机械类外文翻译-基于事例推理的夹具设计研究与应用

1竵文翻译基于事例推理的夹具设计研究与应用摘要根据基于事例的设计方法,提出采用工序件的特征信息和夹具的结构特征信息来描述夹具的相似性,并建立了包括这2方面主要特征信息为基础的事例索引码,设计了事例库的结构形式,创建了层次化的事例组织方式同时,提出了基于知识引导的夹具事例检索算法,以及事例的修改和采用同族事例码进行相似事例的存贮,形成了基于事例推理的夹具设计所开发的原型系统在型号工程夹具设计等项目的设计过程中得到了应用,并取得了令人满意的使用效果关键词基于事例的推理夹具设计CAD夹具是以确定工件安全定位准确为目的的装置，并在加工过程中保持工件与刀具或机床的位置一致不变。因为夹具的结构依G17194于G1147G2709的特G9869和在G1237G1006G16280G2022中加工工序的G3332位,所以G4439的设计是G2058G17908过程中的G10954G20060,G2058G13434G11540效G10587的提G20652夹具设计是一G1022G3809G7446的过程,G19668要G7389G1186G3835G18339的设计G16782G7003中了G16311G17148G18339知识的G13475G20576，这G1135设计G16782G7003包括工件的结构设计G451G9053及加工工G14414，和加工G10627G3671。G5415用这G1135G6809G19283G13484G2058G16826G13466设计G3282的G1268统的CAD工具G708G3926UNIGRAPHICSG451CATIAG451PRO/E时,这G1185G9994是一项G19762G5132G13803时的工G1328，G1306是G2045用以G5460的设计G13475G20576和G17176G9316G1075不G14033提G1391一G1135G11422G3800,G13792这G8503是提G20652效G10587的G1863G19202因G13044基于事例推理CBR的方法G17878应以G5460G1022G7708G16311G1927的G2162法,建立一G1022G7044G19394G20076的方法,主要G7389以G991G3247G8505G20600检索G451G2045用G451修改,并保G11053这是一G1022G8616用G999G1006系统G8181G1235人G12879G5617G13512G7389用的使用方法，因为提出一G1022G12879似的G5785G1929,和采用一G1135修改,似G1058不G16340G14270G7138,G13792G1000G8616人G12879G7368G11464G16278所以G6915持不同事例的设计工具G5062G13475在G16844G3822G20058G3507中发G4649G17227来，G3926在G8892G4568成型及设计G451建G12581设计G451G8181具设计G6249G8527,G16280G2022过程中,G17836G7389夹具设计G4397用G1857G1022G6980G4395组成G1207码G2454G6980,包括工件的形G10378G451机G7812G18108G2010G451G17736G15936,G12544一定位装置,G12544G1120定位装置和夹G13051装置G1306这G1022系统不G14033用于除钻床夹具外的其他夹具G12879型,不G14033G16311G1927储存G19668要保G11053的同一G2454G6980G1207码的G19394G20076,这在CBR中是G19762G5132重要的1事例G2454G6980和事例G3282书馆的建立11事例G2454G6980事例G2454G6980应该由工件的所G7389的特征组成，来区别不同的夹具使用他们G14033够使操G1328方便因为零件的形G10378是G3822种G3822样的,在生G1147G1237G1006中G2058G17908的技术要求G1075不断发G4649,许G3822特征G1328被用做事例G2454G6980将会使搜索速度降低,其主要特征是不2重要的,因为G2010配给每G1022特征的G8616重必须减少另一方面,事例G2454G6980包含所G7389的特征是困难的。因此,考虑到实际和快速设计的G19668求,事例G2454G6980要包含工件的主要特征和夹具的结构。事例G2454G6980G1207码由16位G6980组成13位G6980是事例特征3位G6980是事例识别G6980G4395。前13位G6980G1207表13G1022特征。每G1022G6980G4395与特征的一G1022属性相一致,这可G14033是“G451“G451“1“G451“2“，“A“G451“B“,，“Z“，等其中的一G1022。其中，“是指任何一G1022,“G1207表不确定,“0“G1207表没G7389。