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外文翻译--对输送机用于食品输送系统的调查设计和制造 英文版.pdf

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外文翻译--对输送机用于食品输送系统的调查设计和制造 英文版.pdf

IntJAdvManufTechnol20551–9DO10.7/s0131843RIGNLARICLES.HMasoodB.AbasE.ShaynA.KarnivestigtioitdesigndmnufactringofmechaniclcoverstemsforfdpcessingRecived29March2003/Aceptd21June2003/Publishedonline23June2004©SprngerVelgLondonimtd2004AbstacThispaperpresnttheresultofaresrchinvestigaionundertakentodevelopmhodologindthniquehawlreduchecosandtimoftdesign,mnufuringandasmblyofmehanilconveyortemusedinthefoodbevergeindustry.Theimprovedmhodologyfordesignaproductonofconveorcomponentsibaseontmnimtiofmaerils,patsandost,usngtherulsofsiformanufcturnddeignforsembly.Restobtainedonatesonveyorstemverythebenefitsofusimprovechnique.Theovealmeialcoswareducdby19andtheoveralsemblycostwsrducedby20comparetoconventionamthods.KeywordsAemblyCostreductionDesignFADMMchanialconveor1IntroductinConveyrstemusedithefoodandbeverageindustryaehighlautomdctommadestructuresconsstngoflgenumberofpartsandsigneocayproducuchasfoodcatons,drinkbotlecansinfsttionndemblylines.Mostoftheprocsingndpackagingoffoodadrinknvoecniuosperatowherartons,btlesorcnsrequirdtmoveatcontolldspeforfilioramblyopeations.Theiroperionsrequirhighlyecntndrelimechanialconveyos,hichangefromoverheadtpstofloormountedtpeofchain,rolleorbeltdrivenconveyrems.Inrcntars,mmensprsurefromlientsforlowcostbuteffiimeniclonveyortmshapushedonveyormanufcturrstoreviwtheicurrentdesignandsemblymethodsndlookanltnavemanstomanufcturmorconomialreliblconveyorsforheirlients.Apresnt,S.HMasoduB.AbasE.ShaynA.KarIndutrilRearchIntiuewibure,wibnUivsiyofTcnolgathor,lbur312,straiEmilsmadswin.edu.amostmaterilhandlingdevices,bothhardwarendsoftware,highlyspecaised,nflexiblandostlyoconfigur,inslndmintn1.Conveyorsfixedinermsoftheirloctonstheconveorbeltsacordingtohenchronisedpeeds,makinganyhangeoveroftheconveyrstemverydifficultndexpensive.Intodaysadilhangingindustialmkes,herisaneedtoimplemntnewmanufctursregy,newytemoperonalconcptandsyemontoloftarendhardwaedeveopmentconcept,thacanbeppliedohedesignofnegenerationofopen,flxiblemtrilhandlingytem2.HoandRnky3proposedanewmodulandreconfigurabl2D3Dconveyorstm,hichencompasanopereconfigurablesoftwaechieturbasdontheCIMOSAopensytemrchiurmodel.Iisnotetharesarchithearofimprovementofconveyormsusinbevegeindustsverylimtd.Mostofthepublihedresarcisdirectdowardsimprovingheoperaionsofconveyotmandintgrtionofstemtohighlysophistiaesoftwarehardwre.Thipaperprsntarerchnvetigaonimdatimprovingthecuretchniquesandpracesusnhedesign,manufingandemblyoffloormounttypechaindrvenmechanilconveorsinordertoeductmanufturingladtimandostforuchconves.Applingtheconceptofconcurrentngineeringandtheprincplesofdesignformanuftingadesignforsembly4,5,veralctalconveyorpatswernvetigadfortirfunctionaity,merisuitabilit,ngthciron,costandesofasemblntheoverconveyorstem.Therilpartwrmodifidandedesigneditnehapeageomety,andsomeithnewmatrl.Themproveddesignmhodsthefunconalityofnewconveyorpatswerverfiedandtesdonanetesconveyorstemdeigned,manufcturembldusingtheimprovedrts.2DesignfornufctringdsemblFMAInrecntyears,earchintheareofdesignformanufcturingandsmblhabeomveyusfulorndustrieshaareon52sideringmprovingtheirfaciltesandmnufacturingmethodology.However,trehasnotbennoughworkdoneinheareofsignforconveyocomponents,epecialyrelatdotisuencreasingnumbersofdraingdatndngineerngoftheprocofcdesignbasedonraditionalmthods.EmphasiestandardisationUthemplposbleoperationsseoperationsofknowncpabilyMinimseupsandinterventindertakengineerngchangesnbatchesAvasamountpapershavebenpublihehaveinvestigatediuesrelatdoDFMAandppletovariousmethodologisoachivesulttprovedconomial,fficntandcosteftiforthecompaniesunderinvestgaon.ThemanlasifiationsofFknowledgecanbeidentifieds1Generlguidelnes,2Companyspeifistpraccor3Procsandorreourcepecifionstrant.Generlguidelineseftogelyappliblrulesofhumb,rlatingtoamnufcuringdominofwhichthedeigneshouldbewre.ThefollowlsthabeenompiledforDFMguidelines6.Thesedeignguidelishouldbehoughtofasoptimalsuggetions.Theytpcaywilresultinahighqualty,owcos,andmnufacurblesgn.Oconalycomprisemustbemde,ofours.Intheeas,ifaguidelnegoeagainstamrketingorperformancrquiremnt,thextbestlternaiveshouldbeselctd7.Companypecifipraticerfstoinhousedesignrulesacdevelops,usualyovealongperodoftm,andwhihthedesignerisexpectedoadhereto.ThesedeirulesareintifiedbytheompanyscontibutingtoimprovedqualityndfcncyrecognisingtheoveralelonshipsbetwenDesignforaminimumnumberofpartsvelopmodulrdesignMinimsepatvaiatonsgnrsobemulfunctionalDesitformtiuseparsasoffabrictonAvoidetftenerMaximiscompliancdesignforeasofasemblynimehandlnghandlingprnttionEvaluatasmblymethodsimnaedjustmntsAvoidflxiblecomponetheyaredifficultohandleUsepartsofknownapabililowformaximumintolerancofpartsseknownndprovevendorsndupplierpartsadertedvaluewithnomarginaloversteMinimeubasmblispartiularprocsanddegndecisons.Companiesussuchguidelnespartoftherinigiventodesignerofproductrequiringignificantmountsofmanualaemblyormaintenanc.Notethamostoftmethodologisrgoodtherbeiquickandsyosarorbeingmoreformalndquantitave.Forexampl,guidelinesbyBoothroydDewhurst8onDAarconsiredaquantitavesytmaic.WherestheFMguilis,whichremlruleofthumbdeivedfomexperiencprofeionals,amorqualiavendlesormal9.3ConvetionlconveorstedsignDesignandmnufacturingofonveyrstemisaverycomplxtimeonsumproces.Aveconveostemisacustommadeproduct,achojctvariesfromerotherprojeintermsofsizeproductandlyout.ThesytmdesignFig.1Layoutfconveyrstemforlbeligplasibtl53isbaedonclientrquiremntsandproductspecifiations.Moreover,thesytmlayouthatofitinthepaeprovidedbythecompany.Tprocesofdesigningalyoutforaconveyorsteminvolverviionsandcouldtkefromdastomonthsorinsomnstancesyrs.Onewihheminimumcosandmximumclientsuibilitmostlkeytogetapproval.Fgure1showaschemilutoftypicalonveyorsytminstaldinproductonineusedforlbeingofplacbotes.Dferntsecionsoftheconveorstemaridentifibypecifithnialnames,whihaecommonlyusednsmilarndusrilpplicton.Tsinglizrsectionnabletheproductoformntoonelanefommultipllanes.Tslowdownablerducesthepeedofproduconceitxitfromfilr,lbel,c.Tmasflowsectionsusdokeepupwithhighspeedproce,.g.,filr,labeler,tc.Thetransferabletransfrsthedirctionofproductflow.purposofthesdifntconveyoseonsishusocontroltproducflowthroughdiferntprocngmachines.Atypicalmehanicalonveyorstemusdinfoodandbeverageppltionsistofovetwhundrmechanillctilparsdependingonthesizeofthesytm.Someoftheommonbutentialcomponenthacouldbestandardisedandcumulatdofmilesoftonveoryemdefrms,paerbas,ndplat,coverplates,insdebendplate,outidebendplateberksndhafdrve,tailslve.Theszequantiyofthesepartsvaryacordingotheengthofconveyorsctonsandnumbeofksrespondingtowidthandpesofchainsrequird.Theproblmandshorcomingsnthecurrntdesgn,manufcturingandsemblyofmehanialonveyosaevarid,butinclude4AreasofimproventInordertoidentifythearesofcostrductionnmaterilandlabour,acostanalsioflminonveyorpaswconductedtoestimhepercentagecostofeachtirelationtoheotalcosofalsuchparts.Thepurposofhisnayssidentifytcritl,whichareminlyreponsibleforincreasngheosoftheonveyondthebyinvestgamansforducitcsucparts.Table1showtostanaliofa50sectiononveyorstem.henalyirevelsha12out15paronstiute79oftotamtalcostoftheconveyorstem,wherfurtherimprovementsindesignoreducthecosipossible.Outofthes,vepartwerdentifidasritalparthownbyaaerikTabl1constutngmximumnumbeofcomponentsnquantityndomprisover71ofoveralmterialcost.Amonghese,threcomponentslegst,idefmndsupporchannelwrfoundtoacountfor50oftheotalconveyormateicost.Adeilednalysieachse12partswcdoutonsirngtheprncplsofoncurrntngineeing,designformanufctureanddeignforaembly,andamprovesiwsdevelopedforechs10.Detilsofsimprovementofomesltmajorcomponentareprntedbelow.5RedsignoflegstseblInaconveyrstm,thelgsaremountdonthesideframetokeeptheenticonveyorstmoffthefloor.Texitngdesignofcorlgswork,butyarecoslytomanufcur,theyOverdesignofsomepartsHighcostcomponentLonghoursinvolvedinasembly/maintenancUseofnontandarparthavestabiityproblems,andcusdesindeliveries.Tlaiusualcusdbyomofthepartnotarvingfomoverseauppliersontime.TmoscilspecifiationsrequidfortheconveyolgsarTable1.ConveyrcitalprtsbaedonpartscotanlysiProductsriptLegst∗Sidframeupotchnel∗BenraksRt.lft∗TishftSpacerb∗uotwarstip∗rsidertiEndplatCovereBltsTrquarmbracketSlotcveInsidnpltQty68048139540132981978MaterilusedPlasticlegStube2.5mmChnlPlastic20d.Sshaft35itinleselX6401mmplasticPlastic2.5mm/S16mm.mm/mmSplatetainles2.5mm/Cost20.1675.436.7025.436.018.57129.07.6ImprovemntposibleYs/NoesYsNoesYsesNoYessetal∗Critclparts154StrengthtocaryonveyorloadabiliyEseofsemblaflxibilityforadjustingheight1andpart3inFig.2wasnotrigidenough.Theconnetionsforthesesareonlyingl6mmbolt.Atimes,whenconveyortmscarngfullproducloadstasobservedthatconveyorlegseunstablendcausedmchanilvibraion.OneofthemairsonsforthiswduetoasingleboltFigure2indicateslthepartsfortexistingdesignoftheconveyorlg.Theindicaednumberarhepartnumbersdesribedinable2,whihlsohowsbrekdownofcostanalycompletithlabourtimerquirdtoasemblompletstoflgs.Theexistinglgsupconsiofplticlegbrackeorderedfromoverea,tinlestelgtubes,whihreutintospecifisiz,lubeplaicdjusmntcaclppeontthelegtubeathebottomshowniFig.2.Lugs,whicharecutinsquaresiz,driledandeldedtohelegtubetoboltnglrosbracngndbackingplatsupportlegbrackests.TheofpartsinTable2signifienumberofomponentineachrtnumbethequantitystheconsumptionofpartilegdesign.Companiehaveusedthidesgnformanyyeasbutoneoftcmoncomplaintsreportdbytheclintwoftheinsabilityoflegs.Fromaninianvestigaon,tbecmearthatheconnetionbetwthestinleelubandplsticlegsbraketpartFig.2ExistngledsignasemblywithpartnameshowTab1Table2.Costanlysiforldegsinasemblyconnetionaechndofthelugsinpar3apar7.Theabiliyofheonveyoriscideredctilmteandequirsrectfiatimmediatltatsfyusomrxpections.Consderingheproblemofheexistingonveyorlegdesignandtheclentsfrncs,anewdegnfortheconveyorlegwsveoped.Genealyttbilityandtsrengthofthegserconsiderdsheprimarcreiforimprovementinthenewsgnproposlbutotheonsderatonswertsmplcyofign,minimsationofoversepasndasofaemblathepointofcommoning.Figur3how,thenewdesignofconveyorslegasmbly,andTblegivesacrptonandtostofchpart.Figure3showhahenewdesignconsistofonlyfimainpartsfortheconveyorslegcomredtoeghtmanpartstheolddeign.Intolddeign,tplasiclgbrcket,helegtubeplastcdjusmentandhelegtubeerthemosxpensiveiemsountingfor72oftcosoflasmbly.IntnewPrtn.15,647238PartscriptolasticlegbracketLeupstidjustmnAnglcrosbracigBakiplteLetuolsofparts24126Qty2126Cost30.284.50.23.0SourceOversaInhouseIsnhouIseTtaemblycostwelding15l19174.

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