Ob Yam Txhim Kho Cov Haujlwm Thiab Daim Ntawv Pom Ntawm Cov Hlau Castings

Hlau castings yog siv rau tshuab qhov chaw uas yuav tsum muaj zog dua, yas thiab kev ua kom muaj zog. Nws cov zis yog thib ob tsuas yog cam khwb cia hlau, accounting rau txog 15% ntawm tag nrho cov castings.

Cov khoom lag luam ntawm cov hlau nrig yog siab tshaj qhov uas cov hlau cam, tab sis nws txoj kev ua haujlwm casting yog phem tshaj qhov uas raug muab hlau. Vim hais tias qhov chaw ntawm pob zeb tawg yog ntau dua, lub hlau uas yooj yim yog yooj yim oxidize, tus fluidity yog pluag, lub shrinkage loj heev, tus nqi cog lus yog 10 ~ 14%, cov kab shrinks mus 1.8 ~ 2.5%. Yuav kom tiv thaiv cov hlau casting defects xws li tsis txaus ntim, txias rwb thaiv tsev, shrinkage thiab shrinkage, nrib pleev thiab nplaum xuab zeb, nws yog tsim nyog yuav tau siv ntau txoj haujlwm kev ntsuas dua cam khwb cia hlau:

1. Vim cov neeg pluag tsis zoo ntawm cov hlau tawg, yuav kom tiv thaiv cov hlau castings los ntawm cov khoom cua txias thiab cov khoom tsis txaus, cov phab ntsa ntawm cov hlau cam tsis tuaj yeem tsis pub tsawg tshaj 8 hli, cov qauv ntawm cov cuab yeej yoojyim yog qhov yooj yim, thiab qhov ntsuas loj loj tshaj qhov uas muaj hlau, cam khwb qhuav los yog kub pwm siv, thiab qhov kub siab yog 1520 ° ~ 1600 ℃, vim tias qhov kub thiab txias Cov dej ntawm cov hlau phom tau tuaj yeem ua kom zoo dua los ntawm nws lub siab tawv thiab ntev ntawm kev ua kua. Tab sis lub qhov cub tawg yog siab, nws yuav ua rau muaj xws li ntxhib lis, kub ntaiv, pore thiab nplaum xuab zeb.

Yog li, qhov me me, nyias-walled thiab txoj kev zoo nkauj castings, lub cub tawg ntawm cov hlau yog hais txog lub melting point kub + 150 ℃, loj, tuab-walled castings casting kub tshaj nws cov melting taw tes ntawm 100 ℃ los yog li ntawd.

2, vim hais tias qhov kev sib tw ntawm cov hlau nrig yog ntau ntau tshaj hlau cam, kom tiv thaiv tau qhov casting shrinkage, shrinkage defects, feem ntau ntawm casting txheej txheem siv riser thiab, ntsawj txias thiab subsidies thiab lwm yam kev ntsuas kom tiav nruam solidification.

Tsis tas li ntawd, yuav kom tiv thaiv tau shrinkage, shrinkage thiab porosity ntawm cov hlau castings, porosity thiab tawg tsis xws yuav tsum yog yam ntsa tuab, tsis txhob ntse lub thiab txoj cai lub kaum sab xis, ntxiv sawdust hauv pwm hom xuab zeb, ntxiv coke hauv core, thiab adopt hollow cov tub ntxhais thiab cov roj xuab zeb los ua kom cov qoob loo thiab cov permeability ntawm xuab zeb los yog cov tub ntxhais.