Kev tshuaj xyuas ntawm kev tsim cov txheej txheem ntawm slag suav nrog qhov tsis zoo ntawm cov hlau castings hauv epc

1 Feem ntau ntawm slag suav nrog qhov tsis xws luag hauv cov hlau castings nrog epc

 

Nws yog ib qho nyuaj heev los tsim steel castings nrog ploj pwm. Tam sim no, feem ntau ntawm lawv yog hnav-tiv taus, tshav kub-tiv taus thiab corrosion-resisting castings yam tsis ua los yog tsawg ua, los yog lwm yam nyias-wall castings. Lub ntsiab yog vim li cas rau qhov tsis xws luag ntawm cov hlau tsis tshua muaj hlau castings yog qhov tsis sib xws carburization thiab slag suav nrog qhov tsis xws ntawm cov tuab thiab loj. Rau cov hlau castings nrog ib tug tej thickness thiab feem ntau ntawm cov uas tsis muaj carbon steel castings, qhov kev faib ua feem ntawm carburization, slag inclusion los yog porosity defects yog ntau tshaj li 60%, uas ua rau cov uas tsis muaj carbon steel thiab tuab tuab hlau castings yog qhov nyuaj nyuaj ntawm cov khoom. ploj pwm casting txheej txheem, thiab txawm txiav txim siab tias qhov poob pwm casting txheej txheem tsis haum rau steel castings.

 

1.1 Cov ntaub ntawv tsis raug ntawm epc steel castings

 

Qhov tsis xws luag ntawm epc steel casting yog slag inclusion, porosity thiab carburization. Cov duab ntawm qhov tsis xws luag yog tsis tu ncua, qhov tsis xws ntug yog tsis xwm yeem, thiab qhov tsis xws luag yog dispersed heev, uas yog manifested nyob rau hauv txawv xim ntxoov ntawm daim duab metallographic. Daim ntawv sib sau ua ke ntawm qhov tsis xws luag feem ntau yog pawg nrog fuzzy ciam teb thiab cov xim tawg, uas nyuaj rau kev tshem tawm los ntawm kev ua haujlwm.

 

1.2 Feem ntawm qhov tsis xws luag nyob rau hauv poob pwm casting steel qhov chaw

 

Qhov kev faib ua feem ntawm qhov tsis xws luag hauv epc steel castings yog siab heev. Xws li hnav -, kub - thiab corrosion-resistant castings, los yog lwm yam nyias - thiab tuab-walled steel castings, tsis muaj los yog tsis muaj machining. Rau nyias-phab ntsa hlau castings, qhov tsis xws luag feem ntau yog pores thiab slag qhov ntawm lub hauv paus ntawm lub rooj vag los yog riser. Rau tuab phab ntsa steel castings, qhov tsis xws luag yog feem ntau subcutaneous slag defects. Rau qis carbon steel castings, qhov tsis xws luag yog feem ntau nto tsis sib xws carburization defects.

 

1.3 Cov khoom ua rau muaj qhov tsis xws luag ntawm epc hlau castings

 

Cov phab ntsa thickness thiab cov ntsiab lus carbon ntawm epc steel castings yog txawv nyob rau hauv qhov chaw uas tsis xws luag yog ib qho yooj yim mus ua. Rau nyias phab ntsa peb resistant castings, feem ntau tshwm nyob rau hauv lub casting thiab rooj vag los yog riser txuas qhov chaw. Qhov chaw uas txuas nrog cov txheej txheem casting casting, qhov ntws mus rau lub sijhawm ntev, ua kom lub sijhawm cua sov yog ntev dua, molten steel overheat cov khoom pwm, cov khoom pwm, ib nrab melting nqus roj ntau hauv cov kua hlau thiab slag tsub zuj zuj los ntawm kev thaiv. , molten steel txias thiab solidification shrinkage, yooj yim ua rau cov khoom no tom qab txias solidification daim ntawv qhov, shrinkage porosity, slag mix defects.

