Tam sim no, muaj ntau txoj kev tsim khoom rau cov khoom siv sib xyaw, uas tuaj yeem siv rau kev tsim khoom thiab kev tsim cov qauv sib txawv.Txawm li cas los xij, xav txog kev tsim cov khoom lag luam thiab cov nqi tsim khoom ntawm kev lag luam aviation, tshwj xeeb tshaj yog cov dav hlau dav hlau, nws yog qhov tseem ceeb los txhim kho cov txheej txheem kho kom txo tau lub sijhawm thiab cov nqi.Rapid Prototyping yog ib txoj kev tsim khoom tshiab raws li cov hauv paus ntsiab lus ntawm kev sib cais thiab sib sau ua ke, uas yog tus nqi qis-nqi sai prototyping thev naus laus zis.Cov thev naus laus zis muaj xws li compression molding, ua kua, thiab cov khoom siv thermoplastic sib sau ua ke.
1. Pwm nias ceev prototyping tshuab
Kev siv thev naus laus zis sai ntawm molding yog txheej txheem uas muab tso rau hauv prepreg blanks hauv pwm molding, thiab tom qab cov pwm raug kaw, cov blanks yog compacted thiab solidified los ntawm cua sov thiab siab.Lub molding ceev yog ceev, cov khoom loj yog qhov tseeb, thiab molding zoo yog ruaj khov thiab zoo ib yam.Ua ke nrog automation thev naus laus zis, nws tuaj yeem ua tiav ntau lawm, automation, thiab tus nqi qis ntawm cov khoom siv hluav taws xob sib xyaw ua ke hauv kev ua haujlwm ntawm pej xeem aviation.
Moulding cov kauj ruam:
① Tau txais cov pwm muaj zog hlau uas phim qhov ntev ntawm qhov yuav tsum tau ua rau kev tsim khoom, thiab tom qab ntawd nruab cov pwm rau hauv xovxwm thiab kub nws.
② Preform cov ntaub ntawv sib xyaw uas yuav tsum tau ua rau hauv cov pwm.Preforming yog ib kauj ruam tseem ceeb uas pab txhim kho kev ua tau zoo ntawm cov khoom tiav.
③ Ntxig cov khoom preformed rau hauv cov pwm kub.Tom qab ntawd compress cov pwm ntawm lub siab heev, feem ntau yog li ntawm 800psi mus rau 2000psi (nyob ntawm seb lub thickness ntawm ib feem thiab hom khoom siv).
④ Tom qab tso lub siab, tshem tawm ib feem ntawm cov pwm thiab tshem tawm cov burrs.
Qhov zoo ntawm molding:
Rau ntau yam yog vim li cas, molding yog ib tug nrov technology.Ib feem ntawm qhov laj thawj yog vim li cas nws thiaj li nrov yog vim nws siv cov ntaub ntawv zoo heev.Piv nrog rau cov khoom siv hlau, cov ntaub ntawv no feem ntau muaj zog dua, sib zog dua, thiab ntau dua corrosion-resistant, ua rau cov khoom muaj zog zoo dua.
Lwm qhov zoo ntawm molding yog nws lub peev xwm los tsim cov khoom siv ntau heev.Txawm hais tias cov thev naus laus zis no tsis tuaj yeem ua tiav qhov nrawm ntawm cov yas txhaj tshuaj molding, nws muab ntau cov duab geometric piv rau cov khoom siv laminated sib xyaw.Piv rau cov yas txhaj tshuaj molding, nws kuj tso cai rau cov fibers ntev dua, ua rau cov khoom muaj zog.Yog li ntawd, molding tuaj yeem pom raws li hauv nruab nrab ntawm cov yas txhaj tshuaj molding thiab laminated composite khoom tsim.
