Ob qho tib si grey hlau thiab ductile hlau tuaj yeem nrum los ntawmxuab zeb casting txheej txheem, plhaub molding casting txheej txheem (cov cob coated xuab zeb), poob ua npuas ncauj casting, nqus casting thiab peev casting. Xuab zeb casting yog ib qho nrov tshaj plaws thiab yooj yim tshaj plaws ntawm casting. Xuab zeb casting tso cai rau cov khoom me me dua li cov pwm pwm tas li thiab ntawm tus nqi tsim nyog heev. Tsis tsuas yog txoj kev no tso cai rau cov tuam txhab tsim cov khoom ntawm tus nqi qis, tab sis muaj lwm yam txiaj ntsig rau cov xuab zeb casting, xws li kev ua haujlwm me me. Xuab zeb casting kuj tso cai rau cov hlau feem ntau raug cam, nyob ntawm seb hom xuab zeb siv rau pwm. Plhaub molding casting txheej txheem tseem hu ua pre-coated resin xuab zeb casting txheej txheem, kub plhaub molding castings los yog core casting txheej txheem. Lub ntsiab molding khoom yog pre-coated phenolic resin xuab zeb, uas yog kim tshaj li ntsuab xuab zeb thiab furan resin xuab zeb. Ntxiv mus, cov xuab zeb no tsis tuaj yeem siv dua. Lub plhaub molding hlau casting qhov chaw muaj cov nqi siab dua cov xuab zeb casting. Txawm li cas los xij, lubplhaub molding casting qhov chawmuaj ntau yam zoo xws li nruj me ntsis kam rau ua, zoo nto zoo thiab tsawg casting tsis xws luag.
Txawm li cas los xij, tseem muaj qee qhov sib txawv ntawm grey hlau casting qhov chaw thiab cov hlau hlau casting qhov chaw.Grey Hlau Sand Castingfeem ntau yog siv los ua cov duab nyuaj uas yuav nyuaj lossis tsis yooj yim los ua los ntawm lwm cov txheej txheem hlau. Ua tsaug rau nws yooj yim ntawm machining, siab compressive zog, zoo thermal conductivity thiab zoo heev vibration absorption, lub grey cam khwb cia hlau yog ib tug ntawm cov feem ntau lug siv casting hlau rau lub sij hawm ntev heev, txawm nyob rau hauv tam sim no kev lag luam ntau lawm. Cov ntsiab lus carbon yog nyob deb ntawm cov ntsiab lus tseem ceeb tshaj plaws rau grey hlau (feem ntau 2% mus rau 4%) los tsim tensile zog thiab machinability. Thaum molten cam khwb cia hlau solidifies ib co ntawm cov pa roj carbon precipitates li graphite, tsim me me, irregular flakes nyob rau hauv lub siv lead ua qauv ntawm cov hlau uas txhim khu cov khoom tsim nyog ntawm cam khwb cia hlau, cov flakes cuam tshuam cov qauv siv lead ua ua rau cam khwb cia hlau tus yam ntxwv brittleness.
Kev loj hlob ntawm grey cam khwb cia hlau feem ntau yog tsav los ntawm lub zog siab. Yav dhau los, txoj hauv kev tseem ceeb los txhim kho kev ua haujlwm ntawm grey cam khwb cia hlau yog inoculation. Nyob rau hauv xyoo tas los no, txoj hauv kev tseem ceeb tam sim no yog tsom rau kev sib xyaw ua ke, thiab txhawm rau txhim kho kev ua tau zoo, ntau cov hlau hlau grey siv cam khwb cia hlau nrog ntau dua carbon sib npaug. Qhov no yog qhov tseem ceeb tshwj xeeb rau cov hlau tsis tshua muaj hlau cam khwb cia. Yog li ntawd, grey cam khwb cia hlau yog cov khoom tsim nyog los tsim cov hlau casting qhov chaw ntawm lub cav thaiv, machinery vaj tse, tshuab puag, txee qhov hnyav, qhov cub qhov cub, qhov chaw boiler, lub twj tso kua mis thiab lwm yam.
Ductile hlau muab kev tsim qauv yooj yim thiab txo cov nqi tsim khoom piv rau welded fabrications thiab forgings. Nyob rau hauv microstructure ntawm ductile hlau, graphite cov ntaub ntawv mus rau hauv spherical nodules es tsis txhob ntawm flakes, yog li inhibiting tsim cov kab nrib pleb thiab muab lub enhanced ductility uas muab lub alloy nws lub npe. Ductile hlau muaj zog tensile ntau dua thiab toughness zoo ib yam li steel.Hlau castingsmuaj ntau tus yam ntxwv, txawm li cas los xij, tsis yog ib qho txiaj ntsig zoo tshaj plaws rau lwm cov ferrous alloys. Tsis tas li ntawd, cov hlau nplaum yog siv dav hauv ntau qhov kev lag luam, suav nrog kev ua liaj ua teb, tsheb, hydraulics, tsheb ciav hlau, tsheb thauj mus los thiab kev lag luam aerospace.
Post lub sij hawm: Jan-27-2021