Koj saib 'kev nqis peev casting inconel 718' thiab koj tau txais dej nyab ntawm cov ntaub ntawv: 1400 ° F tensile lub zog, zoo heev creep rupture, oxidation kuj mus txog 1300 ° C. Qhov koj tsis tau txais yog qhov kev xav ntawm lub plhaub tawg ntawm dewax, lossis lub sijhawm dab dej thaum NDT daim ntawv tshaj tawm qhia pom qhov tsis pom tseeb hauv ntu tseem ceeb. Daim ntawv spec ua rau nws suab zoo li daws teeb meem. Tsis yog. Nws yog kev sib tham nrog physics, thiab cov hlau feem ntau muaj qhov kawg hais.
Alloy tsis yog qhov teeb meem. Cov txheej txheem yog.
Txhua tus fixates ntawm Inconel 718 nws tus kheej - cov khoom xyaw, cov ntawv pov thawj. Tab sis nyob rau hauv peev casting, alloy tsuas yog cov khoom siv raw. Qhov kev sib tw tiag tiag yog kev taug kev los ntawm siv quav ciab mus rau qhov ua tiav casting. 718 muaj tus cwj pwm phem ntawm kev tsim Laves theem, cov nkig intermetallic tebchaw, yog tias lub solidification tsis nruj tswj. Koj tsis tuaj yeem nchuav nws li 304 stainless. Cov yam ntxwv thermal yog txawv. Lub shrinkage yog txawv. Txoj kev uas nws reacts nrog lub plhaub ceramic yog txawv.
Kuv nco qab ib pawg rau lub turbine shroud ntu. Lub geometry yog nyias-walled tab sis complex. Peb tau txais cov chemistry zoo meej, tab sis cov castings ua tsis tiav kev nyuaj siab rupture xeem. Qhov teeb meem? Peb tau siv lub plhaub txheej txheem-ib hom fused silica ntsej muag lub tsho. 718, ntawm cov qhov kub thiab txias, tau hnov qab nws tsuas yog txaus los ua kom cov qoob loo degradation. Nws tsis yog qhov tsis xws luag loj, tab sis nyob rau hauv kev nthuav dav, koj tuaj yeem pom qhov embrittlement. Daim ntawv spec rau lub plhaub tsis tau hais txog qhov kev sib tshuam. Koj kawm tau qhov nyuaj.
Qhov ntawd yog qhov 30 xyoo ntawm lub khw nyiam Qingdao Qiangsenyuan Technology Co., Ltd. (QSY) los ua si. Nws tsis yog hais txog qhov muaj qhov cub; nws yog hais txog lub koom haum nco txog uas lub plhaub zaub mov ua haujlwm nrog cov nickel-based alloys. Lawv lub website, tsi.com, teev lawv cov hauj lwm nrog tshwj xeeb alloys, tab sis cov kev paub tiag tiag yog nyob rau hauv lawv cov txheej txheem txheej txheem - lub tweaks rau preheat kub thiab pouring speeds uas ua rau qhov sib txawv ntawm lub suab casting thiab seem.
Ciab, Plhaub, thiab Dance ntawm Thermal Expansion
Wb tham txog lub plhaub. Rau 718, koj feem ntau txav deb ntawm cov txheej txheem silica-based systems. Peb hloov mus rau lub ntsej muag zircon-raws li lub tsho tiv no thiab ib qho alumina-silicate thaub qab. Vim li cas? Coefficient ntawm thermal expansion. Koj xav tau lub plhaub los tiv thaiv lub thermal poob siab ntawm ~ 1500 ° C hlau tab sis kuj yuav tsum tsis muaj zog txaus kom tshem tawm tom qab yam tsis muaj kev cuam tshuam rau kev siv tshuab ua phem uas tuaj yeem ua haujlwm-nrhiav qhov chaw casting. Nws yog ib qho kev sib npaug.
Cov kauj ruam dewaxing yog qhov tseem ceeb. Nrog steel, autoclave dewaxing yog ncaj nraim. Nrog rau kev ua haujlwm siab zoo li 718, qhov twg cov qauv siv quav ciab yuav loj dua los yog muaj cov seem tuab, koj yuav raug lub plhaub tawg los ntawm lub zog nrawm yog tias lub voj voog tsis kho. Peb ib zaug poob ib tsob ntoo pwm tag nrho vim tias lub voj voog autoclave hnyav dhau lawm. Lub plhaub zoo li zoo, tab sis cov kab plaub hau tawg cia cov hlau nkag mus, tsim cov fins loj heev thiab ua rau qhov tseeb qhov tseeb. Tam sim no, peb feem ntau siv txoj kev qeeb qeeb, flash dewax rau 718 txoj haujlwm tseem ceeb, txawm tias nws ntxiv sijhawm.
