Saib, thaum cov neeg feem coob hnov 'MIM hlau txhaj tshuaj molding', lawv xav tias nws yog qee cov mos txwv khawv koob rau kev ua cov hlau tsis yooj yim. Cov ntawv qhia ua suab zoo li koj tsuas yog ncuav hmoov rau hauv lub tshuab thiab tawm pops cov khoom tiav. Qhov ntawd yog qhov kev tsis ncaj ncees loj tshaj plaws. Nyob rau hauv qhov tseeb, nws yog ib tug txheej txheem ntawm tsis tu ncua kev sib haum xeeb thiab nuanced kev txiav txim. Nws tsis yog ib txwm yog lo lus teb, thiab kev paub thaum twg yuav tsum taug kev yog qhov tseem ceeb raws li kev paub txog kev khiav haujlwm. Kuv tau pom ntau txoj haujlwm ua tsis tiav vim ib tus neeg sim yuam MIM qhov twg nws tsis koom nrog, ntxias los ntawm cov lus cog tseg ntawm qhov ntim siab thiab net-zoo li.
Lub Cev Dance: Pub khoom noj, Tooling, thiab Sintering Gamble
Lub plawv ntawm MIM hlau txhaj tshuaj molding tsis yog molding - nws yog cov khoom noj. Tau txais qhov kev sib xyaw ntawm cov hmoov hlau zoo thiab cov ntawv khi ncaj nraim yog qhov zoo dua li kev tshawb fawb. A 2% sib txawv nyob rau hauv hmoov loading yuav wreck dimensional stability tom qab sintering. Peb ib zaug tau txais tus qauv 17-4 PH feedstock los ntawm tus neeg muag khoom tshiab rau lub tshuab phais phais. Nws molded zoo nkauj, tab sis thaum lub sij hawm debinding, lub binder system tawg, ua rau muaj kev puas tsuaj loj nyob rau hauv lub cub tawg. Qhov ntawd yog $ 40k cov cuab yeej siv tau kawm: tsis txhob xav tias cov khoom noj khoom haus yog cov khoom lag luam.
Thiab tooling ... nws yog ib tug tsiaj nyaum sib txawv tshaj li yas txhaj pwm. Koj tab tom tsim rau 20-25% shrinkage, tab sis nws tsis yog isotropic. Nws hloov nrog ib feem geometry, phab ntsa thickness, thiab txawm li cas cov feedstock ntws hauv kab noj hniav. Peb muaj lub bracket rau aerospace sensor, ntev, nyias. Thawj qhov txhaj tshuaj tuaj tawm ntawm pwm zoo meej, tab sis tom qab sintering, nws warped zoo li txiv tsawb. Qhov kho tsis nyob hauv qhov cub; nws yog nyob rau hauv ntxiv hloov maj mam, counter-intuitive curvature rau pwm kab noj hniav nws tus kheej. Koj tsis tau tsim ib feem, koj tab tom tsim lub distorted pre-sintered version ntawm nws.
Sintering yog qhov twg cov hlau tiag tiag, thiab nws yog cov kauj ruam siab tshaj plaws. Qhov kub thiab txias profile, huab cua (hydrogen, nitrogen-argon mix), thiab lub sijhawm yog qhov tseem ceeb. Kev nrawm dhau ntawm tus nqi nce siab, koj tau txais cov binder boil-off defects. Tsis tshua muaj temp, koj nyob nraum nrog ib tug ntxeem tau, tsis muaj zog qauv. Kuv nco qab ib pawg ntawm stainless hlau xauv pins rau cov neeg siv khoom hnyav. Lawv dhau tag nrho cov kev kuaj pom thiab qhov loj me tab sis ua tsis tiav hauv kev sim teb - qhov tawg tawg. Lub hauv paus ua rau? Lub thermocouple drift nyob rau hauv lub qhov cub sintering tsim ib qho chaw txias 30 ° C. Cov khoom ntsia hlau tab sis yeej tsis tau sib sau ua ke. Qhov ntawd yog qhov insidious ntawm MIM; ib qho tsis zoo tuaj yeem muab faus tob rau hauv microstructure.
