Cov caij ntsiag zoo tshaj plaws ntawm lub tshuab cuab yeej nrog qhov xim ntev rau kev tsim khoom thermal break strip yog dab tsi?

Daim Qauv Kawm Ntau: Geometry, Flow, thiab Qhov Chai Hlau

Thag tsis ntawm extrusion tuag daim qauv txiav txim siab tias ob qho: kev nyob ruaj khov ntawm thermal break strips thiab kev pab cuam hauv kev tsim kho. Cov kws tshawb fawb hauv cheeb tsam nug tias 92% ntawm cov ntaus ntawv tsim kho hlawm nyob rau hauv polyamide-based thermal barriers los ntawm daim qauv geometry tsis zoo (2024 Polymer Processing Review).

Die Opening Size thiab Cross-Sectional Geometry rau Thermal Break Strips

Cov die opening uas tau tsim los kom meej meej tuaj yeem kompensate rau qhov hluas ntawm vaj huam sib luag—feem ntau yog 2–4% hauv polymer composites—ntsim thaum twg tuaj yeem tswj xyuas kev sib txawv hauv qhov chaw ±0.1 mm. Rau cov thermal break muaj chaw ntxoov ntxoo, cov stepped mandrel qauv tiv thaiv kev flow stagnation, nyob ib leeg tiv thaiv kev sib txawv hauv qhov chaw ntim insulation.

Qhov Chaw Tso Tseg (Runner) Daim Qauv Thiab Nws Kev Txiav Txim Siab Rau Kev Sib Tso Vaj Huam Sib Luag

Qhov chaw nqus kho tshuab tsav dav hlau siv kev sim kab ntsug (CFD) los txhim kho qhov chaw nqus, txav tsis pub muaj qhov loj me me ntawm tus nqi tshuab tsav dav hlau ntawm 15% hauv qhov dav ntawm qhov profile. Txog li cas li cas Extrusion Technology Benchmark 2023, cov kab ntsug rooj plhaub rooj plhaub txo qhov cuam tshuab siab dua li 22% kom compared rau cov kab ntsug ncig ncig, txo qhov ceev thiab zoo dua hauv kev siv zog thiab kev sib xws ntawm qhov thawb.

Daim ntawv xa khoom thiab Qhov Chaw Nqus Sib Xws Hauv Qhov Chaw Nqus Tshuab Tsav Dav Hlau

Ntev dua daim ntawv xa khoom (6–12 mm rau cov polymer muaj kab ntsug hlau) txhim kho kev nyob siab ntawm qhov chaw nqus, txo qhov loj me me mus rau saum 0.25 mm/m. Tab sis, ntev heev tshwm qhov cuam tshuab siab; kev suav xyaum los ntawm MIT pom tias txhua millimeter ntxiv tom qis dua qhov yooj yim txo tus nqi tshuab tsav dav hlau los ntawm 3.7% hauv kev tshuab tsav dav hlau tshuab tsav dav hlau.

Kev Xyaum Txog Rheology Hauv Polymer Thiab Composite Flow Thru Qhov Chaw Nqus

Cov teb chaw siv tshuab ntau hauv qab rau die walls tsim kev siv viscosity los ntawm 10⁴ Pa·s hauv cov dundoj polymer. Die lips uas muaj kws tswj temperatura, khiav raws ±1.5°C, txhim khu kev siv melt viscosity thiab yog yam tseemceeb kom tau txais 75–85 Shore D hardness nyob rau hauv thermal break strips uas muaj nyob saum toj.

Kev Tswj Hwm Txoj Cai: Nrhiav kom meej kom muaj temperatura zoo ib yam hauv Extrusion Dies

Kev Tswj Temperature thiab Kev Nyob Zag Zoo hauv Sijhawm Thaum Khiav Ntev

Kev txhim kho dej tshuaj hniav nyob rau ib qhov ceev tshaj plaws rau kev rov qhab thiab tiv thaiv cov ntxaij ntawm yam khoom. Tsab ntsis tshiab siv kws qhia uas muaj thermocouples uas tau pub tswv yim tib moment, yog li nthuav tshwm tsis tu ncua hauv ib thaj duab ntawm die - feem ntau hauv qhov chaw 1.5 degrees Celsius tag nrho thaj chaw ntawm die. Ntawm no pab kom txo cov kev hlo li cas uas cuam tshuam rau viscosity uas ua rau ntau nplog tshaj tshwv thaum kawg loj thiab txias. Raws li qee qhov kev su xov xwm los ntawm APTech xyoo 2023, cov kev hlo ntawm tebchaws no tej tus account rau ib feem phau ntawv hauv ob lim hli ntawm cov ntxaij uas muaj nyob rau hauv kev cuam tshuam ntawm thermal. Cov raj nroog siv tshuab xa dej tso deb li lub thawj chaw tseem tiv thaiv kev cuam tshuam ntawm kev cuam tshuam, uas txhais tau tias cov chaw ua haujlwm tuaj yeem mus smoothly tib neeg thaum mob rau materials ntawm speeds siab dua 12 meters per minute tsis tas txhob raug mob.

