塑料模具的编制和使用.pdf_第1页
塑料模具的编制和使用.pdf_第2页
塑料模具的编制和使用.pdf_第3页
塑料模具的编制和使用.pdf_第4页
全文预览已结束

塑料模具的编制和使用.pdf.pdf 免费下载

版权说明：本文档由用户提供并上传，收益归属内容提供方，若内容存在侵权，请进行举报或认领

文档简介

THEPREPARATIONANDUSEOFPLASTICMOLDSMBBORISOVUDC66656663032PLASTERMOLDSAREWIDELYUSEDFORCASTINGWARESINTHECERAMICSINDUSTRYAPARTFROMCERTAINADVANTAGES,THEYHAVEALOWMECHANICALSTRENGTHANDSHORTWORKINGLIFEDUETOWEAROFTHEWORKSURFACEUNDERTHEACTIONOFWATERANDELECTROLYTESINTHEBODYBESIDESTHIS,THETEMPERATUREINTHEDRYERCANNOTBEHIGHERTHAN65ASABOVETHISTEMPERATURETHEPLASTERISDESTROYEDTHENECESSITYOFFINDINGASUBSTITUTEFORPLASTERWASINCREASEDWHENTHEPORCELAININDUSTRYBEGANINSTALLINGSEMIAUTOMATICMACHINESFORMOLDINGANDDRYING,WITHINTENSIFIEDDRYINGCONDITIONSTHESEARCHFORASUBSTITUTEFORPLASTERBEGANINOURFACTORYIN1967,ANDTOTHISENDAGROUPWASORGANIZEDCONTAININGTHEFOLLOWINGWORKERSAVSAVELEVA,PSPOLYAKOV,TAPASHKOVA,VAKHOLKIN,AVSARICHEV,FILISOV,ANDOTHERSATTHESTARTOFTHEIRWORKTHERESEARCHGROUPWEREGUIDEDBYDATAFROMTHESTATECERAMICSRESEARCHINSTITUTE1HOWEVER,THISDIDNOTANSWERANUMBEROFQUESTIONSARISINGFROMTHEWORKINGOFTHEPLANT,SUCHASHOWTODESIGNANDMAKEPRESSMOLDSSOASTOAVOIDCRACKINGINTHEPLANEOFINTERSECTIONOFTWOSURFACES,WHATBATCHTOTAKEPERUNITVOLUMEOFMOLD,WHATSCHEDULETOUSEFORTHEHEATTREATMENT,HOWTOOBTAINUNIFORMDISTRIBUTIONOFPORESANDINCREASEGENERALPOROSITY,ANDHOWTOAVOIDADHERINGBYTHEBODY,ETCFOLLOWINGONTHERESULTSOFTHEIRRESEARCH,IN1969THEGROUPBEGANDEVELOPINGTHEPREPARATIONOFPVCMOLDS,ANDCONVERTINGTHEPRODUCTIONLINEOFTHEFACTORYTOTHEIRUSEATTHEPRESENTTIMETHEREAREINTHEFACTORYFIVEPRODUCTIONLINESFORPLATES,THREEOFWHICHAREFORSHALLOW200MMPLATESANDTWOFORDEEP200MMPLATES,ASWELLASSEVENLINESFORCUPSUSINGTHEPLASTICMOLDSATOTALOF24,000PLATESAND3537,000CUPSAREPRODUCEDPERDAY24HTHEPROVISIONALANNUALSAVINGACCRUINGFROMTHEINTRODUCTIONOFONLYONEPRODUCTIONLINEIS2500RUBLESTHEWORKINGLIFEOFTHEPLASTICMOLDSINCUPPRODUCTIONREACHES4000CYCLESANDCANSTILLBEINCREASEDTHELIFEOFTHEMOLDSINPLATEPRODUCTIONHASSTILLNOTBEENDETERMINEDASECTIONFORPREPARINGTHEMOLDSWASORGANIZEDINTHEFACTORYIN1969FIG1THERAWMATERIALWASDOMESTICPOLYVINYLCHLORIDELATEX,GRADEL5,OREMULSIFIEDPOLYVINYLCHLORIDE,GRADEE62POLYVINYLCHLORIDEISTHEPRODUCTOFPOLYMERIZATIONOFVINYLCHLORIDEITISAWHITEFINELYDISPERSEDNORESIDUEONNO0056SIEVEPOWDEROFDENSITY141G/CM3ATATEMPERATUREOF170180ANDUNDERSLIGHTPRESSURESPECIFICPRESSURE005KG/CM2THEPOLYVINYLCHLORIDEPARTICLESMELTANDCOHERETHEFIRSTSTAGEINTHEPREPARATIONOFTHEMOLDSISAPRELIMINARYVIBROMOLDINGONTHEVIBROTABLEWHICHENSURESUNIFORMPOROSITYTHEVIBROTABLEPERFORMS50OSCILLATIONS/SECWITHANAMPLITUDEOF05RAMTHEVIBROMOLDINGISCARRIEDOUTFOR1520SECTHISPRELIMINARYVIBROMOLDINGISANESSENTIALPARTOFTHEPROCESSFORMAKINGTHEMOLDS,SINCE,DURINGMOLDING,INTERNALSTRESSESAREGENERATEDWHICHARECONCENTRATEDNEARTHEPOINTSOFCONTACTOFMOLECULARCOHESIONOFTHEFINEPARTICLESTHISINTERNALSTRESSISESPECIALLYDANGEROUSDURINGTHEPROCESSOFSINTERINGITCANBEREMOVEDBYVIBRATION,WHICHALMOSTCOMPLETELYBREAKSALLCONNECTIONSBETWEENPARTICLESANDENSURESTHEIRUNIFORMDISTRIBUTIONTHEBASICPIECEOFEQUIPMENTINTHEPREPARATIONOFTHEPLASTICMOLDSISTHEMETALPRESSMOLDFIG2WHICHISMADEFROMGRADE45ORST3STEELITSINTERNALSURFACEMUSTBECHROMIUMPLATEDDULEVOPORCELAINFACTORYTRANSLATEDFROMSTEKLOIKERAMIKA,NO3,PP79,MARCH,197291972CONSULTANTSBUREAU,ADIVISIONOFPLENUMPUBLISHINGCORPORATION,227G/EST17THSTREET,NEWYORK,NY10011ALLRIGHTSRESERVEDTHISARTICLECANNOTBEREPRODUCEDFORANYPURPOSEWHATSOEVERWITHOUTPERMISSIONOFTHEPUBLISHERACOPYOFTHISARTICLEISAVAILABLEFROMTHEPUBLISHERFORI500147,13500L23456FIIO987FIGIFIG2FIGIIHANDPRESS2SNOLELECTRICALLYHEATEDCABINETFORHEATTREATMENTOFTHEMOLDS3CABINETFORCOOLINGTHEMOLDS4TABLEFORASSEMBLYANDDISMANTLING5STANDFORPREPAREDMOLDS6STORAGEFORTHEPLASTICS7ELECTRICALLYHEATEDCABINETFORDRYING8STANDFORFINISHINGTHEMOLDS9TABLEFORPACKINGPLASTICSI0TABLEFORMEASURINGOUTPLASTICSIIVIBRATINGTABLEFIG2PRESSMOLDAASSEMBLEDBDISMANTLEDTHEPROCESSOFFILLINGTHEPRESSMOLDFORMAKINGFLATWAREPLATESPLASTICMOLDSISSHOWNINFIG3L5POWDER,WHICHHASPREVIOUSLYBEENDRIEDINTHEELEETRODRYINGCABINETATLL0ANDTHENSCREENEDTHROUGHANO05SIEVE,ISCHARGEDINTOTHEMATRIXOFTHEPRESSMOLDANDLEVELEDWITHASPECIALTOOLTHEAMOUNTOFPLASTICDEPENDSONTHETYPEVOLUMEOFTHEMOLDFORSHALLOW200MMPLATESITIS600G,FORDEEP200MMPLATES660G,FORSAUCERS400G,ANDFORCUPS500515GTHEPRESSMOLDPUNCHISTHENINSERTEDINTOTHEMATRIXINSUCHAWAYTHATITENTERSUNDERITSOWNWEIGHTUNTILITISINCONTACTWITHTHEPLASTICTOCHECKTHECORRECTNESSOFASSEMBLYATTHISPOINT,THEPUNCHISROTATEDRELATIVETOTHEMATRIXTHEASSEMBLEDPRESSMOLDISPLACEDONTHEVIBROTABLEANDCOMPACTEDFOR1520SECAFTERCOMPACTING,THEGAPBETWEENTHEMATRIXFLANGEANDTHEPUNCHFLANGESHOULDBE810RAMTHEPRESSMOLDISNEXTINSERTEDINTOSNOLELECTROCABINETFORTHEHEATPROCESSANDAWEIGHTISPLACEDONTHETOPSOASTOGIVEAPRESSUREOF005KG/CM2TOMONITORTHETEMPERATURE,ATHERMOMETERISINSERTEDSOTHATITTOUCHESTHECENTEROFTHEPUNCHASMALLAMOUNTOFTHEPLASTICISHEAPEDONTHEPUNCHFLANGE,ANDITSCHANGEINCOLORISUSEDTOASSESSTHEREADINESSOFTHEMOLDTHEHEATPROCESSCONTINUESFOR23HANDATITSCOMPLETIONTHETEMPERATUREOFTHEPRESSMOLDIS170175AFTERTHECOMPLETIONOFTHEHEATPROCESS,THETHERMOMETERISREMOVEDANDTHEPRESSMOLDTAKENFROMTHECABINETANDPLACEDINTOTHEVENTILATEDCABINETTOCOOLTHEPRESSMOLDISTHENDISMANTLEDUSINGANEXTRACTIONSCREWTHEPREPAREDPLASTICMOLDISREMOVED,TRIMMEDSMOOTHATTHEEDGES,ANDAFTERINSPECTIONISREADYFORUSETHEMOLDSFORTHEHOLLOWWARESCUPSWEREPREPAREDACCORDINGTOTHEFOLLOWINGSCHEDULETHECORRECTAMOUNTOFPVCPLASTICWASPUTINTOTHEMATRIXFIG4ANDLEVELEDOFFTWO2224MMTHICKSPACERSWEREPLACEDONTHEFLANGEOFTHEMATRIX1,ANDTHEMATRIX2LOWEREDONTOITSOTHATTHERINGFLANGEWASRESTINGONTHESPACERSTHEPUNCH3WASTHENLOWEREDINTOTHERINGSOTHATITSFLANGEWASLEVELWITHTHERINGFLANGETHEASSEMBLEDPRESSMOLDWASTHENTURNEDOVERANDPLACEDFLANGEDOWNONTHEVIBROTABLE,WITHTHEPUNCHFLANGESTANDINGONA50X50MMBLOCKTHESPACERSWERETHENREMOVEDFROMUNDERTHERINGFLANGE,ANDAWEIGHTOF810KGPLACEDONTHEBOTTOMOFTHEMATRIX,POSITIONEDTOTHATITSCENTERLAYONTHEAXISOFTHEPRESSMOLDTHEVIBRATORWASTURNEDONANDTHERINGHELDBEHINDTHEFLANGEVIBRATEDTHEPLASTICFOR1520SECAFTERVIBRATINGTHECLEARANCEBETWEENTHEFLANGESOFTHEMATRIXANDPUNCHSHOULDBEABOUT57RAM,ANDBETWEENTHEPUNCHFLANGEANDTHERINGABOUT10MMTHEPRESSMOLDWASTHENTURNEDOVER,AND56MMTHICKPACKINGLAIDONTHEPUNCHFLANGE,ANDTHENTHEWEIGHTPLACEDONTHISWHICHGAVETHEPRESSUREOF005KG/CM2FORTHEHEATPROCESSTHEPRESSMOLD,WITHTHEWEIGHT,WASPLACEDINTHEELECTRODRYINGCABINETONAFIRECLAYBASE68CMTHICKTHEHEATINGPROCESSWASCARRIEDOUTACCORDINGTOTHEGRAPHFIG5FOR152HUPTOATEMPERATUREOFOF180185THETEMPERATUREWASMONITOREDBYAMERCURYTHERMOMETERATTHEENDOFTHEHEATTREATMENTTHELOADWASREMOVEDANDTHEPRESSMOLDTAKENFROMTHEELECTROCABINETANDPRESSEDONTHEHANDPRESSUNTIL148FIG3TC160_IU/020406080LOOTIME,RAINFIG4FIG5FIG31STOPWASHER2RING3PUNCH4DIE5POLYVINYLCHLORIDEFIG41MATRIX2RING3PUNCH4SCREW5MOLDFIG5HEATTREATMENTGRAPHSFORPROCESSINGPLASTICMOLDS200MMDIAMETERPLATES1FORCUPS2FORSHALLOWTHERINGANDPUNCHFLANGESMADECONTACTWITHTHEMATRIXFLANGEAFTERRETAININGUNDERTHEPRESSFOR10MINTHEPRESSMOLDWASREMOVEDANDPLACEDINTHEVENTILATEDCABINETTOCOOLDOWNTO4045THEPRESSMOLDWASDISMANTLEDANDTHEPREPAREDPLASTICMOLDEXTRACTEDAFTERTRIMMINGITWASREADYFORUSEEXPERIENCEINTHEPREPARATIONOFTHESEPOLYVINYLCHLORIDEMOLDSANDINTHEIRUSEINTHEFACTORYHASSHOWNTHATDEVIATIONFROMTHEABOVEPREPARATIONSCHEDULESLEADSTOTHEAPPEARANCEOFVARIOUSFAULTSINTHEMOLDSWHICHSHOWUPDURINGTHEPROCESSOFFORMINGWARESWITHTHEMUNDERPRESSING,POROSITYOFTHEMATERIALUNDERTHESHOULDERSOFTHEHOLLOWMOLD,RINGCRACKSONTHESTEMOFTHEHOLLOWMOLDCONSTANTCONTROLOFTHEELECTRODRYINGCABINETBYMEANSOFTHETHERMOREGULATORENSURESAUNIFORMTEMPERATUREINTHECHAMBERDURINGTHEHEATTREATMENTOFTHEPRESSINGS,ANDENSURESUNIFORMHEATINGOFTHEPLASTICFORALLSECTIONTHICKNESSESTHERESULTANTUNIFORMITYOFSINTERINGPREVENTSTHEPRODUCTIONOFAMOLDWITHDIFFERENTCOEFFICIENTSOFTHERMALEXPANSIONBETWEENTHEEDGESANDCENTEROFTHEPLASTICTHISGREATLYREDUCESTHEOCCURRENCEOFCRACKSINTHEWORKINGSURFACEOFTHEMOLDDURINGUSEANDINCREASESITSWORKINGLIFEACCUMULATEDEXPERIENCEINTHEUSEOFTHEMOLDSINTHEFACTORYHASSHOWNTHATITISNECESSARYTOPAYATTENTIONTOCAREFULADJUSTMENTOFTHEMOLDHOLDERUNDERTHEPEDESTALOFTHESEMIAUTOMATICMACHINESELECTIONOFTHEMOLDINGSCHEDULEAVOIDINGSUDDENLOWERINGOFTHEROLLERATTHEMOMENTOFCONTACTWITHTHEBODYTHESELECTIONOFTHECORRECTSPEEDFORTHEMOLDINGROLLER500550RPMFORCUPSAND250275RPMFORPLATESANDFORTHEMOLDHOLDER750800RPMFORCUPSAND300500FORPLATESINORDERTOAVOIDTHEPRODUCTIONOFSCRAPINTHEFORMOF“HUMPERS“AND“WHIRLERS“FAILURETOOBSERVETHESEREQUIREMENTSCANALSOLEADTODAMAGETOTHEMOLDCHIPPINGOFFTHESHOULDER,ANDDIGGINGOUTTHEBOTTOMWITHHOLLOWWARETHEMOLDSWHENPRODUCEDVARYINCOLORFROMROSETODARKBROWN,ACCORDINGTOTHEDURATIONOFTHEHEATTREATMENTATCONSTANTPRESSUREANDTHEFINALTEMPERATUREINTHEELECTROCABINETTHEDARKBROWNONESHAVELOWPOROSITY,ANDINPRACTICECANNOTBEUSEDTHEROSECOLOREDONESHAVEADEQUATEWORKINGPROPERTIES,BUTTHEIRLOWMECHANICALSTRENGTHSIGNIFICANTLYREDUCESTHEIRWORKINGLIFEOBTAININGTHENORMALWORKINGPOROSITYOF3135,WITHUNIFORMLYDISTRIBUTEDPORES,ANDATTHESAMETIMERETAININGTHENECESSARYMECHANICALSTRENGTH,WASONEOFTHEMOSTDIFFICULTPROBLEMSINTHEPRODUCTIONOFTHEMOLDSIFTHEHEATTREATMENTWASFORCED,THISRAPIDLYLEDTOTHEAPPEARANCEOFASURFACECRUSTWITHARAWINTERIORINTHEMOLDIFTHEFINALTEMPERATUREWASRAISEDABOVE210INORDERTOSPEEDUPTHEHEATTREATMENT,THISLEDTODECOMPOSITIONOFTHEPLASTICWITHTHEEVOLUTIONOFGASESWHICHDESTROYEDTHESURFACEOFTHEMOLDAFTEREXTENSIVEINVESTIGATION,THEOPTIMUMHEATINGSCHEDULEFORTHEPLASTICINTHEPRESSMOLD,WHICHGAVEMOLDSOFTHEDESIREDQUALITY,WASFOUNDANDISSHOWNINFIG5FROMEXPERIENCEINTHEPREPARATIONANDUSEOFTHEMOLDS,THECORRECTAMOUNTOFPLASTICPERUNITVOLUM
人人文库> 全部分类> 教育资料 > 幼儿教育

温馨提示

  • 1. 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

最新文档

评论

0/150

提交评论