Kev ceev faj hauv Polyurethane Rigid Foam Casting
Cov catalysts rau casting ua npuas ncauj molding yog tsuas yog amine catalysts. Ncua amine catalysts tuaj yeem siv los ua kom lub sijhawm ua kom dawb kom ua tau raws li qhov xav tau ntawm cov pwm. Hom catalyst no tuaj yeem txhim kho qhov fluidity ntawm cov khoom siv raw, tab sis tsis cuam tshuam rau nws cov curability. Isocyanate Qhov Performance index yog me ntsis siab dua 100, xws li 105. Nyob rau hauv cov txheej txheem ntawm pouring thiab foaming, raw khoom kub thiab qhov kub ntawm ambient kub ncaj qha cuam tshuam qhov zoo ntawm cov khoom yas foamed. Lub ambient kub yog qhov zoo dua 20-30 degree , thiab cov khoom siv kub tuaj yeem tswj tau ntawm 20-30 degree lossis siab dua me ntsis. Nws yog ib qho nyuaj kom tau txais cov khoom zoo yog tias qhov kub thiab txias siab dhau los yog qis dhau. Rau cov khoom loj xws li nkoj thiab tsheb, nws yog ib qho nyuaj rau tswj qhov kub thiab txias los ntawm qhov chaw casting.
Cov kev xav tau rau cov pwm yog cov qauv tsim nyog, yooj yim disassembly thiab sib dhos, lub teeb yuag, qee qhov kev ua haujlwm siab, thiab ua tiav zoo ntawm sab hauv. Nyob rau tib lub sijhawm, raws li qhov loj me thiab cov duab sib txawv ntawm cov pwm, laum ntau kab hauv cov haujlwm tsim nyog. Stoma. Cov khoom siv ua pwm feem ntau yog aluminium alloy, thiab qee zaum steel pwm yog siv. Qhov kub ntawm pwm ncaj qha cuam tshuam qhov ceev ntawm cov tshuaj tiv thaiv tshav kub tshem tawm. Cov pwm kub yog qhov tsawg, qhov sib piv foaming me me, cov khoom ntom ntom yog siab, thiab daim tawv nqaij yog tuab; siab pwm kub Ntawm qhov tsis sib xws. Txhawm rau ua cov khoom lag luam zoo foamed yas, pwm kub yog feem ntau tswj nyob rau hauv qhov ntau ntawm 40-50 degree . Thaum cov khoom kub thiab pwm kub tsis tshua muaj, cov tshuaj tiv thaiv ua haujlwm maj mam, thiab lub sijhawm ua npuas dej yog ntev; qhov kub yog siab, lub sij hawm kho yog luv. . Thaum foaming yog txhaj rau hauv pwm, pwm thiab cov khoom yuav tsum tau kho nyob rau hauv ib qho chaw kub dua ua ntej demoulding, kom cov tshuaj tiv thaiv tuaj yeem ua tiav. Yog tias demoulding ntxov ntxov, qhov curing yuav tsis txaus thiab ua npuas ncauj yuav deformed. Cov khoom siv raw Qhov ntau thiab cov duab thiab qhov loj ntawm qhov sib txawv, thiab qhov yuav tsum tau kho lub sij hawm thiab qhov kub thiab txias kuj txawv. Feem ntau, cov molded ua npuas ncauj yuav tsum tau kho nyob rau hauv lub pwm rau 10 feeb ua ntej nws yuav demolded. Vim lub sijhawm sib tov luv luv, kev sib xyaw ua haujlwm yog qhov yuav tsum tau them nyiaj rau. Los ntawm txhais tes pouring thiab foaming, lub stirrer yuav tsum muaj txaus lub hwj chim thiab kev sib hloov ceev. Kev sib xyaw yog zoo ib yam, lub hlwb ua npuas ncauj zoo thiab zoo ib yam, thiab qhov zoo yog qhov zoo; qhov sib tov tsis zoo, lub hlwb yog tuab thiab tsis sib xws, thiab txawm tias cov tshuaj muaj pes tsawg leeg tsis ua raws li cov qauv hauv ib cheeb tsam. Zoo heev cuam tshuam qhov zoo ntawm cov khoom.
