Cov txheej txheem tseem ceeb parameter pawg
Cov xwm txheej tseem ceeb ntawm kev txhaj tshuaj molding txheej txheem suav nrog qhov kub thiab txias, siab thiab lub sijhawm ua haujlwm ntawm txhua qhov ntsuas, uas cuam tshuam rau plasticizing ntws thiab txias.
Nws tuaj yeem hais tau tias txhawm rau ua kom muaj txiaj ntsig zoo thiab ruaj khov ntawm cov khoom yas, cov xwm txheej tsim nyog yog cov txheej txheem tsis raug thiab ruaj khov.
Nyob rau hauv txoj cai, thaum kho cov txheej txheem tsis, cov txheej txheem tsis yuav tsum tau kho raws li nram no cov txheej txheem Thaum kho cov txheej txheem tsis, nyob rau hauv lub hauv paus ntsiab lus, raws li qhov kev txiav txim ntawm lub siab - lub sij hawm - kub los kho lub tshuab, yuav tsum tsis txhob hloov nyob rau tib lub sij hawm. sij hawm
Ob lossis ntau qhov kev txwv yuav tsum tsis txhob hloov pauv tib lub sijhawm txhawm rau txhawm rau tiv thaiv cov txheej txheem los ntawm flocculating thiab ua rau tsis ruaj tsis khov ntawm cov khoom yas.
Cov txheej txheem tseem ceeb ntawm kev txhaj tshuaj molding yog raws li hauv qab no.
(1) Kub kub
Lub melting kub yog ib qho tseem ceeb heev thiab qhov txhaj tshuaj lub tog raj kheej kub siv tsuas yog cov lus qhia. Cov kub yaj tuaj yeem ntsuas ntawm qhov txhaj tshuaj nozzle
los yog siv txoj kev txhaj tshuaj cua. Qhov kub thiab txias ntawm lub tog raj kheej txhaj tshuaj yog nyob ntawm qhov kub thiab txias, ntsia hlau ceev, rov qab siab, ntim ntim thiab txhaj tshuaj.
rov qab siab, txhaj tshuaj ntim thiab txhaj tshuaj voj voog. Yog tias koj tsis muaj kev paub dhau los hauv kev ua cov qib tshwj xeeb ntawm cov yas, koj yuav tsum pib nrog qhov chaw qis tshaj.
Pib nrog qhov chaw qis tshaj plaws. Lub tog raj kheej txhaj tshuaj tau muab faib ua ib cheeb tsam kom tswj tau yooj yim, tab sis tsis yog txhua tus tau teem rau tib qhov kub thiab txias. Yog ua haujlwm
Yog tias ua haujlwm rau lub sijhawm ntev lossis qhov kub thiab txias, qhov kub ntawm thawj cheeb tsam yuav tsum tau teem rau tus nqi qis dua, vim qhov no yuav tiv thaiv kev tawg ntxov ntxov thiab kev sib txawv ntawm cov yas.
Qhov no yuav tiv thaiv tau ntxov melting thiab shunting ntawm cov yas. Xyuas kom tseeb tias cov kua dej hydraulic, hopper closers, pwm thiab txhaj tshuaj cylinders nyob ntawm qhov kub thiab txias ua ntej kev txhaj tshuaj pib.
ua ntej txhaj tshuaj pib. Lub thoob kub feem ntau yog nce zuj zus los ntawm sab nraub qaum mus rau pem hauv ntej kom tso cai rau cov yas zoo li qub.
(2) Melt kub
Melt kub plays lub luag hauj lwm tseem ceeb nyob rau hauv fluidity ntawm cov yaj, yas tsis muaj ib tug tshwj xeeb melting point, lub thiaj li hu ua melting point.
Lub xeev molten ntawm qhov kub thiab txias, cov qauv thiab muaj pes tsawg leeg ntawm cov yas molecular saw sib txawv, thiab yog li cuam tshuam rau nws cov liquidity.
Tsis tas li ntawd sib txawv, nruj molecular saw los ntawm qhov kub thiab txias yog pom tseeb dua, xws li PC, PPS, thiab lwm yam, thaum lub sij hawm hloov pauv molecular saw xws li PA, PP, PE
Lub fluidity tsis pom tseeb los ntawm kev hloov qhov kub, yog li qhov tsim nyog txhaj tshuaj kub yuav tsum tau kho raws li cov khoom sib txawv.
