Plasticsarealargeandvariedgroupofsyntheticmaterialswhichareprocessedbyformingormoldingintoshape.2.Engineerstheworldoveruseheatshrinkabletubinginsteadofstandardapproachesforinsulation，suchastapingormoldinginplace.3.Syntheticfabricsdonotoccurinnatureasthemselvesbutareusuallyderivatives/ofpetroleumproducts.4.Liquidcrystalphasesareformedfromgeometricallyanisotropicmolecules.5.Undertheinfluenceofanappliedelectricfield，alignmentofthepolymermoleculesgivesrisetolightabsorption.Ⅲ.Answerthefollowingquestions.1.Whatarethetwoindustriallyimportantpolymericmaterials?Twoindustriallyimportantpolymericmaterialsareplasticsandelastomers.2.Whatisthebasicbuildingblockofaplastic?Thebasicbuildingblockofaplasticisthepolymermolecule.3.Whydoengineersovertheworlduseheat-shrinkabletubinginsteadofstandardapproaches?Theheat-shrinkabletubingcomesinawiderangeofsizes,colors,andmaterials.Whenheated,itshrinkstoconformtothesizeandshapeoftheunderlyingmaterial,makinginstallationfastandeasy.4.Whatisasyntheticfabric?Thesyntheticfabricisman-madecopyofnaturalfabrics,whichdoesnotoccurinnaturebythemselvesbutisusuallyderivativeofpetroleumproducts.5.Whatisaliquidcrystal?Aliquidcrystalis,asthenamesuggests,astateofmatterintermediatebetweena“normal”liquidandasolid.Lesson2MoldMaterialsⅠ.TranslatethefollowingintoChinese.1.processingparameters工艺参数 5.computeraideddesign计算机辅助设计2.exoticmaterials奇异材料 6.computerintegratedmanufacturing计算机集成制造3.materialproperties材料特性 7.thermalconductivity热导性4.coolingsystem冷却系统 8.cycletime生产周期Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Itisthereforenotsurprisingthat，moldscanbemadeofaverybroadspectrumofmaterials，includingsuchexoticmaterialsaspapermatchandplaster.2.Atypicalexamplecanbeseeninthechoicebetweencastmetalmoldsandmachinedmolds，withtheirverydifferentcoolingsystems.3.Thisreferslesstothemodernmaterialsandcomponentsproducedbypowdermetallurgy，andpossiblybyhotisostaticpressing，thantosinteredmetalsinthesenseofporous，airpermeablematerials.4.Moreover，becauseventingtakesplaceovertheentiresurfaceareaofthecavity，fillingofthecavitycanoccurfaster，andthereis，inprinciple，freedominselectingthelocationofthegate.5.Inthisway，theriskofejectormarksisreducedoreliminated，andthereisnoneedtoovercomeavacuumduringejection.Ⅲ.Answerthefollowingquestions.1.Whytheselectionofthemoldmaterialsissoimportant?Theselectionofmoldmaterialisnotonlyaquestionofmaterialpropertiesandanoptimumprice-to-performanceratiobutalsothemethodsusedtoproducethemold,andthustheentiredesigncanbeinfluenced.2.WhatarethesuperiorityofCADandCIM?Incontrasttothepreviouslyusedmethodsbasedontheuseofpatterns,theuseofCADandCIMoftenrepresentsthemoreeconomicalsolutiontoday,notonlybecausethisproductioncapabilityisavailablein-housebutalsobecausewithsomeothertechniqueanorderwouldhavetobeplacedwithanoutsidesupplier.3.Whatarethecharacteristicsofceramics?Characteristicsofceramicsareconstantpropertiesuptoveryhightemperature,lowtensilestrengthandpoorthermalconductivity.4.Howtoremoveairfromthecavityofamold?Removalofairfromthecavityofamoldcanbeaccomplishedusingporousmetallicmaterials.5.Whatisthewholeprocessofmicroporousmetalejecting?Currently,anumberofmethodsexistforproducingmicroporousmetalstructures.Oneisbyconstructingahoneycomborsimilarstructurebybonding,brazing,weldingordiffusionbondingindividualcomponentsformingthestructure.Anotherwayofproducingporousmetalstructuresisbyintroducinggasintometallicmelts.Forexample,aluminumalloymeltscanbeexposedtohydrogen,whichdissolvesinthemoltenmetal.Thedissolvedgasisreleaseduponsolidificationofthemeltresultinginporosity.Theporositygeneratedbythismethodisnotcontrolledandvariesinuniformityandsize.Forthisreason,thistechniqueisnotcommerciallyuseful.Lesson3SelectionoftheSteelⅠ.TranslatethefollowingintoChinese.1.highcompressivestrength高抗压强度5.polishingproperties抛光性能2.wearresistance耐磨性 6.surfacetexturing表面处理3.corrosionresistance耐蚀性 7.surfacehardness表面硬度4.dimensionalstability尺寸稳定性8.annealedstate退火状态Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Theprocessdevelopedformoldingplasticsandthedifferentprocessingpropertiesoftheplasticsleadtodifferentloads，whichmustbetakenintoconsiderationnotonlyinthedesignbutalsointheselectionofthematerialsrequiredformolds.2.Afterthenecessaryheattreatment，casehardenedsteelsstillhaveatoughcoresaswellasawear-resistantsurface.3.Prehardenedmoldsteelswereoriginallyusedonlyforlargemoldsbuthavenowgainedacceptanceinplasticsprocessingformoldsofallsizes.4.Theadvantagesofusingfullyhardenedtoolsteelsratherthancasehardenedsteelsformoldsareprimarilythesimplerheattreatmentandthepossibilityofmakingcorrectionstothecavityatalatertimewithoutanewheattreatment.5.Whenplasticsareprocessedwithhighfillercontentwhichcauseheavywearing，itisrecommendedthatmaragingsteelsarenitrided.Ⅲ.Answerthefollowingquestions.1.Whatarethemostimportantrequirementsforthemoldsteels?(1)Highcompressivestrengthexpectedevenathightemperatures;(2)Wearresistance;(3)Greattoughness;(4)Corrosionresistanceandgoodthermalconductivity.2.Whatarethepropertiesthemoldmakerexpecting?(1)Goodmachinability;(2)Goodhobbingcapabilities(whererequired);(3)Dimensionalstabilityduringheattreatment;(4)Goodpolishingproperties;(5)Surfacetexturingwithoutdifficulties(whererequired).3.Whydotheprehardenedmoldsteelsgainacceptanceinplasticsprocessingformolds?Becauseheattreatmentisnotrequired,therearenoproblemswithunavoidabledimensionalchangesandassociatedreworking.4.WhatarethedisadvantagesofledeburitesteelD2?ThedisadvantagesofledeburitesteelD2arethatitismoredifficulttomachineevenintheannealedstateandhardtopolishbecauseofitshighcarboncontent.5.Whataretheadvantagesofhardmaterialalloys?Theadvantagesofhardmaterialalloysarehighwearingresistance,veryhighhardness,andtheyaresuppliedinthesoftannealedconditionandcanbemachined.Unit2TheInjectionMoldDesignLesson4TheInjectionMoldingandMachineⅠ.TranslatethefollowingintoChinese.1.heatedbarrel加热筒 5.berylliumcopper铍铜合金2.clampingforce锁模力 6.ElectricalDischargeMachining电火花加工3.massproduction大批量生产 7.spruebush浇口套4.Rockwell-Cscale洛氏硬度C级 