1.1 SMC Cov Txheej Txheem
SMC yog cov ntawv luv rau cov ntawv hlau ua cov ntaub ntawv sib xyaw, uas yog, cov ntawv hlau ua cov ntaub ntawv sib xyaw.Cov ntaub ntawv tseem ceeb yog tsim los ntawm SMC cov xov paj tshwj xeeb, cov khoom siv tsis zoo, cov khoom siv qis qis, cov khoom ntim khoom, thiab ntau yam khoom ntxiv.Nyob rau hauv thaum ntxov 1960s, nws thawj zaug tshwm nyob rau hauv cov teb chaws Europe.Nyob ib ncig ntawm 1965, Tebchaws Asmeskas thiab Nyij Pooj tau tsim cov thev naus laus zis no.Thaum xyoo 1980s, Tuam Tshoj tau tshaj tawm SMC cov kab ntau lawm thiab cov txheej txheem los ntawm txawv teb chaws.SMC muaj qhov zoo xws li kev ua tau zoo ntawm hluav taws xob, kev tiv thaiv corrosion, lub teeb yuag, thiab kev tsim qauv yooj yim thiab hloov tau yooj yim.Nws cov khoom siv tshuab tuaj yeem sib piv rau qee yam khoom siv hlau, yog li nws tau siv dav hauv kev lag luam xws li kev thauj mus los, kev tsim kho, hluav taws xob, thiab hluav taws xob engineering.
1.2 BMC Kev Ua Haujlwm
Nyob rau hauv 1961, lub unsaturated resin sheet molding compound (SMC) tsim los ntawm Bayer AG nyob rau hauv lub teb chaws Yelemees twb launched.Nyob rau xyoo 1960, Bulk Molding Compound (BMC) tau pib txhawb nqa, tseem hu ua DMC (Dough Molding Compound) hauv Tebchaws Europe, uas tsis yog thickened nyob rau hauv nws cov theem thaum ntxov (1950s);Raws li American txhais, BMC yog tuab BMC.Tom qab lees txais cov cuab yeej siv thev naus laus zis hauv European, Nyij Pooj tau ua tiav qhov tseem ceeb hauv daim ntawv thov thiab kev loj hlob ntawm BMC, thiab los ntawm 1980s, thev naus laus zis tau dhau los ua neeg paub tab.Txog tam sim no, cov matrix siv hauv BMC tau tsis muaj cov polyester cob.
BMC belongs rau thermosetting plastics.Raws li cov yam ntxwv ntawm cov khoom siv, qhov kub ntawm cov khoom ntim ntawm lub tshuab txhaj tshuaj molding yuav tsum tsis txhob siab dhau los pab txhawb cov khoom ntws.Yog li ntawd, nyob rau hauv kev txhaj tshuaj molding txheej txheem ntawm BMC, kev tswj qhov kub ntawm cov khoom chim yog ib qho tseem ceeb heev, thiab ib tug tswj system yuav tsum nyob rau hauv qhov chaw los xyuas kom meej qhov haum ntawm qhov kub thiab txias, thiaj li yuav ua tau qhov zoo tshaj plaws kub ntawm cov khoom noj rau seem. nozzle.
1.3 Polycyclopentadiene (PDCPD) molding
Polycyclopentadiene (PDCPD) moulding feem ntau yog cov ntshiab matrix es tsis yog cov yas ntxiv.Lub hauv paus ntsiab lus ntawm PDCPD molding txheej txheem, uas tshwm sim nyob rau hauv 1984, belongs rau tib yam li polyurethane (PU) molding, thiab yog thawj tsim los ntawm lub tebchaws United States thiab Nyiv.
Telene, ib lub chaw muag khoom ntawm Japanese tuam txhab Zeon Corporation (nyob hauv Bondues, Fabkis), tau ua tiav zoo hauv kev tshawb fawb thiab kev tsim kho ntawm PDCPD thiab nws cov kev lag luam.
RIM molding txheej txheem nws tus kheej yog yooj yim rau automate thiab muaj nqi zog zog piv rau cov txheej txheem xws li FRP spraying, RTM, los yog SMC.Tus nqi pwm siv los ntawm PDCPD RIM yog qis dua li ntawm SMC.Piv txwv li, lub cav hood pwm ntawm Kenworth W900L siv lub plhaub npib tsib xee thiab cam khwb cia txhuas core, nrog rau qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom tsuas yog 1.03, uas tsis tsuas yog txo cov nqi tab sis kuj txo qhov hnyav.
