Thaum koj hnov 'precision peev casting tuam txhab', dab tsi los rau hauv siab? Tej zaum yog daim ntawv qhia huv nrog cov khoom ci ntsa iab thiab kev thov ntawm micron-theem raug. Qhov kev muaj tiag, kev sib tsoo txhua hnub, yog deb messier thiab nthuav ntau dua. Qhov tseeb tiag tsis yog nyob rau hauv daim ntawv spec; nws yog embedded nyob rau hauv lub sau grit ntawm tuav ciab qauv nyob rau hauv ib tug ntub hnub, nyob rau hauv kev txiav txim hu rau lub plhaub thickness rau ib tug nyias-walled turbine hniav, thiab nyob rau hauv lub ntsiag to ntshai ntawm ib tug thawj-kab tshuaj ntsuam xyuas. Ntau lub khw muag cov npau suav ntawm 'cov duab geometries' tab sis stumble ntawm cov hauv paus ntsiab lus - kev tsim cov rooj vag sib xws, kev tswj xyuas thermal thaum lub sij hawm dewaxing, los yog tsuas yog ua tiav qhov zoo ntawm qhov chaw tiav ntawm 17-4 PH stainless yam tsis siv rau kev siv ntau dhau. Qhov ntawd yog qhov uas kab tau kos.
Lub Foundation: Nws yog Txhua Yam Txog Cov Txheej Txheem Txheej Txheem
Koj tsis tuaj yeem hais lus precision yam tsis tau txiav cov saw, txuas los ntawm qhov txuas. Nws pib nrog pwm rau cov qauv siv quav ciab. Yog tias qhov ntawd tawm, txhua yam uas tom qab tsuas yog cov khoom kim heev. Kuv tau pom cov khw lag luam nchuav nyiaj rau hauv kev zoo nkauj 5-axis CNC rau cov cuab yeej siv quav ciab tab sis tsis saib xyuas cov kab cua txias tsim, ua rau cov qauv warpage uas tsuas yog tshwm sim tom qab lub plhaub ceramic tau tsim. Lub plhaub nws tus kheej yog ib qho kev kos duab-txhua daim ntawv thov thiab stucco tsis yog ib kauj ruam xwb; nws yog ib tug thermal barrier yog tsim. Ntau cov khaubncaws sab nraud povtseg, thiab koj yuav raug lub plhaub tawg thaum lub sijhawm kub kub kub tawm; tsawg dhau, thiab koj tau txais kev tawg, npau suav ntawm tus kheej qhov twg cov hlau molten ntsib cov xuab zeb hauv pem teb. Qhov kev xaiv ntawm binder, zircon vs. fused silica hmoov rau lub ntsej muag lub tsho ... cov no tsis yog kev xaiv catalog. Lawv yog cov kev txiav txim siab raws li cov alloy raug nchuav. Pouring superalloys zoo li Inconel 718? Koj xav tau lub tsho tiv no thawj zaug kom tsis txhob muaj tshuaj lom neeg los tiv thaiv qhov tshwm sim ntawm qhov chaw. Ib lub tuam txhab uas tau txais qhov no, zoo li QSY (Qingdao Qiangsenyuan Technology), nrog rau lawv 30 xyoo, koj tuaj yeem bet lawv cov txheej txheem cov ntaub ntawv muaj cov ntsiab lus hammered tawm los ntawm kev sim thiab, yog, yuam kev.
Tom qab ntawd muaj cov yaj thiab ncuav. 'Precision' ntawm no zoo nkaus li yuav luag zoo li lub npe tsis raug. Nws yog tswj chaos. Koj nyob nraum ntsuas qhov kub ntawm lub cub tawg, cov hlau fluidity, thiab yuav tsum tau sau cov pwm kom tiav ua ntej txhua seem solidifies. Rau cov ntu nyias, qee zaum koj yuav tsum tau preheat lub plhaub, ua haujlwm me me uas yog overdone, tsis muaj zog. Peb kawm qhov no txoj kev nyuaj ntawm kev khiav ntawm cov tsev nyob sensor. Cov geometry muaj cov kab ntev ntev no. Thawj ob peb ncuav, txias plhaub, misruns. Peb preheated, tab sis tau overzealous, thiab lub plhaub tawg thaum tuav. Qhov kho tsis nyob hauv phau ntawv; nws yog ib qho qeeb qeeb, staged preheat thiab tweak rau lub rooj vag kom ua tau zoo dua thermal dab dej. Qhov ntawd yog hom precision peev casting nthuav dav koj tsuas yog tau los ntawm kev rov ua dua.