系统G16280定夹具的G12879型，工件的形G10378，位置G8181式不G14033是“和“。在设计系统时,三G1022项目的属性信息没G7389这G1135选择,这就意味G11540必须选择确定的属性。最后三位G6980是事例识别号码,G3926果事例特征的13位G6980是一样的,这三G1022G6980G4395就用来区别他们。该系统G17836G16280定“000“是用于修G8503的一G1022典型事例,其他事例“001“G451“002“G451,这G1135是用于设计师查找G2454考事例的G3926果其中一G1022偶尔G19668要改变成典型事例,首先G4439必须要求改成“000“,前面的G14270动变成G2454考事例事例索引码的结构G3926G32821所示。1夹具G12879型；6工件重G18339；11夹G13051G8181型；2工件形G10378；7工件刚度；12夹具体；3工件材料；8加工内容；13其他；4批G18339；9过程所G7389物；14到16事例识别码；5工件G8616例；10定位G8181型；G32821事例索引码的结构12事例库事例库由许G3822预定义的事例组成。事例的描述是基于事例推理的最重要的G19394G20076之一。所以由索引码G3809合。13事例的层次化夹具的结构相似被认为是整G1022夹具，成G2010和内容相似。所以，整G1022夹具事例库，成G2010事例库，夹具的成G2010事例库形成相同。整G1022夹具的设计G17176料通G5132是由工件G17176料和工件加工G17176料组成,这就意味G11540夹具的设计应满足特别功G14033的G19668求全G18108夹具事例是由功G14033成G2010组成，G4439是用功G14033成G2010的名G4395和G6980G4395来进行描述3的。成G2010事例G1207表成员G708成G2010功G14033和其他结构成G2010，主要驱动G2454G6980，G6980G4395，和G4439们的G13434束G1863系）。成G2010事例G708夹具的最低层）是功G14033成G2010和和其他成G2010的结构。在现G1207夹具设计中G7389很G3822G2454G6980化准件和普通G19762标准件。所以成G2010事例G3282书馆应记录特殊G2454G6980和保持G4439们的方法。2事例修改的策略在基于事例的夹具设计中，最重要的是相似G9869的修改，这样G14033G7389助于获得最相似的事例，以及缩短G17878应时间。根据夹具设计的G19668求，事例修改的策略使最接近的事例方法和知识指导结合G17227来。首先在深度上查找，G9994后在宽度上；知识指导策略意味G11540在来G14270客G16278事物根G9316的知识G16280则上查找，这就要首先查找固定G12879型，G9994后查找工件的形G10378，G12544三查找定位方法。例G3926，G3926果事例索引码包括夹具G12879型的磨削夹具，就G2494查找所G7389的磨削夹具，G9994后查找工件形G10378的G11430G4388，G12544三查找一G1022G5191面G1016G1022G19156的定位方法。G3926果没G7389合G17878的，就查找深度标G9869，G9994后G3250到最上层，G9994后G1889找所G7389与宽度相G1863的事例。修改方法G20）根据夹具事例库的事例索引信息，查找G7389G1863事例库。G21）将事例索引码与事例库的每G1022事例码G2317配，G9994后计算相似G4622G4556的G1227G1552。G22）整理相似G4622G4556的次序，最G3835的G7562G4388是最G12879似的事例。G1016G1022事例之间的相似G9869是基于G1016G1022事例特征之间的相似G9869。相似G9869G4622G4556的计算依G19764特征的G12879型。相似G9869的G1227G1552可以通过G6980G4395化的G1227G1552来计算，例G3926G8616G17751重G18339G2010别是50KG和20KG的工件。G19762G6980G4395化的G1227G1552G1075G14033计算，例G3926，现在前13位索引码G18129是G19762G6980G4395化的G1227G1552。一G1022夹具的相似G4622G4556的计算G1856式G3926G991其中S表示通用夹具的相似G4622G4556，N表示索引特性G6980，表示每G1022特性的重G18339，表示事例库中特性和相G1863夹具的特性的相似G4622G4556。同时，G6980G1552计算G3926G9914其中表示G12544IG1022特征的索引特性G1552，表示事例库中G12544JG1022事例的G12544IG1022特征的特性G1552。所以G7389G1016种方法选择相似夹具。一G1022方法是建立G6980G1552。