 

2. Qhov tshwj xeeb ntawm pwm filling ntawm epc cam khwb cia hlau

 

Casting defects yog tsim thaum lub sij hawm ntawm casting filling txheej txheem solidification, feem ntau lub sij hawm filling ntawm me me thiab nruab nrab castings yog luv heev, thiab lub sij hawm filling ntawm loj castings kuj luv. Sib txawv ntawm cov kab noj hniav zoo tib yam, qhov tshwj xeeb ntawm pwm txhaws ntawm epc casting yog qhov laj thawj tseem ceeb ntawm slag suav nrog qhov tsis xws luag ntawm epc steel casting.

 

2.1 Sau daim ntawv ntawm epc steel castings

 

Raws li rau cov kua hlau filling txheej txheem ntawm epc, feem ntau ntawm cov kev tshawb fawb yog raws li nyob rau hauv lub filling txheej txheem ntawm epc rau txhuas alloy, thiab feem ntau ntawm lawv yog sau tsis muaj siab phem. Nyob rau hauv cov xwm txheej zoo li no, cov duab ntawm cov kua hlau filling yog tias tom qab nkag mus rau hauv qhov "kab noj hniav" los ntawm lub qhov rooj sab hauv, cov kua hlau ua ntej thawb mus rau hauv lub kiv cua zoo li. Nyob rau hauv qhov kev txiav txim ntawm lub ntiajteb txawj nqus, cov kua hlau ua rau pem hauv ntej deforms downwards, tab sis cov qauv dav dav yog thawb tawm ntawm lub qhov rooj sab hauv kom txog thaum "kab noj hniav" puv. Lub ciam teb zoo ntawm kev sib cuag ntawm cov kua hlau thiab cov duab muaj feem xyuam rau qhov kub thiab txias ntawm cov kua hlau, cov khoom ntawm cov khoom zoo thiab lub filling ceev. Yog tias qhov kub thiab txias ntawm cov kua hlau yog siab dua, cov duab ntom ntom me dua thiab qhov ntim nrawm nrawm dua, tag nrho cov kev nce qib ntawm cov kua hlau nrawm dua. Nws txawv nrog hom alloy, pouring kub, sprue cheeb tsam, pouring ceev, zoo li ceev ceev, siab kub cua permeability ntawm txheej thiab tsis zoo siab. Rau aluminium alloy tsis muaj qhov tsis zoo siab pouring, kev sib tshuam ntawm cov kua hlau thiab cov duab tuaj yeem muab faib ua plaub qauv raws li cov xwm txheej sib txawv: hom kev sib cuag, hom tshem tawm, hom kev sib tsoo thiab hom kev koom tes.

 

2.2 Turbulent morphology thiab phab ntsa txuas cov nyhuv ntawm cov kua hlau filling

 

Nyob rau hauv lub pwm nyob rau hauv zus tau tej cov cam khwb cia hlau, cam khwb cia hlau daim, Suav lag luam yog nyob rau hauv tus txheej txheem ntawm casting impose tsis zoo siab ntawm qhuav xuab zeb casting, kom nruj ntawm qhuav xuab zeb pwm, ua rau cov pwm nrog txaus lub zog thiab rigidity, tiv thaiv cov feem ntawm cov kua hlau thiab buoyancy, xyuas kom meej pouring. thiab solidification nyob rau hauv cov txheej txheem zoo, kom tau ib tug tiav qauv ntawm castings. Cov xuab zeb qhuav pwm muaj lub zog txaus thiab nruj tsis muaj qhov siab ntawm cov xuab zeb lub thawv. Nws plays lub luag haujlwm tseem ceeb hauv txoj kev loj hlob ntawm kev poob hom casting tshuab.

 

3 Kev soj ntsuam ntawm qhov chaw thiab thermodynamics thiab kinetics ntawm slag suav nrog hauv cov hlau molten

 

Muaj ntau qhov chaw ntawm slag thiab roj nyob rau hauv molten steel, nrog rau cov seem thiab cov pa roj ntawm cov khoom pyrolysis xws li gasification, cov seem thiab cov roj uas tsim nyob rau hauv cov txheej txheem smelting ntawm molten steel, thiab cov oxide residue tsim los ntawm oxidation ntawm molten steel, thiab dissolution. ntawm ib co gases los ntawm kub kub molten hlau. Vim yog qhov me me ntawm cov dregs thiab gases, lawv yuav ntab nce mus qeeb qeeb hauv cov txheej txheem sau thiab cov txheej txheem ua kua ua ntej ua kom khov, thiab ntab mus rau qhov qis dua qhov siab nyob rau hauv qhov kev txiav txim siab tsis zoo.

