Lub tswv yim tseem ceeb rau kev tiv thaiv cov khoom degradation yog ua raws li "zoo txaus", teeb tsa qhov kub khiav kub nyob rau hauv qis qis ntawm lub qhov rais nyab xeeb ntawm cov khoom kub melting thiab thermal decomposition kub, thiab nruj me ntsis tswj lub sij hawm nyob thiab shear tshav kub ntawm cov yaj nyob rau hauv lub khiav.
Raws li koj tus khub kws tshaj lij, kuv nkag siab koj cov kev txhawj xeeb txog kev tiv thaiv cov pob dub, nyiaj streaks, lossis txawm tias khiav thaiv hauv cov ntaub ntawv xws li ABS lossis PC vim overheating thaum lub sijhawm tu. Qhov kub thiab txias ntau dhau yog qhov tseem ceeb rau kev ua txhaum ntawm cov saw hlau polymer (thermal degradation), thiab nws tsis yooj yim li tsuas yog "teem tus nqi." Hauv qab no, sib txuas koj cov kev txhawj xeeb txog kev sib txuam kho vajtse thiab kev ua kom zoo, Kuv tau piav qhia txog kev tswj qhov kub thiab txias los tiv thaiv kev puas tsuaj:
1. Precisely Lock nyob rau hauv "Safe Temperature Window" Cov ntaub ntawv sib txawv muaj qhov sib txawv thermal stability; Qhov ntsuas kub yuav tsum nruj me ntsis ua raws li cov khoom siv tus yam ntxwv, tawm hauv kev nyab xeeb txaus (feem ntau yog 10℃~ 20℃hauv qab qhov kub decomposition).
Thaum tshav kub kub- cov ntaub ntawv rhiab heev (piv txwv li, ABS, PVC, nplaim taws- cov yas retardant):
Risk: Tsawg decomposition kub, muaj feem xyuam rau cov pob dub los yog corrosive gases vim lub zos overheating.
Teem lub tswv yim: Txais qhov "tsawg kub, siab siab" tswv yim. Piv txwv li, rau ABS, kub khiav kub yuav tsum tau tswj ntawm 230℃thiab 245 degree, thiab nruj me ntsis txwv tsis pub tshaj 260 degree. Yog tias cov nyiaj streaks pom nyob rau ntawm cov khoom, ua ntej xyuas seb nws puas yog vim decomposition los ntawm qhov kub thiab txias, tsis yog qhov muag tsis pom qhov kub.
Lus Cim: Rau cov nplaim taws- cov ntaub ntawv retardant, lawv qhov decomposition kub feem ntau qis dua cov qib zoo tib yam, yuav tsum tau ntxiv 5℃mus rau 10℃txo tus nqi.
High viscosity / siab kub cov ntaub ntawv (xws li, PC, PEEK):
Risk: Kub kub yuav tsum tau tswj kom muaj fluidity, tab sis ntev raug rau siab kub kuj yuav ua rau degradation.
Kev teeb tsa lub tswv yim: Txais lub tswv yim "siab kub, nrawm nrawm". Cov ntaub ntawv PC feem ntau yuav tsum tau teeb tsa ntawm 280℃mus rau 310 degree, tab sis nws yog ib qho tseem ceeb kom ntseeg tau tias tsis muaj qhov chaw tuag hauv cov neeg khiav dej num los tiv thaiv cov yaj stagnation. Yog tias lub sijhawm poob qis tshaj 10 feeb, tus khiav yuav tsum tau txias los yog khiav tawm.
Cov ntaub ntawv dav dav (piv txwv li PP, PE):
Kev teeb tsa lub tswv yim: Kev pom zoo rau lub qhov rais kub dua, tab sis qhov qis dua - nruab nrab txwv tseem qhia (xws li, 210℃~ 230℃rau PP) kom txo tau lub zog noj thiab thermal stress.
2. Kev tsim kho "Gradient Temperature Field" los tiv thaiv cov cua sov hauv zos
Teem tag nrho cov cheeb tsam kub rau tib tus nqi yog ib qho kev xav tsis zoo uas ua rau degradation. Kev teeb tsa kev tshawb fawb yuav tsum nthuav tawm cov gradient faib kom sib npaug ntawm cov dej ntws thiab cov keeb kwm thermal.
Manifold: Teem rau qhov ntsuas kub lossis qis me ntsis los ntawm 5℃~ 10℃.
Lub hauv paus ntsiab lus: Cov neeg khiav dej num muaj qhov ntim loj, thiab cov yas nyob ntawd ntev tshaj plaws. Qhov kub qis me ntsis tuaj yeem txo qhov kev pheej hmoo ntawm thermal decomposition vim qhov chaw nyob ntev, tshwj xeeb tshaj yog rau cov cua sov- cov ntaub ntawv rhiab heev xws li ABS.
Nose Lub Cev: Teem rau qhov ntsuas kub kom tswj tau cov khoom xa tuaj ruaj khov.
Lub qhov ntswg Tip/Gate: Teem rau qhov ntsuas kub +5℃~ 10℃. Lub hauv paus ntsiab lus: Thaum tshav kub kub dissipation yog ceev ntawm no; Cov cua sov tsim nyog tuaj yeem tiv thaiv cov khoom siv txias, tab sis cov cua sov ntau dhau yog txwv tsis pub. Yog tias qhov ntsuas kub siab tshaj qhov kub decomposition, nws yuav ncaj qha ua carbonization ntawm cov khoom ntawm lub rooj vag, uas ua rau cov pob dub txhaj rau hauv cov khoom.
