Njira yopangira resin transfer molding (RTM) ndi njira yopangira madzi yopangira zinthu zophatikizika ndi fiber-reinforced resin, zomwe zimaphatikizapo:
(1) Pangani ma preforms a fiber molingana ndi mawonekedwe ndi zofunikira zamakina pamagawo ofunikira;
(2) Ikani preform ya fiber preform mu nkhungu, kutseka nkhungu ndikuifinya kuti mupeze gawo lolingana la gawo la fiber preform;
(3) Pansi pa zida zapadera za jakisoni, bayani utomoni mu nkhungu pazovuta zina ndi kutentha kuti muchotse mpweya ndikuwumiza mu fiber preform;
(4) Pambuyo pa fiber preform kumizidwa kwathunthu mu utomoni, kuchiritsa kumachitika pa kutentha kwina mpaka kuchiritsa kumalizidwa, ndipo chomaliza chimachotsedwa.
Kuthamanga kwa utomoni ndiye gawo lalikulu lomwe liyenera kuwongoleredwa munjira ya RTM.Kupanikizika kumeneku kumagwiritsidwa ntchito kuthana ndi kukana komwe kumakumana ndi jekeseni mu nkhungu ndikumizidwa kwa zinthu zolimbitsa.Nthawi yoti utomoni umalize kufalitsa ndi yokhudzana ndi kuthamanga kwa dongosolo ndi kutentha, ndipo nthawi yayifupi imatha kupititsa patsogolo kupanga bwino.Koma ngati kuthamanga kwa utomoni ndikwambiri, zomatira sizingalowe muzinthu zolimbikitsira munthawi yake, ndipo ngozi zitha kuchitika chifukwa cha kuchuluka kwamphamvu kwa dongosolo.Chifukwa chake, nthawi zambiri pamafunika kuti mulingo wamadzimadzi wa utomoni womwe umalowa mu nkhungu panthawi yakusamutsa usawuke mwachangu kuposa 25mm/min.Yang'anirani njira yosinthira utomoni poyang'ana doko lotulutsa.Nthawi zambiri amaganiziridwa kuti kusamutsa kumalizidwa pamene madoko onse owonetsetsa pa nkhungu adzaza ndi guluu ndipo satulutsanso thovu, ndipo kuchuluka kwenikweni kwa utomoni wowonjezeredwa kumakhala kofanana ndi kuchuluka kwa utomoni womwe ukuyembekezeredwa.Choncho, kukhazikitsidwa kwa malo otulutsa mpweya kuyenera kuganiziridwa bwino.
Kusankhidwa kwa resin
Kusankhidwa kwa resin system ndiye chinsinsi cha njira ya RTM.Kukhuthala koyenera ndi 0.025-0.03Pa • s pamene utomoni umatulutsidwa mu nkhungu ndikulowetsa mofulumira mu ulusi.Utomoni wa polyester uli ndi kukhuthala kochepa ndipo ukhoza kumalizidwa ndi jekeseni wozizira kutentha.Komabe, chifukwa cha zofunikira zosiyanasiyana za ntchito, mitundu yosiyanasiyana ya ma resin idzasankhidwa, ndipo kukhuthala kwawo sikudzakhala kofanana.Choncho, kukula kwa payipi ndi mutu wa jekeseni ziyenera kupangidwa kuti zigwirizane ndi zofunikira zoyendetsera zigawo zapadera zoyenera.Ma resins oyenerera njira ya RTM amaphatikiza utomoni wa polyester, epoxy resin, phenolic resin, polyimide resin, etc.
Kusankhidwa kwa zida zolimbikitsira
Munjira ya RTM, zida zolimbikitsira zitha kusankhidwa monga ulusi wagalasi, ulusi wa graphite, ulusi wa kaboni, silicon carbide, ndi fiber aramid.Zosiyanasiyana zitha kusankhidwa malinga ndi zosowa zamapangidwe, kuphatikiza ulusi wodula, nsalu za unidirectional, nsalu zamitundu yambiri, kuluka, kuluka, zida zapakati, kapena zoyambira.
