Cia peb txiav los ntawm kev lag luam hais lus. Thaum cov neeg feem coob hnov 'precision casting', lawv daim duab flawless, net-shaped seem popping tawm ntawm pwm, npaj mus. Qhov tseeb yog messier, ntau nuanced, thiab frankly, nthuav ntau. Nws tsis yog ib qho txheej txheem xwb; nws yog ib qho kev sib tham tas mus li ntawm kev xav tsim, kev coj tus cwj pwm, thiab qhov tseeb ntawm physics thiab chemistry. Ntau cov specs tau muab pov tseg ib puag ncig yam tsis nkag siab qhov lawv raug nqi tiag tiag kom ua tiav hauv pem teb.
Lub Plhaub Game: Nws yog ntau tshaj li Xuab zeb
Plhaub pwm casting, ib qho ntawm peb txoj hauv kev tseem ceeb, feem ntau tau lumped nrog cov xuab zeb yooj yim dua. Qhov ntawd yog qhov yuam kev. Lub precision pib nrog pwm nws tus kheej. Peb tsis yog tsuas yog ntim cov xuab zeb nyob ib ncig ntawm tus qauv; peb tab tom tsim ib lub plhaub nyias, nruj los ntawm ntau cov txheej txheem stucco. Qhov sib xws ntawm cov ceramic slurry, cov qoob loo loj ntawm refractory stucco, lub sij hawm ziab ntawm dips-txhua qhov sib txawv whispers mus rau qhov kawg nto tiav. Tau ib qho tsis ncaj ncees lawm, thiab koj yuav pom nws nyob rau hauv qhov kawg, los yog phem dua, nyob rau hauv lub plhaub tawg thaum lub sij hawm nchuav. Kuv tau pom cov haujlwm uas tus neeg siv khoom xav tau Ra 3.2 μm nto tiav raws li-cam khwb cia. Ua tau? Yog, nrog lub plhaub. Tab sis nws txhais tau tias tweaking thawj lub tsho tiv no slurry viscosity thiab tsiv mus rau ib tug finer zircon xuab zeb rau lub ntsej muag lub tsho, uas ntxiv tus nqi thiab ilv tuav yuav tsum. Nws yog cov kev lag luam tawm uas txhais tau tias muaj tseeb tiag.
Qhov kev sim tiag tiag los nrog cov geometry nyuaj. Nyias phab ntsa, internal channels, undercuts. Nrog lub plhaub molding, peb tuaj yeem ua tiav cov seem mus txog 3 hli txhim khu kev qha, tab sis thawb mus rau 2 hli? Qhov ntawd yog qhov uas cov kos duab tuaj rau hauv. Nws yuav tsum tau tsim qauv zoo meej (cov duab kos duab tsis yog sib tham), thiab kev tswj hwm, nrawm dua los sau cov kab noj hniav ua ntej cov hlau pib khov rau hauv cov khoom me me. Peb poob ib pawg ib zaug ntawm lub twj tso kua mis impeller qauv - qauv zoo nkauj, tab sis cov ntawv luam tawm tseem me me. Thaum lub sij hawm pouring, lub buoyancy ntawm molten stainless hlau ua tau lifted cov tub ntxhais, misaligning lub sab hauv passages. Ib qho chaw ntsiag to, kim tsis ua haujlwm uas tau qhia peb kom dhau-engineer core anchoring rau dynamic pours.
Thiab tom qab ntawd muaj qhov txwv ntawm cov khoom siv. Plhaub pwm muaj kev ruaj ntseg zoo heev rau cov hlau cam khwb cia hlau, carbon steels, qib stainless hlau. Tab sis thaum koj dhia mus rau superalloys nrog rau qhov kub thiab txias sab qaum teb ntawm 1500 ° C, lub thermal shock ntawm lub plhaub yog lim hiam. Peb hloov mus rau fused silica-raws li lub ntsej muag lub ntsej muag rau ib tug series ntawm Nickel-raws li alloys Cheebtsam, uas tau pab, tab sis nws tau qhia txog qhov teeb meem tshiab: lub plhaub tau dhau los ua nkig. Cov txheej txheem tuav los ntawm dewaxing mus rau pouring yuav tsum tau rov xav tag nrho. Tsis muaj phau ntawv qhia txog qhov ntawd; nws yog haiv neeg paub hauv pem teb.
Kev nqis peev Casting: Lub Poob Wax Reality Check
Kev nqis peev casting yog tus menyuam daim ntawv tshaj tawm rau qhov tseeb, thiab rau qhov laj thawj zoo. Lub wax qauv replication yog qhov chaw fidelity yug. Tab sis lo lus 'poob ciab' suab yuav luag tej yam yees siv, thiab nws obscures lub sheer tus naj npawb ntawm cov kauj ruam uas kam rau siab tuaj yeem los ntshav. Kev txhaj tshuaj wax tsis-kub, siab, tuav lub sijhawm-tshwj xeeb cuam tshuam rau cov qauv qhov ntev thiab qhov zoo. Ib qho qauv uas zoo li zoo meej tuaj yeem txo qhov sib txawv thaum lub sij hawm kev nqis peev, pov tawm qhov tseem ceeb.
