Ha lienjiniere li totobatsa likarolo tsa tšepe tse nepahetseng haholo bakeng sa li-valve tsa hydraulic, li-pompompo, kapa li-winch shafts—haholo-holo tlas’a khatello e matla, maemo a ho roala haholo kapa a chefo—ha li hloke mofani oa thepa feela. Ba hloka a mim metal ente molding process fektheri e utloisisang boitšoaro ba metallurgical, botsitso ba dimensional, le mekhoa ea ho hlōleha ha mosebetsi-eseng feela ho mamella setšoantšong.
Re bone merero e mengata haholo e ema sethaleng sa mohlala hobane moetsi ea khethiloeng o ile a tšoara MIM e le "ts'ebetso e 'ngoe feela ea ho bopa." Ha e le hantle, MIM e atlehileng bakeng sa likarolo tsa bohlokoa tsa thōmo e hloka ho kopanngoa ka thata pakeng tsa khetho ea phofo, tlhahiso ea li-binder, kinetics ea debinding, sintering profile control, le post-sinter machining. Ho QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., Re tšoara karolo e 'ngoe le e 'ngoe ea MIM joalo ka setulo sa valve sa cobalt-nickel alloy: phoso e le 'ngoe ea taolo ea khabone nakong ea sintering e ka baka microcracking tlasa 300-bar cyclic loading. Ke ka lebaka leo setsi sa rona se lumellanang le ISO Qingdao se sa faneng ka lits'oants'o kapa ho nyenyefatsa - re na le potoloho e felletseng ea mocheso, ho tloha ho 650 ° C catalytic debind ho isa ho 1280 ° C vacuum sintering ka tlhokomelo e nepahetseng ea phoka.
Bareki ba bangata ba hlokomoloha tšitiso ea bohlokoa: MIM e ipabola ho rarahanang ha sebopeho sa marang-rang - empa e le ka har'a meeli e thata ea jiometri. Botenya ba lebota bo tlameha ho lula pakeng tsa 1.5 mm le 8 mm. Likarolo tse ka holimo ho 6:1 li-gradients tsa kotsi. Li-Undercuts? Hoa khoneha-empa feela ka li-cores tsa ceramic tse senyehang, eseng lisebelisoa tse tloaelehileng. Re thusitse bareki ho hlophisa bocha likarolo tsa pompo ea alloy ea AMS 5387 ho felisa radii e bohale ea kahare, ho fokotsa ho sotha ha sintering ka 40% ha ba ntse ba boloka bots'epehi ba tsela ea phallo. Seo ha se khopolo-taba. Ke se etsahalang ha hao mim metal ente molding process fektheri e tsamaisa lotho ea MIM ea 120+ ka selemo ho li-feedstocks tsa boemo ba sefofane-'me e boloka sekhahla se seng le se seng sa ho honyela, vector ea warpage, le ho kheloha ha letsoalo ka sehlopha ka seng.
Mona ke se arolang ho nepahala ha MIM ho tsoa ho thepa ea MIM:
- Ho lateloa ha lintho tse bonahalang ho qala pele phofo e kena ka har'a hopper: Re fana ka li-coCrMo tse tiisitsoeng tsa khase le li-alloy powders tse nang le litlaleho tse feletseng tsa PMI-le ho netefatsa litaba tsa oksijene, kabo ea boholo ba likaroloana (D50 = 8.2-9.6 µm), le batch-by-batch e hlakileng ea density.
- Ho fana ka chelete ha hoa beheloa nako - ho behiloe leihlo: Sebakeng sa nako e tsitsitseng ea ho koloba, re latela tahlehelo ea boima ba nako ea 'nete ka li-sensor tsa gravimetric. Sekontiri se setseng sa 0.3% se etsa hore ho be le phetoho e itekanetseng ea boemo bo botle-hobane ho tlosoa ho sa fellang ho baka ho ruruha; ho qoelisoa ho fetelletseng ho memela ho peperana.
- Liprofaele tsa Sintering li ikhethile, eseng ka sebōpi: Ntlo ea cylinder pompo ea piston e fumana tsela e liehang ho feta ho 800-1000 ° C ho feta molomo oa karolo e tšesaane. Re fetola linako tsa bolulo ho ipapisitsoe le thermal mass modelling - eseng chate e kholo.
