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CH IN ESEJO U RN AL O FMEC HAN I C ALENGIN E ERF又G V o l . 18 , No . 4 , 2 0 05 . 60 9 . Yu T O ngmin LiGUanhUa D ESIGNTECHNOLOGYFOR INJECT10N MOLDRARTING SURFACE BASEDONCASES AND KNOWLEDGE LIYbUmin A bs t r act:on t h e basis oft heeo m P r e he nsiv e a n alysis a b out thea ut o m a tiegen er a t io n of t he i n j e et - La nJian Ke yLa冈r at or y f orP旧dsio n andNon - tr aditio nalMaehining飞ehnolo gyof Mini a tr y o f Educ aUon , D川讯nUni V e内t yofT eC hnolog叭 Dal ian11602 4 , Chi na lo n m o, d pa r t 、 甲 旦 犷 华 ce , t h e Pa r t i ngsu r f a ce 户 臀 即卿t h o d .w h i 三 h 卿 duce管 卿 oWle 瞥严d c 冬 se 万 ba sed r e aso nm g(CBR )mtot h ec om Puter -a laea de slg n 15 aescnD eo oyeomo lnm g w i t nt n cacu a, ehara eteristie inin je etio nm old de sign , a n dt h e d esig n Pro ee ssofease一basedreaso ning method 15 also given . A e ase l ibr ar y In eludin g t h eInto r m atlo norPar tlngsu r丈aee一5 ou一rw一 tn tne m ae xor m ainsha Pe f e at t甘es . T h e a u tomatiedesig n o ft h emo1d Pa r ti ngsurf a ce isr ea liz ede o m b i n ed wit ht h e f o r 胃a r d 一rea so nin gm et hod a n dt h e51而la r i t y 5 0】utionpr oe edu r e . T h e r ul e k n owle奴e librar y15 also imPr o ved . K eywords: I n j eetio n m old Pa I t ingsur i触 ce de signCase 一ba sed r e a soning (CB R) Simil葫t y solution 0IN T RODUCT IO N Being on eofthe im P or t a n tstePsinin je ction theehoie e ofPa r t ing su r f a ee has an dire etly ef f eet m old desig n , on t h e ge n er al f ra m e de si四 . m old ma kin Zeo st, t h ep叭in只su r f a e e m a ehining a n dthe q u allt yot tnetlnalPla snc Pa r t s 一 botn era tlo na l ehoosingof the Pa r ting surf aee 15 the Pre e o ndition ofa su e ee ssf ul in je etio n m ol d de sig n a nd the ba sis ofrealizing in je etio nm ol ding Pa r t a n toma tie andsoPhistieated design . In re eent yea r s,resea reh wor kon t h e Pa r ting su rf ae e a n dm old e om Ponents a u toma tie al ly ge n er a tio n15o n eofthehotsPots a nd dif f i e ultie s in the in je etio nm olding CA Df i eld , and m any rese afche rs a ro und t he wo rld ha vedo n eremar k a b lew o r k sabout 1FR AMEVVORKOFKN OWL E DGE A NDCASE - BASEDREASO NINGPA RTINGSUR FAC E AUT OMA TICD E SIGN t hisissu e . But tho sePrio rwor k ste ndtoe sha Pea nd it sPo sit io n rela t io nsofP毯r tings XPr CS u r f a c SS e onst r Uetingsome 。umer ic al m odels ba sed o n t h e geom et r y all一a rou n d by t h ee s se ntial a n alysisof t he PlastiePar t 5 sha pe st r uet u reeom Plexit y ofPlastic P出 kinds ofshor t c om ing sin Pra ctic e 2 一5. D u etothe div ersit y a nd ts . tho semethodsh8 V es ome Wit h m u ehexPer ien ee a ndlit tl e t h eo r yf o r m olding de sig n , t h e Pa r ting su r f a c e de sig nm ethod Whieh int r o d u e e s k n owledge andease一based r eas oning (CBR)i ntothe eo m P uter 一aided de sig n 15Pr ese ntedby eom biningw iththedesig n Pr o eessof in je etio n m olding de sig n , 5 0 t h atthe m olding Par t se a