Plhaub ci, los yog preheating, yog lwm qhov kev txiav txim hu. Ncuav rau hauv lub plhaub uas txias dhau, thiab koj yuav muaj kev phom sij. Kub dhau heev lawm, thiab koj tuaj yeem ua rau cov tshuaj tiv thaiv hlau-plhaub thiab ua kom cov nplej loj. Rau ib tug complex ib 718 casting, peb feem ntau tsom rau lub plhaub preheat nyob ib ncig ntawm 1000 ° C, tab sis qhov ntawd yog tom qab ntev, qeeb ramp-up kom tsav tawm tag nrho cov volatiles yam tsis muaj shocking lub ceramic. Nws tsis yog tus lej koj pom hauv phau ntawv; nws yog ib qho koj tuaj txog tom qab ob peb qhov ua tsis tiav.
Rooj vag, pub, thiab Quest rau Soundness
Pub peev casting inconel 718 yog ib daim duab kos duab. Nws qhov khov nab kuab tsis yog dav li qee cov superalloys, tab sis nws tseem xav tau lub siab dawb, kub risers. Lub rooj vag kaw lus yuav tsum tau tsim los txo qis kev kub ntxhov-ua rau muaj kev kub ntxhov ua rau cov oxide suav nrog, uas ua rau tuag taus hauv cov khoom siv dav hlau. Peb siv computer simulation tam sim no, tab sis thaum ntxov simulations feem ntau zoo siab heev. Lawv yuav qhia zoo meej filling thiab pub mis. Qhov tiag casting yuav muaj shrinkage porosity nyob rau hauv ib tug tuab flange.
Zaj lus qhia? Simulation yog ib tug qhia, tsis yog ib tug yaj saub. Koj tseem xav tau tshaj-engineer lub feeders rau 718. Peb feem ntau siv lub tes tsho exothermic feeder tshwj xeeb tsim rau cov nickel alloys kom lub riser kub ntev dua. Txawm li ntawd los, qee zaum koj yuav tsum tau ntxiv me me txias hauv qhov chaw muaj tswv yim kom yuam kev taw qhia kom muaj zog mus rau tus riser. Nws yog txheej txheem tactile ntawm kev tshuaj xyuas thiab rov ua dua. Ib tug khub zoo li QSY, nrog rau lawv cov keeb kwm tob hauv plhaub molding thiab peev casting, feem ntau muaj ib lub tsev qiv ntawv ntawm cov ntaub ntawv pov thawj kev tsim qauv rau cov tsev neeg sib txawv, uas yog lub taub hau loj loj.
Tom qab casting, lub rooj vag thiab risers yog tsiaj nyaum tshem tawm. 718 ua hauj lwm-hardens incredibly ceev. Yog tias koj sim pom lossis zom nws zoo li carbon steel, koj yuav hlawv cov hniav thiab ua rau muaj kev ntxhov siab tawg. Abrasive waterjet txiav los yog tshwj xeeb band saws nrog txoj cai pub thiab ceev yog qhov tseem ceeb. Nws yog tus nqi thiab lub sijhawm ntau yam tsis nco qab suav rau hauv lawv qhov kev tsocai thawj zaug.
Kev kho cua sov: qhov twg cov cuab yeej ua tau (los yog tawg)
Qhov no yog qhov feem ntau ntawm qhov tsis ua hauj lwm hauv cov khoom siv. Koj tau txais qhov zoo nkauj, suab peev casting. Tom qab ntawd koj rhuav tshem nws nyob rau hauv lub tshav kub kho qhov cub. Rau wrought 718, kev kho mob yog tus qauv: kev daws teeb meem thiab hnub nyoog. Rau cam khwb cia 718, nws txawv. Koj tab tom cuam tshuam nrog as-cast microstructure, cais, thiab cov theem Laves muaj peev xwm.
Cov txheej txheem kev coj ua yog kev kho homogenization ua ntej-tuav ntawm ib ncig ntawm 1100 ° C rau cov xuab moos kom yaj cov Laves thiab txawm tias tawm ntawm qhov muaj pes tsawg leeg. Hla qhov no, lossis ua tsis ncaj ncees lawm, thiab kev laus tom ntej yuav tsis tsim cov gamma ob npaug rau prime precipitates uniformly. Qhov tshwm sim? Cov khoom siv tsis sib xws. Kuv tau pom castings dhau UT tab sis ua tsis tiav batch tensile xeem vim tias lub voj voog kho cua sov yog raws li cov khoom siv forged spec.
