Kev tsim cov txheej txheem ntawm kev suav nrog qhov tsis zoo hauv epc casting

1 suav nrog qhov tsis xws luag hauv epc castings

 

Inclusion defects nyob rau hauv epc castings muaj ntau heev. Inclusion defects nyob rau hauv epc castings feem ntau txo cov khoom ntawm castings. Nyob rau tib lub sijhawm, vim qhov tsis sib xws ntawm kev suav nrog, nws tuaj yeem ua rau cov kab nrib pleb lossis cov kab nrib pleb hauv castings thaum ua haujlwm. Cov kev suav nrog tsis yog tsuas yog txo cov khoom pov tseg, tab sis kuj txhim kho lub zog hauv zos ntawm cov casting vim qhov chaw tsis xws luag, uas tuaj yeem yooj yim ua rau qhov ntxhib machining nto, cuam tshuam rau kev txiav thiab cov cuab yeej puas. Inclusion defects nyob rau hauv epc castings yog feem ntau irregular pawg nrog uneven inclusion ceev thiab porosity, los yog slag porosity.

 

1.1 Daim ntawv ntawm kev suav nrog tsis xws luag hauv epc ua

 

Kev suav nrog cov tsis xws luag ntawm epc castings yog slag, slag porosity thiab xuab zeb inclusion. Cov duab ntawm qhov tsis xws luag feem ntau muaj ntau haiv neeg, cov duab ntug tsis sib xws, qhov loj yog txawv, nyob rau hauv ib pawg faib, slag thiab slag pores feem ntau yog dub thiab grey, xim yog txawv ntxoov. Muaj cov hmoov hmoov nyob rau hauv qhov tsis xws luag, los yog tsis xwm yeem metallurgical slag nyob rau hauv cov kua hlau, los yog cov khoom seem ntawm cov pyrolysis ntawm cov ntaub ntawv zoo sib xws, los yog pleev xim rau hauv cov khoom tsis sib xws lossis tsis tu ncua grey hmoov hmoov.

 

1.2 Inclusions feem ntau poob pwm casting

 

Kev suav nrog hauv cov pwm ploj ploj yog qhov yooj yim tshwm sim, thiab muaj qee yam kev cai raws li cov qauv sib txawv, pwm tsim, tshuab tsim thiab cov xwm txheej. Yog vim li cas ntawm kev tsim muaj feem xyuam rau cov ntsiab lus ntawm residue nyob rau hauv cov kua hlau, cov txheej txheem ntawm kev tsis zoo siab pouring, lub ndlwg xeev ntawm cov kua hlau thiab lub solidification txheej txheem ntawm casting. Rau nyias-walled steel castings nrog tshav kub tsis kam, hnav tsis kam thiab corrosion kuj, porosity los yog slag qhov tsis xws luag yog ib qho yooj yim tshwm sim, feem ntau nyob rau hauv cov khoom txuas nrog lub rooj vag lossis riser. 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, cov kua hlau ua rau cov khoom pov tseg overheating, ib nrab melting casting khoom, nqus roj ntau hauv cov kua hlau thiab suav nrog los ntawm kev thaiv. tsub zuj zuj, molten steel txias thiab solidification shrinkage, yooj yim ua rau cov khoom no tom qab txias solidification daim ntawv qhov, shrinkage porosity, slag mixed defects.

 

2 Filling txheej txheem ntawm ploj tuag casting

 

Casting defects yog tsim thaum lub sij hawm ntawm casting filling thiab solidification txheej txheem. Feem ntau, lub sij hawm ntim ntawm me me thiab nruab nrab-qhov loj me castings tsuas yog ob peb vib nas this, ntau tshaj kaum vib nas this los yog kaum vib nas this, thiab lub sij hawm puv ntawm cov castings loj kuj ua tiav ob peb feeb. Sib txawv ntawm cov kab noj hniav zoo tib yam, qhov tshwj xeeb ntawm pwm ntim hauv epc casting yog qhov tseem ceeb ntawm kev suav nrog kev tsim kho.

 

2.1 Sau daim ntawv ntawm epc casting

 

Hais txog qhov poob ua npuas ncauj casting kua hlau filling txheej txheem, kua hlau filling morphology, los ntawm lub rooj vag mus rau hauv lub casting, tom qab lub "kab noj hniav" hlau ntxuam daim ntawv rau pem hauv ntej, nyob rau hauv cov nyhuv ntawm lub ntiajteb txawj nqus, cov kua hlau filling frontier downward deformation, tab sis tag nrho. kev sib tw yog nce mus rau qhov kev taw qhia ntawm qhov deb ntawm lub rooj vag, kom txog rau 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. Rau aluminium alloy tsis muaj qhov tsis zoo siab pouring, qhov sib txuas ntawm cov kua hlau thiab cov duab tuaj yeem muab faib ua plaub hom: 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 cov txheej txheem ntawm kev poob pwm casting, cov xuab zeb qhuav pwm yog nruj nreem los ntawm kev siv lub siab tsis zoo rau cov xuab zeb qhuav pwm thaum lub sij hawm casting txheej txheem, thiaj li hais tias cov pwm muaj txaus lub zog thiab nruj los tiv thaiv tej yam thiab buoyancy ntawm kua hlau, li ntawd. los xyuas kom meej qhov kev ncaj ncees thiab kev ua tau zoo ntawm cov pwm nyob rau hauv tag nrho cov txheej txheem ntawm casting thiab solidification, thiab tau txais tag nrho cov qauv ntawm cov casting. Lub siab tsis zoo tso cai rau cov dub alloy castings raug pov rau hauv hom poob. Cov xuab zeb qhuav pwm muaj lub zog txaus thiab nruj kom tso cai rau cov txheej txheem casting mus ntxiv yam tsis tau nce qhov siab ntawm lub thawv xuab zeb.

