Masinyaniseke, xa abantu abaninzi besiva 'i-wax metal casting', baba nomfanekiso wegcisa elilodwa liqingqa ngocoselelo umfanekiso oqingqwe ngomthi weenyosi phambi kokuba unyamalale kumsi ukuze uthatyathelw' indawo yintsimbi emenyezelayo. Lo mfanekiso wothando uyingxenye yebali, kodwa inyaniso yezoshishino-into esiyibizayo utyalo mali-I-gritty, ichanekile, kwaye ihlala iphazamisa i-ballet ye-chemistry, i-thermodynamics, kunye nomonde. Eyona ngcamango iphosakeleyo? Ukuba yinkqubo elula, enenyathelo elinye 'elahlekileyo' inkqubo. Ayiyo. Litsheyini, kwaye lonke ikhonkco, ukusuka kwipatheni ye-wax yokuqala ukuya kwi-shakeout yokugqibela, yindawo enokubakho yokusilela. Ndibone ukujulwa okuninzi kukhutshiwe kwiqamza lomoya elincinane elivaleleke kwiqokobhe leceramic kunaso nasiphi na isiphene sesinyithi. Kulapho umsebenzi wenene usenzeka khona.
I-Wax sisiqalo nje
Wonke umntu ucinga nge-wax, kwaye ngokuqinisekileyo, ibalulekile. Kodwa uhlobo lwewax? Ayingobugcisa bokukrola umthwebeba. Sisebenzisa iiwax ezenziwe ngobunjineli benaliti, imixube eyenzelwe amaxabiso athile okuncipha, umxholo womlotha, kunye nokuqina. Kwindawo efana neQingdao Qiangsenyuan Technology Co., Ltd. (QSY), kunye namashumi eminyaka kumdlalo, baya kuba nethala leencwadi lewax kwimisebenzi eyahlukeneyo. Isibiyeli esinodonga olucekethekileyo lwe-aerospace sifuna uphawu lokuqukuqela olwahlukileyo kunomzimba wevalvu eqinileyo. Ukufumana iiparamitha zenaliti engalunganga apha-iqondo lokushisa, uxinzelelo, ixesha lokujikeleza-lithetha ukuba iphethini igqwetha kamva. Kwaye ukuphazamiseka kwinqanaba le-wax liphindaphinda kwinxalenye yokugqibela yentsimbi. Ndafunda ukuba indlela enzima kwangethuba, ukuvelisa ibhetshi yezikhenkce zegiya ezazingaphandle ngokumangalisayo; Wayilandelela emva kwiwax ephola ngokucothayo kwidayiri.
Udibaniso lwepateni, okanye 'umthi', bobunye ubugcisa obungaphantsi. Ayikokuncamathisela nje iinxalenye ze-wax kwi-sprue. Uyila inkqubo yokutyisa isinyithi esinyibilikisiweyo. Indlela olungelelanisa ngayo iindawo, ububanzi beembaleki, ukubekwa kwamasango—konke oku kuyalela ukuqina. Ukungangeni kakuhle kukhokelela kwimingxuma ecuthekayo, iziphene zangaphakathi ezinokuvela kuphela kwiX-reyi. Ndikhumbula iprojekthi yempompo yempompo kwi-duplex steel stainless apho sasihlala sifumana i-porosity kwi-hub. Sayila ngokutsha umthi we-wax, songeza amatshaneli amancinci, ekujoliswe kuwo, kwaye yacinywa kanye. Zezi zinto zilungiswayo, ezalwe ngokusilela, ezahlula ivenkile yomsebenzi kwingcali.
Emva koko kuza idyasi yokuqala, idiphu yokuqala ye-ceramic. Le asiyonto nje ingaqhelekanga. I-slurry, umxube womgubo we-silica ocolekileyo kunye ne-binder, kufuneka imanzise i-wax ngokugqibeleleyo ukuze ubambe zonke iinkcukacha. Nasiphina isiqwenga esincinci esiludaka aluncamatheli ekubeni sibe 'zimaphiko' okanye iqhuma ekujuleni. I-stucco, okanye isanti e-refractory, isetyenziswe ngokukhawuleza emva koko. Ubungakanani begrit yale dyasi yokuqala yeyona igqwesileyo-yinto ekunika ukugqitywa komphezulu. Ndichithe iiyure ngemakroskopu ndithelekisa umgubo we-zircon vs. Isilica edityanisiweyo yaloo dyasi yokuqala kwinxalenye efuna iRa 3.2 microinch finish. Ukhetho lubalulekile.
