Kev kuaj kom tshuab yuav pab tiv thaiv kev sib txig siab hluv hluv ntawm aluminum, uas muaj kev sib txig siab hluv hluv zoo dua li polyamide ntau dua 1,000 zaug. Lawv ua haujlwm los tiv thaiv kev sib txig siab hluv hluv ntawm lub qhov chaw tsim. Yog tias tsis muaj kev kuaj kom tshuab, siab hluv hluv yuav tshwm sim raws qhov hu ua thermal bridging nyob rau hauv cov aluminum. Thaum peb xaib ib daim kab ntsug tsis sib txig siab hluv hluv los ntawm polyamide, nws tuaj yeem tiv thaiv kev sib txig siab hluv hluv no. Qhov no pab ntau heev, tshem caij siab hluv hluv ntawm saum npoo hauv thiab saum npoo nraum ntuj tau li 60% feem, kom nrog rau cov khoom tsis muaj kev kuaj kom tshuab. Lub Nqi 2024 Thermal Performance Report xwb kuj tsoom tseeb qhov no.
Qhov kev pab cuam yuav tsum tau los ntawm lub sijhawm chom nyem nyuj li ntawm xyoo 1970 thaum cov tsev tau npuas siab ntau li ib qhov plaiv hli ntawm qhov kub los ntawm cov hlwb hlwb ntoo nyiaj txiag uas tsis muaj qhov kho kom sov. Qhov no twb txawv tshaj plaws lawm. Lub tsev kho kom sov no tsim qhov yooj yim rau sab hauv thiab sab nraum, uas qhov kub yuav tsha tib si. Qhov no tuaj yeem ua rau muaj kev txawj txwm ntau: cov hlwb hlwb ntoo nyiaj txiag feem ntau muaj U-factors nyob rau hauv 1.8 tab sis tam sim no peb pom tias lawv tau hloov mus rau 0.30 nyob rau hauv cov tshab ntxhab zoo tshaj. Txog tam sim no, raws li cov kev sim tshawb nrhiav nyob rau hauv txhua lub cheeb tsam, cov tshab ntxhab tshiab no tua tau ntau yog li 90% ntawm qhov kub tsha tib si los ntawm cov hlwb hlwb. Thiab qhov zoo tshaj? Lawv tsis txhob poob qhov ceev to taub hauv tsev tom qab tag nrho qhov kev pab cuam.
Polyamide muaj qhov chaw sib txuas thiab tshuab hluav taws xob nyob ntawm 0.29 W/mK, tabsis aluminum muaj qhov 209 W/mK, yog li polyamide yog yam khoom xaum leej twg xav siv rau kev sib tshuam hluav taws xob hauv qhov chaw kho tsev. Yog siv yam khoom no nws yuav ua raws ib daim kab ntsug tshwj tsis pub hluav taws xob tauj mus los ntawm sab nraud thiab sab nraum ntawm tsev, kom hluav taws xob tsis tuaj yeem tshwm sim lossis dhau los ntawm lub tsev. Zaj tsho uas siv cov chaw sib tshuam no feem ntau yuav pom qhov siv hluav taws xob thiab nruj nplhaib hluav taws xob ciav los ntawm 30% dua li zaj tsho cuas uas tsis muaj kev sib tshuam hluav taws xob zoo li ntawv raws li kev suav los ntawm 2023 Energy Efficiency Report. Qhov sib txawv ntawm qhov kev ua haujlwm no yuav pab tau tus kheej tsev nyob rau hauv yam ntxov theem thaum lub sijhawm.
Xaiv nrog 25% lub rooj zaum hlau los ntawm lub voj voog (PA66GF25), cov khoom no tso cai rau kev sib txuas thiab tsis txhob muaj kev phom sij rau kev tiv thaiv. Lub kaumcaus ntawm 150 chaw nyob hauv plhoov tsev hauv xyoo 2022 tau pom tias cov chaw muaj PA66GF25 tau nyiag siab tshaj $740,000 txhua xyoo hauv kev lag luaj ntau dua li cov chaw siv qhov cub tsos aluminum (Ponemon 2023).
