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CH IN ESE JOU R N A L OF MECH A N ICA L EN G IN E ER FGVo l. 18, N o . 4 , 2 0 05. 60 9 .Yu TO ng m inLiG Ua n hUaDESIG N TECHNOLOGY FORINJECT10 N MOLD RARTINGSUR FACE BASED ON CASESAND KNOW LEDG ELIYbUm inAb str a c t: o n the basis o f th e e o mP re hen siv e an alysis ab o u t the a u to m at ie g e n erat io n o f th e inj e et-La n Jia nKey Lara to ry fo r Pd sio n a nd No n -tra ditio na lMa ehin in gfehno log yofMin iat ry of Ed u ca Uo n ,D+n Un iV e=ty ofTe Ch no lo gDa lian 116024 , Chinalon m o , d partmaJc e, th e Parti n g surfac emath o d. whihad u ce5ao W led cseba sed re aso n m g (CB R) m to th e c o m P ter- al ae a d e slgn 15 a esc n D eo oy e o m o ln m g wi tn tn c a c ua ,e hara eteris tie in inje e tio n m o ld de sig n , an d th e d esign Pro e e ss o f e aseBba se d rea so n in g m e tho d 15a lso g iv en . A e a se libr ary In e lu d ing th e In to rm atlo n o r Pa rt ln g surjae eB5 o uBr wBtn tn e m a e x o rm ain shaP e fe ates. Th eau to m a tie d e sign o fth e m o 1d Part in g su rfa ce is re al iz ed e o mb in e d w ith th efo rar dBreas o n in g m eth o d an d th e 517lari ty 5 0u tio n p ro e edure . Th e ru le kn o w lele libra ry 15 a lsoim Pro v e d .K ey w o rd s: Inj e etion m o ld PaInt in g su ri(c e de sig n Ca seBba sed re a so n in g (C B R )Sim ilty so lu tio n0 INT R O D U CT IO NB ein g o n e o f the imP o rt an t stePs in inj e c tio nthe e ho ie e o fPart in g sur fa e e has a n dire e tly efe etm o ld d esign ,o n th e g e n era lfr am e de si. m o ld m ak in Z e o st, th e pinsur fa e e m a ehin in gan d th e qu a llty o t tne tln a l Pla sn c Part smBmcb o tn e rat lon a leho o sin g o f the Part in g s u rfa ee 15 the Pr e e o n ditio n o f asu e e e ssfu l inj e e tio n m o ld d e sign an d the b a sis o f re a liz in ginj e e tio n m o ld in g Part an to m at ie a n d s o Phistiea ted d esig n . Inre e en t year s, re sear eh w o rk o n th e Part in g su rfa e e an d m o lde omP o n en ts au to m at ie ally ge n erat io n 15 o n e o fthe ho tsPo ts a n ddifi e u ltie s in the inj e etio n m o ldin g CA D fi eld , an d m an yrese a fc he rs a ro u nd th e w o rld ha v e d o n e rem ark ab le w o rk s ab o u t1 FR A ME V V OR K O F K NO W L E D G E AND CA SE -B A SED R E A SO NIN G PA R T IN G SU R FA CEA U T O M AT IC D E SIG Nth is iss u e . B u t tho se Prio r w o rk s te n d to eshaP e a n d its Po siti o n relati o n s o f Prt in g sX Pr CSur facS Se o n strU etin g so m ebum eri c al m o d els b a s e d o nth e g e o m etryallBar o un d byth e e s se n tialan alysis o f th e Plas tie Pa rtn5 shap estru etur e e o m Ple x ity o fPla stic Pkin d s o f s ho rt c o m in g s in Prac tic ec2B5. D u e to the d iv e rsity a n dt s . tho se m e th o d s h8V e s o m eW ith mu eh ex Pe ri en e e an d lit le th e o ry fo r m o ldin g de sig n ,th e Part in g su rfa c e d e sign m e tho d W hieh in tro du e e s kn o w led g ea n d e a seBba sed re as o n in g (CB R ) in to the e o mP u terBaided de sign15 Pr e se n ted by eo m bin in g w ith th e de sig n Pro e e ss o f inj e etio nm o ldin g d e sign , 5 0 th a t the m o ld in g Pa rt s e a n b e g e n e r at edau to m a tie ally. Kn o w ledg e a n d c a seBba sed re a s o n in g m e a n sPlyin g 517Iari ty judgln e n t Pr o eedure a n d an alo g ism to ha n d lea n ew de sign ta sk by e o n stru etin g kn o w ledg e libr ary an d eas elibra ry a n d re sPe c tiv e re a so n in g ru le o n