Uma othile ethi 'izinhlobo ze-powder metallurgy,' izingqondo eziningi zigxuma ziqonde emshinini wokucindezela we-classic-and-sinter. Lelo ihhashi lokusebenza, impela, kodwa yisango lokuqala nje. Ingxoxo yangempela iqala lapho ubuza: yimuphi umsebenzi wokugcina wengxenye? Ingabe i-bushing elula, ene-low-stress, noma ingxenye ye-turbine ebona ukushisa okuphezulu namandla ajikelezayo? Lowo mehluko ukuguqula usuka kwelinye igatsha lalobu buchwepheshe uye kwelinye ngokuphelele. Ngibone amadizayini amaningi kakhulu engena lapho unjiniyela acacise ibanga lezinto ezibonakalayo kodwa engazange alwe ngokugcwele nemithelela yomzila wokukhiqiza empilweni yokukhathala noma ukuzinza kobukhulu. Lelo gebe phakathi kwemodeli ye-CAD kanye neqiniso le-sintered yilapho izinhlobo zangempela ze-powder metallurgy zihlala khona.
Cindezela kanye ne-Sinter: Isisekelo kanye Nemikhawulo Yaso Engabonakali
Ake siqale ngeyo yonke indawo. Uthatha impushana yensimbi, imvamisa ingxube esekwe ku-iron nethusi, i-nickel, ne-graphite efakwe ngaphambili noma ehlanganisiwe, uyicindezele endaweni eqinile ekushiseni kwegumbi, bese uyishisisa esithandweni somoya esilawulwayo. Amabhondi akha ngokusabalaliswa kwesimo esiqinile. Isebenza kahle ngokumangalisayo kuvolumu ephezulu, ukwenza umumo. Amagiya, ama-sprockets, izingxenye zesakhiwo ezintweni zikagesi—izibonelo ezingenakubalwa.
Kodwa nansi into ebanjwayo wonke umuntu: ukuminyana. Ukucindezela okuvamile kanye ne-sinter kuvamise ukuphumela ngaphandle cishe ku-92-95% wokuminyana kwethiyori. Leyo porosity esele ilungile ezinhlelweni eziningi, kepha ibulala izakhiwo eziguqukayo. Ijika lamandla okukhathala liyancipha ngokudumazayo kusenesikhathi. Ngikhumbula iphrojekthi yegiya lepompo le-hydraulic lapho ama-prototypes okuqala avela esitolo esijwayelekile se-P/M ehlulekile ngokushesha kunensimbi ekhandiwe elingana nokuhlolwa kokubekezela. Isizathu esiyinhloko kwakungewona amakhemikhali; kwakuyilezo zimbotshana ezincane ezisebenza njengezigxili zokucindezeleka. Kwadingeka sishintshe ukucabanga kwethu.
Yilapho izinhlelo ze-alloy kanye nezinto zokugcoba zibaluleke kakhulu. I-FN-0205 (insimbi ene-nickel engu-2% kanye ne-graphite engu-0.5%) izoziphatha ngendlela ehluke kakhulu ku-FC-0208 (enethusi elingu-2%) ngesikhathi i-sintering, ithinte ukuguqulwa kobukhulu namandla okugcina. Futhi iphuzu lamazolo esithandweni sakho somlilo? Ibalulekile ekuncishisweni kwe-oxide, ikakhulukazi ngezinto ezifana ne-chromium noma i-manganese. Yenza okungalungile, futhi unengxenye ephukile. Akuyona nje inqubo; kuwukuhlolwa kwamakhemikhali ngaphansi kokushisa.
Lapho Ukuminyana Kungaxoxiswana: Ukubunjwa komjovo wensimbi nangaphezulu
Ngakho-ke, kuthiwani uma udinga ukuminyana okuseduze nokugcwele kanye nesimo esiyinkimbinkimbi ukuthi ukwenza imishini kusuka kusitoko sebha kungamosha u-80% wezinto ezibonakalayo? Lowo ngumbuso we I-Metal Injection Molding (MIM). Uxuba kahle kakhulu, impushana eyindilinga ne-polymer binder, uyibumbe njengepulasitiki, bese ususa ngokucophelela isibophezelo (i-debinding) ngaphambi kokusifaka. Ingxenye incipha kakhulu—cishe ngo-15-20%—kodwa ngokufanayo uma isitoko sakho sokuphakelayo sinohlobo olufanayo. Ufinyelela ukuminyana ngaphezu kuka-98%, ngokuvamile eduze kwama-99%.