Kev ua tiav yog qhov uas cov lus cog tseg tau pom los yog ploj lawm. Qhov no yog qhov uas ntau tus neeg thov 'net-shaped' tab sis ntsiag to pob nyiaj siv rau hnyav machining. Muaj tseeb precision casting minimizes Tshuag pub nyiaj. Nws txhais tau tias koj cov ntsiab lus txiav tawm yog npaj los ntawm theem tsim, koj lub rooj vag tau muab tso rau tsis yog rau kev khiav, tab sis kom yooj yim tshem tawm yam tsis muaj kev puas tsuaj. Ib qho zoo precision peev casting tuam txhab yuav muaj nws CNC machining nyob rau hauv-tsev, tsis yog raws li ib tug add-on, tab sis raws li ib tug integrated kauj ruam kawg. Vim li cas? Vim tias tib pab pawg uas nrum qhov nkag siab txog qhov tob ntawm daim tawv nqaij, lub peev xwm rau cov kev ntxhov siab uas seem, thiab cov ntsiab lus tseeb ntawm datum. Thaum kuv saib QSY qhov teeb tsa, qhov tseeb lawv sau peev casting thiab CNC machining li co-specializations tsis yog kev muag khoom; nws yog ib tug logic workflow. Koj nrum lub cev lub cev ua haujlwm hauv duplex stainless hlau, thiab koj tshuab lub ntsej muag sib khi hauv tib lub chaw, nyob rau hauv tib lub kaus zoo. Lub voj kev tawm tswv yim yog nruj.
Cov ntaub ntawv: Qhov twg Theory ntsib lub Crucible
Carbon steel, 316L, cam khwb cia hlau - cov no yog cov qhob cij thiab butter. Tab sis qhov kev sim tiag tiag ntawm lub hauv paus ntawm lub mettle yog nyob rau hauv cov kab txawv alloys. Nickel-based thiab cobalt-based superalloys yog cov tsiaj nyaum sib txawv. Lawv tsis yog 'nyuaj rau tshuab'; lawv tag nrho cov kev coj cwj pwm hloov pauv. Lawv muaj qhov nqaim solidification ranges, yog qhov ua rau kub kub tearing, thiab tuaj yeem ua pa nrog oxygen lossis nitrogen yog tias lub ncuav tsis tswj tau. Kuv nco txog ib qhov project uas muaj cobalt-chrome tivthaiv rau kev cog hniav. Qhov kev xav tau ntawm bio-compatibility yog qhov tseem ceeb, txhais tau tias xoom qhov chaw paug. Cov txheej txheem plhaub tsis tau txiav nws; peb yuav tsum tau hloov mus rau lub ntsej muag tshwj xeeb alumina-based. Tus nqi tawm los yog lim hiam rau thawj lub hlis. Qhov no yog qhov kev paub, lossis qhov tsis muaj, tau txais kev phem heev. A precision peev casting tuam txhab uas casually teev 'tshwj xeeb alloys' ntawm nws lub vev xaib zoo dua muaj cov cav hlau metallurgical thiab cov khoom seem los ua pov thawj tias lawv tau ua haujlwm tom tsev.
Nws tsis yog hais txog nchuav lawv xwb. Nws yog hais txog kev kho cua sov. Ntau yam ntawm cov alloys no tau txais lawv cov khoom - lawv lub zog tensile, corrosion kuj - los ntawm cov txheej txheem tom qab-casting tshav kub. Yog tias koj qhov chaw tsim khoom tsuas yog cam khwb cia thiab nkoj, lawv tab tom xa tawm lub sijhawm foob pob. Ib feem yuav dhau qhov kev tshuaj xyuas thawj zaug tab sis ua tsis tiav hauv kev pabcuam vim tias lub microstructure tsis ruaj khov. Kev sib koom ua ke ntawm foundry thiab metallurgy yog non-negotiable rau precision ua hauj lwm. Koj yuav tsum tswj cov dab neeg los ntawm cov kua mus rau qhov kawg.
Qhov no coj kuv mus rau qhov ua tau zoo: cov khoom siv traceability. Nws suab bureaucratic, tab sis nws yog lub hauv paus ntawm kev ntseeg. Rau txhua yam tseem ceeb, koj yuav tsum paub cov cua sov ntawm tus tswv alloy, cov ntaub ntawv qhia txog chemistry, thiab lub plhaub twg uas nws tau nchuav rau hauv. Thaum muaj teeb meem tshwm sim rau lub hlis tom qab, cov ntaub ntawv no tsim nyog nws qhov hnyav hauv kub. Nws hloov qhov kev ua si liam rau hauv qhov teeb meem engineering daws tau. Kev ua haujlwm tshaj lij yuav muaj cov kab ke no, tsis yog kev xav tom qab rau cov neeg siv khoom siv dav hlau, tab sis raws li kev coj ua.