Kev Cuam Tshuam ntawm Thermal Gradients rau Die Performance thiab Strip Quality

Txhawm rau txoj kab tuaj li ntawm tsawv tsab kub tshaj tshiab li 6 degrees Celsius nyob rau qhov chaw sib txawv ntawm lub die face tuaj yeem cuam tshwm ntau rau qhov xwm yeem ntawm cov khoom. Qhov ceev ntawm kev hloov kho tau 18% thaum tus leej twg muaj kev ua lej zoo dua thiab kev ua lej hloov kho tau 32% raws li cov tshuaj xyuas industry no hais tawm los ntawm 2023. Thaum cov chaw kub tshaj tshiab tshaug tawm hauv qhov kev tsim kho, lawv tsim kev sib txawv ntawm kev sov kub rau hauv vaj huav tsev. Qhov no ua rau muaj kev nyuaj siab hauv vaj huav tsev uas thaum kawg cuam tshwm rau kev pab cuam tiv thaiv thaum kawg. Cov neeg tsim khoom uas sau kev coj kub zoo dua feem ntau yuav pom kev pab hloov kho nyob rau hauv qhov kev tsim kho. Tus leej twg muaj kev kho taub yuav diminua los li 15% thiab tus leej twg muaj kev tsim kho yuav nce los li 22% thaum kev caij kub remains consistent rau sab nraud ntawm lub khoom tshwj tsim hauv manufacturing cycles.

Kev Cuam Tshwm Ntawm Kev Nyiag Nyiam Thiab Kev Tsis Pub Nyob Rau Hauv Die Channels

Kev Caij Kev Nyiag Nyiam Rau Sab Nraud Ntawm Die Thiab Nws Qhov Kev Cuam Tshwm Rau Output Consistency

Yog xav tau kev nruj siab sib npaug yooj yim, ces yog qhov tseemceeb heev los ntawm kev txhim kho kev ntsuas nrawm dav hlau thaum siv cov thermal break strips. Thaum muaj kev hlo li cas los ntawm dua 20% ntawm die face, yam tsis zoo yuav pheej zho tshwm sim. Kev sib thaub yuav tsis muaj kev raug ib yam, uas cuaca rau tej teeb meem zoo li kev nqus, thiab cov teeb meem ntawm saum npoo uas tsis muaj leej twg xav pom. Ntau qhov chaw tag nrho tau siv kev ntsuas nyob zej zdheb los ntawm cov pressure sensors nyob hauv system kom sau ceev kev hlo li cas, feem ntau yog ib tug kheej ntawm +/- 5%. Tom qab ntawd muaj lub CFD-guided adjustments uas pab txhua yam. Cov tapered runners tuaj zoo, thiab tej kev hlo li cas ntawm bearing lengths. Lawv kev hlo li cas no tuaj yeem khaws ceev cov pressure spikes hauv qhov chaw los ntawm 30%, uas pab ntau heev rau kev txhim kho qhov seem ntawm cov khoom.

Txhim kho kev sib thaub sib npaug los ntawm kev txhim kho kev hlo li cas ntawm kev nruj siab

Kev nrhiav kom pom qhov tseemceeb nyob rau hauv kev txuas xyooj li cas yog ib qho tseemceeb ntawm kev tsim kho cov kab uas muaj kev sib txuas nrog yam khoom thaum lawv dhau los. Rau cov neeg uas ua haujlwm nrog polymer thermal breaks, kev hloov qhov ntev ntawm lub teb chaws los ntawa kev sib cuag thiab qhov siab ntawm qhov chaw tshwj xeeb nyob rau hauv 1.5 mus rau 1 tuaj yeem txo qhov txij nkawm dhau los sai ntawm li 40% raws li peb pom nyob rau hauv kev kawm txog kev dhau los. Lub tsev hlob tshiab feem ntau muaj cov khoom siv sib txuas zoo tshaj plaws uas muaj kev txwv kev dhau los thiab muaj cov mandrels uas tuaj yeem hloov tau uas pab saib xyuas kev hloov viscosity thaum lawv tsim tshuaj. Sauv kev txwv siab hauv 15 MPa per meter tuaj yeem tso kom muaj kev sib txawv hauv qhov nyiag hauv 1% xeev, uas tshwm sim los taug kev ASTM kev cai rau kev ua haujlwm zoo hauv thermal rau tib lub neej.

Die Materials: Thaum Kev Tseemceeb, Txoj Cai Txuas Heat, Thiab Nqi

Kev xaiv khoom siv tsis tau cuam tshuam rau kev ua haujlwm ntawm die, ntau lossis meej nqi tshau, thiab qhov txheej txheem ntawm khoom. Qhov kev lees paub tseem ceeb yog kev tiv thaiv kom tsis pub hlo, kev nyob deb ntawm kluav tsoom hluv tsoom, thiab kev raug zoo nrog tus naj npawb tshau.

Thaj Chaw Siv Hlau Zoo Thiab Nws Txoj Hwm Rau Kev Nyob Ntev ntawm Die

Nyob hauv kev tsim khoom ntau tshaj plaws, H13 thiab D2 tool steels yog qhov leej twg xav tau los ntawm lawv qhov ceev kub uas tuaj yeem txog li 55 HRC thiab tsoj siab nyob deb tshaj 600 degrees Celsius. Raws li cov ntsiab lus tshiab uas ASM International pub tseg hais tias nyob rau hlis 2023, ob hom no tuaj yeem tsoj siab txog li 95% ntawm qhov ceev thawj li ntawm 10,000 lub sijhawm tsim khoom. Qhov no ua rau muaj kev hloov kho tsawg dua li feem ntau steel, txhawb kom tsawg kho nyob rau hauv sijhawm ntev. Qhov uas ua rau lawv txawv tshaj plaws yog qhov sib xyaw ntawm chromium thiab molybdenum hauv lawv qhov chaw nyob uas pab tiv thaiv kev phom sij los ntawm cov dundub polymer uas feem ntau siv nyob rau hauv kev tsim khoom. Tom qab ntawd, qhov sib txawv me me hauv cov khoom no tiv thaiv kev ruaj ruaj, uas yog qhov tseem ceeb tshaj plaws thaum siv khoom nyob rau hauv khoom yooj yim tshaig li fiberglass reinforced plastics, qhov chaw uas ib qho chyeej me me tuaj yeem ntxim noj mus rau qhov nyuaj.