(3) Pwm kub
Qee cov ntaub ntawv yas xav tau pwm siab dua vim qhov kub ntawm crystallization siab thiab qeeb crystallization ceev, qee qhov xav tau pwm siab dua vim kev tswj qhov loj thiab deformation, lossis pwm tso tawm.
Qhov loj thiab deformation, los yog qhov xav tau ntawm pwm tso tawm, mus rau qhov kub thiab txias, xws li PC feem ntau xav tau ntau tshaj 60 degree.
Thiab PPS thiaj li ua tiav cov tsos zoo dua thiab txhim kho qhov ntws, pwm kub qee zaum yuav tsum tau ntau tshaj 160 degree, thiab yog li pwm kub los txhim kho cov tsos ntawm cov khoom, deformation, thiab cov khoom tsis zoo ib yam.
Qhov kub ntawm cov pwm los txhim kho cov tsos ntawm cov khoom, deformation, loj, pwm thiab lwm yam ntawm lub luag hauj lwm yuav tsis underestimated. Hauv pwm tsim thiab
Nyob rau hauv cov pwm tsim thiab molding txheej txheem, nws yog ib qho tseem ceeb tsis tsuas yog yuav tsum tswj kom zoo kub tab sis kuj yuav faib nws tusyees.
Cov pwm pwm tsis sib xws tuaj yeem ua rau qhov tsis sib xws thiab kev ntxhov siab sab hauv, yog li ua rau cov khoom pwm tuaj yeem ua rau deformation thiab warpage.
warping.
Qhov kub ntawm cov pwm cuam tshuam tus nqi ntawm hardening ntawm cov yas nyob rau hauv lub pwm kab noj hniav, tsawg heev yuav ua rau filling nyuaj thiab tsis zoo.
Tsawg dhau lawm yuav ua rau txhaws nyuaj thiab tawv tsis muaj qhov shrinkage (los yog recrystallization), ua rau cov khoom molded muaj ntau qhov txhaws thiab seem thermal stress; siab dhau lawm yuav qhia burrs thiab xav tau lub sij hawm ntev.
Yog tias qhov kub ntawm pwm siab dhau lawm, yuav muaj burrs thiab lub sijhawm txias dua. Cov pwm kub muaj qhov cuam tshuam zoo rau kev ua haujlwm sab hauv thiab kev ua haujlwm zoo ntawm cov pwm pwm.
Rau cov khoom yas nrog qhov xav tau ntawm qhov chaw siab, qhov pwm kub yuav tsum tau siab dua.
(4) Txhaj siab
Qhov kev tiv thaiv yuav tsum tau rau lub yaj kom kov yeej qhov kev nce qib ncaj qha cuam tshuam qhov loj, qhov hnyav thiab deformation ntawm cov khoom.
Cov khoom siv yas sib txawv yuav tsum muaj kev txhaj tshuaj sib txawv, rau cov khoom siv xws li PA, PP, thiab lwm yam, qhov siab ntxiv yuav ua rau nws cov dej tau zoo tuaj.
Qhov kev txhaj tshuaj siab loj txiav txim siab qhov ntom ntawm cov khoom, piv txwv li cov tsos ntawm glossiness. Nws tsis muaj tus nqi ruaj khov, thiab qhov nyuaj dua nws yog txhawm rau sau cov pwm, qhov kev txhaj tshuaj ntau dua.
qhov nyuaj dua, qhov kev txhaj tshuaj siab kuj nce ntxiv. Qhov chaw txhaj tshuaj yog qhov tseem ceeb los tswj cov roj siab kom nws txaus los thawb lub hau ntswj kom ncav cuag qhov kev txhaj tshuaj nrawm.
Lub siab txhaj tshuaj yog teem kom cov roj siab txaus los thawb lub hau ntswj mus rau qhov kev txhaj tshuaj ceev. Raws li cov yam ntxwv ntawm txhua cov yas sib txawv, cov degree ntawm kev yooj yim ntawm kev khiav kuj txawv.
Lub melting kub ntawm tib cov khoom sib txawv thiab cov viscosity kuj yuav hloov, thiab cov khoom sib txawv, pwm tsim thiab pwm kub yuav ua rau cov khoom.
Txhawm rau kom tswj tau qhov kev txhaj tshuaj zoo tib yam hauv cov xwm txheej sib txawv, peb yuav tsum hloov qhov kev txhaj tshuaj kom kov yeej qhov kev tiv thaiv los ntawm cov dej ntws.