8.trappedair积存的空气Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Injectionmolding(BritishEnglish:moulding)isamanufacturingprocessforproducingpartsfromboththermoplasticandthermosettingplasticmaterials.2.Pressesareratedbytonnage，whichexpressestheamountofclampingforcethatthemachinecanexert.3.Moldsaretypicallyconstructedfromhardenedsteel,pre-hardenedsteel，aluminium，and/orberyllium-cooperalloy.4.Plasticresinentersthemoldthroughasprueintheinjectionmold,thespruebushistosealtightlyagainstthenozzleoftheinjectionbarrelofthemoldingmachineandtoallowmoltenplastictoflowfromthebarrelintothemold,alsoknownascavity.5.Trappedairinthemoldcanescapethroughairventsthataregrindedintothepartinglineofthemold.Ⅲ.Answerthefollowingquestions.1.Howdoestheinjectionmoldingwork?Materialisfedintoaheatedbarrel,mixed,andforcedintoamoldcavitywhereitcoolsandhardenstotheconfigurationofthemoldcavity.2.Whatdoesinjectionmoldingmachinesconsistof?Injectionmoldingmachinesconsistofamaterialhopper,aninjectionramorscrew-typeplunger,andaheatingunit.3.Whatarethestandardtwoplatestooling?Thestandardtwoplatestooling:coreandcavityareinsertsinamoldbase-“Familymold”of5differentparts.4.Whatarethetwoprimarycomponentsofmold?Themoldconsistsoftwoprimarycomponents,theinjectionmold(Aplate)andtheejectormold(Bplate).5.Howdoesthetrappedairinthemoldtoescape?Trappedairinthemoldcanescapethroughairventsthataregrindedintothepartinglineofthemold.Lesson5Three-plateInjectionMoldⅠ.TranslatethefollowingintoChinese.1.partingline分型面 5.ejectorbar推杆2.pinpointgate针孔型浇口 6.guidepin导向销3.strokedistance行程距离 7.star-shapedrunner星形流道4.retentionsystem滞留系统 8.strippersleeve分型（模）套Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Three-plateinjectionmoldsareinjectionmoldspossessingtwopartinglines，havingbeendesignedasdegatingmolds.2.Attheconclusionofinjectionthemoldopensatthefirstpartingline，whichcontainsthesprueandrunnerandseparatedthepinpointgatefromthepart.3.Moldconstructedonthisprincipleispreferablyemployedbecauseofthesimplicityofthegatingtechnique.4.Butthereissomeconcernthatbulkyrunneroftendonotropeasilybetweenthemoldpartinglines.5.Itisimportantthatasufficientlylargegapalwaysbeset.Ⅲ.Answerthefollowingquestions.1.Howdoesthreeplateinjectionmoldwork?Three-plateinjectionmoldsareinjectionmoldspossessingtwopartinglines,havingbeendesignedasdegatingmolds.Thismeansthatthesprueisseparatedfromthepartsinthemold.2.Whatdoesthreeplateinjectionmoldcompriseof?Threeplateinjectionmoldcompriseoftwopartinglines.3.HowdoesinjectionmoldworkinFig.2-7?Theplate4tobemovedinFig.2.7isconnectedtotheejectorplatesbyejectorrods,whichinturnarefixedintheirbasicpositionbystrongspring3.Plate4iscarriedalonguntiltheejectorplatesarestoppedbyrunningagainsttheejectorbarofthemachine.Thenonlythecompletemoldbodykeepsmovingonintheusualmanner.4.WhatdoestypicaldegatingtoolconstituteofinFig.2-9?1.Ejectorrod;2.Sprueseparatingarea;3.Latch;4.Strippersleeve;5.Waterway;6.Pin;7.Guidestrip;8.Sprue;9.Retainerpin;10.Headofbolt;11.Bolt;12.Sprue-strippingplate;13.Moldcores;14.Mainpartingline;15.Plateassembly5.HowdoesthetypicaldegatingtoolworkinFig.2-9?Attheconclusionofinjectionthemoldfirstpartedat2inthesprueseparatingareawhenthemachineopens.Thecompletemoldblock,withtheexceptionofthefixedmoldhalf,isinterlockedwithinitselfbythelatch3,asthesprue8ishledcaptivebytheundercutintheretainerpin9,thepartisservedfromthesprue,whichstaysonthefixedforward,therebystrippingthespruefromtheretainingpin9.Whenthesequencehasbeencompleted,thepin6oflatch3hasarrivedattheinclinedplaneoftheguidestrip7inposition5,forciblyliftingthelatchandtherebyendingtheinterlock.Theheadofbolt11reachedtheplatesalongthefixedposition.Thecontinuingsequenceoftheopeningmovementconsistsoftilemoldopeningatthemainpartingline14,therebycreatingthedrop-outopeningfortheejectedpart.Astheopeningsequencecontinues,theheadofejectorrod1pushesagainsttheejectorofthemoldingmachineandstopstheplateassembly15aswellasthestrippersleeve4.Themoldcore13fittedintotheplateassembly15withdrawsfromthepart,andtheejectionprocessisconcluded.Lesson6FeedSystemⅠ.TranslatethefollowingintoChinese.1.feedsystem浇注系统 5.moltenplastic熔融塑料2.fourimpression四腔模 6.spruebush浇口套3.twoplatetype两板式 7.coldslugwell冷料井4.branchrunner分流道 8.ejectionphase推出过程Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Normallythefeedsystemcomprisesasprue，arunnerandagate.2.Itisseenthatthematerialpassesthroughthesprue，mainrunnerbranchrunnersandgatebeforeenteringtheimpression.3.Itisdesirabletokeepthedistancethatthematerialhastotraveldowntoaminimumtoreducepressureandheatlosses.4.Asprueisachannelthroughwhichtotransfermoltenplasticinjectedfromthenozzleoftheinjectorintothemold.5.Thegatehasthefollowingfunctions:restrictstheflowandthedirectionofmoltenplastic;simplifiescuttingofarunnerandmoldingssoastosimplifyfinishingofparts;quicklycoolsandsolidifiestoavoidbackflowaftermoltenplastichasfilledupinthecavity.Ⅲ.Answerthefollowingquestions.1.Whatdoesfeedsystemcomprise?Normallythefeedsystemcomprisesasprue,arunnerandagate.2.Whatroledoesasprueplay?Asprueisachannelthroughwhichtotransfermoltenplasticinjectedformthenozzleoftheinjectorintothemold.3.Whatroledoesarunnerplay?Arunnerisachannelthatguidsmoltenplasticintothecavityofamold.4.Whatroledoesagateplay?Agateisanentrancethroughwhichmoltenplasticentersthecavity.Thegatehasthefollowingfunctions:restrictstheflowandthedirectionofmoltenplastic;simplifiescuttingofarunnerandmoldingssoastosimplifyfinishingofparts;quicklycoolsandsolidifiestoavoidbackflowaftermoltenplastichasfilledupinthecavity.5.Whatroledoesacoldslugwellplay?Thepurposeofthecoldslugwellshownoppositethesprueistheoreticallytoreceivethematerialthathaschilledatthefrontofthenozzleduringthecoolingandejectionphase.Perhapsofgreaterimportanceisthefactthatitprovidespositivemeanswherebythespruecanbepulledfromthespruebushforejectionpurposes.Lesson7MoldCavitiesandCoresⅠ.TranslatethefollowingintoChinese.1.integermethod整体式 5.highchromesteel高铬钢2.insertmethod镶拼式 6.multi-impressionmold多腔模具3.splitinsert拼块 7.moldalignment模具啮合调整4.castingtechnique铸造技术 8.boxtypecomponent箱形组件Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Thecavityandcoregivethemoldingitsexternalandinternalshapesrespectively，theimpressionimpartingthewholeformtothemolding.2.Whenthecavityorcoreismachinedfromalargeplateorofsteel，orblockiscastinonepieceandusedwithoutbolsteringasoneofthemoldplates，itistermedanintegercavityplateorintegercoreplate.3.Themethodconsistsinmachiningtheimpressionoutofsmallblocksofsteel.4.Boththeintegerandtheinserts-bolstermethodshavetheiradvantagesdependinguponthesize，theshapeofthemolding，thecomplexityofthemold，andwhetherasingleimpressionoramulti-impressionmoldisdesired，thecostofmakingthemold，etc.5.Unquestionablyforsingleimpressionmoldstheintegerdesignistobepreferredirrespectiveofwhetherthecomponentformisasimpleoracomplexone.