Dab tsi cuam tshuam qhov kev txhawb nqa seem muaj rau cov hlau 3D luam tawm?

Ib, Muaj peev xwm txaus ntshai ntawm residual kev them nyiaj yug rau cov neeg kho tshuab zoo ntawm qhov chaw
1. Concentration ntawm residual kev ntxhov siab thiab kev pheej hmoo ntawm kev tawg
Thaum cov hlau yog 3D luam tawm, cov kev ntxhov siab uas seem tuaj yeem tsim tau yooj yim ntawm kev sib txuas ntawm cov kev txhawb nqa thiab cov khoom. Qhov no yog vim qhov thermal expansion coefficients txawv. Yog tias qhov kev txhawb nqa seem tsis raug tshem tawm tag nrho, qhov chaw nyob qhov twg qhov kev ntxhov siab yog concentrated yuav yog qhov chaw tawg pib. Piv txwv li, yog tias qhov kev txhawb nqa seem tsis raug tshem tawm thaum luam ntawv aviation cav hniav, nws tuaj yeem ua rau muaj kev ntxhov siab rau ntawm qhov kawg ntawm cov hniav. Qhov no tuaj yeem ua rau qaug zog tawg thiab txwv lub neej ntawm cov khoom hauv siab - qhov kub thiab txias. Xi'an Jiaotong University txoj kev tshawb fawb qhia tau hais tias thaum titanium alloy qhov chaw tau txais kev txhawb nqa nrog cov kev ntxhov siab uas tsis tau kho, lawv cov kev ntxhov siab seem yog 30% mus rau 50% ntau dua li qhov yuav tsum tau ua, uas ua rau lawv tsis tshua muaj zog tiv taus.
2. Cov ntaub ntawv tsis zoo
Kev them nyiaj yug residual tuaj yeem hloov txoj kev ntawm cov khoom siv hauv cov khoom siv. Nyob rau hauv cov txheej txheem laser xaiv melting (SLM), kev sib txuas ntawm kev txhawb nqa thiab ib feem yuav tsim cov nplej ntxhib los yog cov txheej txheem metastable vim yog qhov kub thiab txias. Cov kws tshawb fawb hauv University of Beihang tau siv electron backscatter diffraction (EBSD) kom pom tias cov nplej loj txhawb qhov seem seem yog 2 mus rau 3 npaug loj dua li ntawm cov substrate. Qhov no ua rau cov khoom siv 15% mus rau 20% tsawg zog thiab cuam tshuam rau nws hnav tsis kam.
3. Deviation nyob rau hauv geometric precision
Kev txhawb nqa seem tuaj yeem hloov qhov loj ntawm qhov nws tus kheej. Yog tias qhov kev txhawb nqa seem ua rau lub ntsej muag ntawm 0.1 hli hauv kev cog lus kho mob zoo li acetabular khob, nws tuaj yeem ua rau cov nqaij mos hauv lub cev tom qab cog. Qhov tseeb- piv txwv hauv ntiaj teb los ntawm kev lag luam qhia tias qhov kev txhawb nqa seem ua rau qhov sib txawv ntawm qhov sib txawv ntawm 0.08mm nyob rau hauv ib qho qauv ntawm turbine disk, uas yog sab nraud ntawm qhov siv tau thiab ua rau tag nrho lub tshuab sib dhos ua tsis tiav.
2, Kev txhawb nqa seem muaj kev cuam tshuam tsis zoo rau qhov zoo ntawm qhov chaw.
1. Qhov roughness ntawm qhov saum npoo yuav tsis zoo
Milling thiab sandpaper polishing yog ob qho kev txhawb nqa txhua yam uas tuaj yeem tawm khawb ntawm cov khoom. Piv txwv li, cobalt chromium alloy brackets tuaj yeem muaj qhov roughness Ra tus nqi ntawm 3.2 μm tom qab polished los ntawm tes nrog cov ntawv xuab zeb. Txawm li cas los xij, tus nqi no tuaj yeem txo qis rau 0.2 μm siv electrochemical polishing. Kev lag luam khoom siv kho mob hais tias qhov tsis zoo ntawm qhov chaw tsim los ntawm cov nyiaj them poob haujlwm tau ua rau nws 40% ntau dua tias cov khoom yuav tsum tau rov ua haujlwm dua thiab tau nce nqi ntau lawm.