th e ba sis o f e o m bth e kn o w led g ed ru le o f Pa rt in g sur fac e de siSu e e e ssfu len gln e ersPri n eiPlesu ee e s sfu laP pro achd e sizsoPd thsu c c e ,)oxP e n en cTo rg a n 1Ca llymB, tn l s m e n e w Q e S lgn n o t o n lydo f Tfi tso f m o ld Pa rt in g s u rfa e e bu t a ls o in elu d e s th eex Peri en e e o f tho s e fo n n e r e a s e s A s a re su lt, th is15 m o re e o n v e n ien t, qu iek a n d Pra e tie al efe etiv eco mP a red to a n alysis an d so lv in g th e Part in g sur fac e d e sign b yc o n strU etin g num erie a l mo d el. FUrnt he r m o re the de ser iPtio n o fPart in g surfa e e d esign ex Per ie n e e s ar e e a sily exP re s se d b y th ec ase s rat he r tha n the ab str a et d esign ru le s an d ex Pre ssio n s . 5 0the kn o w led ge a n d ea s eBb a sed re a s o n in g Part in g sur fa e e de signm eth o d 15 very su itab le fo r m o ld e n gin ee rn5 thou ght fa shio n a n d118l n e r.R eee ived M ay 26 , 200 4 ; rec eiv ed in rev ised fo rm A u gU st 17 , 2 0 0 5; a eeePte dA u g u st 3 0 , 2 0 0 5Th e g e n e ra l ide a o f kn o w le d g e an d c a s eBba sed re a s o n in gPalt in g sur fa ee d e sign 15 to fo u n d a e a se library u s in g su c e e s sfu lPart ln g sur faC e d es ign s in term o f mo ld e d Part sntyP e s an dg eo m e tri e ch ar a e ter. Th e m ain shaP e fe alir es o f m o ld ed Pa rein de x e s o f th is libr ary . A ft e r sear ch in g the sim ilar eas e w ith th ePart , s m ain shaP e fe a tu re fro m th e e a se libra ry, th e Pa rt in g s u rie ec a n b e g e n erat ed by jud gin g fro m th e sim ilari ty p ri n eiPle an d th eg iv en reas o n in g str at egy . A t th e sam e ti m e , th e eo rre lat iv ekn o w lee an d Pr in eiPle s o f Part in g s u rfa e e d esign an d thede sign ern5 exP eri e n e es ean be su n n n ari z ed in to kn o w ledge libraJ,wh ieh ean b e qu eri ed an d c o n su lte d by de sign ers a s th e a s sistan tin fo rm atio n o f Part in g sue e d esign . Th e ea se eo mP o n e n t o fth em e th o d 15 u sed fo r th e re a so n in g de sign , w hile th e kn o w led ge o n efo r the gu id an e e o fd e sign e rn5 rat io n a ls e le eti o n o fPart in g s u ric e ,Th e kn o w led ge a n d c a seBb a sed re a s o n in g Part in g sur fa e ed e sim a in ly e o n sis ts o f th e fo llo w in g : Co n stru e tin g kn owl-e dg e libr/. A i7n g at th e Prac tice o finjee ti o n mo ldin g de sign , akn o wle dge library of Part in g suri(e e de sign ru les 15 fo und e dthro ugh e o n e lu ding an d integr at ing th e re latedo wledge an dru le s of Part in g sUr fae e de sign an d th e de sign e rsne xPe ri en e es . Co n stru eti n g e ase library o f parti ng sur fac e po sitio n . A e aselibr ary o f Parnt in g su rfa e e Po sitio n 15 e on stru e te d base d o n thetyPe s o f m o ld e d Part s and th e Pre vio u s suc e e ss7de sign e as e s ,w hi eh e on sists o fth e de seriP tion of e ase s an d the stru e tU re o fcaselibrary , The ke y o fdeserib ing th e Position of Ping sur fac e 15 toso rt an d org an iz e th e shaP e fe atu re s o fcase m ode ls an d det ernu n ethe e or e sPon dlng Po sit on o f Pn g sur fac e ac e o rdin g to th evari ant she of m olde d Part s . Beeau se th e Part ing surfa e ePo sitio n 15 m ai n ly de te n n in e d by th e Part , 5 shaP e fe alr e , th eorg an izat ion o f e ase library should be ProPitiou s to th e e asese ar ch in g in de sinro e e ss . xde nt ifi eat io n of m olde d partnsshaPe fe atu re . The shaPe