Los Ntawm Kev Sib Tsoo Kom Tiav: Kev Kho Tom Qab Kev Kho Mob Rau Lub Chaw Ua Khoom Ntxiv Ntxiv

3D-luam tawm hlau qhov chaw muaj qhov ua haujlwm qis tom qab kawg thiab kev sib tsoo muaj qhov zoo txaus los ua kom muaj kev daws teeb meem zoo rau kev zam thaum kawg.

Cov kev siv dav ntxiv ntawm kev tsim hluav taws xob hauv kev lag luam aerospace thiab kev kho mob tau ua rau muaj qhov xav tau ntau ntxiv nyob rau ntawm cov chaw ntxiv cov tshuaj ntxiv kom ua tau raws li qhov xav tau ntawm qhov kawg siv. Cov txheej txheem kev tsim khoom ntxiv ua cov khoom sib luag ze rau cov qauv zoo kawg, txo qhov kev xav tau ntawm qhov kawg tiav. Los ntawm kev tsim cov khoom lag luam ntxiv, cov khoom siv pov tseg cov khoom siv tuaj yeem txo los pab txhawb kev ua haujlwm tag nrho, tab sis qhov no kuj txhais tau tias tom ntej ua tiav cov txheej txheem xav tau ntau cov kev ua kom rov ua dua li qub thiab sib xws. Yog li, nws yog qhov tseem ceeb kom ntseeg tau tias muaj kev sib txuam tom qab kev kho mob kom tau raws li cov khoom sib haum thiab cov khoom zoo dua qub. Kev sib tsoo tuaj yeem yog lwm qhov kev xaiv zoo rau kev tsim cov quav hauv kev siv uas qhov chaw tiv thaiv thiab thaj chaw muaj ntau qhov xav tau. Kev sib tsoo tawm tau qhov chaw zoo dua qub thiab muaj qhov ncaj ncees dua li lwm cov txheej txheem ntawm cov khoom sib cais. Txhawm rau kawm paub ntau ntxiv txog qhov kawg ntawm kev tsim cov khoom lag luam ntxiv, tshwj xeeb tshaj yog thaum thov rau nickel-based high-temperature alloy Cheebtsam hauv kev lag luam aerospace, Norton. Saint-Gobain engineers tau txhim kho Inconel 718 tus qauv ua los ntawm kev ntxiv dej. Txoj kev tshawb no tsom rau peb lo lus nug: Qhov tsawg kawg nkaus / cov khoom ntim tsawg kawg uas yuav tsum tau hnav los ntawm cov khoom siv ua los ntawm cov khoom ntxiv yog dab tsi? Dab tsi saum npoo tuaj yeem ua tiav los ntawm kev sib tsoo cov khoom siv tau ua los ntawm kev tsim kho uas siv lub cim tshiab ntawm kev sib tsoo lub log? Thib peb, dab tsi yog qhov zoo ntawm kev sib tsoo zoo ntawm cov khoom seem saum npoo tawg (yog tias muaj) ntawm qhov cuab lub zog ntxiv?

Cov qauv ntawm AM IN718 tsim ua los siv cov khoom siv ncaj qha hlau Laser Sintering (DMLS) cov txheej txheem yog muab los ntawm Stratasys Direct Manufacturing. Daim duab 1 qhia txog kev sim ua qauv rau kev ua cov ntxiv-ntxiv. Tom qab qhov sib ntxiv ua tiav, cov qauv yog tawg nrog xov xwm thiab kev ntxhov siab yog tshem tawm. Qhov no yog ua raws cov thermal isostation, kho-soluble kho / de-ignition thiab nag lossis daus tawv. Tus qauv hardness yog 40 HRC. Tom qab ntawd siv Norton. Lub tshuab hluav taws xob Magele MFP-125.50.65 ntawm Saint-Gobain Higgins Sib Tsoo Tshuab Chaw sib quas ntus zom cov qauv los ntawm Norton NQX60E24VTX2 sib tsoo lub log ntawm lub tshuab kev sib tsoo.

Ua ntej, maj mam nce qhov tob ntawm kev txiav, sib tsoo ntau thaj chaw, txiav txim siab cov khoom yuav raug tshem tawm tsawg tsawg, saum npoo ntawm qhov txuas ntxiv kev tsim kho. Qhov kev sib tsoo no yog nyob ntawm lub qhov tob ntawm kev txiav, thiab tom qab ntawd saum npoo yog tshawb xyuas qhov pom qhov tsis xws. Daim duab 4 qhia txog daim duab ntawm qhov ua piv txwv tom qab cov khoom siv tau ntxuav thaum sim. Raws li cov kev sim sim, txhawm rau tshem tawm txhua qhov ntsuas qhov ntsuas ntawm sab hauv thiab cov teeb meem saum npoo uas tshwm sim los ntawm kev tsim cov txheej txheem ntxiv, cov khoom siv los ntawm kev sib dhos yuav tsum tau muab tshem tawm kwv yees li ntawm 0.30 txog 0.45mm.

