文档简介
GSELIGERETALEDS,ADVANCESINSUSTAINABLEMANUFACTURINGPROCEEDINGSOFTHE8THGLOBALCONFERENCE149ONSUSTAINABLEMANUFACTURING,DOI101007/9783642201837_22,SPRINGERVERLAGBERLINHEIDELBERG2011METHODOLOGYFORHIGHACCURACYINSTALLATIONOFSUSTAINABLEJIGSANDFIXTURESJJAMSHIDI,PGMAROPOULOSDEPARTMENTOFMECHANICALENGINEERING,UNIVERSITYOFBATH,UKABSTRACTTHEABILITYTOACCURATELYMEASURETHECOMPONENTSOFJIGSANDFIXTURESDURINGTHEIRINSTALLATIONDETERMINESTHESTATEOFTHEIRPRECISION,ESPECIALLYFORLARGESIZEPRODUCTSANDAPPLICATIONSTHISMATTERISCRUCIALINMASSCUSTOMISATIONWHERESMALLBATCHESOFPRODUCTSANDCOMPONENTSWITHHIGHVARIETYINDESIGNAREMANUFACTUREDPRODUCTQUALITYSHOULDBEINHARMONYWITHRAPIDCHANGEOVERPHILOSOPHYASCOMPROMISINGQUALITYFORSPEEDISNOTFORGIVABLEFORSENSITIVECOMPONENTSANDASSEMBLIESSUCHASTHOSESEENINTHEAEROSPACEINDUSTRYITISNECESSARYFORTHEINSTALLATIONOFTHEJIGSANDFIXTURESTOBEHIGHLYACCURATEINORDERTOMINIMISETHEUSEOFTOLERANCEBUDGETDUETOVARIATIONSINJIGSANDFIXTUREPOSITIONINGMAJOROVERHEADCOSTSFORJIGSANDFIXTURESPARTICULARLYINTHEAEROSPACEINDUSTRYLEDTOTHEDEVELOPMENTOFTHECONCEPTOFFLEXIBLEANDRECONFIGURABLEJIGSANDFIXTURESREUSABILITYOFRECONFIGURABLEJIGSANDFIXTURESMAKESTHEMATTRACTIVEFORSUSTAINABLESOLUTIONSASTHEIRCOMPONENTSCANBEREUSEDFORSEVERALVARIANTOFAPRODUCTORASSEMBLYTHEMAINDRAWBACKSOFTHISTYPEOFJIGSANDFIXTURESHAVEBEENTHEIRPOORACCURACYANDRELIABILITYINTHISPAPERACCURATEPOSITIONINGOFTHEKEYCOMPONENTSOFSUSTAINABLEJIGSANDFIXTURESISINVESTIGATEDTHEFACTORSAFFECTINGTHEPERFORMANCEOFTHEJIGSANDFIXTURESAREREVIEWEDFROMTHEINSTALLATIONSTAGETHEPAPERINTRODUCESAMETHODOLOGYFORMINIMISINGUNCERTAINTIESINPOSITIONINGOFTHEHOLDSANDCLAMPSFORFLEXIBLEJIGSANDFIXTURESKEYWORDSSUSTAINABLEJIG,JIGINSTALLATION,CALIBRATIONUNCERTAINTY,JIGMONITORING,METROLOGY,REUSABLEJIG1INTRODUCTIONFACTORSSUCHASQUALITYANDRELIABILITYHAVELONGCONVERTEDTOIMPLICITCHARACTERISTICSOFTHENEWPRODUCTSRECENTMARKETTRENDSHAVEFORCEDMANUFACTURINGINDUSTRIESTOMOVETOWARDSMASSCUSTOMISATIONINTHEIRPRODUCTSANDSERVICERANGEINCREASEDVARIATIONINTHEDESIGNOFNEWPRODUCTSISFOLLOWEDBYASECONDWAVEOFVARIATIONWITHHIGHERAMPLITUDEATSUBASSEMBLIESANDCOMPONENTLEVELSTATEOFTHEARTMANUFACTURINGSYSTEMSANDTECHNOLOGIESHAVEPROVIDEDMOREFLEXIBILITY,ENABLINGDESIGNERSTOTHINKMOREFREELYFORINSTANCENEWLARGEVOLUMEMEASUREMENTSYSTEMS,DEVELOPEDINTHEPASTFEWYEARS,ARECAPABLEOFMEASURINGSEVERALDECAMETREDISTANCESSUCHTECHNOLOGIESFACILITATETHEVERIFICATIONOFLARGESIZECOMPONENTSTHATUSEDTOBEMANUFACTUREDFROMSEVERALASSEMBLEDCOMPONENTSTHEMANUFACTURINGOFLARGESIZEPRODUCTSREQUIRESSPECIALISTJIGSANDFIXTURESINORDERFORTHEIRCOMPONENTSTOBEHELDINTHEDESIREDORIENTATIONDURINGBUILDANDASSEMBLYTHISREQUIRESMAJOROVERHEADCOSTTHATCANONLYBEJUSTIFIEDBYMASSPRODUCTIONINSOMECASESOROTHERWISETHECOSTOFFINISHEDPRODUCTSCANBEVERYHIGHTHISISSUECONTRADICTSWITHTHEMARKETTRENDSWHERECUSTOMERSARECONSTANTLYLOOKINGFORHIGHERVALUEFORTHEIRMONEYINATYPICALPRODUCTTHEVARIATIONINTHEPRODUCTCREATESAMORESUSTAINABLEBUSINESSASITCANFULFILTHENEEDSOFARELATIVELYLARGERMARKETFLEXIBLEANDRECONFIGURABLEJIGSANDFIXTURETHATCANBEFORMEDINDIFFERENTSHAPESTOSUPPORTDIFFERENTVARIATIONOFPRODUCTSISAKEYSOLUTIONFORTHEABOVECHALLENGESTHECONCEPTOFFLEXIBLEJIGEXISTEDFORSEVERALYEARSINTHERESEARCHDOMAIN1HOWEVER,THEYARENOTFULLYUTILISEDTOAGREATEXTENTINREALPRODUCTIONFACILITIESESPECIALLYFORLARGESIZEPRODUCTMANUFACTURERS,SUCHASAEROSPACETHISISDUETOTHECHALLENGESRELATEDTOTHEIRINITIALINSTALLATION,POORCALIBRATION,ANDREPEATABILITYTHATOFTENEXCEEDTHETOLERANCEREQUIREMENTTHEMANUFACTURINGOFTHESEJIGSANDFIXTURESFROMHIGHQUALITYKEYCOMPONENTSASWELLASTHEIRINTEGRATIONWITHLARGEVOLUMEMETROLOGYSYSTEMSCANREDUCETHEABOVELIMITATIONSTHISPAPERCOVERSMETROLOGYISSUESRELATEDTOTHEINSTALLATIONANDCALIBRATIONOFFLEXIBLEJIGSANDFIXTURESASWELLASTHEIRMONITORINGDURINGSERVICE2RELATEDWORK21MANUFACTURINGANDASSEMBLYOFLARGESCALEPARTSTYPICALLYPRIORTOPRECISIONMANUFACTURINGOFMECHANICALPARTSITISESSENTIALTOMOVETHERAWMATERIALTOTHEMACHINEBENCH,PROCEEDWITHROUGHCUTTINGTHENFINEALIGNMENTANDCLAMPINGATTHISSTAGETHEPARTISREADYFORMACHININGOFITSHIGHPRECISIONKEYFEATURESHOWEVER,THISISNOTALWAYSPOSSIBLEFORLARGESIZEAND/ORHEAVYCOMPONENTSLARGESCALEPRODUCTSREFERTOTHOSEWITHCOMPONENTSTHATARENOTECONOMICALLYPOSSIBLETOHANDLEORMOVEAROUNDINTHEFACTORYFORFABRICATIONANDASSEMBLYPURPOSES2THEMANUFACTURINGANDASSEMBLYPROCESSESOFTHESEPARTSENCOMPASSMOVEMENTOFTHEMACHINESANDSYSTEMSTOTHEDESIREDLOCATIONANDORIENTATIONWITHRESPECTTOTHESEPARTSSUCHPARTSARENORMALLYHELDINTHEIRPOSITIONSUSINGLARGESIZEJIGSANDFIXTURESIFTHESEPARTSAREPRODUCEDINSMALLBATCHSIZESTHATISTHECASEFORAEROSPACEINDUSTRIES,HIGHOVERHEADCOSTPERPRODUCTWILLOCCURTHEREHAVEBEENMANYATTEMPTSTODESIGNANDMANUFACTUREJIGSANDFIXTURESSOTHATTHEYCANHOLDANUMBEROFVARIANTSOFCOMPONENTS3,4HOWEVER,THISAPPROACHISNOTFEASIBLEFORPARTSWITHSENSITIVEORKEYFEATURESDUETOTHEIRHIGHACCURACYREQUIREMENTSJJAMSHIDI,PGMAROPOULOS150