Peb siv nws hnyav rau qhov chaw uas yuav tsis yooj yim rau tshuab kev lag luam-xav tias kev sib xyaw ua ke turbine hniav nrog cov cua txias sab hauv, lossis kev kho mob cog cov qauv nrog cov duab organic. Qhov tseeb qhov tseeb yog qhov zoo heev, feem ntau tuav +/- 0.005 ntiv tes ib nti. Tab sis qhov ntawd yog nyob rau hauv cov xwm txheej zoo. Ib zaj lus qhia nyuaj-kawm: ambient humidity nyob rau hnub koj tsim lub plhaub ceramic tseem ceeb. siab dhau lawm, thiab cov khaubncaws sab nraud povtseg tsis qhuav thiab sinter kom zoo; lub plhaub tuaj yeem tsis muaj zog. Tsawg dhau, thiab cov khaubncaws sab nraud povtseg tuaj yeem kho sai heev, ua rau muaj kev ntxhov siab. Tam sim no peb muaj kev tswj hwm huab cua hauv lub plhaub-tsev chav tsev, ib qho kev siv nyiaj tsis sib tham uas tau them rau nws tus kheej hauv cov khoom seem.
Cov txheej txheem dewaxing yog lwm qhov tseem ceeb juncture. Autoclave vs. flash hluav taws? Txhua tus muaj qhov zoo. Rau cov qauv loj nrog cov ntu tuab, peb xav kom tswj tau lub voj voog autoclave kom yaj cov quav ciab tawm yam tsis tau tawg lub plhaub ntsuab. Tab sis rau cov khoom me me, nyias-walled, thermal shock ntawm hluav taws kub tuaj yeem hnyav dhau. Peb tawg tag nrho tsob ntoo ntawm aerospace brackets ib zaug los ntawm kev txhoj puab heev nrog lub siab autoclave. Cov ciab tsis ntws nrawm txaus, nthuav dav, thiab… pop. Lub ntsiag to, ceramic crunch uas txhais tau tias lub lis piam ntawm lub sij hawm ploj. Tam sim no, rau txhua qhov kev sib sau ua ke tshiab, peb khiav lub plhaub me me kom hu rau hauv qhov dewaxing tsis. Nws qeeb, tab sis nws txuag.
Khoom siv tsis yog ib daim ntawv tshwj xeeb xwb
Cov neeg siv khoom xa cov khoom tshwj xeeb: ASTM A351 CF8M lossis Inconel 718. Qhov ntawd yog qhov pib ntawm kev sib tham, tsis yog qhov kawg. Txhua alloy coj zoo li ib yam khoom muaj sia nyob hauv lub crucible thiab pwm. Noj stainless hlau. Cov chromium xav kom oxidize, tsim cov slag uas tuaj yeem raug daig hauv qhov casting yog tias lub rooj vag tsis tsim los kom cov dej ntws tawm thiab raug huab cua. Peb siv cov kev sib tw khiav thiab cov ntxaij lim dej ceramic raws li tus qauv tam sim no, tab sis nws tau siv ob peb pawg nrog qhov tsis zoo saum npoo suav nrog los ua txoj cai ntawd.
Cobalt-based alloys yog ib tug tsiaj nyaum ntawm lawv tus kheej. Zoo heev hnav thiab corrosion kuj, txaus ntshai fluidity. Lawv tau mushy sai, yog li sau cov seem nyias yog ib haiv neeg. Peb feem ntau yuav tsum superheat lawv ntau tshaj li daim ntawv qhia tshwj xeeb pom zoo, uas ua rau muaj kev pheej hmoo ntawm cov qoob loo loj hlob thiab nag lossis daus carbide. Txoj kev daws teeb meem? Faster pouring los ntawm rhuab troughs thiab tej zaum kuj pre-heating pwm. Nws ntxiv qhov nyuaj, tab sis nws yog tib txoj hauv kev kom tau txais kev ua tiav ntawm lub rooj zaum valve, piv txwv li. Koj tsis tuaj yeem nchuav cov no zoo li koj nchuav cam khwb cia hlau.
Thiab tom qab ntawd muaj qhov kev muaj tiag tom qab-casting. Ntau tus xav tias qhov precision-casting tiav lawm. Hardly. Yuav luag txhua yam mus rau peb lub tuam txhab CNC. Lub casting muab qhov ze-net zoo, tab sis lub machining muab qhov kawg, kev ua haujlwm precision-cov xov, sealing nto, nruj-tolerance bores. Qhov no yog qhov kev sib koom ua ke ntawm qhov chaw zoo li Qingdao Qiangsenyuan Technology Co., Ltd. (QSY) ua rau siab. Muaj casting thiab machining nyob rau hauv ib lub ru tsev txhais tau hais tias pab pawg machining tuaj yeem rov qab mus rau qhov chaw tsim khoom: Tus thawj coj no ib txwm 0.5mm tuab heev, tawm hauv cov khoom lag luam ntau dhau rau peb tshem tawm, los yog qhov zoo li-cam khwb cia nyob rau hauv lub hnab tshos no zoo heev peb tuaj yeem hla dhau qhov roughing dhau. Qhov kev tawm tswv yim lub voj voog, ua rau lawv 30 xyoo, yog qhov tseeb qhov sib xws yog forged.