fe atUr e s o f ori gin al Part sho u ld beide ntifi e d be for e det e nIn ing th e Po sition o f Part ing sur fa e e .Th er efo re , the ma in shaP e fe ate s in de x n e e d to be fo u ndedaimi n g at th e tyPe o f m o ld e d Part stru etur e Th u s th e se atnl e ssjo in t betw ee n m odelin g me lde d Part an d design mo du le of m o ldPBn gfac e oan be reali z e d . A s a resul t, th eheri tedchar acteri stie o f syste m 15 al so im Pro ve d . System re aso nin gan d se ar ehing m odel. Sear ehing and m ate hin g the sim ilar shaPe. 6 10 .ttttite chn o lofo r inj ee tio n m o ld partsu rfa ce b as e d on C a seS an d kn o w le dg efo atu re o f Pa rt m o de lfr o m the Part in g sur fa e e Po sitio n e a se s 15the Pri m ary ta sk o fthe Part in g sur fa e e Po sitio n e a se , 5 se arehin gR ec o m m e nded sty le U n ad yBsable sty lee o u rs e . He n ee b uild in g the shaP e fe atu r e in dex od m o d el 15e o re to re aliz e e x a e t ea s e Au to m atie g en e ratio nre ason in g an d qu ie k searc hth ein gao f Part ing su rfa e e . Afte r Perfo rm ingde sign m are hing an d adjustin g abou t th e sele e te d Part ing surfa e ePo sition e ase whie h 15 517lar to th e shaPe fe atu re o f m oldedPart , the n e e ded m o ld Part ing su rfa e e e an be g en era te daut o m atie ally. sto rag e of e ase s . Tho abu nnt e ase libr+o fPart ing surfae e Po sition 15 th e im Port an t fo u n datio n to im pro vethe de sig n quality of m o ld Part in g sur fac e an d re a so n in gefi eie n e y. The system Provide s storag e ju dg m e nt an d se le etionbase d on e lassifi e ation by e ase fe atu re s ab o ut the fi n ally re su ltof e aeh n e w de sign ta sk.The flo we hart o f kn o wledg e an d eas eBba sed re as on ingPin g surfae e design ing 15 shown in Fig. 1.Fig,2 D e mo ns titio n o fth e kn o wle dge libra ryo fPart in g sur fae e de signModelpart fesFea tur e lde ndcationMaFhin gmF+sind ex edshap em d th e c ase m o de lCas e li bbf 51jlar sim ilar to th epart ,e po rt sbe1 po . lmBon D e1run e the Pin g surceusi ng simil0ty 50 1bbpede baon th eeghgbdeld to th e cmlibm ry ofpg ,Wce po sit onThe Part ing surfae e de sign m ain ly has relatio n to the m ainshaPe fe atu re o fm o lde d Part , an d the iden tifi e at io n of the m a inshe fe a tU re also Plays a lea djn g ro len e ase sea rc hin g , Ijsre gar d , th e strU etUr e of e ase library shou ld be org aniz e dae e ording to th e shaPe fe atu re of Part , an d the hie rarehie alfe atu re tr e e of m o lded Part sho u ld be e on stru e te d , by w hie h thepart e ase s ean be e la ssifi e d sto re d . C lassifying the shaPefe atU re s o f Part s by th e ir dife re nt ehar ae ter s, the e o m m onfa eto rs o f Part m o de l ean be e x tr ae te d as the Par e nt n o de . Thee hild n ode e an in heri t allo fatri bute sFm the Pare n t n o de , an deo n tain m o re fe atu re s tlian th e Pa re n t o n e . As far as a sin gle e ase15 e on e ern ed , alon g w ith the inh e rite d re lat io n go in g thro ughlay e r by laye r, th e nu mb e r o f fe ae at ribut e s w ill in ere aseThe fe atu r e at rlbu te s ar e mo re aPt to de se ribing e on e re te ly an dby in sta n e e , an d th e e omPle x de gre e o f the ir r e latio n s 15 alsoin e re a se d . This e lassifi e dPro ae h e an he lP to se are h the e aselibrBin de x e d by shaPe fe aFre s an d to so lv e th e m ode d Pw ith e om Ple x sh aP e .33. 