n beg e ne ra ted a u tomatie ally . K n owledgea ndca se 一ba sed re a so ning m e a n s 即Pl yi ng51而Iar i t yj ud g l n e ntPr oeed u r e a ndanalog ism toha ndle an ew de sig nt ask by e onstr ueting k n owledge librar y andea se librar y a ndre sPe ctiv erea soning r ul eon t h e basis of eom b t h e k n owle d g e 皿dr ul eof Par ting su r f a c e d e si郎 Su eeessf ul engln e er s Pr i neiPle sueees sf u l a Ppr o ac h de si即 份于 s忠“Pd t h 犷 su c c e, 铆) “x Penen c 乡 or ga n 1Ca lly 一, tnl ls m en ewQeSlg nn o to n ly 的d ofT f it s of m old Par ting su rf aee but als o in eludes t h e ex Per i eneeoftho s e f o n nere ase s A sa r e sult, t his 15m or ee onv e nient, quiek a nd Praetie al ef f eetiv e co m P a redtoan al ysis a n d solving t h e Pa r ting su r f a c e de signby co n st r Uetingnu merie al m o del . FU r t herm o rethe deseriPtio nof Pa r ting sur f aee desig n ex Perie n ee s a r ee asi lyex Pre ssed by t h e c asesra the rthantheabst raet designr ules a n d exPressio ns . 50 the k n owledgeandea se一ba sedre a s o ning Pa r t ing s u r f a e e d e sig n m et hod 15ver ysuita b lef o r m olde nginee r 5 tho ughtf ashio n and 1】18l lner . R eeeive d May26 , 200 4; re ceiv ed i n r e v ised f o r m A u g U st 17 , 2 00 5; a eeePt ed Augu st3 0 , 2 0 0 5 Theg e ner al idea of k n owledge a nd c a s e一basedreas oning Pa l ting su r f a ee desig n15t of o u ndae ase libra r y using s u cee s sf ul Par tlng su r f a C e desig n s in ter m of m o ldedPa r t s t y P es a nd g eometr ie c h a r aeter . T h e m ainsha Pe f ea奴i r es ofmol ded P斌 a re index e soft his l ib r a r y . Af ter sea r c h ing t h e sim ila r ea se wit ht h e Pa r t ,s m ainsha Pe f e atu re f r o mt h e e a se l i br ar y ,t h e Par ting s ur i臼e e c a n beg ener a ted byjudgi ng f r o mt h esim i la r it ypr in ei Ple a nd t h e given rea so ningst ra teg y . Att h esa me t i m e, the eo rr e la tive k n owle电e a nd PrineiPle s of Pa r ting s urf ae e desig n a n d the desig n er 5 ex Per ie n e es ea n be sunn n a r i zed into k n owledge li bra J了 , w h ieh ea n beque r i ed a n d co n sult ed by de sig n er sas t he a s sista nt inf o r m atio nofPa r t ing su到 臼e e desig n . T h eeaseeo m P o n e ntoft he m et hod 15 u sed f o rt he r e ason ing de sig n , w hilet h e k n ow led ge o n e f o rthe g u i dan ee ofde sig ner 5 r a t io n alsele et ionofPar t ing sur i臼c e , T h e k n owle d ge andcase一based r eas oningPa r ting su r f a e e de si助m ainlye onsists oft he f ollowing : Co n st r u eting k n owl- edge libr山下 . Ai而ng a tt h e Pr a c tic eofin je et io n m o ld ingd e sig n , a k n owledge libra r y of Par ting sur i 触e ede sig n r ules 1 5 f o un ded thro ug h eon eluding a nd integ ra tingt h e r elated 如owledg e a n d r ul e sof Pa r ting sU r f ae ede signa ndt h e desig n er s e xPer iene e s . Co nst r uet inge a se l ibrar y ofpa r t ingsu r f ac epo si tio n . A ea se library of Pa r t ing su rf aee Po sition 1 5eo n st r ueted ba s