Thaum PA66GF25 muaj dej ntau dua li 0.2% ua ntej khiav, lawv yuav cuam tshwv hauv qab ntawm kev tsim. Qhov no tsim tau cov kab ntsug ntau dua li 50 microns uas ua rau pib muaj kub ntau. Ib tug neeb tshuam nyiag sib zog pub tseg nyob rau xyoo 2022 hais tias cov chaw tseg no tuaj yeem txo qhov sib tshooj kub los txog ib npaug. Tom qab ntawd yog tias siv khoom tsis raug lossis tsis txaus siab hauv kev kuaj kom sai. Tsov cia nrog lwm yam khoom tsis xav tau, tsim kev tsis zoo hauv khoom thiab tsim kub ntau dua li xav.
Kev txhuam xyuas li cas cov kab sib twg ntau yam noj tseem ceeb thaum mob tshav kub mus los ntawm kev ncig ncog. Thaum cov khaub ncaws tsim khoom, feem ntau muaj teeb meem yog tias tsis muaj siab tshaj plaws nyob hauv kev sau ua lossis yog tias qhov kho tshuab hlo tshaj. Cov teeb meem no feem ntau ua rau kab nqus tawm tsis txog 500 micrometer uas yog qhov loj txaus siab. Raws li lub tsev kho tsev Materials Performance Journal piav tseg tau dhau los, kab tawm meej meej tuaj yeem pab cuam tshav kub ntau dua li kab tawm zoo li 25%. Qhov no tsim teeb meem rau hauv khoom tshuab uas tshav kub tuaj yeem xeeb mus los ntawm qhov chaw uas yuav tsum tiv tau.
Zib meej leeg lossis hom roj tshuab tsis raug sib ntxiv rau hauv PA66GF25 uas tau rov qhib los siv yuav tuaj yeem tsim khoob kub nyiag uas tsis xav tau. Ib qhov kev suav ntawm Fraunhofer nug tshaj tawm xyoo 2021 tau qhia tias ib qhov yooj yim tshaj plua pluag. Tsis txog 2% ntawm qhov muaj zib meej leeg lossis roj tshuab tsis raug tuaj yeem cuam tshuam txog 30% ntawm qhov tiv thaiv kub. Thaum twg cov khoom siv rau tiv dej thiab tiv kab duab tsis sib thoj zoo? Lawv feem ntau yuav tsum ruaj khov ruaj tseg, uas txav tawm qhov tiv thaiv kub. Kev txaus siab tias tsis muaj zib meej leeg lossis roj tshuab tsis raug yog qhov tsis meej. Cov neeg tsim khoom yuav tsum saib xyuas kom meej meej txog dab tsi tau siv rau hauv khoom tshaiv thiab muaj kev caij rau kev suav sau nrog kev soj ntsuam sib thooj tshwj xeeb nyob hauv kev tsim khoom.
Kev tsim kom sov tawm hluv (±5°C), ntau xim, thiab kev pib tshuab yuav tsum meej. Yog hluv tawm siab tsis zoo yuav cuam tshuam rau PA66GF25's viscosity, txawv mus rau micro-void formation thiab nce thermal conductivity txog 18% (Polymer Engineering Studies, 2023). Lub screw speed tseem ceeb (40–60 RPM) yuav pab kom sib npaug; yog tshuab ntau dua ces yuav tshav kab roj breakage, txav kom insulation capacity.
Mold surface roughness nyav 1.6 µm yuav pab kom kheej kheej kev sib txuas hluv. Yog mold halves tsis raug, yuav tshwm sim qhov 0.2–0.5 mm, pab kom hluv tauj mus, ua rau energy loss txog 14%. Finite element analysis (FEA) simulations pom tias draft angles nyav 1° yuav nce residual stress txog 22%, txeem kom insulation stability nyob hauv lub sijhawm ntev.