 

3 Lub hauv paus ntawm kev suav nrog hauv cov kua hlau

 

Kev suav thiab roj hauv cov khoom siv hlau muaj xws li ntau yam, xws li cov tsos ntawm cov khoom siv hluav taws xob zoo li pyrolysis thiab cov pa roj, cov txheej txheem ua kua hlau smelting ntawm cov pulp yog thiab cov pa roj, thiab cov pulp yog tsim los ntawm oxidation ntawm cov kua hlau oxide, muaj qee yam gases. nyob rau hauv qhov kub siab ntawm cov kua hlau kom yaj, thiab cov khib nyiab rau hauv lub kaw lus kaw ", thiab lwm yam.

 

4 Txoj hauv kev los txo cov kev suav nrog hauv kev poob tuag castings

 

4.1 Txo cov thawj koom nrog hauv cov kua hlau

 

Txo kev suav nrog hauv cov kua hlau ua ntej nchuav yog txoj hauv kev tseem ceeb los txo cov kev suav nrog hauv cov hlau casting qhov chaw. Muaj ntau txoj hauv kev los ntxuav cov hlau ua kua. Cov hlau ua kua purifier tuaj yeem siv tau, uas yog, cov khoom siv slag tuaj yeem siv tau. Kev suav nrog cov khoom me me tuaj yeem ua rau adsorbed ntawm cov khoom loj ntawm kev suav nrog los ntawm kev cia siab rau cov adsorption ntawm kev koom ua ke los tsim cov khoom loj dua, uas yog qhov zoo los txhim kho cov xwm txheej zoo ntawm nws cov ntab.

 

4.2 Cov txheej txheem ntsuas yuav tsum tau coj los txo qhov kev suav nrog hauv cov kua hlau thiab ntxiv dag zog rau kev tshem tawm ntawm kev suav nrog

 

(1) Tsim nyog tsim cov txheej txheem pouring riser: kom deb li deb tau siv tsawg tshaj li ib lub thawv casting, kom deb li deb tau kom txo tau lub sij hawm ntawm cov hlau ua kua nyob rau hauv lub pouring system, uas yog, txo los yog tshem tawm cov khiav; Ntau casting nyob rau hauv ib lub thawv yuav inevitably ua rau lub pouring system ntev dhau lawm. Thaum cov hlau ua kua dhau los ntawm cov txheej txheem pouring, nws yog ib qho yooj yim los tsim turbulence thiab txaws nyob rau hauv lub multi-khoov thiab sib txawv seem channel ntawm lub pouring system, uas txo qhov kub ntawm cov hlau kua, ua rau lub oxygenation ntawm cov kua hlau, scour sab phab ntsa ntawm spat thiab nce cov thawj inclusions nyob rau hauv cov kua hlau.

 

(2) Kev txo qis ntawm qhov tsis zoo: lub siab tsis zoo yog qhov laj thawj tseem ceeb rau kev ua kom muaj kev kub ntxhov tshwm sim los ntawm cov hlau ua kua filling. Ua rau muaj kev kub ntxhov ntau ntxiv ua rau cov hlau molten los ntxuav lub qhov rooj thiab lub "kab noj hniav" phab ntsa, ua rau txaws thiab tsim cov vortices uas yooj yim koom nrog hauv cov khoom siv thiab cov pa roj.

 

4.3 Tiv thaiv cov khib nyiab sab nraud kom nkag mus rau hauv kab noj hniav

 

(1) zoo li "kab noj hniav" thiab cov xuab zeb qhuav: pouring system tsos thiab casting tsos thiab cov xuab zeb qhuav ntawm lub foob tsis yooj yim ua rau cov xuab zeb qhuav rau hauv "kab noj hniav", sealing feem ntau yog nyob ntawm txheej txheej, txheej txheej kom ua tau raws li qhov yuav tsum tau ua. , uniform thickness, tshwj xeeb tshaj yog nyob rau hauv cov tsos ntawm lub puab ces kaum, los tiv thaiv txheej tsub zuj zuj ntawm tuab heev tshwm sim los ntawm tawg los yog ntog tawm.

 

(2) txo cov kev sib txuas ntawm cov pob qij txha: ntau qhov sib txuas sib txuas, yooj yim ua rau muaj kev hloov pauv ntau dhau ntawm cov kua nplaum uas siv rau hauv qhov sib txawv, ua rau cov nplaum pob qij txha convex lossis concave.

 

(3) kom deb li deb tau los siv zoo foaming molding casting tsos thiab casting system zoo li: yog hais tias ntawm cov ntau lawm batch tsuas yog siv lub phaj txiav tsos, cov tsos ntawm nto yuav tsum tau kho kom zoo, polished thiab huv si, thaum tsim nyog. , nrog filling muab tshuaj txhuam kom du hauv zos qhov khoob thiab qhov pits.

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Post lub sij hawm: Sep-14-2021