G3926果通用事例的相似G4622G4556G1552G8616给定的G6980G1552G4579，这G1135事例就不G14033选来G1328相似事例。事例库最G2033建立的时G1517，G2494G7389一G1135事例，G6980G1552可以建G4579一G9869。G3926果G7389G3835G18339的相似事例，G6980G1552就应该建的G3835一G1135。另外一G1022方法是G2494建立相似事例的G6980G4395G708例G392610），这是G12879型G2345G18336相似G4622G4556的最G3835G1552。3事例的修改和存储31事例的修改夹具设计中相似事例的修改包括以G991三G1022G19466G85851）成G2010的G7379G12072）保持形式不变，G16855整成G2010的特性3）G8181型重G7044设计G3926果夹具的成G2010是普通的物G2709，G4439们G14033通过使用工具被修改，G1207G7379以及G2036除，这G1135G5062G13475被设计G3921了。32事例的存储在将一G1022G7044的事例保存到事例库之前，设计G13785必须考虑保存是G2554G7389G1227G1552。G3926果这G1022事例不G14033G3698加系统的知识，就没G7389必要G6238G4439保存到事例库G18336。G3926果G4439G7389G1227G1552的G16817，设计G13785在保存之前必须G2010G7524一G991，G11487G11487这G1022事例是G2554G1328为标准事例或G2454考事例被存储了。一G1022标准事例是一G1022描述同族事例主要特征的标准。一G1022同族事例是G7389事例库中索引码前13位相同G13792最后三位不同的G18039G1135事例组成的。一G1022标准事例的最后三位通G5132是G256000G257。一G1022G2454考事例属于同族标准事例，5最后三位用不同G6980G4395区G2010。G1186被G16311G18334的G8022G5577中，可采用以G991方法1）G3926果一G1022G7044的事例和任何一G1022存在的事例族一致，和一G1022存在的标准事例的前13位G6980相同，G18039G1052这G1022事例就不G14033存储因为G5062G13475这种标准事例了。或G13785G2494G14033G1328为一G1022G2454考事例保存G708最后三位不是G256000G257，G13792G1000和其G4439的不一样）在事例库中。2）G3926果一G1022G7044的事例和任何一G1022存在的事例族一致，并G1000被认为G1207G7379这G1022事例族要G8616以前的标准事例G3921，G18039G1052这G1022标准事例就被这G1022G7044的事例G1207G7379，以前的标准事例G1328为一G1022G2454考事例保存。3）G3926果一G1022G7044的事例和任何一G1022存在的事例族不一致，一G1022G7044的事例族将会G14270动G1147生，并G1328为标准事例保存到事例库中。4夹具设计中基于事例推理的过程根据夹具设计的特性，夹具设计的基G7424信息，例G3926夹具的名G4395，零件，生G1147和设计G13785等等，必须先G17767G1849。G9994后，G17767G1849或设计工件的G8181型。G17767G1849G7389G1863工件的G13466G14422信息，建立事例索引码，G9994后CBR开G3999依G19764相似G4622G4556查找相似事例，选出最相似的事例。G3926果G19668要的G16817，事例要满足通用性设计，G1889存储到事例库中。程序G8981程G3282G3926G32822所示G32822基于事例推理的夹具设计G8981程G328265基于事例推理的夹具设计G16840G7138这是一G1022工件G3926G32823所示。材料是45G19062，G5225G5243，形G10378为G3371G10378，生G1147批G18339为中批等。G19668要设计成一G1022用来G7071G17728G4392的G7071G17728夹具。G32823G19668要设计夹具的一G1022工件G708最G3835G4622G455680MMX49MMX22MM）工件的特征G1552，属性G1552，事例索引码和重G18339在表1中G2027出。表1工件的事例索引码和重G18339特征名G12228特性G1552索引码重G18339夹具G12879型G17722床夹具1100工件形G10378G3371G10378990工件材料中G11911G19062370批G18339中批260工件G8616例G4579560工件重G18339G17743560工件刚度G11840度G5390160加工内容G4392380程序要求G4448成加工370定位方法三G1022G5191面1100夹G13051方法不确定90夹具体G3809合480其他没G73890607通过查找和计算相似G9869，最相似的事例的事例索引码是19325513321402000，G13466G14422信息在表2中G2027出。