Isakhiwo seShell: Uvavanyo lomonde
Ukwakha iqokobhe lugqatso lomgama omde, hayi ukubaleka. Ufaka idyasi emva kwedyasi, utshintshana phakathi kwe-slurry kunye ne-stucco eqhubekayo erhabaxa (njenge-aluminosilicate), uvumela umaleko ngamnye wome ngokupheleleyo kwindawo elawulwayo. Ukufuma lutshaba apha. Ukufuma okuphezulu kunciphisa ukomisa, okukhokelela kubuthathaka beqokobhe. Ngokukhawuleza kakhulu, kwaye ufumana iintanda. Sijonge i-7 ukuya kwi-9 yemigangatho eqhelekileyo, kodwa kwi-castcast yentsimbi enkulu, ingaba yi-12 okanye ngaphezulu. Umaleko ngamnye wongeza ubukhulu kunye namandla okumelana noxinzelelo lwe-ferrostatic lwentsimbi etyhidiweyo. Ndikhe ndanokrwece oonokrwece—ukuqhekeka okuyintlekele ngexesha lokugalelwa—kuba sasiwuleqa umjikelo wokomisa ngemini efumileyo yasehlotyeni. Isifundo esinexabiso elikhulu ekuhlonipheni inkqubo.
I-Dewaxing kulapho igama elithi 'i-wax elahlekileyo' livela khona, kwaye sisigaba sobundlobongela. Asiyinyibiliki iwax ngobunono. Indlela eqhelekileyo i-autoclave dewaxing: igobolondo ixhomekeke kwi-high-pressure steam, etshisa ngokukhawuleza i-wax, ibangela ukuba yandise kwaye iphume. Ukuba iqokobhe alomile ngokupheleleyo, uxinzelelo lomphunga lunokulivuthela ngaphandle ngaphakathi. Kungenjalo, ukuthotywa komlilo olenyazayo—ukuphosa iqokobhe kwiziko elishushu—kuyakhawuleza kodwa kunomngcipheko wokothuka wobushushu. Injongo kukushiya indawo egqibeleleyo, ecocekileyo ye-ceramic cavity. Naluphi na uthuthu lwewax olushiyekileyo lungonakalisa umphezulu wesinyithi kamva.
Emva kokuba i-dewaxing, iqokobhe lifakwa kwiziko elinobushushu obuphezulu, ngokufuthi malunga ne-1000°C. Oku kwenza izinto ezimbini: itshisa naziphi na iitrayiti zokugqibela ze-wax okanye i-binder, kwaye itshiza amasuntswana e-ceramic kunye, idala ukungunda okuqinileyo, okuvuzayo okulungele ukugalelwa. Ishedyuli yokudubula ibalulekile. Yenyuka ngokukhawuleza kakhulu, kwaye uxinzelelo lwe-thermal luqhekeza iqokobhe. Iqokobhe elibaselweyo liethe-ethe kodwa liyakwazi ukumelana nobushushu. Uyiphatha ngohlobo lwentlonipho yexesha.
Ukugalela, ukuShakeout, kunye nomzuzu weNyaniso
Ukugalela yinxalenye emangalisayo. Umngundo, usatshisa ukusuka eziko, ufakwa kwiflask egcwele isanti ukuze uxhase. Intsimbi-yithi, a ialloy esekwe nickel iblade ye-injini ye-injini-inyibilikisiwe kwi-vacuum okanye kwi-induction furnace ukuya kumaqondo obushushu achanekileyo. Ukugalela kufuneka kukhawuleze kwaye kuqhubeke ukuphepha ukuvalwa okubandayo. Ubona ukukhukula kwesinyithi kwikomityi ye-sprue, kwaye ke ngumdlalo wokulinda njengoko uqina. Iimpawu ze-thermal zegobolondo zichaphazela ngokuthe ngqo ukwakheka kweenkozo zetsimbi. Yiyo loo nto iresiphi ye-ceramic ixhomekeke kakhulu kwiziseko ezininzi.
Yakuba ipholile, lixesha lokushukuma. La mandla akhohlakeleyo adibana ne-finesse. Uqhekeza iqokobhe leceramic kude, ngokuqhelekileyo ngehamile ye-pneumatic okanye itafile yokungcangcazela. Kuyangxola, kunothuli. Okushiyekileyo ngumthi wentsimbi, ogqunywe ngeraphu erhabaxa. Amalungu anqunyulwe kwi-sprue esembindini esebenzisa amavili abrasive okanye iisarha zebhendi. Eli lixesha lokuqala ubona ngenene isakhelo ekrwada. Ukuziva xa ubona ifom ecocekileyo, epheleleyo ivela kukukhululeka okucocekileyo. Imvakalelo xa ubona icandelo elilahlekileyo okanye ukuncipha okukhulu? Ukoyika.
Ukucoca kokuqala kubandakanya ukuqhushumba kwesanti okanye ukucocwa kweekhemikhali ukususa amasuntswana okugqibela eqokobhe. Emva koko kuqaliswa ukuhlolwa. Iitshekhi zomgangatho, uhlolo olubonakalayo kwiziphene zomhlaba, uvavanyo lokungena kwidayi kwiintanda. Kumacandelo abalulekileyo, afana nalawo e-QSY avelisa umatshini kwiindawo zokugqibela, ufudukela kwi-radiographic (X-ray) okanye uvavanyo lwe-ultrasonic ukufumana iimpazamo zangaphakathi. Kulapho kugwetywa khona amanyathelo angaphambili. Iqela le-porosity kwifilimu ye-X-reyi ihlala ilandwa emva kumcimbi wepatheni ye-wax okanye isiphene soyilo lwesango ukusuka kwiintsuku ezingaphambili.
