Txhaj molding txheej txheem ntawm cov khoom siv PC thiab xaiv cov ntsia hlau
Tso lus
PC muaj kev ua tau zoo heev, siab transparency, zoo cuam tshuam toughness, creep kuj, thiab ntau yam kub. Cov txheej txheem ntawm PC yog: rhiab heev ntawm yaj viscosity rau shear tus nqi me me, tab sis qhov rhiab heev rau qhov kub thiab txias yog qhov loj, tsis muaj qhov pom tseeb melting point. Lub yaj viscosity yog siab, thiab cov resin yooj yim rau hydrolyze ntawm qhov kub thiab txias, ua rau cov khoom tawg yooj yim. Rau cov yam ntxwv no, peb yuav tsum tau xyuam xim tshwj xeeb rau kev paub qhov txawv thiab kho lawv sib txawv: txhawm rau ua kom cov dej ntws ntawm cov yaj, tsis yog los ntawm kev ua kom lub zog txhaj tshuaj, tab sis los ntawm kev txhaj tshuaj kub. Tus khiav thiab lub rooj vag ntawm cov pwm yuav tsum tau luv luv thiab tuab kom txo tau cov kua siab poob, thaum tseem yuav tsum tau txhaj tshuaj ntau dua. Ua ntej molding thiab ua tiav, cov resin yuav tsum tau kho kom qhuav kom txaus los tswj nws cov dej noo hauv qab 0.02 feem pua . Tsis tas li ntawd, kev ntsuas rwb thaiv tsev yuav tsum tau ua thaum lub sijhawm ua haujlwm los tiv thaiv kom tsis txhob rov ya raws. Tsis tsuas yog nws yuav tsum tau tsim cov khoom tsim nyog, tab sis nws tseem yuav tsum tau ua tus txheej txheem tsim kom raug, xws li nce pwm kub thiab tom qab ua tiav cov khoom, uas tuaj yeem txo lossis tshem tawm kev ntxhov siab sab hauv. Kho cov txheej txheem tsis raws sij hawm raws li qhov sib txawv ntawm cov khoom.
Txhaj tshuaj molding tshuab ntsia hlau (Jinyang ntsia hlau)
Tom ntej no, cia peb tham txog cov txheej txheem molding
1. Kev txhaj tshuaj kub yuav tsum coj mus rau hauv tus account cov duab, qhov loj, thiab pwm qauv ntawm cov khoom. Tsuas yog tom qab txiav txim siab qhov kev ua tau zoo thiab cov kev xav tau ntawm cov khoom tuaj yeem ua tau. Feem ntau, thaum molding, qhov kub ntawm qhov nruab nrab ntawm 270 ~ 320 degree. Yog tias cov khoom kub siab tshaj 340 degree, PC yuav decompose, cov xim ntawm cov khoom yuav tsaus, thiab cov teeb meem xws li nyiaj filaments, tsaus kab txaij, dub me ntsis, thiab npuas yuav tshwm nyob rau saum npoo. Nyob rau tib lub sijhawm, lub cev thiab cov khoom siv kho tshuab kuj tseem yuav txo qis.
2. Kev txhaj tshuaj siab muaj qee yam cuam tshuam rau lub cev thiab cov khoom siv kho tshuab, kev ntxhov siab sab hauv, molding shrinkage tus nqi, thiab lwm yam ntawm cov khoom siv PC, thiab muaj kev cuam tshuam loj rau cov tsos thiab demolding kev ua tau zoo ntawm cov khoom. Kev txhaj tshuaj tsawg dhau lossis siab dhau lawm tuaj yeem ua rau qee yam tsis xws luag hauv cov khoom. Feem ntau, kev txhaj tshuaj siab yog tswj ntawm 80-120MPa. Rau nyias-phab ntsa, txheej txheem ntev, cov duab nyuaj, thiab cov khoom siv rooj vag me me, txhawm rau kov yeej qhov kev tiv thaiv ntawm cov dej ntws tawm thiab ua kom lub sijhawm ua rau cov pwm kab noj hniav, Tsuas yog xaiv qhov kev txhaj tshuaj siab dua (120-145MPa). Txhawm rau kom tau txais qhov ua tiav thiab du nto ntawm cov khoom.