Tib neeg qhov tseem ceeb: ntsuas, qhov muag, thiab lub plab xav
Tsis muaj ntau npaum li cas ntawm automation hloov lub caij nyoog qhov muag. Kuv mam li hais. Ib tus txheej txheem zoo engineer tuaj yeem taug kev dhau ntawm cov khib nyiab ntawm cov plhaub ziab thiab pom ib qho uas muaj peev xwm laminar tsis xws luag los ntawm qhov sheen, los yog tsis muaj. Qhov 'precision' hauv peev casting feem ntau raug kaw hauv cov kev kuaj xyuas zoo. Thawj-kab tshuaj ntsuam xyuas yog kev cai dab qhuas. Koj tsis tsuas yog txheeb xyuas qhov ntev nrog CMM; koj tab tom saib cov qauv nplej nyob rau hauv lub microscope, kuaj xyuas micro-porosity nrog kev ntsuas nkag mus, ntsuas qhov ua tiav saum npoo tiv thaiv lub cev sib piv. Nws puas xav tias yog? Qhov kev xav no yog tsim los ntawm kev pom ntau txhiab qhov, qhov zoo thiab qhov tsis zoo.
Kev cob qhia qhov muag no yuav siv sij hawm-xyoo. Tias yog vim li cas 30-xyoo keeb kwm ntawm ib lub tuam txhab zoo li QSY tsis yog ib txoj kab kev lag luam xwb; nws sawv cev rau lub koom haum nco. Nws txhais tau hais tias muaj cov neeg nyob hauv pem teb uas nco qab thaum zoo li geometry ua tsis tiav xyoo 2005 thiab lawv kho nws li cas. Qhov kev paub ntawd tsis yog ib txwm sau zoo kawg nkaus hauv SOP; nws tau dhau mus thaum lub sijhawm hloov pauv thiab kev daws teeb meem huddles. Cov txheej txheem tib neeg no yog kev tswj hwm qhov zoo tshaj plaws, ntes cov khoom uas tus programmed scanner yuav nco.
Tab sis nws yog ob-edged ntaj. Kev cia siab rau 'pab pawg neeg paub' tuaj yeem yog qhov tsis muaj zog yog tias tsis txhawb nqa los ntawm cov ntaub ntawv. Cov khw zoo tshaj plaws uas kuv tau ua haujlwm nrog ua ke ob. Tus neeg ua haujlwm qub tub rog xav tias cov tshuaj siv quav ciab khiav txias; lawv xyuas nws tawm tsam cov keeb kwm siab / qhov kub thiab txias rau cov pwm ntawd. Cov ntaub ntawv lees paub lub plab, thiab kho kom raug. Qhov kev sib koom ua ke no yog qhov tsim kom muaj zog, rov ua dua precision peev casting txheej txheem, tsis yog muaj hmoo batch xwb.
Thaum Precision Fail: Kawm los ntawm cov khoom seem
Leej twg tsis tau ua ib yam dab tsi. Qhov tseem ceeb yog qhov koj ua nrog nws. Thaum ntxov ntawm kuv lub sijhawm, peb muaj kev txiav txim siab tshaj plaws rau cov khoom siv marine impellers hauv bronze. Cov qauv tsim yog ambition - nyias, nkhaus vanes. Thawj qhov kev tsim khoom ua haujlwm, 70% tsis ua haujlwm tus nqi los ntawm mistruns thiab txias kaw. Cov tshuaj tiv thaiv tam sim no yog los liam cov hlau kub. Peb tsa nws. Ntau qhov ua tsis tiav, tam sim no nrog shrinkage porosity. Peb tau caum cov tsos mob.
Qhov teeb meem tiag tiag, uncovered tom qab ib lub lim tiam ntawm kev ntxhov siab, yog ob zaug. Ua ntej, lub rooj sib txoos siv quav ciab ('ntoo') yog tuab heev, ua rau lub plhaub txias heev hauv qhov chaw thaum hlawv. Qhov thib ob, lub rooj vag tsis txaus los pub cov khoom nyias nyias. Peb yuav tsum rov qab mus rau cov qauv siv quav ciab, ua kom lub qhov rooj loj tuaj, thiab qhov chaw cov qauv sib txawv ntawm tsob ntoo. Nws raug nqi peb lub sijhawm thiab nyiaj txiag, tab sis qhov ua tsis tiav tau qhia kuv ntau ntxiv txog thermal huab hwm coj thiab noj ntau dua li phau ntawv. Ua kom pom tseeb zoo precision peev casting tuam txhab yuav muaj cov txheej txheem formalized tsis raws cai uas yuam cov hom kev soj ntsuam hauv paus, tsis yog kev kho sai rau nkoj qhov kev txiav txim.