1.4 Direct Online Forming ntawm Fiber Reinforced Thermoplastic Composite Materials (LFT-D)
Nyob ib ncig ntawm 1990, LFT (Long Fiber Reinforced Thermoplastics Direct) tau qhia rau kev lag luam hauv Tebchaws Europe thiab Asmeskas.CPI tuam txhab nyob rau hauv lub tebchaws United States yog lub ntiaj teb no thawj lub tuam txhab los tsim ncaj qha nyob rau hauv kab puas ntev fiber reinforced thermoplastic molding khoom thiab coj technology (LFT-D, Direct In Line Mixing).Nws tau nkag mus rau kev lag luam hauv xyoo 1991 thiab yog tus thawj coj thoob ntiaj teb hauv daim teb no.Diffenbarcher, ib lub tuam txhab German, tau tshawb nrhiav LFT-D thev naus laus zis txij li xyoo 1989. Tam sim no, muaj cov LFT D, Tailored LFT (uas tuaj yeem ua tiav cov kev txhawb zog hauv zos raws li cov qauv kev ntxhov siab), thiab Advanced Surface LFT-D (pom pom, qhov siab. zoo) technologies.Los ntawm kev xav ntawm cov kab ntau lawm, theem ntawm Diffenbarcher cov xovxwm yog siab heev.D-LFT extrusion system ntawm German Cooperation tuam txhab yog nyob rau hauv ib tug ua txoj hauj lwm thoob ntiaj teb.
1.5 Mouldless Casting Manufacturing Technology (PCM)
PCM (Pattern tsawg Casting Manufacturing) yog tsim los ntawm Laser Rapid Prototyping Center ntawm Tsinghua University.Kev siv thev naus laus zis sai sai yuav tsum tau siv rau cov txheej txheem ntawm cov xuab zeb casting.Ua ntej, tau txais cov qauv CAD los ntawm ntu CAD qauv.Cov ntaub ntawv STL ntawm cov qauv CAD yog txheej txheej kom tau txais cov ntaub ntawv hla ntu ntu, uas yog siv los tsim cov ntaub ntawv tswj.Thaum lub sij hawm molding txheej txheem, thawj lub nozzle raug tshuaj tsuag cov nplaum rau txhua txheej ntawm cov xuab zeb los ntawm lub computer tswj, thaum lub thib ob nozzle txau cov catalyst raws tib txoj kev.Ob leeg tau txais kev sib koom ua ke, ua kom cov xuab zeb txheej los ntawm txheej thiab tsim ib pawg.Cov xuab zeb nyob rau hauv qhov chaw uas cov nplaum thiab cov catalyst ua hauj lwm ua ke yog solidified ua ke, thaum cov xuab zeb nyob rau hauv lwm qhov chaw tseem nyob rau hauv ib tug granular xeev.Tom qab kho ib txheej, txheej tom ntej yog sib koom, thiab tom qab tag nrho cov khaubncaws sab nraud povtseg, tau txais ib qho chaw spatial.Cov xuab zeb qub tseem yog cov xuab zeb qhuav nyob rau hauv qhov chaw uas cov nplaum tsis tau txau, ua kom yooj yim tshem tawm.Los ntawm kev ntxuav tawm cov xuab zeb qhuav tsis huv hauv nruab nrab, tuaj yeem tau txais cov pwm pwm nrog cov phab ntsa tuab.Tom qab ua ntawv thov lossis impregnating xim rau sab hauv ntawm cov xuab zeb pwm, nws tuaj yeem siv rau kev nchuav hlau.
Qhov kub taw tes ntawm PCM txheej txheem feem ntau yog nyob ib ncig ntawm 170 ℃.Qhov tseeb txias tso thiab txias stripping siv hauv PCM txheej txheem yog txawv ntawm molding.Txias nteg thiab txias stripping yuav maj mam nteg prepreg ntawm pwm raws li cov qauv khoom yuav tsum tau thaum lub pwm yog nyob rau hauv txias kawg, thiab ces kaw lub pwm nrog rau txoj kev xovxwm tom qab lub nteg tiav lawm kom muab ib tug tej yam siab.Nyob rau lub sijhawm no, cov pwm yog rhuab siv lub tshuab pwm kub, Cov txheej txheem ib txwm yog nce qhov kub ntawm chav tsev mus rau 170 ℃, thiab cov cua kub yuav tsum tau kho raws li cov khoom sib txawv.Feem ntau ntawm lawv yog ua los ntawm cov yas no.Thaum cov pwm kub nce mus txog qhov kub thiab txias, kev rwb thaiv tsev thiab kev ceev ceev yog nqa tawm los kho cov khoom ntawm qhov kub thiab txias.Tom qab kho tiav lawm, nws tseem yuav tsum tau siv lub tshuab pwm kub kom txias pwm pwm kom sov li qub, thiab cov cua kub kuj tau teem rau ntawm 3-5 ℃ / min, Tom qab ntawd pib pwm qhib thiab tshem tawm ib feem.