Kutengera momwe zinthu zimagwirira ntchito, magawo omwe amapangidwa ndi njirayi amakhala ndi kagawo kakang'ono kakang'ono ka fiber ndipo amatha kupangidwa ndi kulimbitsa ulusi wakomweko molingana ndi mawonekedwe ake, omwe ndi opindulitsa pakuwongolera magwiridwe antchito.Malinga ndi mtengo wopangira, 70% ya mtengo wamagulu ophatikizika amachokera ku ndalama zopangira.Choncho, momwe mungachepetsere ndalama zopangira ndi nkhani yofunika kwambiri yomwe iyenera kuthetsedwa mwamsanga pakupanga zipangizo zopangira.Poyerekeza ndi ukadaulo wamatekinoloje wamatekinoloje otentha opangira zida zopangira utomoni, njira ya RTM simafuna ma tanki okwera mtengo, kuchepetsa kwambiri ndalama zopangira.Komanso, zigawo zomwe zimapangidwa ndi ndondomeko ya RTM sizimangokhala ndi kukula kwa thanki, ndipo kukula kwake kwa zigawozo kumakhala kosavuta, komwe kungathe kupanga zigawo zazikulu komanso zogwira ntchito kwambiri.Ponseponse, njira ya RTM yakhala ikugwiritsidwa ntchito kwambiri ndikupangidwa mwachangu pantchito yopanga zinthu zophatikizika, ndipo ikuyenera kukhala njira yayikulu pakupangira zinthu zambiri.
M'zaka zaposachedwa, zinthu zophatikizika m'makampani opanga zakuthambo zasintha pang'onopang'ono kuchoka kuzinthu zosanyamula katundu ndi zida zazing'ono kupita kuzinthu zazikulu zonyamula katundu ndi zida zazikulu zophatikizika.Pali kufunikira kwachangu pakupanga zida zazikulu komanso zogwira ntchito kwambiri.Chifukwa chake, njira monga vacuum assisted resin transfer molding (VA-RTM) ndi light resin transfer molding (L-RTM) zapangidwa.
Vacuum inathandizira kusamutsa utomoni kuumba njira VA-RTM
Njira yopangira vacuum yothandizira kusamutsa utomoni VA-RTM ndiukadaulo waukadaulo wochokera kumayendedwe achikhalidwe a RTM.Njira yayikulu yochitira izi ndikugwiritsa ntchito mapampu a vacuum ndi zida zina kuti zisungunuke mkati mwa nkhungu pomwe pali fiber preform, kotero kuti utomoni umalowetsedwa mu nkhunguyo potengera kupanikizika kwa vacuum negative, kukwaniritsa njira yolowera. CHIKWANGWANI preform, ndipo potsiriza kulimba ndi kupanga mkati mwa nkhungu kuti apeze mawonekedwe ofunikira ndi kagawo kakang'ono ka CHIKWANGWANI cha zigawo zazinthu zophatikizika.
Poyerekeza ndi luso chikhalidwe RTM, VA-RTM luso ntchito vacuum kupopera mkati nkhungu, amene angathe kuchepetsa kuthamanga jekeseni mkati nkhungu ndi kuchepetsa kwambiri mapindikidwe nkhungu ndi CHIKWANGWANI preform, potero kuchepetsa ntchito zofunika ndondomeko ya zipangizo ndi zisamere pachakudya. .Zimathandizanso ukadaulo wa RTM kugwiritsa ntchito nkhungu zopepuka, zomwe zimapindulitsa kuchepetsa ndalama zopangira.Choncho, luso limeneli ndi oyenera kupanga zigawo zikuluzikulu gulu, Mwachitsanzo, thovu masangweji gulu mbale ndi mmodzi wa ambiri ntchito zigawo zikuluzikulu mu munda zamlengalenga.
Ponseponse, njira ya VA-RTM ndiyabwino kwambiri pokonzekera zida zazikulu komanso zogwira ntchito kwambiri zamlengalenga.Komabe, njirayi ikadali yopangidwa ku China, zomwe zimapangitsa kuti zinthu zisamayende bwino.Komanso, kamangidwe ka magawo ndondomeko makamaka amadalira zinachitikira, ndi kamangidwe wanzeru sichinakwaniritsidwebe, kupangitsa kukhala kovuta kulamulira molondola khalidwe mankhwala.Nthawi yomweyo, kafukufuku wambiri wawonetsa kuti ma gradients amapangidwa mosavuta polowera utomoni panthawiyi, makamaka mukamagwiritsa ntchito matumba a vacuum, padzakhala kupuma pang'ono kutsogolo kwa utomoni wotuluka, womwe udzakhala. zimakhudza kulowetsedwa kwa utomoni, zimapangitsa kuti thovu lipangidwe mkati mwa workpiece, ndi kuchepetsa makina a mankhwala.Panthawi imodzimodziyo, kugawanika kwapang'onopang'ono kosagwirizana kudzachititsa kugawanika kwa makulidwe osagwirizana a workpiece, zomwe zimakhudza maonekedwe a workpiece yomaliza, Izi ndizovuta zaumisiri zomwe teknoloji ikufunikabe kuthetsa.