ed o n the t y P e sof mol ded Par t sand t he Pr e vi ou s s u c ee ss创 d e sig nea ses , wh i ehe onsists of t he de ser i Ptio n ofeases a nd thest r u et Ureofc ase l ibrar y , Thekey ofdese r i b in gt h e Po si t io n o f P叭ing s u rf a c e 1 5to sor t a n d or g a n izet h esha Pe f e at ure s ofcase m odels a n d de t e r n u ne the e or re sPo ndlng Po si t io nof P训ng s u r f a c e a c e ording to t h e va r i a n t sh即eof m olded Pa r t s . Beea u se t h e Pa r ting surf aee Po sition 1 5 ma i n l y deten ni n ed b y t h e Pa r t , 5sha Pe f ea l卫re , t h e or g a niza tio nofe a s e librar y sho uld beProPitio u s to t h eea se sea r c hi ng inde si助 n r o e e ss . xden tif i ea t io nof m olded par t s sha Pe f e at ure . The sha Pe f e at U re sofor i g in al Pa r t sho uld be ide ntif i ed be f o r e de t en 朴Ining t h e Positio n of Pa r t ing s u r f a e e . T h e r ef ore , t he m a in sha Pe f e at t甘es inde xn e edto bef o u nded aim ing a tt h e tyPe ofmolded Pa r t st r uet u re T h u s t h eseat n le ss j ointbet we e n m odeling m e ldedPa r t a ndd esig n m o d u le of m ol d P田七ng 孤f a c eoa n be rea l ized . A sar es u lt, t h e 访he r i ted cha racter istieofsystem 1 5 a l s o im P r o ved . Systemr e asoning a n d se arehing model . Sea r ehinga nd matehingthesim ila r shaPe . 6 10 . 迎些些些些i丝 卫旦丝 四t e ch nolo 即f o r i n j eetio n m oldpa r t 哪 surf ac eba sedo n C a seSa ndk n o wledge f o a t u r e of Par t m odelf rom thePar ting su r f a e e Po sition e ase s 15 thePr imar ytaskofthePa r ting su r f a ee Po sitio nea se ,5 searehing R ec om mende d st y l e Un ady一 sablest yle eou rs e . He n ee buil d ingthe sha Pe f eat u re inde x od m odel15 e o re to re alizeexa eteas e Autom atie g en eration re aso ning a n dquiek se a r c h t h e ing 、 of Pa r t ing su rf ae e . Af t e r Per f o r m ing de sign m a rehinga ndad justingaboutt heseleeted Pa r ting surf aee Po sitio n e ase whieh15 51 而la r to t h esha Pe f e a t u reof molded Par t , the n e ede d m old Par ting surf aeeea n beg ener ated au tomatie ally . sto rag eofe ase s . Tho ab un血nte ase l ibr娜 of Pa r ting s u rf ae e Po sitio n 15t h e imPor t ant f o u ndatio n t oimpr o ve the de sign qu alit y of m old Par ting s u rf a c e a nd reasoning ef f ieieney . The system Pro vide s storage j udgme nta ndsele etio n ba sed o nela ssif ieation by ease f e a t u re s a b ou t thef inal lyre sult ofea ehnew de sig n task . Thef loweha r t of k n owle d g e a n d ea se 一ba se dr ea s onin g P叭i ng surf ae e de sig ning 1 5show n inFig . 1 . 幕幕幕 Fig , 2 De m o n s t i习tion of t he k n owledg e librar y of Pa r t ing su r f ae ede sig n MMM odel吨pa r t f e目双佗s s s F F Fe atu r e lde nd 五c at io n n n MMMa加hi n g阮丘泊加几s s s i i i n d e xe d 昌盘s h a p e e e 卜卜卜卜卜卜卜卜卜卜卜md t h ec ase m od e l l l Ca s e l i b铆。f f f f f 51 功jl a rsimila r t o t h e e e pa r t ,性州破e e e e e por ts b叩e e e 1 1 1 p o . l一 on n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n D D D D D D D D D D D D D D D D D D D D De比r u u n e t heP叭i n g su r 血c e e e u u u s in g s im i l 耐t y5 0 1诵。 