2. Ua kua siv tshuab
Liquid forming thev naus laus zis (LCM) yog hais txog cov khoom siv sib xyaw ua ke uas ua ntej qhov chaw qhuav fiber ntau preforms nyob rau hauv lub kaw pwm kab noj hniav, ces txhaj cov kua resin rau hauv pwm kab noj hniav tom qab kaw pwm.Nyob rau hauv siab, cov resin ntws thiab soaks cov fibers.Piv nrog rau qhov kub nias tuaj yeem tsim cov txheej txheem, LCM muaj ntau qhov zoo, xws li tsim nyog rau kev tsim khoom nrog qhov tseeb qhov tseeb thiab cov tsos;Tus nqi tsim khoom tsawg thiab kev ua haujlwm yooj yim.
Tshwj xeeb tshaj yog cov txheej txheem high-pressure RTM tsim nyob rau hauv xyoo tas los no, HP-RTM (High Pressure Resin Transfer Molding), abbreviated as HP-RTM molding process.Nws yog hais txog cov txheej txheem molding ntawm kev siv high-pressure siab los sib tov thiab txhaj cov resin rau hauv lub tshuab nqus tsev ntim pwm ua ntej nteg nrog cov ntaub ntawv fiber ntau thiab cov khoom ua ntej embedded, thiab tom qab ntawd tau txais cov khoom siv sib xyaw los ntawm cov khoom ntim dej, impregnation, curing, thiab demolding. .Los ntawm kev txo lub sij hawm txhaj tshuaj, nws yuav tsum tswj lub sij hawm tsim khoom ntawm aviation structural Cheebtsam nyob rau hauv kaum tawm feeb, ua tiav cov ntsiab lus fiber ntau thiab cov khoom ua haujlwm siab.
HP-RTM txoj kev tsim cov txheej txheem yog ib qho ntawm cov khoom sib xyaw ua cov txheej txheem dav siv hauv ntau qhov kev lag luam.Nws qhov zoo yog qhov muaj peev xwm ua tiav cov nqi qis, lub voj voog luv luv, ntau lawm, thiab cov khoom lag luam zoo (nrog rau qhov zoo ntawm qhov zoo) piv rau cov txheej txheem RTM ib txwm muaj.Nws yog dav siv nyob rau hauv ntau yam industries xws li automotive manufacturing, shipbuilding, aircraft manufacturing, ua liaj ua teb machinery, railway tsheb thauj mus los, cua zog tsim, khoom kis las, thiab lwm yam.
3. Thermoplastic composite material forming technology
Nyob rau hauv xyoo tas los no, cov ntaub ntawv thermoplastic composite tau dhau los ua qhov kev tshawb fawb hotspot nyob rau hauv kev lag luam ntawm cov khoom siv sib xyaw ua haujlwm hauv tsev thiab txawv teb chaws, vim lawv qhov zoo ntawm kev cuam tshuam tsis zoo, siab toughness, siab kam rau ua kev puas tsuaj, thiab kub tsis kam.Vuam nrog cov ntaub ntawv thermoplastic composite tuaj yeem txo tus naj npawb ntawm rivet thiab ntsia liaj qhov rooj sib txuas hauv cov qauv dav hlau, zoo heev txhim kho kev tsim khoom thiab txo cov nqi tsim khoom.Raws li Airframe Collins Aerospace, thawj-chav xa khoom ntawm cov qauv dav hlau, tsis kub nias tuaj yeem tsim cov txheej txheem thermoplastic weldable muaj peev xwm ua kom luv luv lub voj voog tsim los ntawm 80% piv rau cov hlau thiab thermosetting cov khoom sib xyaw.
Kev siv cov khoom tsim nyog tshaj plaws, kev xaiv cov txheej txheem kev lag luam tshaj plaws, kev siv cov khoom siv hauv cov khoom tsim nyog, kev ua tiav ntawm cov hom phiaj tsim ua ntej, thiab kev ua tiav ntawm qhov zoo tshaj plaws kev ua tau zoo tus nqi piv ntawm cov khoom ib txwm yog cov kev taw qhia. ntawm kev siv zog rau cov khoom siv sib xyaw.Kuv ntseeg tias ntau cov txheej txheem molding yuav raug tsim nyob rau yav tom ntej kom tau raws li cov kev xav tau ntawm kev tsim khoom.
Post lub sij hawm: Nov-21-2023
