Peb txhua tus paub tias cov khoom yas feem ntau muaj qhov nrawm nrawm, thiab nws ntswj thaum nws qis dua. Cov khoom ua los ntawm cov ntaub ntawv sib txawv muaj qhov nrawm nrawm sib txawv. Ntawm no, peb tham txog ntau yam uas cuam tshuam rau qhov ntswj ntawm cov yas tig thaum lub sijhawm tsim khoom. Qhov tseeb, hauv kev tsim khoom, yog tias koj xav kom qhov loj ntawm cov khoom tsim nyog dua, nws yog qhov pab tau kom nkag siab txog cov yam ntxwv uas cuam tshuam rau qhov ntswj. Tom qab tag nrho, hauv kev lag luam logistics, cov thawv yas tig feem ntau yog cov thawv txheem txheem. Nws qhov loj me thiab cov lus qhia yog qhov tseeb raws li tus qauv, thiab tsis muaj kev hloov pauv. Txwv tsis pub, nws tsis tuaj yeem hais tias qhov kev dav dav yog tus qauv.
Cov txheej txheem molding ntawm lublub thawv yas tig rov qabyog cov thermoplastic molding. Vim yog qhov hloov pauv ntawm qhov ntim thaum lub sijhawm tsim khoom hauv cov txheej txheem crystallization, qhov kev ntxhov siab sab hauv yog qhov loj heev, thiab muaj qhov kev ntxhov siab seem hauv cov khoom pwm, thiab qhov kev taw qhia molecular muaj zog heev. Yog li ntawd, nws muaj qhov nrawm dua li cov khoom thermosetting plastics. Nws muaj qhov sib txawv loj dua thiab qhov kev taw qhia meej heev. Txij li thaum txheej sab nraud ntawm cov khoom siv molten nyob rau hauv kev sib cuag nrog qhov pwm qhov chaw thaum lub sijhawm molded yas Cheebtsam, nws tam sim ntawd txias kom tsim lub plhaub khoom qis-density. Thiab peb txhua tus paub tias qhov thermal conductivity ntawm yas yog pluag heev, thiab txheej sab hauv ntawm lub thawv yas tig txias qeeb heev, tsim cov txheej khoom siab-density nrog qhov nrawm loj shrinkage. Yog tias phab ntsa tuab qeeb, cov txheej siab-density yuav tuab thiab yuav ntsws ntau dua.
Cov txheej txheem molding ntawm lublub thawv yas tig rov qabyog cov thermoplastic molding. Vim yog qhov hloov pauv ntawm qhov ntim thaum lub sijhawm tsim khoom hauv cov txheej txheem crystallization, qhov kev ntxhov siab sab hauv yog qhov loj heev, thiab muaj qhov kev ntxhov siab seem hauv cov khoom pwm, thiab qhov kev taw qhia molecular muaj zog heev. Yog li ntawd, nws muaj qhov nrawm dua li cov khoom thermosetting plastics. Nws muaj qhov sib txawv loj dua thiab qhov kev taw qhia meej heev. Txij li thaum txheej sab nraud ntawm cov khoom siv molten nyob rau hauv kev sib cuag nrog qhov pwm qhov chaw thaum lub sijhawm molded yas Cheebtsam, nws tam sim ntawd txias kom tsim lub plhaub khoom qis-density. Thiab peb txhua tus paub tias qhov thermal conductivity ntawm yas yog pluag heev, thiab txheej sab hauv ntawm lub thawv yas tig txias qeeb heev, tsim cov txheej khoom siab-density nrog qhov nrawm loj shrinkage. Yog tias phab ntsa tuab qeeb, cov txheej siab-density yuav tuab thiab yuav ntsws ntau dua.
Daim ntawv qhia chaw nres nkoj ntawm cov khoom siv ntau lawm 'qhov loj me ntawm cov khoom siv raw khoom faib thiab lwm yam yuav cuam tshuam ncaj qha rau kev coj ntawm cov dej ntws, kev faib cov khoom siv ntom ntom, kev tiv thaiv siab thiab lub sijhawm molding, cuam tshuam tsis ncaj qha rau qhov nrawm ntawmlub thawv yas tig rov qab.Thaum cov khoom siv muaj qhov nkag ncaj qha, qhov seem ntawm qhov nkag loj heev, tshwj xeeb tshaj yog thaum nws tuab dua, qhov nrawm yuav me dua tab sis muaj kev taw qhia ntau dua. Hauv kev sib piv, thaum qhov loj me ntawm qhov nkag me me, qhov kev taw qhia qis me me, thiab qhov nrawm nrawm yog qhov loj dua thaum qhov nkag ze rau qhov nkag lossis sib luag rau qhov kev taw qhia ntws.
Cov xwm txheej molding ntau lawm muaj kev cuam tshuam loj heev rau qhov shrinkage ntawmlub thawv yas tig rov qabPiv txwv li, yog tias qhov kub ntawm pwm siab thiab cov khoom siv molten qeeb qeeb, muaj qhov ceev siab thiab qhov nrawm yuav loj heev. Cov khoom siv crystalline muaj qhov crystallinity siab thiab ntim loj, yog li qhov nrawm nrawm dua. Qhov faib tawm ntawm qhov kub ntawm pwm thiab qhov txias sab hauv thiab sab nraud thiab qhov ceev ntawm cov khoom yas yuav cuam tshuam ncaj qha rau qhov nrawm thiab kev coj ntawm txhua qhov ntawm cov khoom. Qhov loj ntawm qhov tuav siab thiab lub sijhawm ntev kuj muaj kev cuam tshuam loj rau qhov nrawm. Thaum qhov siab siab thiab ntev, qhov nrawm me dua, tab sis qhov kev coj ua ntau dua. Thaum lub sijhawm molding, qhov nrawm ntawm lub thawv yas tig tuaj yeem hloov pauv kom raug los ntawm kev kho qhov kub thiab siab ntawm pwm thiab lub sijhawm txias. Raws li saum toj no, peb tuaj yeem txiav txim siab qhov nrawm ntawm txhua qhov ntawm cov khoom raws li lub thawv yas tig, qhov tuab ntawm phab ntsa, cov duab, qhov nkag, cov duab thiab qhov loj me thiab kev faib tawm ntawm cov qauv pwm, thiab tom qab ntawd xam qhov loj ntawm qhov. Raws li qhov nrawm ntawm cov khoom, hloov pwm thiab hloov cov xwm txheej txhaj tshuaj molding kom kho qhov nrawm ntawm cov khoom kom tau raws li qhov xav tau tiag tiag.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-25-2022