1CASE D E SC RI PT ION S AN D SEA R CH IN GCa se de se ri Pti o n s2 B UILDING OF KNOWLED GE LIBR AR Y ANDCA SE LIBR AR YThe kn o wle dg e library 15 the ilnP ort ant re source th at eanassist de sign er to sele et rat ion al Part ing su rfae e Po siti on . Theo rg an iz ation and de se ri Ptio n o fo wled ge in th e library shou ld fi tfo r the Pra e tie almo ld de sign Pro e e ss a nd ean be easily qu eri edand eo n sulted by de sign e rs. The refo re , th e e o m m o n u se dkn o wle dg e and Pri n eiPle s in Part ing sur fa ce de sig n an d thede sigu ersnsu e e essfu le xPer ien e e s w e re e oFlud ed an d int egr ated .Som e Pie e e s of de sign ru le s kn ow ledg e , whie h fo rm thekn o wledge library o fPart in g su rfae e de sign , wer e stablished a ndwe re iden tifi e d by simP le se nte n ee s . A ll o f th e de sign ru le s inlibrary w ere de se ri be d an d e xPre ssed in de tailby fi g ure an d le t e r.A nd the e lue 15 also g ive n inore e oln 1e ndedn, an donotre co m m e n de d ,nw ays in th e fi gu re e omPon e nt of de sign ru le s,whie h e an he lPthe de signm ake the ra ti o n alse lecjon ba sed onPart ie u lar design e ase .Fig , 2 show s th e Part in g surfae e Po sitio n de se riPtion g iv e n bythe system aft e r e ho osing o n e ofthe de sig n ru le scTh e e as e de se riPtion 15 the fo u ndat io n to Perfo rm akn ow le dg e base d reas on ing , w hieh tu m s to de se ri be an e xiste dsuc e e ssful de sign e ase as th e dat a in fo rm ation th at e an beidenti fi e d an d Pro ce ssed by eo m Pu teThe e o nte nt an d th ede se ri Pt ive w ay s hav e relati o n w ith th e quality an d efi e ien ey o fsolvin g 517Iar qu e stion s .Th e eas e de seri Pti on m ay be exPre sse d in th e fo llo w ing m ode ,ease of th e m o lded Part = th e in de x in fo rm at ion + Po sitio ninfo nati on ofPart ing sur fa e e , w he re the inde x in fo rm atio n 15 theshaP e fe atu re of th e Part . Nam e ly th e shaPe fe ato re of Part as anindex ean searc h the sim ilar e ase w ith th e ma in shaPe fe atu re , an dth e resPe e tive Parnt ing su rfa e e Po sitio n 15 also g iv e n in th is ea se .Thus th e eas e s in Part ing su rfa e e Po sitio n e ase library are som etyP ie alPart sh aPe an d th e e ore sPo nding Part in g su rfa e e Positio no n th e Part mo del. The num erie alde seriPt io n 15e as e(F3= e ase(,.,l, (sJ,l,m)whe re F=,.,=,),115 th e e hild shaPe fe atu re in th einje e tion mo lding e ase , i = 1, 2,l, n , n 15 th e n u mbe r o f ehildfe atur e s in the ease , S = (sB, 5 2,l, sb), sj 15 th e so lv ing sch e m e , i. e .th e Part in g sur fa e e Position . j= 1, 2,l, m ,|15 th e n umb e r o favai lab le Part ing su ri(ee po siti on o fon e e ase mo de lcA hi erar ch ie al e ase libra, w hieh 15 shown in Fig 3, ean befo rm e d ae e ordin g to th e n umb e r o f the shaPe fe atu re s in e ases .An d th e n ex t ay er e on tal n s o n e m ore shaP e fe atU re th an thefo ne r o n e . It de ve loPs th e shaPe info rm at ion of e ase m odel o nth e basis of inhe ri ting th e fo rm e r laye rn5 shaPe fe a tu re s . Fig 4show s th e org an izin g sehem e o f e omPlex e ase s . The se hem e 15e on sisteni w ith the m o del Pro ee ss o f m olde d Part , thu s it 15c o n v e nient to Perfo rm ing e ase se ar e hin g inde x e d by the shefe atij re.3. 2 Hie rarchicalse arehin g ba sed o n the Pro d u e t ru leCase sehing 15 an im Po rta n t e omP o n e n t in re aso ningm e e han ism . The e sse ni ialo fsear e hin g 15 the Proe e ss of se arc hin gan d ma to hin g . 