Puag ncig no, cov nqi siv tsis raug no ua rau muaj 63% ntawm cov khaubncaws tso cua sov tawm ua ntej nyob rau hauv qhov chaw muaj dej num (lub taub hlis 2022 kho tiam neeg).
PA66GF25 muaj kev sib txuas nyob rau hauv kev ruaj khov thiab kev ruaj ntseg. Txhawm rau 25% sib txuas nrog sib thooj tuaj yeem pheej zog mus rau 12,000 psi (Cov Ntaub Ntawv Tshawb Fawv 2022), tab sis nws tseem pheej zog tso cua sov los ntawm 18–22% kom compared to unfilled polyamide. Cov neeg tsim kho tiam no suav nrog:
Qhov kev npaj no txwv 85% ntawm qhov chaw siv hluav taws xob thaum muaj kev sib dhau U-values nyer 1.0 W/m²K.
NFRC 2023 cov ntaub ntawv nyeem tias txog 34% ntawm cov kev xa khoom siv rau cheebtsheb muaj qhov tsis zoo uas tsis tuaj yeem tiv thaiv kub:
Cov kev kho kom zoo yuav suav nyob hauv kev siv khoom siv los tso tseg thiab kev test sijhawm uas tau rhuab tshim los ntawm ASTM E283/E331- rhuab tshim los daws kev tshwm sim ntawm kev tso tseg kub. Cov kev tso tseg uas tau muab them nyob rau hauv 29–37% tsis meej nyob rau hauv kev tshawb nrhiav nyob rau hauv av no tsis kub.
Kev saib xyuas nyob rau hauv 80–90°C rau 4–6 teev li sao kom tsawg dua 0.1%, kom tiv thaiv kev tshwm sim ntawm cov ntim hluv hluv nyob hauv kev tso tseg. Cov kev tso tseg tswj hwm thiab kev tso tseg tswj hwm kom tsis muaj khaub ncaws. Cov kev tso tseg tshiab no pab kom muaj kev tso tseg kub zoo dua 12–15% nyob rau hauv cov khoom tiav.
Qhauv uas pab txo qhov sib txawv mus rau ±0.05mm tuaj yeem pab tswj tau qhov sib npaug hauv daim duab, uas yog qhov tseem ceeb heev thaum xav tswj qhov kub uas tsis xav tau. Cov kev lag luam siv hluv tshaj tawm no feem ntau saib xyuas ib co yam khoom zoo li lub tshuab sov kub uas nyob ntujkoo 240 thiab 260 degrees Celsius, thiab lub rooj pov ncauj rov qab rov forward nyob ntujkoo 25 thiab 35 revolutions per minute. Qhov no pab tswj cov khoom ua tiav kom muaj qhov sib xws raug rau kev sau ua. Tom qab ntawd yog phaum kub, qhov chaw ua tiav yuav siv neej tshaj tawm los phaum kub tawm tas li, tib siab tshaj 180 degrees mus rau 60 degrees. Qhov kev tshaj tawm no tuaj yeem txo qhov kheeb kwm uas tsim tawm rau kev ua tiav khoom, uas yog qhov tshwm sim thaum khoom ua tiav poob. Siv tag nrho cov kev lag luam no tuaj yeem txo qhov kheeb kwm ntawm kub phom tes los ntawm li 40% dua li kev lag luam ntxiv tshiab uas yuav siv hauv hnub no.
Kev tswj xyuas kom meej meej tau sau:
Kev sau npe los ntawm laser kho kom pom tau cov raj uas loj dua 0.3mm, thiab kev xaiv tso rau hauv chav tsim khoom raws standards EN 14024 rau kev pab cuam kawg tshav txaus ntseeg
Xov xwm kub
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