Qhov twg MIM ci (Thiab qhov twg nws tsis)
Yog li thaum twg hlau txhaj molding ua siab ntev? Nws yog qhov ci ntsa iab rau me me, nyuaj heev, qhov ntim siab uas yuav tua neeg rau lub tshuab. Xav tias cov iav sib dhos nrog sab hauv splines, ntau lub dav hlau txuas, los yog cov khoom siv nrog cov undercuts thiab nyias phab ntsa. Kev vam meej classic yog titanium alloy tivthaiv rau cov khoom siv kho mob hnav. Machining nws los ntawm cov khoom yog txwv tsis pub kim thiab khib nyiab. MIM tau txais peb mus rau 95% net zoo, xav tau tsuas yog ib qho tseem ceeb bore tiav-machined. Qhov ntim (200k + ib xyoos twg) tau tsim nyog rau NRE rau kev siv thiab kev txhim kho txheej txheem.
Tab sis ntawm no yog qhov ntxeev sab. Yog tias koj qhov chaw yog qhov yooj yim - qhov yooj yim spacer lossis lub tiaj tus bracket - tsis nco qab MIM. Stamping lossis CNC yuav pheej yig dua thiab sai dua. Tsis tas li ntawd, yog tias koj xav tau cov cuab yeej siv tshuab huab cua, zoo li lub zog tensile kawg ntawm cov khoom siv wrought, MIM yuav luv luv. The sintering process, while creating near-full density, still leaves a microstructure that's different from forged metal. Peb yuav tsum tham tus neeg siv khoom tawm ntawm kev siv MIM rau qhov tseem ceeb, kev cuam tshuam loj heev hauv cov cuab yeej downhole. Qhov kev pheej hmoo ntawm qhov tsis tshua muaj sintering tsis tsim nyog, txawm tias 100% MPI tshuaj xyuas.
Lub Machining Handshake: Yog vim li cas tom qab kev ua haujlwm feem ntau tsis sib tham
Qhov no yog qhov uas net-zoo cog lus hits kev muaj tiag. Ntau qhov MIM xav tau kev ua haujlwm thib ob. Lub qhov yuav tsum tau remed rau ib tug meej H7 kam rau ua, los yog ib tug sealing nto yuav tsum tau rau hauv av. Tias yog vim li cas lub khw lub peev xwm MIM tsuas yog zoo li nws qhov kev txhawb nqa qis. Kuv tau ua haujlwm nrog cov neeg koom tes zoo li Qingdao Qiangsenyuan Technology Co., Ltd. (QSY). Lawv keeb kwm tsis yog nyob rau hauv xwb MIM; nws nyob rau hauv peev casting thiab precision CNC machining. Qhov ntawd yog qhov tseem ceeb. Lawv tau txais tias qhov sintered tsis yog qhov kawg. Lawv tuaj yeem saib ntawm MIM tivthaiv thiab paub tias cov ntaub ntawv twg yuav tsum clamp rau machining, yuav ua li cas cov kev ntxhov siab uas seem yuav cuam tshuam rau kev txiav, thiab seb qhov ua tau zoo dua hauv pwm lossis ntawm lub tshuab dhos tom qab. Rau ib tug series ntawm cobalt-chromium alloy valve daim hlau peb tau ua, lub flatness yuav tsum tau tshaj sintering muaj peev xwm. QSY pab pawg tau qhia txog qhov yooj yim MIM tsim nrog cov khoom lag luam ntau dhau, uas lawv tom qab ntawd ua kom tiav hauv av. Cov txiaj ntsig tau zoo tag nrho, thiab tus nqi qis dua li sim ua kom tsis tuaj yeem sintering tolerances.
Kev xaiv cov khoom ua si tseem ceeb ntawm no thiab. MIM ua haujlwm ntau yam-los ntawm ntau stainless hlau rau kab txawv Nickel-raws li alloys. Tab sis machinability tom qab sintering txawv wildly. A 316L stainless ib feem tshuab tau yooj yim. Lub sintered tungsten hnyav alloy? Qhov ntawd yog ib zaj dab neeg sib txawv, xav tau cov cuab yeej tshwj xeeb thiab tsis muaj. Koj yuav tsum npaj tag nrho cov saw hlau, tsis yog cov kauj ruam molding xwb.