ADJUSTABLE,RECONFIGURABLEJIGSANDFIXTURESPRODUCELOWERREPEATABILITYOVERTIMECOMPAREDTOFIXEDONESFIXEDJIGSHAVEPERMANENTTOPOLOGYACHIEVEDTHROUGHTHEIRPERMANENTJOINTSTHATAREWELDEDORRIVETEDMECHANICALFAILUREOFTHESEJIGSANDFIXTURESFOREXAMPLEDUETOFATIGUEANDPLASTICDEFORMATIONISAMAINCAUSEOFTERMINATINGTHEIRSERVICEANDSENDINGTHEMFORRECYCLINGWITHSMALLBATCHMANUFACTURINGREQUIREMENTSITISNOWCOMMONTORETIREACONFORMINGJIGASTHEIRSERVICELIFEDEPENDSONTHELIFEOFPRODUCTSINOTHERWORDSSOONAFTERTHECEASEOFMANUFACTURINGAPARTSVARIANT,THEASSOCIATEDJIGSANDFIXTURESBECOMEREDUNDANTEVENIFTHEJIGSARESTILLINWORKINGORDER,THEYHAVETOBESCRAPPEDANDSENTFORRECYCLINGTHISMETHODBRINGSTHEBURDENOFHIGHENERGYCONSUMPTIONFORRECYCLINGEVENFORTHEFIXEDJIGSANDFIXTURESTHEDRIFTINTHELARGESIZEPARTSANDJIGCANAFFECTTHEACCURACYOFALARGESIZEASSEMBLY5SEVERALMETHODSFORANALYSINGJIGRIGIDITYHAVEBEENDEVELOPED6TOEVALUATETHEIMPACTOFVIBRATIONONLARGESIZEJIGSINANYCASEAMORESUSTAINABLEMANUFACTURINGCANONLYBEACHIEVEDBYALTERNATIVESOLUTIONSFIGURE1TYPICALCOMPONENTSOFLARGESCALEJIGIMAGECOURTESYOFELECTROIMPACTHTTP/WWWELECTROIMPACTCOM/G150TFIX/GALLERYASPEXTENSIVELEADTIMETOMANUFACTUREISANOTHERMAJORDRAWBACKFORFIXEDJIGSANDFIXTURESTHESEJIGSSHOULDBEORDEREDWELLINADVANCEOFANYMANUFACTURINGPROCESSESTHISCANCREATEADDITIONALCOMPLEXITYINPRODUCTIONPLANNINGANDPRODUCTTIMETOMARKETREGARDLESSOFTHEIRTYPE,LARGESCALEJIGSHAVEANUMBEROFCOMMONELEMENTSINCLUDINGONEMAINFRAME,ONEORANUMBEROFINNERFRAMES,POTENTIALLYONEORANUMBEROFMOVINGMECHANISMS,ANDSMALLERCOMPONENTSSUCHASCLAMPS,BUSHINGS,PICKUPSANDADJUSTABLESCREWSFIGURE122FLEXIBLEJIGSANDFIXTURESTHECONCEPTOFFLEXIBLEJIGSANDFIXTURESISDEVELOPEDFORINCREASEDSUSTAINABILITY,RAPIDCHANGEOVERASWELLASLOWCOSTITISNOWPOSSIBLETOUSEOFFTHESHELFMODULESANDCLAMPSFORJIGSANDFIXTURESDESIGNANDASSEMBLYDEPENDINGONTHEREQUIREMENTONLYAHANDFULOFSPECIALISEDCOMPONENTSFORTHEJIGSANDFIXTURESMIGHTBENEEDEDTOBECUSTOMDESIGNEDANDMANUFACTUREDINTHISCONCEPTTHEMAJORITYOFBULKCOMPONENTS,JOINTSATTHEATTACHMENTSAREUSEDINFORASPECIFICAPPLICATIONONCETHEPRODUCTDESIGNVARIANTISFULLYMANUFACTUREDITISTHENPOSSIBLETODISASSEMBLETHEABOVECOMPONENTSANDREASSEMBLETHEMINANEWTOPOLOGYTOSUITETHENEXTDESIGNVARIANTTHISCYCLECANBEREPEATEDOVERALARGENUMBEROFTIMESRESULTINGINREDUCEDOVERHEADCOSTFORJIGSANDFIXTURESNEEDLESSTOMENTIONTHEOTHERFACTORSSUCHASDISASSEMBLYTIME,RESETTINGTIME,OPERATORSTIMESHOULDBECONSIDEREDFOREVALUATINGTHEREALCOSTBENEFITOFUSINGTHISTYPEOFJIGSANDFIXTURESTHISAPPROACHBESTREDUCESTHECOSTOFJIGSANDFIXTURESFORTHEASSEMBLYANDCOMPONENTRANGESTHATAREFAIRLYCLOSEINDESIGNDEPENDINGONTHELEVELOFVARIATIONSINTHECOMPONENTSANDTHETYPEOFWORKREQUIREDONEACHADIFFERENTPERCENTAGEOFTHEFLEXIBLEJIGSNEEDTOBEREARRANGEDTHISMATTERISCRUCIALTOBECONSIDEREDATDESIGNSTAGEINORDERTOINCREASETHEBENEFITOFUSINGTHISTYPEOFJIGSANDFIXTURESFOREXAMPLE,WHENPOSSIBLE,THELOCATIONAND3DPOSITIONINGOFPICKUPSANDCLAMPSONDIFFERENTVARIANTSOFTHECOMPONENTOREVENTOTALLYDIFFERENTPARTSSHOULDBEINCLOSEPROXIMITYTOINCREASECOMPATIBILITYANDINTERCHANGEABILITYOFSUBSYSTEMSOFJIGSANDFIXTURESHAVINGACOLLECTIONOFTHEKEYCOMPONENTSOFTHEJIGSCANGUARANTEETHEAVAILABILITYOFTHEDESIREDJIGSINASHORTTIMEINADDITIONTOTHISTHESTORAGEOFTHEJIGSREQUIREDLESSSPACEASITISPOSSIBLETODISMANTLEALLTHEMODULESTHATARETYPICALLYINTHEFORMOFSCAFFOLDINGANDPLACETHEMNEXTTOEACHOTHERFLEXIBLEJIGSARECURRENTLYUTILISEDINSOMEOFTHEAUTOMOTIVECOMPANIESFIGURE2ASTHEIRACCURACYLEVELISSUFFICIENTFORTHISSECTORDESPITETHEABOVEBENEFITSTHEREARECLAMPMAINFRAMEINNERFRAMECOMPONENTADJUSTABLEHOLDSMOVINGMECHANISMSMETHODOLOGYFORHIGHACCURACYINSTALLATIONOFSUSTAINABLEJIGSANDFIXTURES151NOTMANYFLEXIBLEJIGSINOPERATIONINLARGESIZEMANUFACTURINGFACILITIESSUCHASAEROSPACEFACTORIESACCURACYANDUNCERTAINTYOFPOSITIONINGPINS,REPEATABILITYOFTHECLAMPSANDDRIFTOFTHEJIGSTRUCTUREAREALLCONTRIBUTINGTOTHEFACTTHATTHESEJIGSCANNOTMEETTHETOLERANCEREQUIREMENTSOFTHEPOWERGENERATIONANDAEROSPACEINDUSTRIESTHESEJIGSHAVEHIGHPOTENTIALSFORUTILISATIONINTHEABOVEINDUSTRIESONCETHEIRACCURACYPROBLEMSARERESOLVEDFIGURE2FIXTUREWITHRECONFIGURABLECOMPONENTSFORAUTOMOTIVEINDUSTRYIMAGECOURTESYOFWITTEHTTP/WWWHORSTWITTEDE/EN/THEREHASBEENANUMBEROFNEWDEVELOPMENTSINLARGEVOLUMEMETROLOGYSYSTEMSANDTECHNOLOGIESMODERNLASERBASEDMETROLOGYSYSTEMSANDTECHNOLOGIESARENOWCAPABLEOFMEASURINGLARGESIZEPRODUCTSUPTOSEVERALDECAMETRESWITHACCEPTABLEACCURACYTHESESYSTEMSCANBEUSEDTOACCURATELYPOSITIONMOUNTINGSOFTHEKEYCOMPONENTSOFTHEJIGDURINGITSINSTALLATIONANDINITIALSETUPTHEINSTALLATIONOFJIGSANDFIXTURESTYPICALLYSTARTSFORMITSBASEORMAINFRAMETHENLARGECOMPONENTSANDGRADUALLYTOTHESMALLERCOMPONENTSSUCHASPICKUPSANDCLAMPSMETROLOGYSYSTEMSCANBEUSEDFORTHEINSTALLATIONOFFLEXIBLEJIGMAINFRAMEANDITSINNERFRAMESTOGUARANTEETHECORRECTPOSITIONINGOFEACHANDEVERYCOMPONENTTABLE1SHOWSAFEWOFTHESELARGESCALEMEASUREMENTSYSTEMSFORTECHNOLOGICALREVIEWOFTHESESYSTEMSSEE7LASERTRACKERSYSTEMSCAPABLEOFMEASURINGREFERENCEPOINTS,AREAMONGTHEMOSTSUITABLEMEASUREMENTSYSTEMSFORTHISPURPOSETHEINSTRUMENTTRACKSASPHERICALLYMOUNTEDRETROREFLECTORSMRTARGETTHEPOSITIONOFWHICHCANBEREGISTEREDINTHREEDIMENSIONALSPACESMRCANBECONTACTEDDIRECTLYWITHTHETARGETOBJECTTOPROVIDEGEOMETRICALPOSITIONALINFORMATIONORCANBEUSEDWITHINAMECHANICALLYREPEATABLESMRNESTKNOWNASLASERTRACKERTARGETORINSHORTTARGETFROMTHISPOINTONLASERTRACKERSLIKEANYOTHERMEASUREMENTINSTRUMENTHAVEALEVELOFUNCERTAINTYTHATNEEDTOBEACCOUNTEDFORDURINGTHEJIGINSTALLATIONPROCESSALSOTHELINEOFSIGHTISSUESBETWEENTHELASERTRACKERANDITSTARGETPOINTSHOULDBECONSIDEREDANDIFNECESSARYMULTIPLETRACKERPOSITIONSSHOULDBEUSEDINREALMEASUREMENTACTIVITYTHERESULTMUSTBEACCOMPANIEDWITHASTATEMENTOFUNCERTAINTYSUCHSTATEMENTCHARACTERISESTHEDISPERSIONOFTHEVALUESTHATAREREASONABLYATTRIBUTEDTOTHEMEASURAND8THISISSUEISTHESAMEFORTHEINSTALLATIONANDLATERVERIFICATIONOFANYJIGORFIXTURETHISKNOWLEDGECLARIFIESTHEJIGCAPABILITYOFAGIVENPOSITIONINGANDASSEMBLYTASKINOTHERWORDITINDICATESIFAJIGCANMEETTHETOLERANCEREQUIREMENTSFORITSRELATEDPROCESSES23COMPARISONOFJIGPHILOSOPHIESTHEREAREALARGENUMBEROFDIFFERENTSHAPEANDDESIGNJIGSANDFIXTURESINDIFFERENTCOMPANIESFORVARIOUSMANUFACTURINGANDASSEMBLYAPPLICATIONSSOMEOFTHESEJIGSANDFIXTURESAREREADILYAVAILABLEINSTANDARDFORMS,WHILESOMEAREDESIGNEDANDMANUFACTUREDSPECIFICTOPARTICULARPARTSANDTASKSTHELATTERCANBEVERYEXPENSIVEBASEDONTHECOMPLEXITYANDSCALEOFTHEPRODUCTS9REGARDLESSOFCOSTANDPURPOSEAMANUFACTURINGORASSEMBLYPROCESSCANBEPERFORMEDUSINGWITHNOJIG,WITHFIXEDFRAMEJIGS,ORWITHRECONFIGURABLEORFLEXIBLEJIGSTABLE2PROVIDESACOMPARISONOFTHESEMETHODSWITHTHEIRTYPICALAPPLICATIONSFIXEDFRAMEJIGSARETYPICALLYFORHEAVYDUTYAPPLICATIONSTHEYAREMORESUITABLEFORAPPLICATIONSWITHALARGENUMBEROFPRODUCTSTHATCANRELAXTHEOVERHEADCOSTOFTHEJIGTHEREARESEVERALADVANTAGESINTHEAPPLICATIONOFFLEXIBLEJIGSANDFIXTURESFORTHEMANUFACTURINGANDASSEMBLYOFLARGEANDCOMPLEXPRODUCTSINPARTICULARFORRESEARCHANDDEVELOPMENTWORK,ASWELLASFORCASESWHERELOWVOLUMEPRODUCTSAREMANUFACTUREDFLEXIBLEJIGANDFIXTURECANBEVERYBENEFICIALINADDITIONTOTIMEANDMONEYSAVINGBENEFITSTHEPOSSIBILITYOFHAVINGAFLEXIBLEJIGGIVESMOREFREEDOMTOTHEDESIGN,MANUFACTURINGANDASSEMBLYPROCESSESDUETOTHELOWDIRECTANDRECURRENTCOSTOFCHANGINGTHEOVERALLTOPOLOGYOFTHEJIGRECONFIGURABILITYANDREUSABILITYOFFLEXIBLEJIGISAMAINCLAMPMAINFRAMEINNERFRAMECOMPONENTJJAMSHIDI,PGMAROPOULOS152ADVANTAGEFORTHISTYPEOFJIGCOMPAREDTOCONVENTIONALJIGSTHISISPARTICULARLYIMPORTANTASITISINLINEWITHTHEINDUSTRYDIRECTIONINTERMSOFGREENMANUFACTURINGBYRECYCLINGCOMPONENTSFROMAUSEDSYSTEM,REDUCINGPROJECTCOSTSWITHREGARDSTOEXPENSESFORTOOLINGOFASSOCIATEDITEMSTABLE1EXAMPLESOFLARGEVOLUME/PORTABLEMEASUREMENTINSTRUMENTSFORJIGVERIFICATIONMEASUREMENTTYPEINSTRUMENTAUXILIARYCOMPONENTSCONTACTNONCONTACTIMAGESMRPROBE9LASERTRACKERTPROBE9LASERRADARSPHERICALTARGETS9TARGETS9PHOTOGRAMMETRYLIGHTPROJECTION9LASERBASEDSCANNINGHEAD9ARTICULATEDARMCMMCONTACTPROBE93FLEXIBLEJIGINSTALLATIONTHEISSUESANDCONCERNSTHATNEEDTOBECONSIDEREDINTHEJIGINSTALLATIONPROCEDUREAREDESCRIBEDINTHISSECTIONTHEINSTALLATIONOFTHEJIGCOMPONENTSINTHERIGHTPOSITIONCANBEACHALLENGINGESPECIALLYWHENTHEPOSITIONINGTOLERANCESARETIGHTSFLEXIBLEJIGSSHOULDALSOBEMONITOREDINORDERTOEXPLOITANDCOMPARETHEIRRIGIDITYWITHTHATOFTHECONVENTIONALONESSTAGEBYSTAGEMEASUREMENTINSTRUCTIONFORTHEJIGINSTALLATIONBASEDONTHERESULTSOFANINITIALJIGSETUPINTHESIMULATIONSOFTWAREENVIRONMENTANDPRACTICALEXPERIMENTOFALARGESIZEJIGWITHDIMENSIONSOF5MX4MX3MISGIVENINAGENERICDESCRIPTIONTHISISREGARDLESSOFWHETHERTHEJIGISINFIRSTTIMEINSTALLATIONORITISACHANGEOFANEXISTINGJIGTOPOLOGYINTOANEWSHAPE,FORHOLDINGADIFFERENTCOMPONENTDEPENDINGONTHECOMPLEXITYATYPICALLARGESIZEJIGHASBETWEENTHREETOFIVELEVELSOFFRAMESAPARTFROMTHEBASELEVELWITHNORMALLYONEMAINFRAME,ATEACHLEVELTHERECANBEONEORSEVERALFRAMESTHESEFRAMESAREINTERRELATEDWITHREFERENCETOTHEJIGDATUMINORDERTOFACILITATETHEPOSITIONINGANDFUNCTIONALITYREQUIREDINANAUTOMATED,FIXEDPLATFORM,ROBOTICSYSTEMSCARRYOUTSEVERALTASKSSUCHASPARTPOSITIONING,MACHININGANDASSEMBLYTHEROBOTWORKINGDATUMTHEREFOREISLINKEDWITHTHEWORKINGFRAMEOFTHEJIGCAREFULCONSIDERATIONOFJIGDATUMINGSTRATEGYANDITSSUBSEQUENTINSTALLATIONCANSECUREACHIEVINGTHEDESIREDTOLERANCE31MEASUREMENTASSISTEDFLEXIBLEJIGINSTALLATIONTHEREARESEVERALSTAGESFORTHEINSTALLATIONOFFLEXIBLEJIGSTHATCANBECARRIEDOUTINFIRSTSIMULATIONANDTHENREALWORLDTHEUSEOFSIMULATIONEXERCISECANREDUCETHENUMBEROFPOTENTIALERRORSANDREWORKDURINGTHISPROCESSTHEPROCESSOFMEASUREMENTASSISTEDINSTALLATIONISSIMILARTOTRACKINGOBJECTSTOPOSITIONTHATISCOMMONFORLARGESIZEASSEMBLIESINTHISAPPROACHTHECOMPONENTSOFTHEJIGAREROUGHLYPOSITIONED,WITHIN1MMTOLERANCEFROMTHETARGETPOSITION,ATFIRSTTHENWHENALLOFTHEJIGCOMPONENTSAREATTACHEDINTOTHEIRDESIGNATEDPOSITIONS,WITHIN01MMTO015MMTOLERANCE,THEYARETIGHTENEDUSINGTHEAPPROPRIATETORQUETHETYPICALSTAGESOFMETROLOGYASSISTEDFLEXIBLEJIGINSTALLATIONAREGIVENBELOW1SETTINGINITIALREFERENCEFRAMESINTHEFACTORY2MEASUREMENTOFINITIALREFERENCEFRAME3INSTALLATIONOFBASEORMAINFRAMEINITSPOSITION4INSTALLATIONOFINNERFRAMESOFFLINE5INSTALLATIONOFHOLDINGANDPOSITIONINGBRACKETS6INSTALLATIONOFCLAMPS,BUSHINGSANDPICKUPSINTHEIRROUGHPOSITIONONINNERFRAMESANDMAINFRAME7INSTALLATIONOFINNERFRAMEONTHEBASEFRAME8FINEADJUSTMENTANDFASTENINGOFKEYLOCATINGCOMPONENTS9VERIFICATIONOFREFERENCEFRAMESANDCLAMPS10INSERVICEMONITORINGOFKEYPOSITIONSONTHEJIGTHESESTAGESARERELATEDTOTHECOMPLETEINSTALLATIONOFTHEJIGFROMTHESCRATCHNEEDLESSTOMENTIONTHATINCASEOFSLIGHTMETHODOLOGYFORHIGHACCURACYINSTALLATIONOFSUSTAINABLEJIGSANDFIXTURES153CHANGEINDESIGNVARIATIONSOMEOFTHEFOLLOWINGOPERATIONSWILLBEOMITTEDTABLE2ABRIEFCOMPARISONBETWEENDIFFERENTJIGPHILOSOPHIESTYPICALCHARACTERISTICFIXEDFRAMEFLEXIBLEJIGJIGLESSAPPLICATIONLARGEVOLUMEPRODUCTIONLOWVOLUMEPRODUCTIONPROTOTYPINGUNIQUENESSREPEATABLERECONFIGURABLECOSTEFFECTIVENESSDURABILITYVERYHIGHHIGHLOWPROSRIGIDITYVERYHIGHUNCERTAINTYRIGIDITYLOWWEIGHTHEAVYMEDIUMLOWPORTABILITYNONPORTABLEDIFFICULTCOMPONENTPOSITIONINGINEACHSETUPDIFFICULTTOPROGRAMCOSTVERYHIGHMEDIUMLOWCONSMANUFACTURINGTIMELONGMEDIUMSHORT32ALGORITHMFORFLEXIBLEJIGINSTALLATIONTHEINSTALLATIONPROCESSESFORFLEXIBLEJIGSTAKETHEFOLLOWINGMAINSTAGES1THEINSTALLATIONOFMAINFRAMEOFTHEJIG2THEASSEMBLYOFMOVINGUNITSANDSUBSYSTEMS3THEINSTALLATIONOFTHEJIGINNERFRAMESONTHEJIGASSEMBLY4THEASSEMBLYOFPICKUPSANDCLAMPSONTHEJIGTHEMAINFRAMEISTHEBACKBONEOFTHEJIGTHATISTYPICALLYFIXEDFORALARGENUMBEROFJIGTOPOLOGYANDDESIGNVARIATIONSTHEREFOREITDOESNOTCHANGEINSHAPEASREGULARLYASTHEINNERFRAMEORTHESMALLERELEMENTSOFTHEJIGSUCHASBUSHINGS,PICKUPSANDCLAMPSCAREFULCONSIDERATIONOFTHEMANUFACTURINGPROCESSCANREDUCETHENECESSITYOFREARRANGINGLARGERELEMENTSOFTHEJIGCOMPONENTSRESULTINGINFURTHERTIMEANDMONEYSAVINGFIGURE3INTHREESEPARATEGROUPSOFACTIVITIESSHOWSTHEPROCESSESOFFLEXIBLEJIGINSTALLATIONINTHISPROCESSITISASSUMEDTHATTHESTANDARDPARTSOFTHEJIGARESELECTEDFROMTHEAVAILABLE,OFFTHESHELFSECTIONSANDCOMPONENTSTHENINADVANCEOFTHEPHYSICALINSTALLATIONANUMBEROFTESTSANDTRIALSARECARRIEDOUTTOPLANTHEJIGINSTALLATIONINSUCHAWAYTHATTHEUNCERTAINTYOFMEASUREMENTISREDUCEDONCETHEACCEPTABLELEVELOFUNCERTAINTYISACHIEVEDTHEPHYSICALINSTALLATIONCANTAKEPLACEFIGURE3MEASUREMENTASSISTEDINSTALLATIONPROCEDUREFORFLEXIBLEJIGJJAMSHIDI,