Resin transfer molding (RTM) txheej txheem yog cov txheej txheem ua kua molding rau cov khoom siv fiber ntau siv cov khoom sib xyaw, uas feem ntau suav nrog:
(1) Tsim cov fiber ntau preforms raws li cov duab thiab kev ua haujlwm ntawm cov khoom tsim nyog;
(2) Pw lub preform fiber ntau preform nyob rau hauv lub pwm, kaw lub pwm thiab compress nws kom tau raws li cov ntim feem ntawm lub fiber preform;
(3) Nyob rau hauv cov cuab yeej tshwj xeeb txhaj tshuaj, txhaj cov resin rau hauv pwm ntawm lub siab thiab kub kom tshem tawm cov huab cua thiab muab tso rau hauv cov fiber ntau preform;
(4) Tom qab cov fiber ntau preform yog kiag li raus hauv resin, cov tshuaj tiv thaiv kho yog nqa tawm ntawm qhov kub thiab txias kom txog thaum cov tshuaj tiv thaiv kho tiav, thiab cov khoom kawg raug muab tshem tawm.
Lub resin hloov siab yog lub ntsiab parameter uas yuav tsum tau tswj nyob rau hauv cov txheej txheem RTM.Lub siab no yog siv los kov yeej qhov kev tiv thaiv thaum lub sij hawm txhaj tshuaj rau hauv pwm kab noj hniav thiab immersion ntawm cov khoom siv reinforcing.Lub sij hawm rau resin kom tiav kev sib kis yog cuam tshuam nrog lub zog siab thiab kub, thiab lub sij hawm luv luv tuaj yeem txhim kho kev tsim khoom.Tab sis yog hais tias cov resin txaus tus nqi siab dhau lawm, cov nplaum tsis tuaj yeem nkag mus rau cov khoom siv ntxiv rau lub sijhawm, thiab kev sib tsoo tuaj yeem tshwm sim vim qhov nce hauv qhov system siab.Yog li ntawd, nws yog feem ntau yuav tsum tau hais tias cov resin kua theem nkag mus rau hauv pwm thaum lub sij hawm hloov cov txheej txheem yuav tsum tsis txhob sawv sai tshaj 25mm / min.Saib xyuas cov txheej txheem hloov pauv los ntawm kev soj ntsuam qhov chaw nres nkoj tawm.Nws yog feem ntau xav tias cov txheej txheem hloov pauv tau ua tiav thaum txhua qhov chaw soj ntsuam ntawm cov pwm tau dhau ntawm cov kua nplaum thiab tsis tso cov npuas, thiab qhov tseeb ntawm cov resin ntxiv yog qhov tseem ceeb tib yam li qhov xav tau ntawm cov khoom ntxiv.Yog li ntawd, kev teeb tsa ntawm qhov hluav taws xob tso tawm yuav tsum tau ua tib zoo xav txog.
Resin xaiv
Kev xaiv cov txheej txheem resin yog tus yuam sij rau RTM txheej txheem.Qhov zoo tshaj plaws viscosity yog 0.025-0.03Pa •s thaum cov resin tso rau hauv pwm kab noj hniav thiab sai infiltrated rau hauv fibers.Polyester resin muaj viscosity tsawg thiab tuaj yeem ua tiav los ntawm kev txhaj tshuaj txias ntawm chav tsev kub.Txawm li cas los xij, vim qhov kev ua tau zoo sib txawv ntawm cov khoom, ntau hom resins yuav raug xaiv, thiab lawv cov viscosity yuav tsis zoo ib yam.Yog li ntawd, qhov luaj li cas ntawm cov kav dej thiab lub taub hau txhaj tshuaj yuav tsum tau tsim kom tau raws li cov kev xav tau ntawm cov khoom tsim tshwj xeeb.Cov resins haum rau RTM txheej txheem muaj xws li polyester resin, epoxy resin, phenolic resin, polyimide resin, thiab lwm yam.
Kev xaiv cov khoom siv dag zog
Hauv cov txheej txheem RTM, cov khoom siv txhawb zog tuaj yeem xaiv tau xws li iav fiber ntau, graphite fiber, carbon fiber, silicon carbide, thiab aramid fiber.Ntau yam tuaj yeem xaiv raws li kev xav tau tsim, suav nrog luv luv fibers, unidirectional fabrics, ntau axis fabrics, weaving, knitting, core cov ntaub ntawv, los yog preforms.