- Geometry ea Post-sinter ha e khonehe: Karolo e 'ngoe le e' ngoe ea MIM e etsa tlhahlobo ea CMM khahlano le mehala ea GD&T — eseng feela litekanyo. Re lekanya ho bata ha libaka tse koalang ho fihla ho ±1.2 µm, cylindricity on shaft magazines ho isa ho 0.8 µm, le bokaholimo ba metsi (Ra) litselaneng tsa mokelikeli ho isa ho ≤0.4 µm-e netefalitsoeng ka optical profilometry.
Ba bang ba ka pheha khang ea hore mochini oa CNC o fana ka ho nepahala ho feta MIM. 'Nete-bakeng sa li-geometri tse bonolo. Empa leka ho tšoara ± 0.015 mm concentricity ho pholletsa le libore tse hlano tsa coaxial motheong o le mong oa 316L oa tšepe e sa hloekang, e 'ngoe le e 'ngoe e na le likhoele tse ka hare le likou tsa lubrication tse entsoeng ka sefapano. Ho lokisa karolo eo ho hloka li-setups tse tšeletseng, liphetoho tse tharo tsa sebopeho, le ho hoholeha ho ke keng ha qojoa ha mocheso. Mofuta oa MIM? Karolo e le 'ngoe e tala, sinter e le' ngoe, ts'ebetso e le 'ngoe ea ho qetela-le 22% ea theko e tlaase ka palo e ka holimo ho 500 pcs / selemo. Re e paka: kotareng e fetileng, re tsamaisitse lirolara tse 1,200 tsa T800 tsa alloy center bakeng sa sistimi ea winch ea koloi ea boenjiniere. Bohle ba fetisitse tlhahlobo ea 100% ea mojaro o sebetsang ho 18,500 N axial force-zero rework.
Ho tšepahala hoo ho tsoa ho kopanyo e otlolohileng eo u ka e netefatsang. Setsi sa rona ha se na mecheso ea MIM feela le liobelo tsa sinter — empa hape le litsi tsa CNC tse nepahetseng tse khonang ho fetola likarolo tsa CoCr tse thata ho 85 HRC, lionto tse futhumatsang mocheso tse lekantsoeng ho ± 2 ° C, le mehala ea passivation e tsamaellanang le ASTM A967. Ha moreki a romella setšoantšo bakeng sa plug ea AMS 5387 e nang le masoba a foufetseng le lifahleho tse tiisitsoeng, ha re botse "Na u ka e khona?" Rea botsa: "Ke boemo bofe bo bobe ka ho fetisisa ba khatello ea kelello? Bophelo ba tšebeletso bo lebeletsoeng ke bofe? Ke mokhoa ofe oa ho hlōleha o etsang hore u lule u falimehile?" Ebe re khetha feedstock e nepahetseng, re etsisa ho sotha ha sintering ho Simufact Additive, ho haha hlobo ka tšepe e thata ea H13 le liteishene tse pholileng tsa conformal, ebe o notlela lits'ebetso pele ho thunya ea pele.
Haeba u hlahloba a mim metal ente molding process fektheri, tlola libukana tse benyang. Kopa: (1) lirekoto tsa sintering lot tse bontšang ho fapana ha sekhahla ho pholletsa le tlhahiso ea tlhahiso, (2) CMM e tlaleha ho bapisa as-sintered vs. finish geometry karolong e tšoanang le ea hau, le (3) bopaki ba setifikeiti sa thepa bakeng sa kereiti ea alloy ea hau - eseng feela "ISO 13322-2 compliant powder." Ho QINGDAO QIANGSENYUAN TECHNOLOGY CO., LTD., litokomane tseo ha lia notleloa ka har'a khabinete ea lifaele. Li khomaretsoe ho PO e 'ngoe le e' ngoe, li nchafatsoa ka nako ea nnete, 'me li arolelanoa pele ho tumello ea lisebelisoa. Hobane ho nepahala ha se lefapha. Ke tlhophiso ea kamehla.
