Cov cuab yeej cuab tam ntawm precision castings yog siab dua cov cam khwb cia hlau, tab sis lawv cov khoom pov thawj yog phem dua li cov cam khwb cia hlau. Vim hais tias lub melting point ntawm stainless hlau precision castings yog siab, cov kua hlau yog ib qho yooj yim mus oxidize, lub fluidity ntawm molten hlau tsis zoo, thiab lub shrinkage yog loj, nws ntim shrinkage yog 10 ~ 14%, thiab linear shrinkage yog 1.8 ~ 2.5%. Txhawm rau tiv thaiv qhov tsis xws ntawm cov hlau castings xws li tsis txaus pouring, txias kaw, shrinkage kab noj hniav thiab porosity, tawg thiab xuab zeb sticking, ntau txoj kev ntsuas ntau tshaj cam khwb cia hlau yuav tsum tau noj:
Vim hais tias lub shrinkage ntawm stainless hlau precision castings yog ntau dua li cov cam khwb cia hlau, nyob rau hauv thiaj li yuav tiv thaiv shrinkage kab noj hniav thiab porosity defects, riser thiab, txias hlau thiab nyiaj pab feem ntau yog siv nyob rau hauv cov txheej txheem casting kom paub sequential solidification.
Vim tias qhov dej tsis zoo ntawm cov kua hlau tsis zoo, txhawm rau tiv thaiv cov rwb thaiv tsev txias thiab tsis txaus ntawm cov hlau castings, phab ntsa thickness ntawm cov hlau castings yuav tsum tsis pub tsawg tshaj 8 hli; Cov qauv ntawm lub rooj vag system ntawm precision castings yog yooj yim li sai tau, thiab seem loj yog loj dua li ntawm cam khwb cia hlau; Cov pwm qhuav lossis pwm kub yuav tsum tau txais yuav;
Ua kom qhov kub thiab txias, feem ntau yog 1520 ° ~ 1600 ℃, vim tias qhov kub thiab txias yog siab, lub superheat ntawm cov hlau molten loj, cov kua hauv lub xeev tau khaws cia rau lub sijhawm ntev, thiab cov fluidity tuaj yeem txhim kho. Txawm li cas los xij, yog tias qhov ntsuas kub siab dhau lawm, nws yuav ua rau muaj qhov tsis xws luag xws li cov nplej ntxhib, tawg kub, qhov pores thiab xuab zeb nplaum. Yog li ntawd, lub pouring kub ntawm me me, nyias-walled thiab complex castings yog hais txog lub melting point kub ntawm steel + 150 ℃;
Lub pouring kub ntawm loj thiab tuab phab ntsa castings yog hais txog 100 ℃ siab tshaj nws melting point