Njira yosinthira utomoni wopepuka wa L-RTM
Njira ya L-RTM yopangira utomoni wopepuka ndi mtundu watsopano waukadaulo wopangidwa pamaziko aukadaulo wamakono a VA-RTM.Monga momwe tawonetsera pachithunzichi, mbali yaikulu ya teknolojiyi ndi yakuti nkhungu yapansi imatenga chitsulo kapena nkhungu zina zolimba, ndipo nkhungu yapamwamba imatenga nkhungu yopepuka yopepuka.Mkati mwa nkhunguyo amapangidwa ndi mawonekedwe osindikizira awiri, ndipo nkhungu yapamwamba imayikidwa kunja kudzera mu vacuum, pamene mkati mwake amagwiritsa ntchito vacuum kuyambitsa utomoni.Chifukwa cha kugwiritsa ntchito nkhungu yokhazikika mu nkhungu yapamwamba ya ndondomekoyi, ndi dziko lopanda mpweya mkati mwa nkhungu, kupanikizika mkati mwa nkhungu ndi kupanga mtengo wa nkhunguyo kumachepetsedwa kwambiri.Tekinoloje iyi imatha kupanga zigawo zazikulu zophatikizika.Poyerekeza ndi ndondomeko yachikhalidwe ya VA-RTM, makulidwe a zigawo zomwe zimapezedwa ndi ndondomekoyi ndizofanana kwambiri ndipo khalidwe lapamwamba ndi lapansi ndilopambana.Panthawi imodzimodziyo, kugwiritsa ntchito zipangizo zolimba mu nkhungu zapamwamba zitha kugwiritsidwanso ntchito, Ukadaulowu umapewa kuwononga matumba a vacuum mu njira ya VA-RTM, ndikupangitsa kuti ikhale yoyenera kwambiri popanga zida zam'mlengalenga zokhala ndi zofunikira zapamwamba zapamwamba.
Komabe, pakupanga kwenikweni, pali zovuta zina zaukadaulo pakuchita izi:
(1) Chifukwa cha ntchito theka-okhwima zipangizo mu nkhungu chapamwamba, osakwanira rigidity wa zinthu mosavuta kuchititsa kugwa pa vakuyumu anakonza nkhungu ndondomeko, chifukwa mu mkangano makulidwe a workpiece ndi kumakhudza pamwamba khalidwe.Panthawi imodzimodziyo, kuuma kwa nkhungu kumakhudzanso moyo wa nkhungu yokha.Momwe mungasankhire chinthu choyenera chokhazikika ngati nkhungu ya L-RTM ndi chimodzi mwazovuta zaukadaulo pakugwiritsira ntchito njirayi.
(2) Chifukwa chogwiritsa ntchito kupopera vacuum mkati mwa nkhungu yaukadaulo ya L-RTM, kusindikiza nkhungu kumagwira ntchito yofunika kwambiri pakuyenda bwino kwa njirayi.Kusasindikiza kosakwanira kungayambitse kulowetsedwa kosakwanira kwa resin mkati mwa workpiece, motero kumakhudza momwe amagwirira ntchito.Choncho, teknoloji yosindikiza nkhungu ndi imodzi mwazovuta zaukadaulo pakugwiritsa ntchito njirayi.
(3) Utomoni womwe umagwiritsidwa ntchito munjira ya L-RTM uyenera kukhala ndi mawonekedwe otsika panthawi yodzaza kuti uchepetse kuthamanga kwa jekeseni ndikuwongolera moyo wautumiki wa nkhungu.Kupanga matrix oyenera a utomoni ndi chimodzi mwazovuta zaukadaulo pakugwiritsa ntchito njirayi.
(4) Mu ndondomeko ya L-RTM, nthawi zambiri zimakhala zofunikira kupanga njira zowonongeka pa nkhungu kuti zilimbikitse kutuluka kwa utomoni wofanana.Ngati njira yoyendetsera njirayo si yabwino, imatha kuyambitsa zolakwika monga mawanga owuma ndi mafuta ochulukirapo m'zigawozo, zomwe zimakhudza kwambiri mawonekedwe omaliza a zigawozo.Makamaka mbali zovuta-dimensional, momwe mungapangire njira yotaya nkhungu momveka bwino ndi chimodzi mwazovuta zaukadaulo pakugwiritsa ntchito njirayi.
Nthawi yotumiza: Jan-18-2024