Ubuhle be-MIM busemininingwaneni efana nezintambo zangaphakathi, ama-undercuts, nezindonga ezincane. Siyisebenzisele ingxenye yensimbi yokuhlinza, ingxenye yensimbi engagqwali engu-17-4 PH enomshini we-latch oyinkimbinkimbi. Ukumachini bekuyiphupho elibi lezinto zokulungisa nokuphuka kwamathuluzi. I-MIM ikwenze kwaba ucezu olulodwa, njenge-sintered. Kodwa udeveli usekubopheni. Uma i-binder ingasuswanga ngokulinganayo, uthola imifantu noma amabhamuza. Umjikelezo oshisayo ohamba kancane, othambile, hhayi umsebenzi wamandla anonya.
Lokhu kuxhuma kwelinye igatsha: I-Hot Isostatic Pressing (HIP). Ngezinye izikhathi uyisebenzisela yona yodwa ngempushana ku-can (isitsha se-HIPing), kodwa kaningi, kuyinqubo yesibili yokuvala i-porosity esele engxenyeni ehlanganisiwe. Sithatha imizimba yama-valve ebucayi eyenziwe ngokucindezela-ne-sinter futhi siyibeke emjikelezweni we-HIP—ingcindezi ephezulu ye-argon ezingeni lokushisa eliphezulu. Icindezela lezo zimbotshana zangaphakathi zivaleke, ithuthukise ngokuphawulekayo i-ductility nobuqotho bengcindezi. Yengeza izindleko, kodwa ezintweni zikawoyela negesi, ithikithi lokuthola iziqu.
Umzila Wokuqamba: I-Powder Forging kanye Ne-Niche Yayo
Bese kuba khona impushana. Wenza i-preform ngokucindezela okuvamile, bese uthatha leyo sintered (noma ngezinye izikhathi engafakwanga) futhi uyifake efashini elivaliwe. Lokhu kufeza ukuminyana okuphelele kanye nezakhiwo ezinhle kakhulu zemishini, eduze nama-forgings akhiwe. Isivuno sezinto ezibonakalayo sihle kakhulu. Kube wukuhamba kwezingxenye zezimoto ezinengcindezi ephezulu njengezinduku zokuxhuma.
Kodwa izindleko zamathuluzi zibalulekile, futhi udinga umthamo ukuze uzithethelele. Ukuphatha okushisayo kuyakhohlisa—ukuthola i-preform kuzinga lokushisa elifanele ngokufanayo ukuze kufojwe ngaphandle kwesikali noma ukususwa kwe-carburization. Ngibone izivivinyo lapho idizayini ye-preform engafanele iholele ekufongeni okugoqiwe (ama-laps), isici esiyinhlekelele engxenyeni eguqukayo. Iwuhlobo olunamandla lwe-powder metallurgy, kodwa ludinga ukuhlonishwa kobuciko bokwenza izinto njengesayensi yempushana.
Ukukhiqiza Okungeziwe: I-Frontier Entsha Yomndeni
Awukwazi ukukhuluma ngezinhlobo namuhla ngaphandle kokuthinta ukukhiqiza okungeziwe, noma I-Powder Bed Fusion. I-Selective Laser Melting (SLM), i-Electron Beam Melting (EBM). Lena i-powder metallurgy ngomqondo wayo ongokoqobo: ukwakha ungqimba lwengxenye ngongqimba ngokuncibilika ngokuphelele okuyimpushana ngomthombo wamandla ogxilile. Ukuminyana kungaba ngu-99.9%+ uma amapharamitha adayiwe.