Kev Ua Tsis Taus thiab Cov Lus Qhia Lawv Stamp rau Koj
Koj kawm tau ntau dua los ntawm cov khoom khib nyiab dua li phau ntawv. Thaum ntxov, peb tau nrhiav ib qhov project rau qhov nyuaj aluminium MIM. Nyob rau hauv daim ntawv, nws yog zoo tagnrho: intricate txias channel, siab ntim. Tab sis txhuas hmoov yog pyrophoric, nws oxide txheej yog npau suav phem rau sintering, thiab shrinkage yog txawm ntau unpredictable. Txoj haujlwm tau siv ntau lub hlis thiab suav tsis txheeb ua ntej peb tua nws. Cov neeg siv tau hloov mus rau a plhaub molding txheej txheem rau qhov tshwj xeeb alloy thiab geometry. Nws yog ib qho kev ceeb toom me me tias MIM yog ib qho ntawm cov hmoov hlau metallurgy, tsis yog kev hloov pauv thoob ntiaj teb rau tag nrho lwm cov txheej txheem tsim.
Lwm qhov ua tsis tau zoo yog hom tshuaj pleev ib ce. Rau cov neeg siv khoom siv hluav taws xob hauv vaj tse, qhov chaw zoo li-sintered muaj me ntsis, txiv kab ntxwv-tev zoo nkauj. Nws tau ua haujlwm zoo, tab sis zoo nkauj tsis txaus siab rau daim ntawv thov. Polishing yog kim heev. Peb yuav tsum tau kho cov hmoov particle loj tis thiab sintering cua kom ua tau ib tug smoother nto ncaj tawm ntawm lub cub tawg, uas ntxiv cov nqi thiab lub sij hawm mus ncig. Qhov takeaway? Surface finish yog ib qho kev qhia tshwj xeeb uas yuav tsum tau tham thaum pib, tsis yog tom qab.
Qhov Tseeb Outlook: Kev Sib Koom Tes thiab Kev Ntsuam Xyuas Ncaj Ncees
Mus tom ntej, tus nqi ntawm MIM hlau txhaj tshuaj molding tsis muaj nyob rau hauv lub tshuab nqus tsev. Nws lub zog yog nyob rau hauv ua ib qho cuab yeej hauv kev tsim khoom dav dav. Ib lub khw uas tuaj yeem muab MIM rau cov tub ntxhais complex, CNC machining rau cov yam ntxwv tseem ceeb, thiab tej zaum txawm peev casting rau cov qauv loj dua, muab cov txiaj ntsig zoo tiag tiag. Nws tso cai rau kev xaiv cov txheej txheem ncaj ncees raws li qhov xav tau tiag tiag -geometry, khoom siv, ntau, thiab tus nqi - tsis yog ntawm cov khoom siv hauv lub tsev xwb.
Rau cov engineers tsim ib feem tshiab, kuv cov lus qhia tsis tseeb yog qhov no: koom nrog koj tus khub tsim khoom ntawm lub tswv yim theem. Nqa lawv daim duab kos. Ua ntej txog qhov ntim thiab kev ua haujlwm xav tau. Ib tug zoo khub, ib tug nrog sib sib zog nqus foundry thiab machining cov hauv paus hniav zoo li koj pom ntawm QSY, yuav qhia rau koj yog tias MIM yog qhov haum lossis yog tias koj tau txais kev pabcuam zoo dua los ntawm a plhaub molding hauv nrum hlau los yog machined billet ntawm hlau. Tej zaum lawv tau pom tag nrho. Lub hom phiaj tsis yog muag koj ntawm MIM; nws yog kom tau txais koj ib feem txhim khu kev qha, nqi-zoo. Qee zaum, txoj kev ntawd coj ncaj nraim los ntawm kev txhaj tshuaj molding tshuab. Feem ntau, nws tsis yog. Paub txog qhov sib txawv yog qhov cais cov neeg nyeem phau ntawv los ntawm cov neeg uas tau siv ntau xyoo tau txais cov ntxhiab tsw ntawm cov khoom noj sov thiab sintering rauv tawm ntawm lawv cov khaub ncaws.