Atmosphere tswj yog tsis-negotiable. Nqus los yog argon. Txhua cov pa oxygen tam sim no thaum kub-kub homogenization yuav ua rau oxidation loj heev thiab depletion ntawm tseem ceeb alloying ntsiab xws li chromium. Koj tsis yog scaling saum npoo; koj tab tom hloov lub metallurgy ntawm daim tawv nqaij. Peb kawm qhov no tom qab ib pawg tuaj tawm ntawm lub qhov cub tsis zoo nrog lub ntsej muag grey npub. Machining qhia pitting. Lub tshuab hluav taws xob foob tau raug cuam tshuam. Tam sim no, peb ua tim khawv daim coupon nrog txhua qhov kev thauj khoom kom paub tseeb tias qhov chaw huv si.
Machining thiab zaum kawg Hurdle
Qhov no yog qhov twg QSY's integrated qauv ntawm peev casting thiab CNC machining qhia nws tus nqi. Machining cam khwb cia 718 yog ib yam tsiaj sib txawv dua li machining nws wrought counterpart. Lub hardness tuaj yeem tsis sib haum, thiab zais micro-shrinkage lossis suav nrog tuaj yeem rhuav tshem $ 200 kawg zeb hauv ib qho tam sim.
Tus yuam sij yog ruaj khov, nruj kev teeb tsa thiab kev txiav txim siab zoo. Koj tsis mus rau high-speed machining ntawm no. Nws yog hais txog qeeb thiab khov kho, nrog copious coolant los tswj cov cua sov thiab tiv thaiv kev ua haujlwm hardening ntawm qhov chaw. Cov cuab yeej geometry yog qhov tseem ceeb-zoo rake, ntse npoo. Cov cuab yeej npub tsuas yog smear cov khoom thiab ua kom muaj cua sov ntau dhau.
Qhov tseem ceeb tshaj plaws, cov txheej txheem machining yuav tsum tau npaj nrog cov casting qhov seem nyob hauv siab. Tej zaum koj yuav xav tau ntxhib, tom qab ntawd txo kev ntxhov siab, tom qab ntawd ua tiav tshuab. Yog tias koj sim coj nws tag nrho hauv ib qho mus, ib feem tuaj yeem ua rau muaj kev cuam tshuam loj heev tom qab nws tsis muaj kev cuam tshuam, ua rau nws tsis muaj txiaj ntsig. Nws yog qhov kawg, ceev faj kev sib tham los nthuav tawm ib qho zoo meej ntawm qhov ntxhib, scaled casting.
Yog li, Tus Nqi Tiag Tiag yog dab tsi?
Thaum koj ntsuas tus neeg xa khoom rau peev casting inconel 718, koj tsis yog yuav phaus hlau xwb. Koj tab tom yuav lawv cov txheej txheem tswj keeb kwm, lawv qhov kev nkag siab ntawm metallurgical, thiab lawv cov teeb meem daws teeb meem hauv lub cim xeeb. Cov nqe lus pheej yig feem ntau yog los ntawm lub khw uas kho nws zoo li stainless hlau. Lawv yuav xa ib feem uas zoo li tab sis ua tsis tiav hauv kev sim lossis hauv thaj chaw.
Tus nqi ntawm tus neeg teb xov tooj tsim yog nyob rau hauv kev zam cov kev puas tsuaj, kev pab cuam ncua sij hawm tsis ua haujlwm. Nws yog nyob rau hauv kev paub hais tias ib tug tej lub rooj vag tsim ua hauj lwm rau qhov tshwj xeeb bracket geometry, los yog hais tias ib tug ntau yam ntawm ceramic hmoov xav tau ib tug tweak nyob rau hauv lub slurry viscosity rau 718. Qhov no tsis yog cov khoom tsim. Nws yog zoo li bespoke metallurgy. Tus nqi tiag tiag yog kev lees paub tias feem yuav ua raws li cov xwm txheej hauv daim ntawv spec thiaj li tso siab tau piav qhia. Thiab qhov kev lees paub ntawd yog tsim los ntawm lub hauv paus ntawm kev ua yuam kev yav dhau los, cov kev kawm tau kawm, thiab nyuaj-yeej, kev txawj ntse hauv khw.
