Dab tsi yog kev ceev faj rau kev ua cov khoom siv PC rau hauv cov khoom tiav?
Cov khoom twg ua tau raws li cov kev xav tau ntawm cov neeg siv khoom thiab qhia txog peb cov khoom sib tw? Peb tau tshawb fawb hauv online platforms thiab pom tias cov khoom siv PC ua tau zoo heev, xws li lub hnub ci visors, basketball boards, lampshades, shields, thiab lwm yam.
Kev tsim cov khoom lag luam feem ntau yog nyob ntawm pwm. Ntev npaum li cov pwm tsim, qhov kev xav tau ntawm cov khoom yog txaus. Tab sis qhov mob taub hau tshaj plaws hauv cov txheej txheem tsim khoom yog tias kev ua haujlwm yuav tsum tau saib xyuas ntau cov ntsiab lus, txwv tsis pub cov khoom tsim tawm yuav raug deformed lossis tsis ua raws li cov qauv peb xav tau. Yog li, cov ntsiab lus dab tsi peb yuav tsum tau them sai sai rau hauv cov txheej txheem tsim khoom? Peb tau sau txog kaum qhov kev txiav txim siab saum toj kawg nkaus.
Thawj daim ntawv: qhuav raw khoom
PC plastics, txawm tias thaum raug cov dej noo tsawg heev, tuaj yeem ua rau hydrolysis kom tawg cov ntawv cog lus, txo qhov hnyav molecular, thiab txo lub zog lub cev. Yog li ntawd, ua ntej txheej txheem molding, cov dej noo ntawm polycarbonate yuav tsum nruj me ntsis tswj kom qis dua 0.02%.
Daim ntawv thib ob: Kev txhaj tshuaj kub
Feem ntau, qhov kub ntawm 270 ~320 ℃ yog xaiv rau molding. Yog tias cov khoom kub siab tshaj 340 ℃ , PC yuav decompose, cov xim ntawm cov khoom yuav darken, thiab tsis xws luag xws li nyiaj hlau, tsaus kab txaij, dub me ntsis, thiab npuas yuav tshwm nyob rau saum npoo. Nyob rau tib lub sijhawm, cov khoom siv lub cev thiab cov khoom siv kho tshuab kuj tseem yuav txo qis.
Daim ntawv thib peb: txhaj tshuaj
Lub cev thiab txhua yam khoom, kev ntxhov siab sab hauv, thiab molding shrinkage ntawm PC khoom muaj qee yam cuam tshuam rau lawv cov tsos thiab demolding zog. 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.
Fourth note: Tuav siab thiab tuav lub sijhawm
Qhov loj ntawm lub zog tuav thiab lub sijhawm tuav lub sijhawm muaj kev cuam tshuam loj rau kev ntxhov siab sab hauv ntawm cov khoom PC. Yog hais tias lub siab tsawg dhau lawm thiab cov nyhuv shrinkage me me, lub tshuab nqus tsev npuas los yog deg indentations yuav tshwm sim. Yog tias lub siab siab dhau lawm, qhov tseem ceeb hauv kev ntxhov siab yuav raug tsim nyob ib ncig ntawm lub sprue. Hauv kev ua tiav, cov khoom siv kub thiab tsis tshua muaj siab yog feem ntau siv los daws qhov teeb meem no.
Fifth nco: Txhaj ceev
Tsis muaj qhov cuam tshuam loj heev rau kev ua haujlwm ntawm cov khoom siv PC, tsuas yog rau nyias-walled, lub rooj vag me me, qhov tob tob, thiab cov txheej txheem ntev. Feem ntau, kev ua haujlwm nruab nrab lossis qeeb qeeb yog siv, thiab kev txhaj tshuaj ntau theem yog nyiam, feem ntau yog siv txoj kev txhaj tshuaj qeeb qeeb qeeb ntau theem.
Daim ntawv thib rau: Pwm kub
85~120 ℃ , feem ntau tswj ntawm 80-100 ℃ . Rau cov khoom uas muaj cov duab complex, nyias thickness, thiab siab yuav tsum tau, nws kuj yuav nce mus rau 100-120 ℃ , tab sis nws tsis tuaj yeem tshaj qhov kub deformation ntawm pwm.
Lub cim thib xya: ntsia hlau nrawm thiab rov qab siab
Vim lub siab viscosity ntawm PC yaj, nws muaj txiaj ntsig zoo rau plasticization, tso tawm, thiab kev saib xyuas ntawm lub tshuab plasticizing los tiv thaiv 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, thiab lub siab rov qab yuav tsum tswj ntawm 10-15% ntawm kev txhaj tshuaj.
Lus Cim Yim: Kev siv cov tshuaj ntxiv
Thaum lub sij hawm txhaj tshuaj molding txheej txheem ntawm PC, kev siv cov neeg ua hauj lwm tso tawm yuav tsum nruj me ntsis tswj, thiab siv cov ntaub ntawv rov qab yuav tsum tsis txhob ntau tshaj peb zaug, nrog rau kev siv tus nqi ntawm 20%.
Lub Cuaj Hlis: PC txhaj tshuaj molding muaj qhov xav tau siab rau pwm:
Tsim raws li tuab thiab luv li sai tau, nrog tsawg kawg yog dabtsi yog khoov, thiab siv lub voj voog hla-section diversion raws thiab channel sib tsoo thiab polishing kom txo tau qhov ntws tsis kam ntawm cov khoom molten. Lub rooj vag txhaj tshuaj tuaj yeem siv txhua hom rooj vag, tab sis txoj kab uas hla ntawm qhov dej nkag yuav tsum tsis pub tsawg dua 1.5 hli.
Daim ntawv thib kaum: Cov kev xav tau rau cov tshuab yas siv hauv kev tsim cov khoom PC:
Qhov siab tshaj plaws txhaj tshuaj ntim ntawm cov khoom yuav tsum tsis txhob ntau tshaj 70-80% ntawm nominal txhaj ntim; Lub clamping siab yog li ntawm 0.47 txog 0.78 tons ib square centimeter ntawm qhov projected cheeb tsam ntawm cov khoom tiav; Qhov zoo ntawm lub tshuab yog li 40 mus rau 60% ntawm lub peev xwm ntawm lub tshuab txhaj tshuaj molding raws li qhov hnyav ntawm cov khoom tiav. Qhov tsawg kawg nkaus qhov ntev ntawm cov ntsia hlau yuav tsum yog 15 diameters ntev, nrog rau L / D piv ntawm 20: 1 yog qhov zoo.
Kev tsim nyog thiab ua tau zoo yog qhov tsim nyog los ua kom muaj txiaj ntsig zoo ntawm cov khoom tiav. Muab cov neeg siv khoom xaiv ntau dua.