Ⅲ.Answerthefollowingquestions.1.Whatarethetwomajorcategoriesofcavityandcore?Thetwomajorcategoriesofcavityandcorearetheintegermethodandtheinsertmethod.2.Whatarethetwomainmanufacturingprocessesforpreparingmolds?Theseareadirectmachiningoperationonaroughsteelforgingorblankusingtheconventionalmachinetools,andtheprecisioninvestmentcastingtechniqueinwhichamasterpatternismadeofthecavityandcore.3.Whatarethedisadvantagesofmachiningthecavityandcoreplatesfromsingleblocksofsteel?Themachiningsequencesandoperationwouldbealtogethertoocomplicatedandcostly.4.Whatarethedisadvantagesofinsertbolstermethods?Thedisadvantagesofinsertbolstermethodsare:thestrengthstiffnessofbottomispoorer,andeasytocauseflash,theyshouldbejoinedtogethertofirmtightly.5.Forsingleimpressionmolds，whichmethodispreferred?Unquestionablyforsingleimpressionmoldstheintegerdesignistobepreferredirrespectiveofwhetherthecomponentformisasimpleoracomplexone.Lesson8EjectionSystemⅠ.TranslatethefollowingintoChinese.1.thermoplasticmaterial热塑性熔体 5.backplate动模座板2.automaticactuation驱动 6.supportblock支承块3.ejectorgrid推出支架 7.ejectorrod注塑机推杆4.ejectorplateassembly推板装配机构 8.pinejection推杆脱模Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Amoldingisformedinmoldbyinjectingaplasticmeltunderpressure，intoanimpressionviaafeedsystem.2.Facilitiesareprovidedontheinjectionmachineforautomaticactuationofansystem，andthisissituatedbehindthemovingplaten.3.Theejectorgridisthepartofthemoldwhichsupportsthemoldplateandprovidesaspaceintowhichtheejectorplateassemblycanbefittedandoperated.4.Inthisparticulardesigntheejectorrodfunctionsnotonlyasanactuatingmemberbutalsoasamethodofguidingtheassembly.5.Whenamoldingcools,itcontractstosomedegreedependingonthematerialbeingprocessed.Ⅲ.Answerthefollowingquestions.1.Howdoestheejectionsystemwork?Amouldisusuallydesignedsothatthemouldedpartreliablyremainsontheejector(B)sideofthemouldwhenitopens,anddrawstherunnerandthesprueoutofthe(A)sidealongwiththeparts.Thepartthenfallsfreelywhenejectedfromthe(B)side.Tunnelgates,alsoknownassubmarineormouldgates,arelocatedbelowthepartinglineormouldsurface.Anopeningismachinedintothesurfaceofthemouldonthepartingline.Themouldedpartiscut(bythemould)fromtherunnersystemonejectionfromthemould.Ejectorpins,alsoknownasknockoutpins,arecircularpinsplacedineitherhalfofthemould(usuallytheejectorhalf),whichpushthefinishedmouldedproduct,orrunnersystemoutofamould.Theejectionofthearticleusingpins,sleeves,strippers,etc.maycauseundesirableimpressionsordistortion,socaremustbetakenwhendesigningthemould.2.Wheredoesejectorsystemlocateinthemold?Themold’sejectorsystemwillbemosteffectivelyoperatedifplacedinthemovinghalfofthemold.3.Whatistheroleofejectorgrid?Theejectorgridisthepartofthemoldtowhichsupportsthemoldplateandprovidesaspaceintowhichtheejectorplateassemblycanbefittedandoperated.4.Whatcomponentsdotheejectorplateassemblyconsistof?Theassemblyconsistsofanejectorplate,aretainingplateandanejectorrod.5.Whatarethebasicejectiontechniques?Thebasicejectiontechniquesareasfollows:pinejection,sleeveejection,stripperplateejectionandairejection.Lesson9SplitsⅠ.TranslatethefollowingintoChinese.1.moldplate模板 