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
- 管理咨询售后服务方案
- 以前的活动策划方案怎么做
- 四个暖心活动方案策划
- 农产品加工产业链信息化-洞察及研究
- 海洋油气平台无人机巡检-洞察及研究
- VR技术在婴幼儿早期教育中的推广策略-洞察及研究
- 云南安全员证题库及答案解析
- 山东省中医护理笔试题库及答案解析
- 咖啡文创活动设计方案策划
- 西安基金从业考试培训班及答案解析
- 律师调查报告委托合同9篇
- 2026年高考作文备考训练之“自我接纳-自我认知-自我超越”作文讲评
- 2025年河北石家庄交通投资发展集团有限责任公司公开招聘操作类工作人员336人考试参考题库及答案解析
- 幼儿园大班数学《小熊种玉米》课件
- 公交车广告承包合同5篇
- 2025年秋新北师大版数学3年级上册全册同步教案
- GB/T 13460-2016再生橡胶通用规范
- 基础观感验收自评报告
- 班级管理(第3版)教学课件汇总全套电子教案(完整版)
- 公路桥梁工程施工安全专项风险评估报告
- T∕ACSC 02-2022 中医医院建筑设计规范
评论
0/150
提交评论