2. Kev pheej hmoo ntawm cov tshuaj lom neeg muaj kuab lom
Yog tias koj tsis tswj hwm qhov concentration ntawm cov tshuaj kom raug thaum cov tshuaj etching tshem tawm cov kev txhawb nqa, koj tuaj yeem xaus nrog kev xeb los yog pitting. Thaum aluminium alloy qhov chaw nyob rau hauv acidic etching tov rau ntev dhau lawm, lawv yuav tsim corrosion pits ntawm qhov chaw uas yog 0.5 mus rau 2 hli dav. Qhov no ua rau lawv tsis tshua muaj kev tiv thaiv corrosion. Ib lub tuam txhab uas ua rau lub tsheb poob ntau tshaj li ib lab yuan hauv kev lag luam ncaj qha poob vim qhov kev txhawb nqa seem ua rau ntau qhov chaw rau corrode ntawm qhov chaw.
3. Cov teeb meem nyob rau hauv tshav kub cuam tshuam cheeb tsam (HAZ)
Thaum laser txiav kev txhawb nqa, qhov kub thiab txias tuaj yeem tsim cov txheej txheem ntawm qhov chaw remelting. Tom qab laser txiav, remelted txheej thickness ntawm Inconel 718 siab - kub alloy qhov chaw tuaj yeem ncav cuag 50-100 μm. Qhov no ua rau cov khoom 10% -15% tsawg zog thiab cuam tshuam rau lawv lub zog ntawm qhov kub thiab txias. Los ntawm zoo- kho qhov chaw laser (pulse width<10 μ s, peak current<5A), GE Additive has greatly enhanced the quality of the surface by controlling the thickness of the remelted layer to within 20 μ m.
3, Cov kev txwv uas cov kev txhawb nqa seem tso rau ntawm kev ua haujlwm thiab tus nqi hauv kev ua haujlwm
1. Tus nqi ntawm kev xa ntawv - lub sijhawm ua haujlwm tau dhau los ntawm lub ru tsev
Nws yuav siv li 30% mus rau 50% ntawm tag nrho cov voj voog ntau lawm los ua cov txheej txheem nyuaj yam tsis muaj kev pab. Piv txwv li, lub combustion chamber plhaub ntawm ib lub dav hlau cav muaj ib tug nyuaj sab hauv kev them nyiaj yug qauv uas yuav siv sij hawm 120 teev los ntawm txhais tes. Tab sis thaum koj siv cov ntaub ntawv soluble, lub sij hawm nws yuav siv sij hawm rau yaj yog txiav mus rau 8 teev ib thooj, thiab cov efficiency yog nce los ntawm 15 zaug.
2. Cov ntaub ntawv pov tseg thiab teeb meem rov ua dua tshiab
Ntau cov hmoov hlau yog siv los ntawm cov qauv txhawb nqa. Piv txwv li, nrog SLM thev naus laus zis, cov khoom siv txhawb nqa tuaj yeem ua 20% txog 30% ntawm tag nrho cov nyiaj siv. Yog tias cov nyiaj them poob qis ua rau cov hmoov tsis zoo (piv txwv li, yog tias titanium alloy hmoov sib xyaw rau hauv stainless hlau txhawb), tus nqi ntawm kev rov ua dua tshiab yuav nce 50% mus rau 100%. Leiming Laser tau txiav cov nqi ntawm cov khoom txhawb nqa siv rau ib qho qauv ntawm cov khoom siv los ntawm 40% los ntawm kev txhim kho tus qauv tsim ntawm kev txhawb nqa. Qhov no txuag lub tuam txhab ntau dua 2 lab yuan ib xyoos hauv cov nqi hmoov.
3. Cov nqi hnav thiab tsim kua muag ntawm cov khoom siv thiab kev tu
Hloov cov cuab yeej txhawb nqa tshuab (xws li kev sib tsoo lub log thiab cov tshuab txiav milling) feem ntau nce tus nqi ntawm kev tswj cov cuab yeej. Ib lub tuam txhab tsim pwm tshwj xeeb hais tias cov cuab yeej siv los ntawm kev txhawb nqa cov khoom seem tau nce nqi txij nkawm txhua xyoo los ntawm 300,000 yuan, thiab kev tu ncua sij hawm tau txiav cov peev txheej ntau lawm los ntawm 15%.