Los ntawm kev xav ntawm cov khoom ua tau zoo, cov khoom tsim los ntawm cov txheej txheem no muaj cov khoom siv fiber ntau ntau thiab tuaj yeem tsim nrog cov fiber ntau hauv zos raws li cov duab tshwj xeeb ntawm cov khoom, uas muaj txiaj ntsig zoo rau kev txhim kho cov khoom lag luam.Los ntawm kev xav ntawm cov nqi tsim khoom, 70% ntawm tus nqi ntawm cov khoom sib xyaw yog los ntawm cov nqi tsim khoom.Yog li ntawd, yuav ua li cas txo cov nqi tsim khoom yog qhov teeb meem tseem ceeb uas yuav tsum tau daws sai sai hauv kev tsim cov khoom sib xyaw.Piv nrog rau cov tsoos kub pressing tank tshuab rau kev tsim cov khoom siv sib xyaw ua ke, cov txheej txheem RTM tsis xav tau lub cev kim kim, txo cov nqi tsim khoom.Ntxiv mus, cov khoom tsim los ntawm cov txheej txheem RTM tsis txwv los ntawm lub tank loj, thiab qhov loj ntawm cov khoom yog hloov tau yooj yim, uas tuaj yeem tsim cov khoom loj thiab kev ua haujlwm siab.Zuag qhia tag nrho, RTM txheej txheem tau siv dav thiab tsim kho sai hauv kev tsim cov khoom siv sib xyaw, thiab tau ua tiav los ua cov txheej txheem tseem ceeb hauv kev tsim cov khoom sib xyaw.
Nyob rau hauv xyoo tas los no, cov khoom siv sib xyaw ua ke hauv kev lag luam aerospace tau maj mam hloov los ntawm cov khoom tsis muaj cov kabmob thiab cov khoom me me rau cov khoom loj thauj khoom thiab cov khoom sib xyaw loj.Muaj kev thov ceev rau kev tsim khoom ntawm cov khoom siv loj thiab ua haujlwm siab.Yog li ntawd, cov txheej txheem xws li lub tshuab nqus tsev pab hloov moulding (VA-RTM) thiab lub teeb resin hloov molding (L-RTM) tau tsim.
Nqus pab resin hloov molding txheej txheem VA-RTM
Lub tshuab nqus tsev pab hloov pauv cov txheej txheem VA-RTM yog txheej txheem thev naus laus zis los ntawm cov txheej txheem RTM ib txwm muaj.Cov txheej txheem tseem ceeb ntawm cov txheej txheem no yog siv lub tshuab nqus tsev twj thiab lwm yam khoom siv los nqus cov pwm sab hauv qhov twg cov fiber ntau preform nyob, kom cov resin txhaj rau hauv pwm raws li qhov kev txiav txim ntawm lub tshuab nqus tsev tsis zoo, ua tiav cov txheej txheem infiltration. cov fiber ntau preform, thiab thaum kawg solidifying thiab tsim nyob rau hauv lub pwm kom tau raws li qhov xav tau cov duab thiab fiber ntau feem ntawm cov khoom sib xyaw.
Piv rau RTM technology, VA-RTM thev naus laus zis siv lub tshuab nqus tsev nqus hauv pwm, uas tuaj yeem txo qhov kev txhaj tshuaj siab hauv pwm thiab txo qhov deformation ntawm pwm thiab fiber ntau preform, yog li txo qhov kev ua tau zoo ntawm cov txheej txheem rau cov khoom siv thiab pwm. .Nws kuj tso cai rau RTM thev naus laus zis siv cov pwm sib zog, uas yog qhov zoo rau kev txo cov nqi tsim khoom.Yog li ntawd, cov cuab yeej no yog qhov tsim nyog rau kev tsim cov khoom sib xyaw loj, Piv txwv li, ua npuas ncauj sandwich composite phaj yog ib qho ntawm cov khoom siv loj hauv kev lag luam aerospace.
Zuag qhia tag nrho, cov txheej txheem VA-RTM yog qhov tsim nyog rau kev npaj cov khoom siv dav hlau loj thiab ua haujlwm siab.Txawm li cas los xij, cov txheej txheem no tseem yog semi-mechanized hauv Suav teb, uas ua rau cov khoom lag luam qis qis.Ntxiv mus, tus qauv tsim ntawm cov txheej txheem tsis feem ntau yog nyob ntawm kev paub dhau los, thiab cov qauv tsim ntse tseem tsis tau ua tiav, ua rau nws nyuaj rau kev tswj xyuas cov khoom zoo.Nyob rau tib lub sijhawm, ntau cov kev tshawb fawb tau taw qhia tias lub siab gradients tau yooj yim tsim nyob rau hauv cov kev taw qhia ntawm resin flow thaum lub sij hawm tus txheej txheem no, tshwj xeeb tshaj yog thaum siv lub nqus tsev vacuum hnab, yuav muaj ib tug tej yam kev mob ntawm lub siab so nyob rau hauv pem hauv ntej ntawm resin flow, uas yuav muaj ib tug tej yam degree ntawm siab so nyob rau hauv lub xub ntiag ntawm resin flow. cuam tshuam cov resin infiltration, ua npuas rau hauv lub workpiece, thiab txo cov khoom siv ntawm cov khoom.Nyob rau tib lub sijhawm, kev faib tsis sib xws yuav ua rau qhov tsis sib xws ntawm cov khoom sib txawv ntawm cov khoom ua haujlwm, cuam tshuam rau qhov zoo ntawm qhov ua haujlwm kawg, qhov no kuj yog ib qho kev sib tw uas cov thev naus laus zis tseem xav tau los daws.
