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外文翻译--自动焊接操作系统.doc

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外文翻译--自动焊接操作系统.doc

AnautomatedweldingoperationplanningsystemforblockassemblyinshipbuildingKyuKabCho,JungGuySun,JungSooOhAbstractTheblockassemblyprocessisoneofthemostimportantmanufacturingprocessesforshipbuilding.Sinceblockiscomposedofseveralsteelplatesandsteelsectionswithpredeterminedshapesaccordingtoshipdesign,theweldingoperationplanningtoconstructablockisacriticalactivityforshipbuilding,butthisactivityhastraditionallybeenexperiencebased.Thus,itisrequiredtodevelopanautomatedweldingoperationplanningsystemtoassembleblocks.Thispaperdescribesthedevelopmentofanautomatedweldingoperationplanningsystemforblockassemblyinshipbuilding.Basedontheinformationaboutparts,topologicalrelationshipbetweenpartsandassemblysequencesforblock,thedevelopedsystemperformsthedeterminationofweldingpostures,weldingmethods,weldingequipmentandweldingmaterials.Thedevelopedsystemimplementedsuccessfullyforrealblocksconstructedinshipyard.KeywordsBlockassemblyExpertsystemOperationplanningWeldingprocess1.IntroductionShipbuildingistraditionallyalaborintensiveassemblyindustrythatemploystheweldingprocessasabasicproductiontechnology.Inshipbuilding,thereareseveraltypesofmanufacturingprocessplanningforcuttingandbending,assembly,outfitting,anderection.Amongtheseprocessplanningactivities,theassemblyprocessplanningisbyfarthemostimportant,sincetheconstructionprocessforahullblockcomprisesapproximately4850ofthetotalshipbuildingprocess1,2.Themainoperationforblockassemblyistheweldingoperation.Theweldingoperationplanningproblemsinblockassemblyareverydifficulttosolvebecauseallblocksaredifferentinsize,type,andconstitutingsubassembliesthatdependonthetypesofships.Also,sincethisactivityhastraditionallybeenexperiencedbased,weldingoperationplanninginshipbuildinghasbeenperformedmanually.Thus,itisveryimportanttodevelopanautomatedweldingoperationplanningsystemforshipbuilding.Thereisrelativelyverylittleliteratureavailableonautomatedweldingoperationplanningsystemsforshipbuilding3,4.Thispaperdealswiththedevelopmentofanautomatedweldingoperationplanningsystemforblockassemblyinshipbuilding.TherulebasedexpertsystemforweldingoperationshasbeendevelopedusingSmartElementsasanexpertsystemtool.Thedevelopedsystemisdemonstratedandverifiedbyusingactualblocksintheshipyard.2.Developmentofanautomatedweldingoperationplanningsystem2.1.SystemframeworkTheautomatedweldingoperationplanningsystemdevelopedinthispaperconsistsoffourmodulesweldingposturesmodule,weldingmethodsmodule,weldingequipmentmodule,andweldingmaterialsmodule.TheframeworkofthissystemisshowninFig.1.2.2.DeterminationofweldingposturesThismoduledeterminesthepostureoftheweldingoperator.Weldingpostureisreasonedbyconsideringconnectiontypesandpositionaldirectionbetweentwoconnectedparts,directioninformationofassemblybasepart,existenceofturnover,andassemblylevel.ConnectiontypesareclassifiedintobutttypeBandfillettypeT,asshowninFig.2.Thefourtypesofweldingpostures,downpostureD,overheadpostureO,horizontalpostureH,andverticalpostureV,areconsideredinthispaper,asshowninFig.25,6.Themoststableandeasiestweldingpostureisthedownweldingposture,andthemostdifficultoneistheoverheadweldingposture.Theweldingoperatordeterminesanefficientweldingpostureaccordingtotheworkingconditions.Forrelationshipofconnectionbetweentwopartsthatarewelded,onepartisconsideredasthebaseandtheotherisconnectedtothebase.ThepartthatisconsideredasabaseisrepresentedasPartFromandtheotherthatisconnectedtothebaseisrepresentedasPartTo.ThelevelsofblockassemblytoassemblesteelplatesandsectionsintothefinalblockareclassifiedintosubassemblySAlevel,unitblockassemblyUBAlevel,andfinalblockassemblyFBAlevel.SubassemblylevelsmaybedividedintosmallsubassemblySSAlevelsandintermediatesubassemblyISAlevelsaccordingtothesizeandweightofthesubassemblyasshowninFig.3.Fordeterminingweldingpostures,theblockassemblylevelsareclassifiedintotwogroups.Thefirstgroupisthesmallsubassemblylevelthesecondgroupconsistsoftheintermediatesubassembly,theunitblockassembly,andthefinalblockassemblylevels.Thereasonforthisgroupingisthatthereisnoturnoverprocessinthesmallsubassemblylevel,buttheassemblylevelsbelongingtothesecondgroupmayhaveturnoverprocesses.Turnoverprocessescausethechangeofweldingposturesthataredeterminedbeforetheturnoverprocess.2.2.1.DeterminingweldingposturesinthefirstgrouplevelThefollowingareexamplesofrulestodeterminetheweldingpostureforasmallsubassemblylevel.TheconnectiontypesofweldingjointsbetweentwopartsusedinthisruleareButttype0andTtype1.1IFPartLevelSmallAssemblyConnectionType1DirectionofAssemblyBaseConnectionDirectionPartFromnotAssemblyBasePartPartTonotAssemblyBasePartTHENWeldingPostureH

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