。 p p p似e d 址eb助碱o nt h e e e e e e口 日 七扣口。del l l 人人d dt ot h ec姆libm r y of f f p p p州如g ,世血ce p o si t i o n n n ThePar ting s u rf aee de sig nm ainly ha s relatio n tothemain shaPe f e at ureofmolded Par t , a n dtheidentif i ea t ion ofthe m ain sh叩e f e at Ur ealso Play s a le adjngr ole主 ne a s ese ar c hing , I刀山js rega r d , t h est r Ue t U r eofe a s e librar y sho u l dbe o rga niz ed ae eording to t h esha Pe f e a t u reof Pa r t , a n d the hie rarehie al f e at ure t ree ofmol ded Pa r t shoul d be e o n st r ueted , by whiehthe par t e as esean be elassif iedst ored . C lassif ying the shaPe f e at Ure sof Pa r ts byt h e irdif f e r e nteha ra eters, the e om mo n f a etorsofPar t m odele a n be ext raeteda sthe Pa r e ntn ode . The ehil dn odeea n inher it allofat t r i bute s 加m thePa rentn ode , and eont ain m or e f e at ur estl ia n t h e Par e ntone . As f a r asa sing lee ase 1 5e o n e er ned , alo ng wit h the in h e ritedre la tio n going thr oug h la y er bylayer ,t h e n um b erof f e a姗e a t t ribu te swill in er e ase T hef e at ureat trlbutes a r e m o reaPt to de se ribingeo n eretely a nd byin st a ne e , a nd t h ee o m P le x degr e eoftheirrelation s 1 5als o in e reased . This e la ssif i ed 叩Pro aehe a n helPto sea rehtheea se libr田了 inde xed byshaPe f e a加re sa ndtosolve t h e m oded P洲 withe omPlex s ha P e . 3 3 . 1 CASE D E SC R IPT IONS ANDSEA R CHING Ca sedes er iPt i on s 2BUI L D I NGOF KN OWL ED GELI B R A R Y A ND CAS E LIB R A RY The k n owledge libra r y15t heil n P or t a n t r e s o u rce t ha t e a n assist desig n e r to seleetra t io n alPar tin g su rf aee Po sit i o n . The or ganizatio nand de ser i Ptio n of如owle d geint h e librar y shoul d f it f o rthe Pr a etie al m o l dde sig nPr o e e ssande a n bee a sil y qu e r ie d a nde o n sulted byde sig n er s . The ref o re , t h ee om m onu sed k n owledgea nd Pr i neiPle s inPar ting su r f a ce de sig n a n d the de sig u e r s suee e s sf u le xPe r ie n e eswe reeo加lu ded a n din t eg rated . Som e Pie e e sof de sig n r ule sk n owle d g e , whiehf o r m the k n owled ge librar y of Pa r t ing su rf ae e de sig n , we r e e st abl ishe dand were identif i ed by sim P le se nten ee s . A l l of t he desig n r ul e s in libra r y we r ede ser i beda ndexPr e ssed indetailbyf ig ure a nd l et ter . A nd the elu e 1 5als o give nin “r e eo l刀n1 ended , a nd “no t re com m ended , waysin t h e f igu reeom P o n en tof de sig n r ul es, whiehe anhel Pthede sig n 明 m ake t her at i onals ele c七j o n b a se d o n Par tie ularde sig nea se . Fig , 2 showst he Pa r ting surf aee Po sition de se riPtio ngivenby thesystem af te r ehoo si ngon eofthe de sig n r ul e s T h eea se dese ri Ption15 the f o unda t io n to Per f o r m a k no w ledg e base d r ea s o n ing , whieht umst o de s er ibea ne xisted su cees sf u l desig