 

4 Txoj kev thiab cov lus qhia kom txo tau cov slag suav nrog cov hlau qhov chaw nrog ploj pwm casting

 

4.1 Ncaj qha txo cov thawj inclusions nyob rau hauv molten hlau

 

Txo cov inclusions nyob rau hauv molten hlau ua ntej pouring yog ib tug ntawm cov tseem ceeb txoj kev los txo cov slag inclusion defects nyob rau hauv poob pwm castings. Muaj ntau txoj hauv kev los ntxuav cov hlau molten, xws li siv cov khoom siv slagging, tso siab rau cov adsorption ntawm tus neeg saib xyuas purifying ntawm kev suav nrog, adsorbed cov khoom me me ntawm kev suav nrog rau cov khoom loj ntawm cov khoom siv purifying ntxiv, tsim cov ntim loj ntawm kev suav nrog. particles, uas yog qhov zoo los txhim kho cov kev mob dynamic ntawm ntab.

 

4.2 Txo kev koom nrog hauv cov hlau molten los ntawm kev ntsuas thev naus laus zis thiab ntxiv dag zog rau kev tso tawm ntawm kev suav nrog

 

(1) Tsim nyog tsim ntawm pouring riser system. Raws li qhov ua tau nrog tsawg dua ib lub thawv casting, kom deb li deb tau los txo qhov muaj nyob ntawm cov hlau molten nyob rau hauv lub sij hawm pouring system, uas yog, txo los yog tshem tawm cov khiav; Ntau tshaj ib lub thawv casting yuav inevitably ua rau lub pouring system ntev dhau lawm. Thaum molten steel yog sau los ntawm lub pouring system, nws yog ib qho yooj yim los tsim turbulence thiab txaws nyob rau hauv lub multi-khoov thiab variable seem channel ntawm lub pouring system, uas txo cov kub ntawm molten steel, ua rau molten steel oxidation, scours sab phab ntsa. ntawm lub sprue, thiab nce tus thawj inclusions nyob rau hauv molten steel.

 

(2) txo cov tsos ntawm cov nplaum nplaum. Kev sib txuas ntau dhau ntawm qhov sib txawv, yooj yim ua rau qhov sib txawv nrog kev hloov ntau dhau ntawm cov kua nplaum, ua rau cov nplaum nplaum sib koom ua ke los yog concave. Vim lub siab ceev ntawm lub convex nplaum, cov roj thiab residue generated tom qab gasification muaj ntau, uas ua nyob rau hauv qhov kev nce rau ntawm tag nrho cov slag nqi; Lub concave adhesion kua nplaum tsim qhov sib txawv, thaum txheej txheej txheej, cov txheej uas muaj zog heev permeability yooj yim nkag mus rau qhov sib txawv concave.

 

(3) Tsim nyog txo qhov tsis zoo siab. Lub siab tsis zoo yog qhov laj thawj tseem ceeb rau kev ua kom muaj kev kub ntxhov los ntawm molten steel filling. Kev ua kom muaj zog ntxiv ua rau cov hlau molten los nplawm cov txheej txheem dej thiab "kab noj hniav" phab ntsa, thiab cov hlau molten kom txaws ntau dua, ua rau cov dej ntws ntws, yooj yim koom nrog hauv cov khoom siv thiab cov pa roj. Txoj kev tsim nyog yog ua kom tau raws li qhov tsim nyog lub zog thiab nruj ntawm cov xuab zeb qhuav qhuav thiab xyuas kom meej tias cov casting tsis vau nyob rau hauv cov txheej txheem ntawm pouring filling, txo qis qhov tsis zoo siab, qhov zoo dua.

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Post lub sij hawm: Sep-24-2021