CNC: Tus khub, Tsis yog Tus Neeg Ua Haujlwm Huv Huv
Hais txog CNC, nws tsis yog tom qab; nws yog ib feem tseem ceeb ntawm qhov kev sib npaug precision. Cov ntsiab lus datum tsim los ntawm cov qauv casting yuav tsum tau tsim nrog lub machining fixture hauv siab. Peb tau tsiv mus rau 3D-printed fixture prototypes los sim no interface ua ntej txiav hlau. Ib qho zoo nkauj cam khwb cia yog tsis muaj txiaj ntsig yog tias nws tsis tuaj yeem tuav ruaj ntseg rau machining yam tsis muaj kev cuam tshuam.
Rau cov ntaub ntawv zoo li duplex stainless hlau los yog cov cuab yeej hardened, cov machining tsis tom qab casting yog qhov tseem ceeb. Kev kho cua sov los ntawm cov txheej txheem casting cuam tshuam lub machinability. Peb feem ntau ua qhov muag muag ua ntej machining, tom qab ntawd qhov kev kho cua sov zaum kawg rau spec, ua raws li lub teeb tiav. Nws yog peb-kauj ruam ua las voos nruab nrab ntawm lub cub tawg thiab lub tshuab nruab nrab. Sim ua tshuab ib yam li-cam khwb cia, hardened hlau tivthaiv yog ib txoj hauv kev zoo rau hlawv cov ntxig thiab qhia kev ntxhov siab rau hauv ib feem.
Tus nqi tiag tiag-ntxiv yog nyob rau hauv machining cov un-machinable cam khwb cia duab. Tsis ntev los no peb muaj ib tug manifold nrog intersecting nyob rau hauv cov nqe lus uas yuav tsis yooj yim sua rau xyaum. Los ntawm peev casting, peb tsim cov nqe lus. Tom qab ntawd, siv kev sib xyaw ua ke ntawm 5-axis CNC thiab EDM, peb tsim cov flanges thiab cov chaw nres nkoj sib txuas nrog kev sib raug zoo rau cov ntawv pov thawj. Lub casting enabled complexity; lub CNC enabled lub interface rau lub ntiaj teb tiag.
Failure yog Data Point
Koj tsis tau txais qhov zoo ntawm qhov tsis muaj qhov tawg. Ntau yam. Lub hom phiaj tsis yog kom tsis txhob ua tsis tiav, tab sis ua kom nws tshwm sim hauv kev tswj hwm, kev qhia paub. Peb khiav thawj tsab xov xwm tshuaj xyuas uas yog ciam teb puas tsuaj-txiav cov qauv castings los ntsuas cov phab ntsa sab hauv, kuaj xyuas cov micro-porosity nrog dye penetrant rau ntawm qhov chaw tsis tseem ceeb, ua cov kev sim khoov ntawm cov khoom sib tw pov tseg.
Ib qho teeb meem tsis tu ncua yog micro-shrinkage hauv cov ntu hnyav uas nyob ib sab ntawm cov phab ntsa nyias. Cov tshuaj tsis nyob hauv pwm; nws yog nyob rau hauv lub riser tsim thiab siv exothermic padding los tswj lub solidification gradient. Peb kawm tau tias los ntawm lub tsev twj tso kua mis ua tsis tau. Qhov kev sim siab dhau lawm, tab sis X-ray qhia qhov chaw spongy uas yuav ua tsis tiav hauv kev qaug zog. Qhov ntawd ua rau kev tshuaj xyuas tus qauv ntawm peb lub caj dab feeder tsim rau cov geometry zoo sib xws.
Thaum kawg, precision casting yog hais txog kev tswj thiab kev kwv yees. Nws yog hais txog kev paub tias yog tias koj ua raws li cov txheej txheem tshwj xeeb cocktail-qhov no wax blend, daim ntawv qhia plhaub, qhov ntsuas kub rau cov hlau ntawd, qhov kev ua haujlwm ua ntu zus-koj yuav tau txais ib feem hauv lub hnab ntawv uas muaj kev hloov pauv. Nws yeej tsis zoo tag nrho, tab sis nws ntseeg tau zoo heev. Thiab qhov kev ntseeg siab ntawd, yug los ntawm peb lub xyoo caum ntawm kev daws teeb meem zoo li cov saum toj no, yog qhov cais ib feem uas ua haujlwm ntawm ib feem uas kav ntev. Cov tuam txhab uas dhau los, zoo li QSY, nkag siab nws qhov tob, qee zaum ntxhov, txheej txheem kev paub tias koj tab tom yuav tiag tiag, tsis yog CAD cov ntaub ntawv hloov mus rau hlau.
