Kev tsim kho ntawm cov khoom no yuav tsum sib tov nrog cov dej haus hauv tsev, nrog rau cov dej tsim nyog ntxiv ntawm 3.6% mus rau 4.6%. Qhov zoo tshaj plaws kev tsim kho ib puag ncig kub yog 5 degree -25 degree .
Ib, kev npaj kev tsim kho
1.1 Cov pwm yuav tsum raug ntsia kom raug raws li kev tsim kho. Cov pwm tuaj yeem ua los ntawm 3-6mm steel daim hlau lossis 12-25m ntoo boards. Tag nrho cov molding pwm yuav tsum tiaj tus, xeb pov thawj, thiab tsis muaj lwm yam impurities adhering rau qhov chaw ua hauj lwm. Cov phaj hlau tuaj yeem kho tau los ntawm qhov chaw vuam, thiab cov rooj ntoo ntoo tuaj yeem kho nrog cov ntsia hlau, cov pas nrig sab saum toj, thiab cov hlau hlau. Qhov sib txawv yuav tsum tau tswj kom tsawg, thiab yuav tsum tsis txhob muaj cov khoom to los yog slurry to. Cov khoom siv thauj khoom tau ruaj khov, thiab txhua qhov chaw uas tuaj yeem nqus dej tau yooj yim hauv kev sib cuag nrog cov khoom siv casting (cov txheej txheem rwb thaiv tsev) thiab cov khoom thauj khoom yuav tsum tau txais kev kho dej los tiv thaiv. Qhov saum npoo ntawm lub template nyob rau hauv kev sib cuag nrog cov khoom pouring yuav tsum tau coated nrog tso tawm neeg sawv cev xws li muaj roj kom tsis txhob adhesion ntawm lub pouring khoom thiab cov hlau phaj thaum demolding.
1.2 Kev nthuav dav cov pob qij txha yuav tsum nruj me ntsis raws li cov qauv tsim. Thaum tsis muaj tus qauv tsim, lawv yuav tsum tau teem rau ntawm qhov deb ntawm 1.5-2mm. Lub pouring nyob rau hauv me me cheeb tsam muab faib los ntawm expansion sib koom ua ke yuav tsum tau ua kom tiav nyob rau hauv ib tug nruam pouring, thiab lub pouring cheeb tsam yuav tsum tsis txhob yuav tsum tau nres nyob rau hauv ib nrab ua ntej lub pouring tiav.
2, sib tov thiab pouring
2.1 Sib tov: Ncuav rau hauv cov khoom sib xyaw thiab cov hnab ntim me me hauv lub xeev qhuav thiab premix rau 2 feeb, ces maj mam ntxiv dej kom ncav cuag cov dej uas tsim nyog. Npog ntub dej li ntawm 1-2 feeb (ceeb toom: cov dej sib tov ntau dhau yuav ua rau los ntshav thiab sib cais ntawm cov ntaub ntawv zoo thiab cov khoom sib sau ua ke, ua rau muaj qhov txo qis hauv lub zog ntawm cov khoom siv ntxiv). Saib xyuas qhov qeeb deformation, tawg, thiab ntws ntawm cov av nkos hauv lub lauj kaub. Yog tias qhov sib piv yog qhov tsim nyog thiab qhov sib tov zoo, cov khoom tuaj yeem raug tshem tawm thiab nchuav. (Ceeb Toom: Tsis txhob sib xyaw ua ke ntev vim tias cov khoom yuav nplaum thiab cuam tshuam rau cov dej ntws, ua kom nrawm nrawm nrawm).
2.2 Pouring thiab vibrating: Muab cov khoom sib xyaw ua ke rau hauv lub template kom sai li sai tau, thiab pib vibrating hauv qab kom txog thaum tag nrho cov huab cua tawm. Lub vibrating pas nrig yuav tsum nyob rau hauv ib qho chaw li 10 vib nas this, thiab ceev faj kom rub tawm maj mam kom ntseeg tau tias qhov kev vibration yog ntom, lub ncuav nto yog tiaj tus, thiab tsis muaj kev sib cais los yog los ntshav, qhia tau tias zoo molding.
3, Static curing ntawm pouring cov ntaub ntawv
3.1 Nyob rau hauv ib txwm kub kub: lub sij hawm hardening ntawm cov khoom pouring yuav tsum tsis txhob tsawg tshaj li 12 teev, thiab cov pwm yuav tsum demolded 24 teev tom qab pouring. Yog hais tias lub ntim ntim loj los yog qhov kub ntawm qhov nruab nrab qis, lub sijhawm kho thiab lub sijhawm demolding yuav tsum raug ncua kom tsim nyog.
3.2 Thaum lub ambient kub yog siab tshaj los yog sib npaug rau 25 degree, tom qab lub pouring ntawm cov khoom pouring tiav thiab ua ntej hardening, nws yog tsim nyog los tiv thaiv lub ceev ceev evaporation ntawm cov dej los ntawm qhov ua rau qhov tsawg kawg teeb lub zog ntawm cov khoom pouring. Ib txheej nyias ntawm cov yas los yog cov nyom ntub dej tuaj yeem npog rau saum npoo ntawm cov khoom siv rau kev kho
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