n e a se a st h e d a t a inf o r m atio n t ha t ean be iden t if i ed a n dProc e sse d by eom P u te The e onte nta nd t h e d e ser i P tivewa y s ha v erelat ion wit ht hequ al it y a nd ef f ieie neyof solving51 而Ia r q ue stion s . T h eea se d e ser i Pt i o n ma ybe ex Pr es sed int h e f ol lowing m ode , e as eof t he m ol ded Par t = t h e i nde xinf o r m a t io n + Po sitio n inf o n刀a t ionofPa r t in g su r f ae e , whe re t h e ind e x inf o r m atio n 15the sha Pe f e at ureof t he Pa r t . N a m e l y t h esha Pe f e at oreofPa r tas a n index ea ns ea r c hthe sim ila re a s ewit h t he m a i n shaPe f e at u r e , a nd t h eresPe etive Pa r t ing surf ae e Po sitio n 15 als o g iv e n int his ease . Thu st h eea ses inPa r ting surf aee Positio ne as e librar y a r e s ome t y P ie al Pa r t s ha P e a n dt h eeor r esPo nding Pa r ti ng surf aee Po sitio n o n t h e Pa r t m o del . Th e n u m eriealdes eriP t io n 1 5 ea se( F 3 匀 =e ase(伪, 乃 , , 劫 , (s J, 勺 , , ) where F 二 伪 , 乃 , 二, 人) , 关1 5 t h eehil dshaPe f e at ure int h e in jeetion m o ld ing e a se , i= 1 , 2 , , n , n 1 5 t h enumbe r ofehild f e atu resi n t he e a s e , S = ( s一,5 2, , s。) , s j15t h esolvingsc heme , i . e . t h e Par ting su r f a ee Po sitio n . j = 1 , 2 , , m , 阴15t he n u m b erof a va i la b lePa r ting sur i触e e po sit ionofo n ee a se m o del Ah i e ra r c h ieal e a se libr卿 , whieh 15sho w n inFig 3 , ea n be f o r m eda ee ording t ot h enu m b e r ofthesha Pe f e a t u r e s in e a s es . Andt h en e x ta ye r eonta ln so ne m o resha Pe f e at Ure t h an the f o n朴ero n e . Itde veloPs t h esha Pe inf o r m a t io n ofea se m odelon t h e ba sis of inher iting t h e f o r m e r la y e r 5 sha Pe f e at ur es . Fig4 shows t h eor g a n izing sehemeofe o m P lex e a se s . The seheme 15 e o n sisten i with the m odel Proee ssof mol ded Pa r t , thusit15 c o n venien t to Per f o r m ing e asesea rehing inde xed bythe sh叩e f e at i jre . 3 . 2H ie r ar chicalse a r ehingba sed o nthe Pr odu et rule Cas e se 毗hi ng 1 5 a n im Por t a nte om Po n e nt inr e aso ning m eeha n ism . The e ss en i ialofsea r ehing 15the Proe e ss of se ar c hing a nd m a t ohing . 50t hePro e ess ofe o n st r ue亡 inginf e ren ee m eeha n - CHI N ESEJOURNALOFMECHANICA L ENG I NEERI NG . 611 . ism15 als o t h e Proc ess ofe on st Iueting t h e s ea r c hing st r a t e gie sa nd m a t c hi ng t h e s i而l如tie s . T h e s t ra t e gie sha v ea g t e a t ef f eet o n t h e r e aso ningef f icie ney a n dt h eresult . ThePu J甲o seoft hesear c hing oft he Par ting su r f a ce Po si t ionca seistosea r c ht h eca se w h ic hhas the sim ila rm a i nsha pe f e at ure witht h e Plastie m o del . Thu st h e m e t h od 15Pr oPo s ed o n t h e ba sis ofPr o du etr ule a ee or d ingtot h e o吧a n jzatio nalst r Uet Ure ofease l ibrar y , Theh i era rchie als ea rehing m ea ns t h att hec a se librar y15 sea r c hed intu川f r om t h e hea dla ye r t ot he en d i n t h e s ea r e h i ng Pr o e edu re , butwh i ehem bran chm en t woul d bef ollowe d sho ul d be j udg e d f r o mt h e Produ etr ule . Fig . 