5.fingercam斜导柱2.angledliftsplit斜滑块 6.doglegcam弯销3.slidingsplit滑块 7.camtrack凸轮装置4.moldhalf模板的另一半 8.compressionspring压缩弹簧Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Themolddesignerisfrequentlyconfrontedwithacomponentdesignthatincorporatesarecessorprojectionwhichpreventsthesimpleremovalofthemoldingfromthemold.2.Thedesignerconsidersmorecomplexsystemswherethesplitsareretainedonthemoldplateandactuatedautomatically.3.Asthemoldisopened，thecamsattachedtothefixedmoldhalfcausethesplitstothemovingmoldplate.4.Thesplitsarecausedtomoveoutwithanangularmotion，theoutwardcomponentofwhichrelievestheundercutportionofthemolding.5.Themainrequirementoftheguidingsystemisthatthesplitmustberestrainedtomovesmoothlyintherequiredplane.Ⅲ.Answerthefolowingquestions.1.Whatarethetwobasicdesignsofsplits?Therearetwobasicdesigns:slidingandangled-liftsplits.2.Whatdotheconditionsofsplitsneedtomeet?Itisnecessarytoarrangeforguidingthesplitsinthedesireddirection,actuatingthesplits,andsecurelylockingthesplitsinpositionpriortothematerialbeinginjectedintothemold.3.Whatistheprincipleofslidingsplit?Thesplitsaremountedinguidesonaflatmoldplateandtheyareactuatedinoneplanebymechanicalorhydraulicmeans.4.Whatistheprincipleofangled-liftsplits?Thesplitsaremountedinachase-bolsterwhichformsthepartofthemovinghalfofthemold.Thesplitsarecausedtomoveoutwithanangularmotion,theoutwardcomponentofwhichrelievestheundercutportionofthemolding.5.Whatarethevariousalternativesystemswithrespecttoparticularactuatingmethods?Thevariousalternativesystemswithrespecttoparticularactuatingmethodsare;angledguiddowelactuatingsystem:camtrackactuatingsystem;springactuation.Lesson10MoldCoolingⅠ.TranslatethefollowingintoChinese.1.coolingconditions冷却条件 5.partwarpage零件翘曲2.cycletime循环时间 6.coolingcircuit冷却回路3.partdimension零件尺寸 7.turbulentflow湍流4.surfacefinish表面光洁度 8.fluidviscosity液体黏度Ⅱ.Fillintheblankswiththeinformationgiveninthetext.1.Moldersmustbeversedinmaterialsscienceandtheworkingsofamoldingpress.2.Andtheyshouldevenbeatleast“shadetree”toolingexperts,familiarwithsteels，heattreating，runnersandgates，andmoldcooling.3.Turbulentflowbeginswhenthevelocityoffluidinachannelincreasestoacriticallevel.4.Thebestcoolingsystemintheworldwon'ttakeawayheatanyfasterthanthemoldedpartwillgiveitup.5.Anditistruethatthefastertheflowrate，themoretotalheatyouremove,eventhoughthechangeinthetemperatureofthewaterflowingthroughthemoldisveryslight.