Qhov ntsuas no siv qhov sib tsoo ntev li ntawm 50.8 hli, qhov sib tsoo ntawm txoj kab uas hla ntawm 462mm thiab kev ua haujlwm ceev ntawm 23m / s. Tag nrho ntawm tsib qhov kev tshem tawm cov khoom (MRRs) tau sim hauv qhov ntau ntawm 0.1mm3 / sec. / Mm txog 3.9mm3 / sec. / Hli. Kho cov khoom siv tshem tawm tus nqi hloov los ntawm hloov qhov ceev ceev (hli / min) lossis txiav qhov tob (hli). Ntau cov khoom rho tawm tau raug ntsuas kom ntsuas qhov tshwm sim ntawm qhov qis thiab nruab nrab cov khoom tshem tawm ntawm cov nplais thiab ua tiav qhov chaw. Txawm hais tias nickel-based alloys (piv txwv li Inconel 718) tuaj yeem ua milled nrog niaj hnub engineering abrasives ntawm kev tshem tawm siab, txoj kev tshawb no tau xaiv cov khoom siv tshem tawm qis dua raws li cov khoom siv tam sim no ua tiav rau cov xov txheem Inconel ua haujlwm qhov chaw hauv kev lag luam. Nyob rau hauv cov qauv ntawm cov txheej txheem (tsis yog-tsim cov khoom lag luam) ua haujlwm qhov sib tsoo, qhov kev cia siab tshwm sim yog tias raws li cov khoom tshem tawm tus nqi nce thiab qhov sib tsoo lub zog nce, qhov saum npoo tiav (Ra) ntawm qhov kev sib tsoo ua haujlwm yuav nce lossis qhov chaw yuav dhau los rougher.

Ua ntej thiab tom qab sib tsoo, qhov saum npoo ntawm kev ua haujlwm tiav yog ntsuas siv Tsoomfwv Kev Tiv Thaiv Cov Qauv Sib Koom 5000, uas suav nrog ntau txoj haujlwm thiab ob txoj kev qhia ntawm cov haujlwm. Tsis tas li ntawd, tiv tauj tau profile tiv ntsuas kev ntsuas saum npoo qhov ntsuas tau ua nyob rau ntau qhov chaw.

Ua ntej sib tsoo, qhov saum npoo ntawm cov khoom ua los ntawm cov adder tau raug ntsuas thiab nws pom tias muaj qhov sib txawv ntawm qhov ua tiav hauv cov kev ntsuas sib txawv. Qhov ua tiav qhov nruab nrab yog 3.3 micron Ra thaum ntsuas ntsuas thiab 2.1? MRa thaum ntsuas ntsuas kab rov tav. Qhov sib txawv tseem ceeb no tsis tshwm sim thaum ntsuas cov qauv pov thawj-xeev Inconel 718 cov ntaub ntawv. Qhov sib txawv no zoo nkaus li cuam tshuam nrog 3D cov hau kev tsim khoom, tab sis qhov tseeb vim li cas tseem tsis tau paub.

Cov txheej txheem siv los ntsuas qhov nto tas tom qab kev sib tsoo siv tus tiv toj sib kis yog kom sib haum rau qhov sib tsoo, dua li ntawm cov kab sib tsoo. Nyob rau hauv txoj kev tshawb no, saum npoo tiav tau ntsuas hauv ob qhov kev taw qhia thaum uas tig mus rau txoj kab sib tsoo thiab sib dhos rau cov kab sib tsoo. Cov txiaj ntsig tom qab kev sib tsoo yog tom qab piv nrog qhov ntsuas qhov ntev thiab txoj kev ntsuas tom qab ua ntej sib tsoo.

Qhov taw tes yog tias thaum ntsuas lub nplaim tom qab sib tsoo hauv qhov kev taw qhia sib luag mus rau txoj kab sib tsoo, lub koob hla lub peaks thiab troughs ntawm kev sib tsoo kab. Thaum ntsuas nyob rau hauv ib qho kev taw qhia li qub, lub koob tau txav mus rau txoj kab sib tsoo thiab tsis txhob hla qhov siab thiab hav. Yog li ntawd, qhov tsis txaus ntseeg, hauv qhov kev tshawb fawb no, qhov (ntxhib) qhov saum npoo ntsuas qhov ntsuas tau yog qhov siab dua qhov ntsuas uas tau nyob hauv parallel.

Tom qab ntsuas qhov nto tas ntawm cov khoom tsim los ntawm cov khoom ua ntej thiab tom qab sib tsoo, nws pom tau tias muaj qhov sib txawv qhov sib txawv hauv kev ua tiav nyob rau hauv cov kev ntsuas sib txawv. Nyob hauv txoj kev tshawb no, ntsuas saum npoo tiav tau ua tiav thaum uas sib tsoo nrog cov kab sib tsoo thiab sib tshuam rau txoj kab sib tsoo, thiab cov txiaj ntsig tau tshwm sim muaj qhov sib txawv. Thaum ntsuas nyob rau hauv cov pa hluav taws xob kev taw qhia, qhov nruab nrab nto tiav ua ntej kev sib tsoo yog 3.3? MRa thiab 0.21? Ma tom qab sib tsoo. Thaum ntsuas ntsuas kab, qhov nruab nrab nto tiav yog 2.1? MRa ua ntej sib tsoo thiab 0.5? MRa tom qab sib tsoo.

Ib qho ntxiv, Qhov ntsuas ntxiv tau txheeb xyuas siv Theanovea 3D deg profiler thiab lub teeb dawb chromatric technology kom pom lub ntsej muag nta. Hauv qhov kev ntsuas no, tom qab tau txais cov khoom lag luam tsim ntxiv, qhov nruab nrab blasting yog ua nrog iav nruab nrab, tshem qhov seem ntawm qhov chaw. Cov kab uas tuaj yeem pom nyob rau saum npoo tom qab sib tsoo yog cov sab laug los ntawm kev sib tsoo ua haujlwm. Kev sib tsoo lub log los yog lwm cov khoom lag luam, xws li kev siv tshuab sib tsoo, tuaj yeem siv los txo qis cov kab saum npoo thiab tsim cov nplaim taws kom zoo, muab qhov no yog qhov tseem ceeb rau kev ua haujlwm thiab zoo ntawm lub Cheebtsam.

Txhawm rau kom nkag siab ntxiv txog qhov tshwm sim ntawm kev sib tsoo ntawm tag nrho cov txheej txheem ncaj ncees ntawm am IN718 cov qauv, qhov kev ntsuas ntawm kev nyuaj siab saum npoo av tau ua tom qab tau txais thiab sib tsoo cov qauv siv Bruker-AXS D8 Tshawb nrhiav micro-diffraction. Muab piv rau kev ntsuas ntawm 6 ntau txoj haujlwm ntawm tib tus qauv hauv ob lub xeev, nws tau pom tias qhov kev ntxhov siab ntawm seem ze rau qhov tsis zoo yog qhov tsis zoo / muaj kev zaws ntawm ob qho kev mob. Cov xwm txheej no feem ntau tshwm sim ntawm cov khoom tivthaiv tom qab kev sib tsoo zoo, thiab nws qhov kev nyob ze ntawm kev nyuaj siab yog compressible, uas tuaj yeem ncua sijhawm kis ntawm cov nplaim tawg thiab txhim kho lub neej qaug zog.

Thaum lub sijhawm kawm, qhov kev sib tsoo hluav taws xob tau raug ntsuas raws li kev tshem tawm ntawm 5 cov khoom siv. Raws li cov khoom siv tshem tawm tus nqi nce ntxiv, kom lub zog ntawm kev sib tsoo. Tus cwj pwm no muaj nyob rau hauv kev sib tsoo feem ntau. Qhov tsawg kawg nkaus ntawm 0.1mm3 / sec. / Hli, lub zog siab tshaj plaws thaum sib tsoo yog 1.4kW. Ntawm qhov siab tshaj qhov tshem tawm cov khoom ntawm 3.9mm3 / sec. / Hli, kev sib tsoo lub zog yog 10.8kW.

Cov txiaj ntsig ntawm qhov kev kawm no qhia tau tias kev sib tsoo zoo ntawm cov xaim tooj tso kua hlau alloys ua los ntawm cov quav ntxiv (piv txwv li Inconel 718) tuaj yeem txo qhov saum npoo tawv los ntawm ze li ntawm 94% (ze rau cov kab sib tsoo) lossis 34% (sib txuam rau cov kab sib tsoo). Ntawm kev thov, ultra-nplua saum npoo tuaj yeem tau txais los siv kev sib tsoo cov log lossis lwm cov khoom polishing nrog finer abrasive granularity, xws li engineering sib tsoo tapes. Tsis tas li ntawd, cov txiaj ntsig pom tau hais tias txhawm rau txhim kho qhov chaw zoo, 0.30 txog 0.45mm ntawm cov khoom siv yuav tsum tau muab tshem tawm los ntawm cov khoom sib txuas thiab txhua qhov kev cuam tshuam geometric cuam tshuam nrog 3D kev tsim cov txheej txheem raug tshem tawm. Cov kev tshem tawm tsawg kawg yog cov ntaub ntawv tseem ceeb rau cov tuam txhab tsim khoom vim lawv siv zog ua kom pom qhov loj-ze ntawm cov khoom tsim cov khoom lag luam nyob rau hauv txoj kev ua tau zoo tshaj tus nqi. Ntxiv mus, cov ntaub ntawv kev nyuab siab pom tau hais tias qhov kev ntxhov siab saum npoo tom qab sib tsoo yog compressible thiab tuaj yeem ncua qhov kev nthuav dav ntawm cov nplaim tawg, yog li txuas ntxiv lub cev qaug zog lub neej ntawm cov khoom tsim.