Lwm qhov teeb meem tshwm sim yog kev sib txuas lus tsis ua haujlwm nrog tus tsim qauv. Cov kws tsim qauv tsim rau machining feem ntau tsis nkag siab cov kaum sab xis, lub ntuj shrinkage, los yog xav tau cov phab ntsa tuab tuab rau casting. Nws yog lub foundry txoj hauj lwm los sab laj, hais tias, Peb tuaj yeem nrum qhov ntawd, tab sis yog tias koj tso cai rau 0.5 hli vojvoog ntawm no es tsis txhob siv lub kaum ntse ntse, koj cov txiaj ntsig thiab cov nqi yuav zoo dua. Lub tswv yim tsim-rau-manufacturability (DFM) no yog ib qho kev pabcuam tseem ceeb. Tsis yog hais tias tsis yog; nws yog hais txog kev sib koom tes los ua kom qhov castable thiab meej. Saib ntawm cov ntaub ntawv los ntawm ib tus neeg ua si tsim, koj tuaj yeem pom qhov hloov pauv no hauv lawv cov ntaub ntawv tshawb fawb-cov qauv tsim los ua tus phooj ywg zoo dua nyob rau lub sijhawm, ib qho kev qhia ntawm kev sib koom tes tiag tiag, tsis yog tus neeg txiav txim xwb.
Cov qauv sib xyaw ua ke: Casting raws li cov khoom, Tsis yog qhov kawg
Qhov no yog qhov chaw lag luam tab tom mus, lossis qhov twg cov neeg ua tiav tau zoo lawm. Precision peev casting tsis tshua muaj cov kauj ruam kawg. Ib feem xav tau machining, tej zaum vuam, kho cua sov, txheej txheej. Muaj cov peev txheej no nyob rau hauv ib lub ru tsev, lossis hauv kev sib koom ua ke nruj, hloov txhua yam. Nws txo cov sij hawm txhuas, ua kom zoo txuas ntxiv, thiab ua kom yooj yim logistics. Thaum cov pab pawg casting thiab machining nyob rau hauv tib lub tsev, lawv tuaj yeem zaum nrog ib feem thiab kos duab. Tus kws kho tshuab tuaj yeem taw qhia qhov twg me ntsis hloov ntawm cov tub ntxhais casting yuav ua rau lawv zoo dua datum. Tus engineer foundry tuaj yeem piav qhia vim li cas qee qhov chaw muaj qhov siab dua me ntsis li-cast roughness.
Qhov no yog cov qauv uas ua rau kev nkag siab zoo rau cov khoom sib txuam, muaj txiaj ntsig zoo. Koj pom nws hauv kev ua haujlwm uas ua haujlwm rau kev xav tau xws li lub zog, aerospace, thiab kev kho mob. Nws tsis yog hais txog kev muaj lub tshuab CNC; nws yog hais txog cov txheej txheem kev koom ua ke. Piv txwv li, ib lub tuam txhab muab cov kev daws teeb meem tag nrho los ntawm kev ua kom tiav cov tshuab ua tiav, zoo li cov kev pabcuam cuam tshuam los ntawm QSY cov khoom sib xyaw ua ke, tuaj yeem tswj tau tag nrho cov nqi saw. Qhov no tshem tawm cov ntiv tes taw uas tshwm sim thaum lub casting raug tsis lees paub ntawm lub khw muag khoom sib cais. Lub luag haujlwm yog qhov tseeb.
Thaum kawg, daim ntawv lo 'precision peev casting tuam txhab' yog khwv tau, tsis thov. Nws tau txais nyob rau hauv qhov sib xws ntawm batch 100 matching batch 1. Nws tau txais los ntawm kev muaj peev xwm ua haujlwm tsis yog cov haujlwm ncaj ncees xwb tab sis qhov ze-tsis muaj peev xwm sawv daws yuav, cov uas xav tau cov khoom siv science, txheej txheem engineering, thiab kev sib koom tes ntawm kev txawj ntse. Nws yog nyob rau hauv cov ntsiab lus: kev saib xyuas cov cav rau lub autoclave, calibration stickers ntawm lub micrometers, lub koom haum tab sis zoo-siv saib ntawm lub zoo lab. Qhov tseeb yog nyob rau hauv qhov system, thiab lub kaw lus yog tsim los ntawm cov neeg uas tau pom dab tsi tshwm sim thaum nws tawg. Qhov ntawd yog zaj dab neeg tiag tiag, nyob deb ntawm daim ntawv ci ntsa iab.