Inkululeko iwuguquko, kodwa ukuphela kwendawo kanye nengcindezi yangaphakathi kuwukuhwebelana. Indawo ephrintiwe inesici esimahhadlahhadla esivela ezinhlayiyeni zempushana ezincibilike kancane, ezimbi ngokukhathala uma zingelashwa. Futhi ingcindezi eyinsalela evela ekushiseni ngokushesha nasekupholiseni kudinga ukukhululeka kwengcindezi noma umjikelezo wokucindezela we-isostatic oshisayo. Siyihlolele umklamo wangokwezifiso, wevolumu ephansi e-Qingdao Qiangsenyuan. Ijiyomethri yayiyilungele, kodwa ngobuqotho obudingekayo kanye nezindleko zengxenye ngayinye ngevolumu yethu, ekugcineni sihambe nokusakaza okutshalwa kwezimali kwe-prototype run. I-AM yayiyithuluzi eliphelele, kodwa kulowo msebenzi othize, bekungelona ithuluzi elilungile. Lowo umehluko obalulekile.
Lapho Imigwaqo Yokusakaza kanye Ne-Powder Metallurgy Iwela khona
Lokhu kungiletha ku-tangent efanele. Ngo I-Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), namashumi eminyaka egobolondweni nasekutshalweni kwezimali, ingxoxo ivame ukuphendukela ekusebenzeni kwezinto ezibonakalayo. Uma iklayenti lidinga ingxenye ku-superalloy esekelwe ku-nickel yesevisi yezinga lokushisa eliphezulu, ukukhetha phakathi kokutshala imali kanye nomzila we-powder metallurgy njenge-HIP iba phakathi nendawo. I-Casting ingaphatha kahle izimo ezinkulu, eziyinkimbinkimbi, kodwa ukwakheka okusanhlamvu namandla e-micro-porosity kuyimingcele. I-POwder HIPing ikunikeza i-microstructure enhle, efanayo, izakhiwo ze-isotropic. Isinqumo sincike kusayizi, ubunkimbinkimbi, izidingo zesakhiwo, nosayizi wendawo. Kwesinye isikhathi, ikhambi elingcono kakhulu yi-hybrid: sebenzisa i-preform ekhonjiwe bese usebenzisa i-coating ephuma kumpushana ngesifutho esishisayo sokumelana nokuguga. Akukhona ukuthi umuntu ungcono; imayelana nenhlanganisela efanele yezinqubo.
Isici Esinganakiwe: Impushana Ngokwayo
Zonke lezi zinhlobo zincike ezintweni zokuqala: impushana. Igesi ye-athomu, i-athomu yamanzi, inqubo ye-electrode ejikelezayo ye-plasma (PREP) -indlela yokukhiqiza ichaza ukuma kwezinhlayiyana, ukusabalalisa usayizi, kanye ne-microstructure yangaphakathi. Ku-MIM, udinga lezo zinhlayiya ezinhle, eziyindilinga ukuze zigeleze kahle futhi zipakishwe. Ngokucindezela okuvamile, okungajwayelekile, izinhlayiya ezinama-athomu emanzini zihlangana kangcono ukuze zibe namandla aluhlaza. Uma usebenza ngama-alloys asebenzayo afana ne-titanium noma uhlu olukhethekile lwe-alloys lwe-QSY (okusekelwe ku-cobalt, okusekelwe ku-nickel), ukuphatha impushana ngaphansi kwe-inert atmosphere akunakuxoxiswana ngayo. I-oxygen pickup ingumbulali othule we-ductility.
Lokhu ngakufunda kabuhlungu kusenesikhathi. Inqwaba engu-316L yempushana engagqwali ye-MIM yayinomswakama ophakeme kancane kune-spec. Kubangele ukuhlukaniswa kwe-binder-powder ngesikhathi sokubunjwa, okuholela ku-voids ebonakala kuphela ngemva kokucwiliswa. Iqoqo lonke laliyizicucu. Impushana iyisisekelo. Iphutha lapho alinakulungiseka phansi komfula.
Ngakho-ke, uma ngicabanga 'ngezinhlobo ze-powder metallurgy,' ngicabanga ngesihlahla sesinqumo. Qala ngomsebenzi wengxenye, izidingo zayo zendawo, ijometri yayo, nezindleko ezamukelekayo. Leyo ndlela ikuholela ekubeni impushana efanele kanye nendlela efanele yokuhlanganisa. Akulona nje uhlu lwezinketho; kuwuchungechunge lokuhwebelana kwezobuchwepheshe nezomnotho, okunomoya we-porosity ocashe ngemuva kwakho konke ukukhetha. Umgomo uwukukhetha inqubo eyenza leso sipoki sinyamalale, noma okungenani sisenze singabi nangozi empilweni ehloselwe ingxenye.