Ⅲ.Answerthefollowingquestions.1.Whatknowledgedothetoolingexpertsshouldtoknow?Thetoolingexpertsshouldbefamiliarwithsteels,heattreating,runnersandgates,andmoldcooling.2.Whatfactorsareinfluencedbythecoolingconditions?Criticaldimensions,surfacefinish,andpartwarpageareallaffectedbycoolingconditions.3.Whatisturbulentflow?Turbulentflowbeginswhenthevelocityoffluidinachannelincreasestoacriticallevel.4.Howdoesturbulentflowhelp?Itimprovesheattransferbymixingwarmerfluidnearthewallofthecoolingpassagewiththerelativelycoolerinteriorfluid.5.WhatisReynold'snumber?Reynold'snumberincludesthecoolingpassagegeometry,fluidviscosity,androughnessofthepipewalls.Lesson11RunnerlessMoldsNozzleTypesⅠ.TranslatethefollowingintoChinese.1.twopartmold两板模 4.thereversetaperedsprue倒锥形主流道2.therunnersystem浇注系统 5.thecentralcore中心部位3.asecondarynozzle二级喷嘴 6.alargediameterrunner大直径分流道Ⅱ.Placea“T”aftersentencesthataretrueandan“F”afterthosethatarefalse.F1.Therearetwostandarddesignsincommonuseandtheydifferonlywithrespecttotheformatofthespruebush.F2.Thetwoplatesareattachedtogetherbyquick-releaseswinglathesbeforethenormalmoldingoperation.F3.Whenthemoldisopened，thefeedsystemisextractedfromthecavity，andthesprueisbrokenatthebigdiameterend.T4.Thistechniqueisonlypracticablebecausethermoplasticshavesuchgoodinsulatingproperties.Ⅲ.Answerthefollowingquestions.1.Whatfunctionisthesmalllengthofreversetaperintheboreatthefrontendofthenozzle?Thesmalllengthofreversetaperintheboreatthefrontendofthenozzleissuchthatthesprueisbrokenjustinsidethenozzle.Thishelpstokeepthenozzlefacecleanandassistsinmaintainingaleak-freesealingface.2.Whereisthegatebrokenwhenthemoldingisextractedfromthecavity?Asthemoldopens,themoldingisextractedfromthecavityandthegateisbrokenatitsjunctionwiththereversetaperedsprue.3.Whodevelopedthesystemforpolyethylene?ThedevelopmentoftheinsulatedrunnermoldiscreditedtoPhilipsChemicalCompany(USA)whodevelopedthesystemforpolyethylene.4.Whatwillhappeniftheproductioncycleisinterruptedforsomereason?Naturally,solidificationoftherunnersystemwilloccuriftheproductioncycleisinterruptedforsomereason.Unit3PressProcessandDieDesignLesson12Blanking所有问题原文找不到答案Ⅰ.TranslatethefollowingintoChinese.1.cuttingoperations切削操作5.ataperedhole锥形孔2.theguidepins导向柱6.thefinishedworkpiece成型零件3.theuniformstraining相同的张力7.metalflow金属流动4.automotiveparts汽车零件8.airvent通气孔Ⅱ.Placea“T”aftersentencesthataretrueandan“F”afterthosethatarefalse.F1.Drawingisaprocessofchangingaflat，precutmetalblankintoahollowvesselwithexcessivewrinkling,thinning,orfracturing.T2.Diesetsinsomesizesanddesignsarecommerciallyunavailable.T3.Drawingisaprocessofchangingaflat,precutmetalblankintoahollowvesselwithsomewrinkling,thinning,orfracturing.T4.Vbendingproducesabendhavingonlysomeangles.T5.Ifthespringpressurepadisusedwithoutthestoppin，thelessthespringsaredepressed，thelessthepressureisexertedontheblank.F6.Theblankingdieaswellasthepunchpadisscrewedanddoweledtothelowershoe.Ⅲ.Answerthefollowingquestions.1.Whataremountedinthelowershoe?2.Whereisthatallstrainiszeroduringbending?3.Whichoneisthesimplesttypeofdrawdieswithonlyapunchanddie?4.Whatisthecharacteristicofcompounddies?5.Whatwillhappenbetweentheinnersurfaceandtheouterifbending?Lesson13ExtrusionⅠ.TranslatethefollowingintoChinese.1.ambienttemperature室温 4.lowcarbonsteels低碳钢2.ashapedhole一个具有一定形状的孔口5.uniformcrosssection相同的横截面3.theextrus