PGMAROPOULOS154INJIGINSTALLATIONPROCESSITMIGHTBEREQUIREDTOUSEMULTIPLEMEASUREMENTSYSTEMORAMEASUREMENTSYSTEMFROMSEVERALLOCATIONSTOCOVERTHECOMPLETESETOFKEYPOINTSFORJIGINSTALLATIONTHISSHOULDINCLUDETHEAUXILIARYTARGETREFERENCEPOINTSTHATAREPLACEDONTHEFACTORYFLOORANDWALLFORSTABILITYANDDRIFTCHECKDURINGTHEJIGSERVICEDURINGTHELOCALISATIONOFTHEKEYPOINTSONTHEJIGTHEUNCERTAINTYOFTHEMEASUREMENTINSTRUMENTSHOULDBETAKENINTOACCOUNTASARULEOFTHUMBTHEACCURACYOFTHEJIGPOSITIONINGFOREACHKEYLOCATIONSHOULDBEINANORDER10TIMESBETTERTHANTHEREQUIREDTOLERANCEINOTHERWORDIFTHETOLERANCEONTHECOMPONENTISSPECIFIEDAS01MMTHEACCURACYOFTHEJIGPOSITIONINGSHOULDBEATLEAST001MMTHEBESTPRACTICEAPPROACHESFORTHEFLEXIBLEJIGINSTALLATIONAREGIVENBELOW1APLANNEDPOSITIONFORTHEINITIALREFERENCEPOINTSONTHEFACTORYWALLANDFLOORISPREFERREDINORDERTOMINIMISEUNCERTAINTYOFTHEMEASUREMENT2THEINSTRUMENTPOSITIONSHOULDBEVERIFIEDONREGULARBASESUSINGTHEINITIALREFERENCEPOINTS3ONEACHLARGESECTIONOFTHEJIGSEVERALSMRNESTSCANBEATTACHEDFORBETTERTRACKINGANDREPEATABILITY4WHERETHELARGECOMPONENTSOFTHEJIGHAVEBENDORTWISTTHELEVELMEASUREMENTSHOULDBEFOCUSSEDONTHECENTRALSECTIONOFTHEBEAMSTOREDUCEANGULARPOSITIONINGERROR5THEREFERENCEPOINTSONTHEINNERFRAMESSHOULDBESELECTEDASDISTANTASPOSSIBLEFORCREATINGFRAMECOORDINATESYSTEMSTHISCANRESULTINSMALLERUNCERTAINTYWHENINTHEINNERFRAMECOORDINATESYSTEM4UNCERTAINTYUNCERTAINTYIFDEFINEDBYGUM8ASTHERESULTOFTHEEVALUATIONAIMEDATCHARACTERISINGTHERANGEWITHINWHICHTHETRUEVALUEOFAMEASUREDOBJECTISESTIMATEDTOLIE,GENERALLYWITHAGIVENCONFIDENCETHEUNCERTAINTYHEREISREVIEWEDFROMTWOASPECTS,THEFIRSTISRELATEDTOTHEMEASUREMENTPROCESSANDTHESECONDISRELATEDTOTHEUNCERTAINTYOFJIGPOSITIONINGMEASUREMENTUNCERTAINTYHASANUMBEROFCONTRIBUTINGFACTORSSUCHAS
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
- 2026中国叶黄素酯龙头企业战略动向与标杆案例解析报告
- 2026中国叶黄素酯行业供应链优化与风险管理研究报告
- 2026中国污水处理设备行业技术标准与出口潜力研究报告
- 2026中国游戏行业供需分析及新兴市场投资布局规划
- 2026人工智能客服系统情感识别研究企业服务更建议
- 2026中国咖啡连锁品牌三四线城市扩张战略与本土化调整
- 2026中国智能消防系统制造行业市场现状供需分析及投资评估规划分析研究报告
- 2026中国智能停车场管理系统行业市场需求产业链创新技术发展分析研究
- 2026代糖行业产能过剩风险与差异化竞争路径探讨
- 2026中国玩具行业市场竞争态势及未来市场发展趋势研究
- 2026年秋季开学小学防震减灾开学第一课
- 2026年继电保护专业岗位考核题库（附答案）
- （2026 秋季版）新人教 PEP 六年级上册英语单元词汇表（含音标 + 默写练习 + 参考答案）
- 2025国家能源集团招聘笔试历年参考题库附带答案详解
- 山东黄金焦家金矿安全生产管理制度汇编
- 消毒供应室追溯系统
- 人体生理功能PPT（高职护理）完整全套教学课件
- 04SG519-2 多高层建筑钢结构节点连接
- GB/T 22344-2008包装用聚酯捆扎带
- 幼儿园中班课件：《调皮的风》
- 吹灰器教学讲解课件-
评论
0/150
提交评论