3. Qhov loj thiab ntev ntawm kev tuav lub siab thiab tuav lub sij hawm muaj kev cuam tshuam loj rau kev ntxhov siab sab hauv ntawm cov khoom PC. Yog tias qhov tuav lub siab me me dhau thiab cov nyhuv pub mis me me, nws yooj yim ua rau lub tshuab nqus tsev npuas los yog qhov chaw shrinkage. Yog tias qhov tuav lub siab loj dhau, nws yooj yim los tsim kom muaj kev ntxhov siab loj nyob ib ncig ntawm lub rooj vag. Hauv kev ua haujlwm tiag tiag, cov khoom siv kub siab thiab qis tuav yog feem ntau siv los daws qhov teeb meem no. Kev xaiv lub sijhawm tuav yuav tsum nyob ntawm qhov tuab ntawm cov khoom, qhov loj ntawm lub rooj vag, pwm kub, thiab lwm yam. Feem ntau, cov khoom me me thiab nyias tsis tas yuav tuav lub sijhawm ntev. Ntawm qhov tsis sib xws, cov khoom loj thiab tuab yuav tsum muaj lub sijhawm tuav ntev dua. Lub sijhawm tuav lub sijhawm ntev tuaj yeem txiav txim siab los ntawm kev sim lub sijhawm sib khi ntawm lub rooj vag.
4. Kev txhaj tshuaj nrawm tsis muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm cov khoom siv PC. Ntxiv rau cov phab ntsa nyias nyias, cov rooj vag me me, qhov sib sib zog nqus, thiab cov txheej txheem ntev, lawv feem ntau ua tiav ntawm qhov nruab nrab lossis qeeb qeeb, zoo dua los ntawm kev txhaj tshuaj ntau theem, feem ntau yog siv txoj kev txhaj tshuaj qeeb qeeb qeeb ntau theem.
5. Pwm kub. Feem ntau, nws tuaj yeem tswj tau ntawm 80-100 degree , thiab rau cov khoom uas muaj cov duab nyuaj, cov txheej nyias nyias, thiab cov kev xav tau siab, nws tuaj yeem raug tsa mus rau 100-120 degree , tab sis nws tsis tuaj yeem tshaj pwm kub deformation kub. .
6. Screw ceev thiab rov qab siab. Vim lub siab viscosity ntawm PC yaj, nws muaj txiaj ntsig zoo rau cov yas yas, tso tawm, thiab kev saib xyuas ntawm lub tshuab molding kom tsis txhob muaj cov ntsia hlau ntau dhau. Qhov yuav tsum tau rau cov ntsia hlau ceev yuav tsum tsis txhob siab dhau, feem ntau tswj ntawm 30-60r / min, thaum lub siab rov qab yuav tsum tswj ntawm 10-15 feem pua ntawm kev txhaj tshuaj.
7. Thaum lub sij hawm txhaj tshuaj molding txheej txheem ntawm PC, kev siv cov tshuaj tso tawm yuav tsum tau tswj nruj me ntsis, thiab kev siv cov khoom siv rov ua dua yuav tsum tsis txhob ntau tshaj peb zaug, nrog rau kev siv nyiaj li ntawm 20 feem pua.
Cov kev xav tau rau cov tshuab yas ua cov khoom PC: Qhov siab tshaj plaws txhaj tshuaj ntim ntawm cov khoom (xws li cov neeg khiav dej num, rooj vag, thiab lwm yam) yuav tsum tsis pub tshaj 70-80 feem pua ntawm cov nominal txhaj ntim. Cov ntsia hlau yuav tsum yog ib lub taub hau xov nrog lub suab sib npaug thiab maj mam compression hom ntsia hlau nrog lub nplhaib kos. Qhov ntev ntawm txoj kab uas hla L / D ntawm cov ntsia hlau yog 15-20, thiab qhov sib txawv ntawm qhov sib piv C / R yog 2-3.