表2最相似事例的事例索引码特征名G12228特性G1552索引码夹具G12879型G17722床夹具1工件形G10378G3371G103789工件材料中G11911G190623批G18339中批2工件G8616例G45795工件重G18339G177435工件刚度G11840度G53901加工内容G43923程序要求G4448成加工3定位方法三G1022G5191面1夹G13051方法不确定夹具体G3809合4其他没G73890相似G9869的计算G3926G991所以夹具的相似G4622G4556G1552是0806，这是在事例库中用于设计的最相似的事例，最相似的事例的结构G3926G32824所示8G32824最相似的夹具G5415成G2010G7379G1207，修改定位G8181型和夹G13051G8181型，以及G16855G14422相G1863G4622G4556之后，G7044的夹具被设计出来，G3282形G3926G32826所示G32825G19668要设计的G7044夹具因为在事例库中没G7389相似夹具，G7044夹具被储存到事例库中。事例索引码是19325523311402000。6结G16782基于事例推理，G1328为一G1022G19394G20076G16311G1927的方法，是一G1022G8616G8181G1235人G12879G5617G5831的G999G1006系统G7368G7389效的方法，G5062G13475在很G3822难获取知识的G20058G3507G18336得到发G4649。基于事例推理的G1260G9869G3926G991G4439和人G12879的G5617G5831很相似；一G1022事例库通过保存G7044事例获得G14270G4410G14033G2159，G4439G8616G7389G5827例库G7368快G7368容G7143，G4439可以G7368G3921的G1268G17894和G16311G18334G7044的知识，这和G5827例库G73899很G3835的不同。基于事例推理中提出的一G1022夹具设计的G7706G7562G5062G13475被实行了，使用的是G6915持基础G6980据的VC，UGG11017G14053G13484G3282G17731件。这G1022G7706G7562G1075G5062G13475和普通成G2010库和典型夹具库结合G17227来。这G1022发G4649的标准系统，用于G14334G12366项目，G5122助夹具设计G13785提G20652设计效G10587和重G7044使用先前的设计G17176G9316。10附录2英文原文APPLICATIONANDDEVELOPMENTOFCASEBASEDREASONINGINFIXTUREDESIGNABSTRACTBASEDONTHECASEBASEDDESIGNINGCBDMETHODOLOGY,THEFIXTURESIMILARITYISINTWORESPECTSTHEFUNCTIONANDTHESTRUCTUREINFORMATIONTHEN,THECOMPUTERAIDEDFIXTUREDESIGNSYSTEMISCREATEDONCASEBASEDREASONINGCBR,INWHICHTHEATTRIBUTESOFTHEMAINFEATURESOFWORKPIECEANDSTRUCTUREOFFIXTUREASCASEINDEXCODEAREDESIGNEDFORTHERETRIEVEOFTHESIMILARCASES,ANDTHESTRUCTUREANDHIERARCHICALRELATIONOFCASELIBRARYARESETUPFORSTOREMEANWHILE,THEALGORITHMBASEDONTHEKNOWLEDGEGUIDEDINTHERETRIEVEOFTHESIMILARCASES,THESTRATEGYOFCASEADAPTATIONANDCASESTORAGEINWHICHTHECASEIDENTIFCATIONNUMBERISUSEDTODISTINGUISHFROMSIMILARCASESAREPRESENTEDTHEAPPLICATIONOFTHESYSTEMINSOMEPROJECTSIMPROVESTHEDESIGNEFFICIENCYANDGETSAGOODRESULTKEYWORDSCASEBASEDREASONINGFIXTUREDESIGNCOMPUTERAIDEDDESIGNCADFIXTURESAREDEVICESTHATSERVEASTHEPURPOSEOFHOLDINGTHEWORKPIECESECURELYANDACCURATELY,ANDMAINTAININGACONSISTENTRELATIONSHIPWITHRESPECTTOTHETOOLSWHILEMACHININGBECAUSETHEFIXTURESTRUCTUREDEPENDSONTHEFEATUREOFTHEPRODUCTANDTHESTATUSOFTHEPROCESSPLANNINGINTHEENTERPRISE,ITSDESIGNISTHEBOTTLENECKDURINGMANUFACTURING,WHICHRESTRAINSTOIMPROVETHEEFFICIENCYANDLEADTIMEANDFIXTUREDESIGNISACOMPLICATEDPROCESS,BASEDONEXPERIENCETHAT11NEEDSCOMPREHENSIVEQUALITATIVEKNOWLEDGEABOUTANUMBEROFDESIGNISSUESINCLUDINGWORKPIECECONFIGURATION,MANUFACTURINGPROCESSESINVOLVED,ANDMACHININGENVIRONMENTTHISISALSOAVERYTIMECONSUMINGWORKWHENUSINGTRADITIONALCADTOOLSSUCHASUNIGRAPHICS,CATIAORPRO/E,WHICHAREGOODATPERFORMINGDETAILEDDESIGNTASKS,BUTPROVIDEFEWBENEFITSFORTAKINGADVANTAGEOFTHEPREVIOUSDESIGNEXPERIENCEANDRESOURCES,WHICHAREPRECISELYTHEKEYFACTORSINIMPROVINGTHEEFFICIENCYTHEMETHODOLOGYOFCASEBASEDREASONINGCBRADAPTSTHESOLUTIONOFAPREVIOUSLYSOLVEDCASETOBUILDASOLUTIONFORANEWPROBLEMWITHTHEFOLLOWINGFOURSTEPSRETRIEVE,REUSE,REVISE,ANDRETAIN1THISISAMOREUSEFULMETHODTHANTHEUSEOFANEXPERTSYSTEMTOSIMULATEHUMANTHOUGHTBECAUSEPROPOSINGASIMILARCASEANDAPPLYINGAFEWMODIFICATIONSSEEMSTOBESELFEXPLANATORYANDMOREINTUITIVETOHUMANSSOVARIOUSCASEBASEDDESIGNSUPPORTTOOLSHAVEBEENDEVELOPEDFORNUMEROUSAREAS24,SUCHASININJECTIONMOLDINGANDDESIGN,ARCHITECTURALDESIGN,DIECASTINGDIEDESIGN,PROCESSPLANNING,ANDALSOINFIXTUREDESIGNSUNUSEDSIXDIGITALSTOCOMPOSETHEINDEXCODETHATINCLUDEDWORKPIECESHAPE,MACHINEPORTION,BUSHING,THE1STLOCATINGDEVICE,THE2NDLOCATINGDEVICEANDCLAMPINGDEVICE5BUTTHESYSTEMCANNOTBEUSEDFOROTHERFIXTURETYPESEXCEPTFORDRILLFIXTURES,ANDCANNOTSOLVETHEPROBLEMOFSTORAGEOFTHESAMEINDEXCODETHATNEEDSTOBERETAINED,WHICHISVERYIMPORTANTINCBR61CONSTRUCTIONOFACASEINDEXANDCASELIBRARY11CASEINDEXTHECASEINDEXSHOULDBECOMPOSEDOFALLFEATURESOFTHEWORKPIECE,WHICH12AREDISTINGUISHEDFROMDIFFERENTFIXTURESUSINGALLOFTHEMWOULDMAKETHEOPERATIONINCONVENIENTBECAUSETHEFORMSOFTHEPARTSAREDIVERSE,ANDTHETECHNOLOGYREQUIREMENTSOFMANUFACTUREINTHEENTERPRISEALSODEVELOPCONTINUOUSLY,LOTSOFFEATURESUSEDASTHECASEINDEXWILLMAKETHESEARCHRATESLOW,ANDTHEMAINFEATUREUNIMPORTANT,FORTHEREASONTHATTHERELATIVEWEIGHTWHICHISALLOTTEDTOEVERYFEATUREMUSTDIMINISHANDONTHEOTHERHAND,ITISHARDTOINCLUDEALLTHEFEATURESINTHECASEINDEXTHEREFORE,CONSIDERINGTHEPRACTICALITYANDTHEDEMANDOFRAPIDDESIGN,THECASEINDEXINCLUDESBOTHTHEMAJORFEATUREOFTHEWORKPIECEANDTHESTRUCTUREOFFIXTURETHECASEINDEXCODEISMADEUPOF16DIGITS13DIGITSFORCASEFEATURESAND3DIGITSFORCASEIDENTIFICATIONNUMBERTHEFIRST13DIGITSREPRESENT13FEATURESEACHDIGITISCORRESPONDINGTOANATTRIBUTEOFTHEFEATURE,WHICHMAYBEONEOFG256G257,G256G257,G2561G257,G2562G257,G256AG257,G256BG257,G256ZG257,ETCINWHICH,G256G257MEANSANYONE,G256G257UNCERTAIN,G2560G257NOTHINGTHESYSTEMRULESFIXTURETYPE,WORKPIECESHAPE,LOCATINGMODELCANNOTBEG256G257ORG256G257WHENTHESYSTEMISDESIGNED,THEATTRIBUTEINFORMATIONOFTHETHREEITEMSDOESNOTHAVETHESEOPTIONS,WHICHMEANSTHECERTAINATTRIBUTEMUSTBESELECTEDTHELASTTHREEDIGITSARETHECASEIDENTIFICATIONNUMBER,WHICHMEANSTHE13DIGITSOFTHECASEFEATUREARETHESAME,ANDTHENUMBEROFTHESETHREEDIGITSISUSEDFORDISTINGUISHINGTHEMTHESYSTEMALSORULESG256000G257ISAPROTOTYPECASE,WHICHISUSEDFORRETRIEVAL,13ANDOTHERCASESAREG256001G257,G256002G257,WHICHAREUSEDFORREFERENCECASESTOBESEARCHEDBYDESIGNERSIFOCCASIONALLYONEOFTHEMNEEDSTOBECHANGEDASTHEPROTOTYPECASE,FIRSTITMUSTBEREQUIREDTOAPPLYTOCHANGETHEONETOG256000G257,ANDTHEFORMERISCHANGEDTOREFERENTIALCASEAUTOMATICALLYTHECONSTRUCTIONOFTHECASEINDEXCODEISSHOWNINFIG112CASELIBRARYTHECASELIBRARYCONSISTSOFLOTSOFPREDEFINEDCASESCASEREPRESENTATIONISONEOFTHEMOSTIMPORTANTISSUESINCASEBASEDREASONINGSOCOMPOUNDINGWITHTHEINDEXCODE,13HIERARCHICALFORMOFCASETHESTRUCTURESIMILARITYOFTHEFIXTUREISREPRESENTEDASTHEWHOLEFIXTURESIMILARITY,COMPONENTSSIMILARITYANDCOMPONENTSIMILARITYSOTHEWHOLEFIXTURECASELIBRARY,COMPONENTSCASELIBRARY,COMPONENTCASELIBRARYOFFIXTUREAREFORMEDCORRESPONDINGLYUSUALLYDESIGNINFORMATIONOFTHEWHOLEFIXTUREISCOMPOSEDOFWORKPIECEINFORMATIONANDWORKPIECEPROCEDUREINFORMATION,WHICHREPRESENTTHEFIXTURESATISFYINGTHESPECIFICALLYDESIGNINGFUNCTIONDEMANDTHEWHOLEFIXTURECASEISMADEUPOFFUNCTIONCOMPONENTS,WHICHAREDESCRIBEDBYTHEFUNCTION14COMPONENTSNAMESANDNUMBERSTHECOMPONENTSCASEREPRESENTSTHEMEMBERSFUNCTIONCOMPONENTANDOTHERSTRUCTURECOMPONENTS，MAINDRIVENPARAMETER,THENUMBER,ANDTHEIRCONSTRAINRELATIONSTHECOMPONENTCASETHELOWESTLAYEROFTHEFIXTUREISTHESTRUCTUREOFFUNCTIONCOMPONENTANDOTHERCOMPONENTSINTHEMODERNFIXTUREDESIGNTHEREARELOTSOFPARAMETRICSTANDARDPARTSANDCOMMONNONSTANDARDPARTSSOTHECOMPONENTCASELIBRARYSHOULDRECORDTHESPECIFICATIONPARAMETERANDTHEWAYINWHICHITKEEPSTHEM2STRATEGYOFCASERETRIEVALINTHECASEBASEDDESIGNOFFIXTURES,THEMOSTIMPORTANTTHINGISTHERETRIEVALOFTHESIMILARITY,WHICHCANHELPTOOBTAINTHEMOSTSIMILARCASE,ANDTOCUTDOWNTHETIMEOFADAPTATIONACCORDINGTOTHEREQUIREMENTOFFIXTUREDESIGN,THESTRATEGYOFCASERETRIEVALCOMBINESTHEWAYOFTHENEARESTNEIGHBORANDKNOWLEDGEGUIDEDTHATIS,FIRSTSEARCHONDEPTH,THENONBREADTHTHEKNOWLEDGEGUIDEDSTRATEGYMEANSTOSEARCHONTHEKNOWLEDGERULEFROMROOTTOTHEOBJECT,WHICHISFIRSTLYSEARCHEDBYTHEFIXTURETYPE,THENBYTHESHAPEOFTHEWORKPIECE,THIRDLYBYTHELOCATINGMETHODFOREXAMPLE,IFTHECASEINDEXCODEINCLUDESTHEMILLINGFIXTUREOFFIXTURETYPE,THESEARCHISJUSTFORALLMILLINGFIXTURES,THENFORBOXOFWORKPIECESHAPE,THETHIRDFOR1PLANE2PINEOFLOCATINGMETHODIFTHEREISNOMATCHOFIT,THENTHESEARCHSTOPSONDEPTH,ANDRETURNSTOTHEUPPERLAYER,ANDRETRIEVESALLTHERELATIVECASESONBREADTHRETRIEVALALGORITHMS1ACCORDINGTOTHECASEINDEXINFORMATIONOFFIXTURECASELIBRARY,SEARCHTHERELEVANTCASELIBRARY152MATCHTHECASEINDEXCODEWITHTHECODEOFEACHCASEOFTHECASELIBRARY,ANDCALCULATETHEVALUEOFTHESIMILARITYMEASURE3SORTTHEORDEROFSIMILARITYMEASURE,THEBIGGESTVALUE,WHICHISTHEMOSTANALOGICALCASESIMILARITYBETWEENTWOCASESISBASEDONTHESIMILARITYBETWEENTHETWOCASESFEATURESTHECALCULATIONOFSIMILARITYMEASUREDEPENDSONTHETYPEOFTHEFEATURETHEVALUEOFSIMILARITYCANBECALCULATEDFORNUMERICALVALUES,FOREXAMPLE,COMPAREWORKPIECEWITHTHEWEIGHTOF50KGAND20KGTHEVALUECANALSOBECALCULATEDBETWEENNONNUMERICALVALUES,FOREXAMPLE,NOWTHEFIRST13DIGITSINDEXCODEISALLNONNUMERICALVALUESTHESIMILARITYMEASUREOFAFIXTUREISCALCULATEDASFOLLOWSWHERESISTHESIMILARITYMEASUREOFCURRENTFIXTURE,NISTHENUMBEROFTHEINDEXFEATURE,ISTHEWEIGHTOFEACHFEATURE,ISTHESIMILARITYMEASUREOFTHEATTRIBUTEOFTHEI2THFEATUREWITHTHEATTRIBUTEOFRELATIVEFEATUREOFTHEJTHCASEINTHECASELIBRARYATTHESAMETIME,THEVALUECOUNTSASFOLLOWS16WHEREISTHEVALUEOFTHEINDEXATTRIBUTEOFTHEITHFEATURE,ANDISTHEVALUEOFATTRIBUTEOFTHERELATIVEITHFEATUREOFTHEJTHCASEINCASELIBRARYSOTHEREARETWOMETHODSTOSELECTTHEANALOGICALFIXTUREONEISTOSETTHEVALUEIFTHEVALUESOFSIMILARITYMEASUREOFCURRENTCASESWERELESSTHANAGIVENVALUE,THOSECASESWOULDNOTBESELECTEDASANALOGICALCASESWHENTHECASELIBRARYISINITIALLYSETUP,ANDTHEREAREONLYAFEWCASES,THEVALUECANBESETSMALLERIFTHEREARELOTSOFANALOGICALCASES,THEVALUESHOULDGETLARGERTHEOTHERISJUSTTOSETTHENUMBEROFTHEANALOGICALCASESSUCHAS10,WHICHISTHELARGESTVALUEOFSIMILARITYMEASUREFROMTHESORTEDORDER3CASEADAPTATIONANDCASESTORAGE31CASEADAPTATIONTHEMODIFICATIONOFTHEANALOGICALCASEINTHEFIXTUREDESIGNINCLUDESTHEFOLLOWINGTHREECASES1THESUBSTITUTIONOFCOMPONENTSANDTHECOMPONENT2ADJUSTINGTHEDIMENSIONOFCOMPONENTSANDTHECOMPONENTWHILETHEFORM17REMAINS3THEREDESIGNOFTHEMODELIFTHECOMPONENTSANDCOMPONENTOFTHEFIXTUREARECOMMONOBJECTS,THEYCANBEEDITED,SUBSTITUTEDANDDELETEDWITHTOOLS,WHICHHAVEBEENDESIGNED32CASESTORAGEBEFORESAVINGANEWFIXTURECASEINTHECASELIBRARY,THEDESIGNERMUSTCONSIDERWHETHERTHESAVINGISVALUABLEIFTHECASEDOESNOTINCREASETHEKNOWLEDGEOFTHESYSTEM,ITISNOTNECESSARYTOSTOREITINTHECASELIBRARYIFITISVALUABLE,THENTHEDESIGNERMUSTANALYZEITBEFORESAVINGITTOSEEWHETHERTHECASEISSTOREDASAPROTOTYPECASEORASREFERENCECASEAPROTOTYPECASEISAREPRESENTATIONTHATCANDESCRIBETHEMAINFEATURESOFACASEFAMILYACASEFAMILYCONSISTSOFTHOSECASESWHOSEINDEXCODESHAVETHESAMEFIRST13DIGITSANDDIFFERENTLASTTHREEDIGITSINTHECASELIBRARYTHELASTTHREEDIGITSOFAPROTOTYPECASEAREALWAYSG256000G257AREFERENCECASEBELONGSTOTHESAMEFAMILYASTHEPROTOTYPECASEANDISDISTINGUISHEDBYTHEDIFFERENTLASTTHREEDIGITSFROMTHECONCEPTTHATHASBEENEXPLAINED,THEFOLLOWINGSTRATEGIESAREADOPTED1IFANEWCASEMATCHESANYEXISTINGCASEFAMILY,ITHASTHESAMEFIRST13DIGITSASANEXISTINGPROTOTYPECASE,SOTHECASEISNOTSAVEDBECAUSEITISREPRESENTEDWELLBYTHEPROTOTYPECASEORISJUSTSAVEDASAREFERENCECASETHELAST3DIGITSARENOTG256000G257,ANDNOTTHESAMEWITHOTHERSINTHECASELIBRARY2IFANEWCASEMATCHESANYEXISTINGCASEFAMILYANDISTHOUGHTTOBEBETTERATREPRESENTINGTHISCASEFAMILYTHANTHEPREVIOUSPROTOTYPECASE,THENTHEPROTOTYPE18CASEISSUBSTITUTEDBYTHISNEWCASE,ANDTHEPREVIOUSPROTOTYPECASEISSAVEDASAREFERENCECASE3IFANEWCASEDOESNOTMATCHANYEXISTINGCASEFAMILY,ANEWCASEFAMILYWILLBEGENERATEDAUTOMATICALLYANDTHECASEISSTOREDASTHEPROTOTYPECASEINTHECASELIBRARY4PROCESSOFCBRINFIXTUREDESIGNACCORDINGTOTHECHARACTERISTICSOFFIXTUREDESIGN,THEBASICINFORMATIONOFTHEFIXTUREDESIGNSUCHASTHENAMEOFFIXTURE,PART,PRODUCTANDTHEDESIGNER,ETCMUSTBEINPUTFIRSTTHENTHEFIXTUREFILEISSETUPAUTOMATICALLY,INWHICHALLCOMPONENTSOFTHEFIXTUREAREPUTTOGETHERTHENTHEMODELOFTHEWORKPIECEISINPUTORDESIGNEDTHEDETAILEDINFORMATIONABOUTTHEWORKPIECEISINPUT,THECASEINDEXCODEISSETUP,ANDTHENTHECBRBEGINSTOSEAR