4, Cov tswv yim zoo los pab daws cov teeb meem seem
1. Kev ua kom zoo tshaj plaws ntawm cov qauv kev txhawb nqa
Optimization ntawm topology: Siv cov software simulation zoo li Magics los tsim cov qauv kev txhawb nqa hnyav uas yuav txo qis qhov chaw sib cuag. Tom qab hloov mus rau tsob ntoo-zoo li kev txhawb nqa tsim, ib lub lag luam txiav cov ntaub ntawv txhawb nqa nws siv los ntawm 60% thiab lub sijhawm nws siv los txhawb los ntawm 75%.
Cov khoom uas tuaj yeem yaj tau: Dej- cov kev txhawb nqa soluble xws li polyvinyl cawv (PVA) yog siv los yaj thiab tshem tawm cov txheej txheem sab hauv cov kab noj hniav kom lawv tsis txhob kov ib leeg. Cov khoom siv txhawb nqa PVA rau EOS M290 cov cuab yeej siv tau zoo los ua qhov chaw rau lub dav hlau.
2. Tshuab rau kev txhawb nqa yam tsis muaj kev sib cuag
Kev them nyiaj yug nrog ultrasound: Siv siab - zaus vibration (20–40 kHz) los rhuav tshem cov qauv kev txhawb nqa, uas yog qhov zoo rau qhov tseeb. Lub tshuab Sonic Mill tuaj yeem ua haujlwm nrog kev txhawb nqa uas tsawg dua 0.5 hli inch thiab muaj qhov roughness ntawm qhov tsawg dua 0.4 μm.
Plasma etching: Siv qis -plasma kub (ib qho sib xyaw ntawm Ar thiab O2 gases) los xaiv tshem tawm cov kev txhawb nqa yam tsis ua rau muaj kev cuam tshuam thermal. Magnalux's magnetic polishing tov tau siv los txhawb cobalt chromium alloy brackets, thiab qhov zoo ntawm qhov chaw yog raws li kev kho mob.
3. Cov kev cai ntse ntawm kev ua tsis tau
Kev txiav txim siab tsawg: Hlau txiav (WEDM) siv cov chaw nrog lub mem tes dav ntawm tsawg dua 10 μs thiab lub ncov tam sim no tsawg dua 5A kom txo cov cua sov tawm. Los ntawm optimizing tsis, ib lub tuam txhab muaj peev xwm tswj cov thickness ntawm remelted txheej ntawm titanium alloy qhov chaw tom qab txiav mus rau hauv 15 μm.
Txheej milling: Txhawm rau nthuav tawm cov quab yuam, txheej txheej milling nrog me me txiav qhov tob (<0.2mm) and a high feed rate (>500mm / min) yog siv rau kev txhawb nqa tuab. Qhov no yog li cas DMG MORI's tsib -axis machining chaw tswj qhov cuam tshuam ntawm kev txhawb nqa tshem tawm hauv 0.02mm.
4. Kev tiv thaiv thiab kho tom qab ua tiav
Kho nrog laser cladding: Rau micro khawb uas tshwm sim tom qab tshem tawm kev txhawb nqa, tib cov khoom siv rau kev kho laser cladding. Lub cladding txheej yog 10-50 μm tuab thiab muaj lub zog sib txuas ntawm tshaj 400 MPa. Cov thev naus laus zis no tau ua haujlwm los ntawm qee qhov chaw tsim khoom ntawm aviation qhov chaw kom coj cov tawv tawv ntawm cov khoom rov qab mus rau ntau dua 95% ntawm tus nqi tsim.
Electrochemical polishing: Siv cov khoom siv electrolyte (xws li kev sib xyaw ntawm phosphoric acid thiab sulfuric acid) los xaiv ua kom cov pob zeb tawg kom ua tiav. Tom qab electrochemical polishing, nto roughness Ra ntawm titanium alloy qhov chaw yuav raug txo los ntawm 3.2 μm mus rau 0.2 μm, thiab lawv cov kev tiv thaiv corrosion tuaj yeem nce peb zaug.