Kev khiav hauj lwm cov hniav nyiaj hniav kub casting khoom pib nrog kev npaj kom raug. Ua ntej siv, xyuas kom meej tias cov khoom siv hluav taws xob, cua sov, lub tshuab nqus tsev, thiab cov chaw tswj tau ua haujlwm kom raug, thiab xyuas kom meej tias cov pwm, cov khoom siv casting, thiab cov cuab yeej pabcuam tau npaj txhij. Xaiv cov kev ua haujlwm tsim nyog- xws li qhov kub thiab txias, lub sijhawm cua sov, thiab hom casting-raws li cov khoom siv tshwj xeeb rau cov hniav nyiaj hniav kub los tsim kom muaj kev ruaj ntseg rau cov txheej txheem.
Thaum lub sijhawm ua haujlwm tiag tiag, muab cov ntaub ntawv hlau npaj rau hauv thaj chaw melting thiab teeb tsa qhov kub thiab txias raws li cov khoom siv kom ntseeg tau tias ua tiav melting thiab zoo fluidity. Thaum lub sij hawm nchuav, ua tib zoo tswj cov qib nqus, siab, lossis kev sib hloov ceev -nyob ntawm cov cuab yeej siv- kom ntseeg tau tias cov hlau molten puv cov pwm sai thiab sib npaug, yog li txo cov teeb meem xws li porosity, tsis tiav filling, thiab defects.
Thaum casting tiav, ua raws li cov txheej txheem rau kev txias thiab demolding. Tom qab lub casting nce mus txog qhov tsim nyog kub, tshem tawm nws los ntxuav thiab tshuaj xyuas, tshuaj xyuas cov kab nrib pleb, huab cua npuas, lossis molding imperfections. Yog tias muaj teeb meem raug kuaj pom, kho tam sim ntawm cov khoom siv thiab cov txheej txheem ua haujlwm txhawm rau txhim kho qhov zoo thiab cov txiaj ntsig ntawm cov khoom lag luam yav tom ntej.