Kutheni ingazange nje imalunga nokuCasa
Nantsi into yangoku ukujula ngentsimbi: kunqabile ukuphela komgca. Inxalenye ye as-cast ikufutshane-netha-milo engenanto. Ukuze isebenze, isoloko ifuna ukwenziwa ngoomatshini. Kulapho umanyano lubalulekile. Isiseko esibuqondayo ubuchwephesha yigolide. Baza kuyila ukuphosa kunye needatum zomatshini engqondweni, bongeze isibonelelo esincinci kodwa esaneleyo sesitokhwe, kwaye bathathele ingqalelo amanqaku okubamba. Imodeli ye-QSY yokunikezela zombini ukutyala imali kunye CNC Machining phantsi kophahla olunye kunengqiqo egqibeleleyo. Bangakwazi ukuphosa i-17-4PH i-valve yentsimbi yensimbi engenasici kunye nobuso obubalulekileyo botywino obushiywe njenge-cast, besazi kakuhle ukuba singakanani isitokhwe esinokusishiya kwii-mills zabo ze-CNC ukugqiba kwi-Ra 0.8 epheleleyo. Iphelisa ukukhombana ngeminwe phakathi kweevenkile ezahlukeneyo zokuthengisa kunye noomatshini.
Ukhetho lwezinto eziphathekayo lukwabalulekile kwinkqubo. Ukwenziwa kotyalo-mali igqwesa ngealloyi ekunzima ukuyitshintsha. Kuyonga ngakumbi ukuphosa imilo entsonkothileyo ukusuka kwi-Inconel 718 kunokuba uyitshise kwibhloko eqinileyo. Inkunkuma yenkqubo incinci. Kwiindawo ezincinci ezinomthamo ophezulu, njengeentloko zeklabhu yegalufa okanye ukufakelwa kwamazinyo, zisebenzisa i-wax ye-multi-cavity dies kunye ne-automated tree assembly. Kwi-volume ephantsi, iinxalenye ezinkulu-cinga enye impompo yendlu yokusebenza kwemigodi-inokuba ngumthi ohlanganiswe ngesandla kwiipateni ezenziwe ngeprototyping ngokukhawuleza. Inkqubo izikali, kodwa imigaqo engundoqo ayitshintshi.
Ndibone iivenkile zizama ukusika iikona-ziphinda zisebenzise i-slurry amaxesha amaninzi, zinciphisa amaxesha omisa, zitsiba uhlalutyo olupheleleyo lwe-thermal kuyilo lwenxalenye entsha. Phantse isoloko ibuyisela umva, ikhokelela kumazinga aphezulu alahlwayo acima naluphi na ugcino olubonwayo. Iinkampani ezihlala zihlala, njengazo zineminyaka engama-30 yembali, ziyayiqonda ukuba yinkqubo. Kumalunga nokulawula amakhulu okuguquguqukayo ukufikelela ukuhambelana. Ayingomlingo; kucokisekile, ngamanye amaxesha kuyadika, ukulawula.
Iingcinga zokugqibela: Inkqubo yoCongo
Ke, ukuphoswa kwentsimbi yewax, okanye ukuphosa utyalo-mali, ayisiyondlela enye. Sisakhelo. I-wax yindawo yokuqala, kodwa inkqubo ye-ceramic shell yintliziyo yokwenene, kwaye i-metallurgy ngumphefumlo. Impumelelo ilele kwindlela olawula ngayo intsebenziswano phakathi kwabo. Yinkqubo elungele ukuntsonkotha, kwii-alloys ezihleka izixhobo zokusika, kunye nezicelo apho ukusebenza kungqongqo yonke into.
Kwiinjineli eziyila indawo entsha, ingcebiso yam engacelwanga kukuthetha nesiseko sakho kwangoko. Musa ukuthumela nje imodeli yokugqibela ye-CAD yesicatshulwa. Babandakanye kwisigaba soyilo-lokwenza ukuveliswa. Ukutshintshwa kwe-angle yedrafti encinci, ukulungiswa kwe-radius efihlakeleyo, okanye isango elifudusiweyo linokuthetha umahluko phakathi kwe-95% yesivuno kunye ne-70% yesivuno. Ubungcali kumenzi odibeneyo abukho nje ekugaleleni isinyithi; Isekuhambeni lonke ikhonkco ukusuka kwiwax ukuya kwindawo egqityiweyo yomatshini.
Ekugqibeleni, into ephuma kwigobolondo ye-ceramic eyaphukileyo ingaphezulu kwesinyithi. Yincopho yolandelelwano olude lwamanyathelo alawulwayo, ngalinye lingqiyame kwelokugqibela. Xa isebenza, ivakala ingaphantsi njengemveliso kwaye ifana ne-alchemy, efunyenwe ngolingo, impazamo, kunye negrit eqokelelweyo. Elo libali lokwenyani emva kwewax.