50 the Pro ee ss o f e on stru eing infe re n e e m e e han -CHIN E SE JOUR N A L OF M ECHA NICAL E NG IN EER IN G . 6 11 .ism 15 a ls o th e Pro c e ss o f e o n stI u e tin g th e s earc hin g str ate gie s an dm atc hin g the si7ltie s . Th e str ate gies hav e a gte at efe e t on there aso n in g efi c ien ey an d th e resu lt. The PuJJo se o f th e s earc hin go fth e Part in g sur fa ce Po siti o n ca s e is to searc h th e c as e wh ich ha sthe sim ilar m ai n shap e fe atu re w ith th e Plastie mo d el. Thu s th eme th o d 15 Pro Po sed o n th e b a sis o fPro d u et ru le a e eo rd in g to th eoan jz atio n al strU etU re o f e a se library , The hi era r chie a l s ear e hin gm ean s th a t th e c a s e library 15 searc hed in tu+fr o m th e head lay erto th e end in the s eare hi n g Pro e edu re , b u t w hi eh e m br an c hm entw o u ld b e fo llo w ed sho u ld b e jud ge d fro m th e Pro du et ru le .Fig . 3 sclir e o fth e Pa rt ino grgan lz atio nlmsur fa ee Positi o n eas e ibra rym PI/a ted c alsFig.4 o rg an iz atio n stru c tur e o fthe eo mP licat ed eas eFig . 5 sho w s a tyPe o flad de r lmo ld ed Part s w ith th e ladd e rho le fe atU re , w hi eh ean b e o btai n edPe rfo rm in g B o o leansubFetio n b etw e en tw o ladd e r shaft fe at ir es , an d a fi lled eo rn e ras th e as sistan t fe a t ir e . Th e r ea s o n ing seare hi ng Pro e ess is,zs tlyPe rfon g th erstju dgln en t, iffe atur e 1 15 th e la dde r shaft , th e nth e e a se 1 w ith lad de r shaft 15 o bta in ed : th en Perin n ln g these e o n d ju dgrn e n t, if th e fe atU re 2 w ith lad e r shaft Pe rfo ri n sB o o lean sub tra eti o n w ith e a s e Z , an d th e Po siti o n o fits eent er lin e15 at the sa rn e lo eo n w ith th e fo n n e r one s , th en th e lad d er sh afteas e w ith lad d e r ho le fe a tir e 15 o bta in ed.A p plyin g th is re a son g m eth o d ean a eau ire hi1efi eie n ev.D e cau se s ea rc n in g a lo n g o n e em b ran em en t n e ed n o t tr a v e rse a llo f eas e in the lib raJ/. lf th e re as o n in g ru le s an d e a ses ar e m atu re ,th e sim ilar eas e w ith th e shaP e fe atur e o fth e m o lded Part ean bequl ek ly o btain ed by aPp lyin g hie rare hi e a l sear ehin g m eth o d ba s e do nthe Pro du e tru le . Fu rt he n n o re , d ur in g the Pro ce ss o f easeBas edPart ing su rite e au to m atie de sign , th e e a s e m o d el n eed n o tre s em b le th e Parnt m o d el en tir ely . It on ly n e eds th at th eir m ainshaP e fe atu re s are sim ilar an d the part in g s u r fa e e Po sirio n sre lat iv e to o n e o fn sh aP e fe atu re s o f th e tw o m o de ls aresIar. Th e 5 17lty so lu tio n mo delo fPart in g sur fa e e au to m at ieg e n erat in g 15 Pr o Po sed her e .4 SIMIL A R IT Y SO L U T IO N MOD E L O FPAR TIN G SUR FACET he Part in g su rfa ee o f a eas e has th e sPe eialPo siti o n relat io nre lati v e to a e ert ain fe a ne , A n d th e se re lat io ns re Pre se n t a lw ay son a c ernta in sur fa ee , a eert ai n s eeti o n o r Pas sin g thr o u gh a e erta inPo int o fthe fe a te et e . Tese Po sitio n relat io n s ean be e x Pressedas a ZD v ecto f, th at isP =, n )w he reL- BSPe eialPo siti o n re lat io nBBBVe eto r sym bo lC-BPo ini o fth e fe ale w hj eh th e Prt in g stlrfa e e Pas sesiN orm alve etor o fPart ing su ri(eeIn o th er w o rd s, th e Parnt in g su ri(e e is rre sent ed by a n o rn a lv eeto ran d a sPeeial Po in t P o f the fe atu re . Fo r each Part in gs+e o f a eas e mo de l, veeto r X 15 u n eban geab le