3. nruj me ntsis tswj ob lub zais Killers: "Lub Sijhawm" thiab "Shear"
Dhau li ntawm qhov ntsuas kub, lub sijhawm thiab lub zog siv tshuab kuj tseem yog qhov tseem ceeb uas ua rau degradation, uas yuav tsum tau zam los ntawm kev hloov kho.
Minimize Residence Time:
Kev tswj kev cuam tshuam ntau lawm: Yog tias kev tsim khoom raug cuam tshuam (piv txwv li, pwm hloov pauv, kev debugging), thiab lub sijhawm dhau ntawm cov khoom siv tau tso cai (piv txwv li, ob peb feeb rau PVC, kwv yees li 10-15 feeb rau ABS), lub thoob yuav tsum tau muab pov tseg lossis qhov kub thiab txias txo kom muaj kev nyab xeeb (piv txwv li, 150℃). Nws yog nruj me ntsis txwv tsis pub rau lub yaj kom nyob twj ywm nyob rau hauv lub high-kub khiav rau "ci."
Cycle Optimization: Thaum ua kom muaj cua txias txaus, txhim kho kev tsim khoom thiab txo cov sij hawm nyob hauv tag nrho ntawm cov yaj hauv lub thoob thiab khiav.
Txo Shear Thaum tshav kub kub:
Screw Speed: Cov ntsia hlau ntau dhau ua kom muaj cua sov loj heev, ua rau qhov kub ntawm qhov kub ntawm qhov kub siab tshaj qhov kub thiab txias. Rau cov cua sov- cov ntaub ntawv rhiab heev, txo cov ntsia hlau ceev thiab tso siab rau cov cua sov sab nraud es tsis yog kev sib txhuam kub rau plasticization.
Kev tswj lub siab rov qab: Lub siab rov qab ntau dhau ua rau muaj kev sib txhuam sab hauv. Nws raug nquahu kom tswj lub nraub qaum siab ntawm 0.3 ~ 0.6 MPa, kom ntseeg tau tias tsuas yog cov yas yas thiab qhov cua, tsis txhob hla ntau dhau.
Kev txhaj tshuaj nrawm: Thaum hla lub qhov rooj nqaim, qhov siab siab -Kev txhaj tshuaj nrawm ua rau muaj kev sib tsoo siab, ua rau cov saw hlau molecular tawg. Kev txhaj tshuaj nrawm yuav tsum raug txo kom tsim nyog thaum tsis txhob muaj qhov sib tsoo.
4. Kev saib xyuas thiab saib xyuas cov khoom siv kho vajtse: tshem tawm "qhov kub tsis tseeb" thiab "qhov chaw tuag" Cov khoom siv tsis zoo feem ntau ua rau qhov ntsuas kub tsis zoo, ua rau muaj kev puas tsuaj.
Tshem tawm qhov chaw tuag: Tshawb xyuas qhov kub khiav qhov system tsim kom ntseeg tau tias tsis muaj qhov chaw nyob hauv tus neeg khiav dej num. Rau cov cua sov sab hauv, yog tias tus qauv tsim tsis tsim nyog, cov yaj yuav stagnate nruab nrab ntawm cov phab ntsa rwb thaiv tsev thiab cov cua sov shuttle, yooj yim carbonizing. Yog tias degradation tshwm sim ntau zaus, xav txog kev kho dua tshiab rau cov cua sov sab nraud lossis ua kom zoo dua qhov sib npaug ntawm cov neeg khiav dej num.
Sensor Calibration: Tsis tu ncua calibrate thermocouples kom ntseeg tau tias qhov kub thiab txias (PV) phim qhov kub ntawm qhov tseeb. Kev sib cuag sensor tsis zoo los yog kev sib raug zoo yuav ua rau qhov ntsuas kub qis dua li qhov ntsuas kub tiag tiag, uas tuaj yeem nyob deb tshaj qhov decomposition point.
Kev soj ntsuam tam sim no thiab kev kuaj mob: Siv cov kev ua haujlwm tam sim no ntawm lub thawv tswj qhov kub thiab txias los saib xyuas cov cua sov coil txheej xwm. Tsis zoo li tam sim no nyob rau hauv ib qho chaw yuav ua rau muaj cua sov tsis sib xws, overheating hauv zos, thiab degradation.
5. Kev Tiv Thaiv Tshwj Xeeb Thaum Pib- nce thiab kaw
Txias Pib: Ib txwm siv lub soft start functions, cua sov nyob rau hauv cov theem (xws li, thawj tswj ntawm 150℃rau dehumidification, ces nce mus rau kev khiav hauj lwm kub) kom tsis txhob overheating nyob rau hauv lub zos overheating tshwm sim los ntawm tag nrho cov hwj chim tso tawm ntawm lub cua sov kauj.
Kev Tiv Thaiv Kev Tiv Thaiv: Ua ntej kawg ntawm kev tsim khoom, siv tus neeg saib xyuas tu (xws li PE lossis tus neeg saib xyuas tshwj xeeb) kom tshem tawm cov cua sov- cov ntaub ntawv rhiab heev (xws li PC, ABS) los ntawm cov dej ntws los tiv thaiv cov khoom seem ntawm carbonizing thiab txhaws cov dej ntws vim cua sov ntev thaum lub sijhawm pib tom ntej.
