Coated Sand (plhaub Molding)
Coated xuab zeb, tseem hu ua plhaub molding xuab zeb, muaj silica xuab zeb hais ua ntej -coated nrog ib txheej nyias ntawm thermosetting phenolic resin. Cov pwm yog tsim los ntawm tshuab cov xuab zeb coated rau hauv cov qauv hlau rhuab (feem ntau 175-370 degree), qhov twg cov resin melts, ntws, thiab kho sai sai los tsim ib lub plhaub nruj.
Qhov zoo: Ua cov castings nrog qhov tshwj xeeb siab qhov tseeb thiab zoo tshaj qhov chaw tiav, feem ntau piv rau precision casting. Nws tso cai rau cov creation ntawm intricate cores thiab complex internal geometry. Resin txheej muab zoo flowability, enabling ntom ntim. Nws yog tsim nyog rau nruab nrab mus rau loj ntim ntau lawm sau.
Qhov tsis zoo: Cov khoom siv raw (pre-coated xuab zeb) kuj kim heev. Cov txheej txheem yuav tsum tau them nqi hlau cov qauv uas muaj lub sij hawm ntev txhuas. Nws yog feem ntau txwv rau me me, sib dua - hnyav castings (feem ntau nyob rau hauv ob peb lub kaum os kilograms) vim lub zog ntawm lub plhaub nyias. Xuab zeb reclamation yog qhov nyuaj thiab lub zog- hnyav, feem ntau yuav tsum tau siab -kub thermal reclamation (nyob ib ncig ntawm 700℃). Thaum lub sij hawm casting, nws muaj peev xwm emit ib tug tseem ceeb irritating gases xws li formaldehyde thiab ammonia, yuav tsum tau cov khoom kim heev cua tu.
Resin Sand (Tsis yog- Ci)
Resin xuab zeb casting yog txheej txheem uas cov kua resin (piv txwv li, furan, phenolic) thiab cov catalyst yog tov nrog cov xuab zeb nyoos ntawm chav tsev kub. Qhov sib tov no yog nchuav rau hauv cov qauv thiab tso cai rau nws tus kheej- tawv chemically (hauv feeb mus rau teev) ua ntej tus qauv raug tshem tawm thiab molten hlau yog poured.
Qhov zoo: Nws yog tus nqi tshwj xeeb- zoo thiab muaj ntau yam rau cov khw muag khoom vim nws tsis xav tau cov cuab yeej siv hluav taws xob kim. Nws tsim cov pwm uas muaj zog thiab nruj heev, muaj peev xwm tuav qhov hnyav thiab siab ntawm qhov loj, hnyav castings (los ntawm ob peb kilograms mus rau ntau tons). Resin xuab zeb sib tov muaj zoo flowability thiab compaction. Ib feem tseem ceeb (85%-95%) ntawm cov xuab zeb tuaj yeem rov qab tau thiab rov siv cov tshuab, ua rau nws muaj kev nyab xeeb dua qub thiab siv nyiaj ntau dua thaum lub sijhawm.
Disadvantages: Resin binders thiab lawv cov catalysts cuam tshuam yog kim, ua rau cov khoom siv ntau dua. Qhov tseeb qhov tseeb thiab qhov chaw tiav, thaum zoo, tsis yog qhov tseeb raws li qhov ua tiav nrog cov txheej txheem coated xuab zeb. Cov txheej txheem tshuaj tua kab mob ua rau cov tshuaj tsis haum cov organic sib txuas thiab cov ntxhiab tsw tsis zoo, tsim kom muaj huab cua zoo thiab muaj kuab paug tswj cov teeb meem hauv qhov chaw tsim khoom.
