Tus kheej-hardening xuab zeb pwm casting lossis tsis muaj ci xuab zeb casting belongs rau ib hom resin coated xuab zeb casting lossisplhaub molding txheej txheem. Nws siv cov khoom siv tshuaj binder los sib tov nrog cov xuab zeb thiab cia lawv ua kom nyuaj ntawm lawv tus kheej. Vim tias tsis muaj txheej txheem ua ntej cua sov, cov txheej txheem no tseem hu ua tsis muaj ci xuab zeb molding casting txheej txheem.
Lub npe tsis muaj ci yog los ntawm cov roj-oxygen self-hardening tsim los ntawm Swiss thaum ntxov 1950, uas yog, cov roj qhuav xws li roj linseed thiab tung roj ntxiv nrog hlau desiccants (xws li cobalt naphthenate thiab aluminium naphthenate) thiab oxidant. (xws li potassium permanganate lossis sodium perborate, thiab lwm yam). Siv cov txheej txheem no, cov xuab zeb tseem tuaj yeem ua rau lub zog xav tau rau pwm tso tawm tom qab khaws cia rau ob peb teev ntawm chav tsev kub. Nws yog hu ua chav sov hardening (Air Set), self hardening (Self Set), txias hardening (Cold Set) thiab hais txog. Tab sis nws tsis tau mus txog qhov tseeb ntawm nws tus kheej hardening, uas yog, tsis muaj ci (Tsis muaj ci), vim hais tias cov pwm tiav (core) yuav tsum tau qhuav rau ob peb teev ua ntej pouring kom tiav hardening.
"Self-hardening xuab zeb" yog ib lo lus uas tshwm sim tom qab kev lag luam foundry tau txais cov tshuaj binders, thiab nws lub ntsiab lus yog:
1. Nyob rau hauv cov txheej txheem sib tov xuab zeb, ntxiv rau kev ntxiv cov binder, tus neeg sawv cev solidifying (hardening) uas tuaj yeem ua kom tawv tawv kuj tseem ntxiv.
2. Tom qab molding thiab cov tub ntxhais ua nrog cov xuab zeb zoo li no, tsis muaj kev kho mob (xws li ziab lossis tshuab ziab khaub ncaws) yog siv los ua cov pwm los yog cov tub ntxhais, thiab cov pwm lossis cov tub ntxhais tuaj yeem ua rau nws tus kheej.
Los ntawm lig 1950s mus rau thaum ntxov 1960s, qhov tiag self-hardening txoj kev tsis muaj qhov cub tau maj mam tsim, uas yog lub acid-kho (catalyzed) furan resin los yog phenolic resin self-hardening txoj kev, thiab tus kheej-hardening roj urethane txoj kev yog tsim nyob rau hauv 1965. Cov phenolurethane nws tus kheej-hardening txoj kev tau qhia nyob rau hauv 1970, thiab cov phenolic ester Tus kheej-hardening txoj kev tau tshwm sim nyob rau hauv 1984. Yog li ntawd, lub tswv yim ntawm "tus kheej-setting xuab zeb" yog siv rau tag nrho cov chemically hardened molding sands, xws li nws tus kheej-teev roj xuab zeb, dej iav xuab zeb, cement xuab zeb, aluminium phosphate bonded xuab zeb thiab resin xuab zeb.
Raws li tus kheej-hardening txias lub thawv ntawv xuab zeb, furan resin xuab zeb yog qhov ntxov tshaj plaws thiab tam sim no feem ntau siv hluavtaws binder xuab zeb hauvSuav foundry. Tus nqi ntawm cov resin ntxiv rau hauv molding xuab zeb yog feem ntau 0.7% mus rau 1.0%, thiab cov nyiaj ntxiv resin hauv cov xuab zeb feem ntau yog 0.9% mus rau 1.1%. Cov ntsiab lus ntawm dawb aldehyde nyob rau hauv furan resin yog qis dua 0.3%, thiab qee qhov chaw tsim khoom tau poob qis dua 0.1%. Hauv cov foundries hauv Suav teb, furan resin self-hardening xuab zeb tau mus txog qib thoob ntiaj teb tsis hais txog cov txheej txheem tsim khoom thiab qhov zoo ntawm cov castings.
Tom qab sib tov cov xuab zeb qub (los yog cov xuab zeb reclaimed), kua resin thiab kua catalyst tusyees, thiab muab tso rau hauv lub thawv tub ntxhais (los yog lub thawv xuab zeb), thiab tom qab ntawd muab nruj nreem rau hauv pwm los yog pwm nyob rau hauv lub thawv tub ntxhais (los yog lub thawv xuab zeb). ) nyob rau hauv chav tsev kub, lub casting pwm los yog casting core yog tsim, uas yog hu ua self-hardening txias-core box modeling (core), los yog nws tus kheej-hardening method (core). Tus kheej-hardening txoj kev yuav muab faib ua acid-catalyzed furan resin thiab phenolic resin xuab zeb self-hardening txoj kev, urethane resin xuab zeb nws tus kheej-hardening txoj kev thiab phenolic monoester nws tus kheej-hardening txoj kev.
Cov yam ntxwv tseem ceeb ntawm tus kheej-hardening molding txheej txheem yog:
1) Txhim kho qhov tseeb qhov tseeb ntawmcastingsthiab qhov saum npoo roughness.
2) Lub hardening ntawm pwm (core) xuab zeb tsis tas yuav ziab, uas tuaj yeem txuag hluav taws xob, thiab cov ntoo pheej yig lossis cov thawv yas thiab cov qauv siv tau.
3) Nws tus kheej-hardnening molding xuab zeb yog ib qho yooj yim rau compact thiab vau, yooj yim los ntxuav cov castings, thiab cov xuab zeb qub tuaj yeem siv tau thiab rov siv dua, uas txo cov kev siv zog ntawm cov tub ntxhais ua, qauv, xuab zeb ntog, tu thiab lwm yam kev sib txuas, thiab Nws yog ib qho yooj yim kom paub mechanization lossis automation.
4) Qhov loj feem ntawm resin hauv cov xuab zeb tsuas yog 0.8% ~ 2.0%, thiab cov nqi ntawm cov ntaub ntawv raw yog tsawg.
Vim hais tias tus kheej-hardening casting txheej txheem muaj ntau yam ntawm cov saum toj no-hais tshwj xeeb zoo, tus kheej-hardening xuab zeb pwm casting tsis tsuas yog siv rau cov tub ntxhais ua, tab sis kuj siv rau casting molding. Nws yog tshwj xeeb tshaj yog haum rau ib thooj thiab me me batch ntau lawm, thiab muaj peev xwm tsim cam khwb cia hlau, cam khwb cia hlau thiabnon-ferrous alloy castings. Qee qhov chaw tsim khoom hauv Suav teb tau hloov cov av nplaum qhuav xuab zeb pwm, cement xuab zeb pwm, thiab ib nrab hloov dej iav xuab zeb pwm.
Post lub sij hawm: Jan-21-2021