Lub ntsiab tseem ceeb cuam tshuam rau cov khoom siv hluav taws xob ntawm grey cam khwb cia hlau muaj xws li cua txias, kev kho superheat ntawm cov kua hlau, kev kho inoculation thiab cov yam ntxwv ntawm tus nqi.
1. Muaj ntau yam uas cuam tshuam rau qhov txias txias ntawm castings: phab ntsa thickness thiab qhov hnyav ntawm castings, hom khoom siv casting, pouring thiab hnyav, thiab lwm yam. Txij li cov phab ntsa tuab, qhov hnyav thiab cov qauv ntawm cov castings nyob ntawm qhov kev ua haujlwm thiab tsis tuaj yeem hloov tau ntawm qhov siab, lawv cov teebmeem ntawm lub koom haum yuav tsum raug coj mus rau hauv tus account thaum xaiv cov tshuaj muaj pes tsawg leeg.
2. Ntawm cov nyhuv ntawm superheating kev kho mob ntawm cov kua hlau, nce lub superheating kub ntawm cov kua hlau tuaj yeem:
① Ua kom cov ntsiab lus sib xyaw ua ke thiab txo cov graphite carbon cov ntsiab lus
② Fine graphite, thiab tsim cov dendrite number case,
③ Tshem tawm cov "keeb kwm" ntawm cov hlau cam khwb cia,
④ Txhim kho qhov sib xws ntawm cov qauv ntawm ntu ntawm cov casting,
⑤ yog qhov tsim nyog rau kev pub mis ntawm castings. Ib yam li ntawd, cov kua hlau rwb thaiv tsev kuj muaj qhov zoo sib xws ntawm cov kua hlau overheating.
3. Cov nyhuv ntawm inoculation kev kho mob yog ntxiv inoculant rau cov kua hlau ua ntej cov kua hlau nkag mus rau hauv pwm kab noj hniav kom hloov lub metallurgical lub xeev ntawm cov kua hlau, thiaj li mus txhim kho cov microstructure thiab cov khoom ntawm cov cam khwb cia hlau. Rau grey cam khwb cia hlau, inoculation kev kho mob yog kom tau A-hom graphite, pearlite matrix, zoo eutectic pab pawg neeg qauv, thiab txo cov nyiam ntawm dawb qhov nyob rau hauv lub nyias phab ntsa los yog kaum ntawm lub casting thiab rhiab heev rau lub casting phab ntsa thickness. Rau malleable cam khwb cia hlau, nws yog ua kom luv luv lub sij hawm annealing, ua rau kom cov phab ntsa tuab ntawm cov casting thiab txhim kho cov qauv ntawm cov qauv. Rau nodular cam khwb cia hlau, nws yog los txo cov dawb casting nyiam, txhim kho tus nqi nodulation thiab txhim kho lub roundness ntawm graphite.
4. Hauv kev tsim khoom tiag tiag, nws feem ntau pom tias hloov cov nqi hlau (xws li siv npua hlau los ntawm qhov chaw sib txawv lossis hloov qhov piv ntawm tus nqi, thiab lwm yam) thiab cov tshuaj muaj pes tsawg leeg zoo li tsis muaj kev hloov pauv ntawm cov hlau cam khwb cia. muaj cov koom haum sib txawv thiab kev ua tau zoo, uas qhia tau hais tias qhov xwm txheej ntawm cov khoom siv raw ncaj qha cuam tshuam rau qhov xwm ntawm cov hlau cam khwb cia nrog nws, hu ua cam khwb cia hlau: Txog rau qhov kawg no, kev siv cov kua hlau ntau ntxiv thiab siv ntau yam hlau. Cov khoom xyaw tuaj yeem tshem tawm qhov "kev ua tau zoo" thiab txhim kho cov qauv thiab cov khoom ntawm cam khwb cia hlau.