Txhawm rau kom tswj tau qhov kev txhaj tshuaj tib yam nyob rau hauv cov xwm txheej sib txawv, kev txhaj tshuaj yuav tsum tau hloov pauv kom kov yeej qhov kev tawm tsam los ntawm cov yaj ntws. Kev txhaj tshuaj siab txawv ntawm kev tuav lub siab nyob rau hauv qhov kev txhaj tshuaj siab feem ntau cuam tshuam rau theem filling, thaum tuav lub siab sib txawv.
yog lub sijhawm filling, thaum tuav lub siab cuam tshuam rau lub caij txias.
Rau cov yas uas tsis muaj dej ntws tsis zoo, kev txhaj tshuaj yuav tsum loj, thiab rau cov roj hmab nyias nyias nrog cov kab noj hniav tsis zoo, qhov kev txhaj tshuaj hardness
quab yuam kuj yuav tsum coj tus nqi siab tshaj plaws.
(5) Kev txhaj tshuaj nrawm
Kev txhaj tshuaj nrawm yog teem los tswj lub sijhawm yaj lub sijhawm thiab cov qauv ntws, uas yog qhov tseem ceeb tshaj plaws hauv cov txheej txheem ntws.
Nws yog qhov tseem ceeb tshaj plaws hauv cov txheej txheem ntws. Kev kho kom raug ntawm kev txhaj tshuaj nrawm muaj qhov cuam tshuam rau qhov zoo ntawm cov khoom zoo li.
Lub hauv paus ntsiab lus ntawm kev txhaj tshuaj ceev yog kom phim cov ndlwg ntawm cov yas hauv pwm kab noj hniav raws li qhov loj ntawm cov seem tsim los ntawm qhov ntws.
Lub hauv paus ntsiab lus ntawm kev txhaj tshuaj ceev yog kom phim qhov luaj li cas ntawm cov ntoo khaub lig uas tsim los ntawm cov ndlwg ntawm cov yas nyob rau hauv lub pwm kab noj hniav, thiab ua raws li cov txheej txheem ntawm qeeb → ceev → qeeb thiab sai li sai tau (kom paub meej tias cov tsos ntawm tsis xws luag. ).
Kev txhaj tshuaj nrawm yog ua tiav los ntawm kev kho cov roj nkag mus rau lub tog raj kheej txhaj tshuaj ib chav tsev ntawm lub sijhawm, thiab feem ntau hais lus (tsis ua rau muaj kev phiv) siv ntau li ntau tau.
Feem ntau hais lus (tsis ua rau muaj kev phiv), sim siv cov kev txhaj tshuaj siab kom ntseeg tau tias lub zog fusion thiab pom zoo ntawm qhov molded, thaum qhov tsawg.
Qhov tsis tshua muaj siab kuj txo qhov kev ntxhov siab sab hauv ntawm cov yas thiab txhim kho lub zog. Kev siv cov kev kub siab thiab qis qis qis tuaj yeem ua rau tus nqi ntws zoo thiab
Lub shearing ceev yog me me, qhov luaj li cas ntawm cov yas yog ruaj khov, thiab lub shrinkage tsis xws luag yog zam.
(6) Lub Sijhawm Parameter (Lub voj voog molding)
Lub sijhawm txhaj tshuaj thiab lub sijhawm txias yog cov khoom siv tseem ceeb, thiab lawv qhov ntev muaj kev txiav txim siab ntawm qhov zoo ntawm kev txhaj tshuaj molded qhov chaw.
Lub sij hawm ntim pwm feem ntau tsis ntau tshaj 10s. Lub sij hawm tuav yog ntev dua thiab muaj feem xyuam rau cov phab ntsa thickness ntawm cov yas (phab ntsa thickness yog siv rau lub sij hawm ntev) los xyuas kom meej qhov tsawg kawg nkaus shrinkage.
Lub sij hawm tuav yog ntev dua thiab muaj feem xyuam rau phab ntsa thickness (phab ntsa thickness yuav siv sij hawm ntev) los xyuas kom meej qhov tsawg kawg nkaus shrinkage. Lub sijhawm txias yog nyob ntawm crystallinity ntawm cov yas, thickness ntawm cov khoom, qhov kub thiab txias ntawm pwm thiab lwm yam, nyob ntawm seb qhov xwm txheej tshwj xeeb.
Lub sijhawm txias yog nyob ntawm crystallinity ntawm cov yas, thickness ntawm cov khoom, qhov kub thiab txias ntawm pwm thiab lwm yam, nyob ntawm seb qhov xwm txheej tshwj xeeb.