Lub teeb resin hloov molding txheej txheem L-RTM txheej txheem
L-RTM txheej txheem rau lub teeb yuag resin hloov molding yog ib hom tshiab ntawm cov cuab yeej tsim los ntawm cov txheej txheem VA-RTM ib txwm siv.Raws li pom nyob rau hauv daim duab, lub ntsiab feature ntawm cov txheej txheem no technology yog hais tias lub qis pwm txais ib tug hlau los yog lwm yam pwm nruj, thiab lub sab sauv pwm txais ib tug semi nruj pwm.Sab hauv ntawm pwm yog tsim los nrog ob chav sealing qauv, thiab cov pwm sab sauv yog tsau sab nraud los ntawm lub tshuab nqus tsev, thaum sab hauv siv lub tshuab nqus tsev los qhia cov resin.Vim yog siv cov pwm semi-rigid pwm nyob rau hauv lub pwm pwm ntawm cov txheej txheem no, thiab lub tshuab nqus tsev hauv pwm, lub siab hauv pwm thiab cov nqi tsim khoom ntawm pwm nws tus kheej tau txo qis heev.Cov tshuab no tuaj yeem tsim cov khoom sib xyaw loj.Piv nrog cov txheej txheem VA-RTM ib txwm muaj, cov tuab ntawm cov khoom tau txais los ntawm cov txheej txheem no zoo ib yam thiab qhov zoo ntawm qhov chaw sab sauv thiab sab qis yog superior.Nyob rau tib lub sijhawm, kev siv cov ntaub ntawv semi-rigid nyob rau hauv cov pwm tuaj yeem rov qab siv tau, Cov thev naus laus zis no zam cov hnab ntim khoom pov tseg hauv VA-RTM txheej txheem, ua rau nws tsim nyog rau kev tsim cov khoom siv aerospace nrog cov kev xav tau zoo.
Txawm li cas los xij, hauv cov txheej txheem tsim khoom tiag tiag, tseem muaj qee yam kev nyuaj hauv cov txheej txheem no:
(1) Vim yog siv cov ntaub ntawv semi-rigid nyob rau hauv lub pwm sab sauv, tsis txaus rigidity ntawm cov khoom yuav yooj yim ua rau lub cev qhuav dej thaum lub tshuab nqus tsev pwm txheej txheem, uas ua rau lub thickness ntawm lub workpiece tsis sib xws thiab cuam tshuam rau nws nto zoo.Nyob rau tib lub sijhawm, qhov rigidity ntawm pwm kuj cuam tshuam rau lub neej ntawm pwm nws tus kheej.Yuav ua li cas xaiv cov khoom siv semi-rigid zoo li cov pwm rau L-RTM yog ib qho teeb meem ntawm kev siv cov txheej txheem no.
(2) Vim yog siv lub tshuab nqus tsev twj tso kua mis hauv L-RTM txheej txheem tshuab pwm, kev sib khi ntawm cov pwm ua lub luag haujlwm tseem ceeb hauv kev ua tiav ntawm cov txheej txheem.Kev sib khi tsis txaus tuaj yeem ua rau tsis txaus resin infiltration hauv lub workpiece, yog li cuam tshuam rau nws cov kev ua tau zoo.Yog li ntawd, pwm sealing tshuab yog ib qho ntawm cov teeb meem hauv kev siv cov txheej txheem no.
(3) Cov resin siv nyob rau hauv cov txheej txheem L-RTM yuav tsum tswj kom tsis muaj viscosity thaum lub sij hawm ntim cov txheej txheem los txo cov kev txhaj tshuaj thiab txhim kho lub neej kev pab cuam ntawm pwm.Tsim kom muaj qhov tsim nyog resin matrix yog ib qho kev nyuaj hauv kev siv cov txheej txheem no.
(4) Nyob rau hauv cov txheej txheem L-RTM, feem ntau nws yog tsim nyog los tsim cov ndlwg channel ntawm pwm los txhawb cov resin flow.Yog tias qhov kev tsim channel ntws tsis tsim nyog, nws tuaj yeem ua rau muaj qhov tsis xws li qhov chaw qhuav thiab cov roj nplua nuj nyob hauv qhov chaw, cuam tshuam rau qhov kawg ntawm qhov zoo.Tshwj xeeb tshaj yog rau complex peb-dimensional qhov chaw, yuav ua li cas los tsim cov pwm ntws channel tsim nyog kuj yog ib qho ntawm cov kev teeb meem nyob rau hauv daim ntawv thov ntawm cov txheej txheem no.
Post lub sij hawm: Jan-18-2024