3 s廿习c奴i re oft he Par ti n og rga n lz atio n s廿习c奴i r su rf aee Posit io nea se ibrar y 助助m PI贻 atedc a义s s s Fig . 4o r ga niz atio n st r u ctu reoft h eeo m P l ic a te d ea se Fi g . 5 showsatyPeofladde r l派 m o l dedPa r t swit h t h e ladder holef e at Ure, wh i ehea n be obt a in ed 妙 Pe rf o r m ingBo olea n su b 加etio n bet w e en t w o ladde r shaf t f eat t i r es, a nd af i ll以edeorn e r a st h eas sista ntf eat ti re . T h e r ea s o nin gsea r e h in gPr o eess is , 份stly Pe rf o 蒯 ng t h e 五rstj ud g l n ent, iff e at u re 115t h e ladde r shaf t , t h e n t h eea se 1wit hlad de r shaf t 15 obt ain ed: t h en Per i七n nlng the se e o nd j udg r ne nt, i ft h e f e at Ure 2wit hlad d e rshaf t Pe rf o r ins Bo olea n su b t r a et ion w i t h e as e Z , a nd t h e Po sit ionofitseen t e rl ine 15a t t h e sa rne loe硕o nwit ht h ef onner o n e s, t h e n t h e la dd e rs h af t ea se wit h la dde rholef e at ti re 15 obt a in ed . App lyingt h is re a so山ng m e t h odea naeaui re hi比 ef f ieie nev . De ca uses ea rcningalongo neembran e力mentne edn ott rave rs eal l ofea sei n theli bra J下 . lft h e r e as o ni n gr ule s a n d e as e sa re m at ure, t h esim i la r ea se witht h esha Pef eat u reoft he m olded Pa r t ea n be q u l ek lyobtain ed byaPpl ying hie ra r eh i ealsea rehing m e t h od ba sed onthe Pr odu etr ule . Fur thenn o re , du ring t h e Pr oc e ss ofea s e 一a s ed Pa r ting sur i兔e e a u tomatie de sig n , t h ee a se m odeln eedn ot r e sem blet h e Pa r t m odelentirel y . I t o n l y ne eds t ha tt h eir m ain sha Pe f e at ure s a r e sim ila r a n d the pa r ting s u rf ae e Po sirio n s r e la tive to oneof 朋 n s ha P e f e ature sof t he t w o m o d els a r e s俪Ia r . T h e51而l丽t y s o lutio n m o delofPa r ti ng su r f a e e a u toma tie g e n er a t ing15Pr oPo sed he re . 4SIMIL A RIT YSOL UTION MODEL OF PARTINGSURFA C E ThePa r tings u r f a e eofaea se ha st h e sPe eialPosi t ionrela t io n r ela t i v e t o aeer tai n f e an理e , Andt h e se r ela tion sr e Pr e se ntalw a y s o n ac er t a in su rf ae e,aeer t a i nseet io no r Pa s singth roughae er t a in Poin t ofthe f e at t甘e e t e . T七esePositio n rel a t io n s ea n be exPressed a s a ZD ve ctof , t ha tis P = 叉伽 , n) whe re 尹L - 一SP eeialPo sit ion r ela tio n 无 一一一V eet or sym bo l 尸-一Poin i oft hef ea奴甘ewh jeh t he P日r ti ng stlrf ae e Pa s se s 月Nor malve eto rofPa r t in g sur i触e e I n ot herwords, t h e Pa r t ing sur i触ee is r印re se n t ed by anor r nal veet or月 a nd a s Pe eialPoi ntPofthe f e at ure . For e ac h Pa r ting s山悉沈eofaea se m o d e l , veet or X15 uneba n gea ble . As f a r a s a boa r d l i ke Pa r t ca se m o del15 eo ne eme d , if t h e Par ting surf aee 15 de t er n nnedon t h etoPf aee, t he nPoi n tP15t h e ee n terPointoft h is 加c e , a nd 碑 15t h eno nna lveeto r .