Vim li cas tundish metering nozzles tawg thaum siv?

Nyob rau hauv tas li ntawd mus casting, qhov sizing nozzle ntawm lub ladle yog ib tug seemingly unremarkable tab sis tseem ceeb tivthaiv. Nws ncaj qha tswj cov ntws ntawm cov hlau molten rau hauv pwm; yog tias nws ua tsis tiav, qhov tshwm sim tuaj yeem muaj los ntawm qhov tsis ruaj khov ntawm cov ntoo hla - ntu thiab slag entrapment mus rau steel to, casting interruptions, thiab txawm tias muaj kev nyab xeeb. Ntau tus engineers teb tau ntsib qhov teeb meem tsis txaus ntseeg no: txawm hais tias lub nozzle tau raug teeb tsa zoo thiab ua haujlwm raws li cov txheej txheem tshwj xeeb, vim li cas nws tawg, poob tawm, lossis muaj kev cuam tshuam hauv zos thaum siv? Nws ncaj qha tswj cov ntws ntawm cov hlau molten rau hauv pwm; yog tias nws ua tsis tiav, qhov tshwm sim tuaj yeem muaj los ntawm cov teeb meem me xws li tsis ruaj khov billet cross-sections thiab slag entrapment rau cov teeb meem loj xws li steel to, casting interruptions, lossis txawm tias muaj kev nyab xeeb.

Qhov kev pab cuam ib puag ncig ntawm lub metering nozzle yog qhov hnyav heev: qhov kub ntawm cov hlau molten feem ntau nyob nruab nrab ntawm1520℃thiab 1560 degree, thaum sab nrauv ntawm lub nozzle raug rau huab cua thiab dej txias, ua rau muaj qhov sib txawv ntawm qhov kub thiab txias.Thaum lub tundish pib casting, sab hauv phab ntsa ntawm lub nozzle yog tam sim ntawd rhuab los ntawm high - kub molten steel, generating intensive thermal expansion stress; lub caij no, cov phab ntsa sab nrauv tseem txias heev. Qhov kub ntawm qhov sib txawv ntawm cov phab ntsa sab hauv thiab sab nrauv ua rau muaj kev ntxhov siab.Yog tias cov thermal shock tsis kam ntawm cov khoom nozzle tsis txaus, los yog preheating tsis txaus, microcracks yuav pib rau ntawm phab ntsa sab hauv tsis pub dhau feeb thiab sai sai propagate mus rau hauv los ntawm - tawg.

Tej yam tshwm sim: Ntev kab nrib pleb ntawm lub nozzle, radial kab nrib pleb extending sab nraud ntawm lub puab bore.

Ntawm - qhov chaw tawm tsam:

• Lub nozzle yuav tsum nruj me ntsis preheated raws li cov cua kub nkhaus ua ntej siv. Feem ntau, qhov kub ntawm preheating yuav tsum ncav cuag saum toj no1000 degreenrog cov cua sov zoo sab hauv thiab sab nraud.
• Siv zirconia lossis zirconia-mullite nozzles nrog cov thermal poob siab zoo heev, zam tsis pub tsawg - nqi tab sis cov khoom siv tawv heev.

Lub puab tsaig ntawmlub metering nozzleyog raug rau ntev-lub sij hawm siab-ceev khiav ntawm siab- kub molten steel. Tshwj xeeb tshaj yog thaum lub casting ceev yog nce, lub shear yaig ntawm lub bore phab ntsa los ntawm molten steel yuav muaj zog heev. Tsis tas li ntawd, residual oxygen, hlau oxide, thiab inclusions nyob rau hauv molten steel reacts chemically nrog cov khoom refractory, ua rau cov tshuaj corrosion.Qhov ua ke ntawm yaig thiab corrosion maj enlarge lub puab bore ntawm lub nozzle, ua rau nws muaj nuj nqi. Nyob rau hauv cov xwm txheej hnyav, cov phab ntsa hauv zos tau txo qis rau qhov kev txwv tseem ceeb, ua rau muaj kev puas tsuaj tam sim ntawd nyob rau hauv thermal stress lossis mechanical impact.

Tej yam tshwm sim: Qhov tseem ceeb ovalization los yog tswb -qhov ncauj ntawm lub qhov ncauj qhov ntswg, spalling ntawm glazed txheej ntawm phab ntsa sab hauv.

Ntawm - qhov chaw tawm tsam:

• Tswj kev huv huv ntawm cov hlau molten kom txo cov khoom puas ntawm lub nozzle los ntawm siab -melting- cov ntsiab lus suav nrog.
• Txais cov khoom sib xyaw nrog cov ntsiab lus zirconia siab; Qhov siab dua cov ntsiab lus zirconia, qhov muaj zog tiv thaiv corrosion thiab corrosion.
• Hloov lub nozzle tsis tu ncua raws li lub sijhawm casting; tsis txhob siv nws dhau nws lub neej ua haujlwm.

• Kev nruj nruj ntawm lub nozzle thiab tundish lub rooj cib thaum lub sij hawm installation; yuam hammering ua rau cov kab nrib pleb zais hauv lub preform. Xwb, qhov xoob xoob xoob ua rau "steel nkag mus" los ntawm qhov khoob, ncaj qha ua rau lub nozzle tawg.
• Kev cuam tshuam ntau dhau thaum kaw tus pas nrig, nrog kev sib tsoo ntau zaus tiv thaiv lub taub hau lub taub hau lossis sab hauv lub qhov ntug, ua rau hauv zos chipping.
• Kev tuav tsis raug thaum hloov lub nozzle, ua rau muaj kev puas tsuaj los ntawm kev sib tsoo manipulator.

Tej yam tshwm sim: Kev puas tsuaj feem ntau nyob ntawm qhov kawg ntawm lub ntsej muag, cov kauj ruam, los yog kev sib cuag ntawm qhov chaw, nrog cov kab nrib pleb tsis tu ncua.

Ntawm - qhov chaw tawm tsam:

• Ua haujlwm nruj me ntsis raws li kev teeb tsa tshwj xeeb, siv cov cuab yeej tshwj xeeb, thiab tsis txhob sib tsoo rauj.
• Tshawb xyuas qhov sib haum ntawm lub rooj zaum cib thiab ntsuas lub nozzle kom paub tseeb tias qhov kev tshem tawm tsim nyog (feem ntau0.3-0.5 hli).
• Muab kev cob qhia tsis tu ncua rau cov neeg ua haujlwm, tshwj xeeb tshaj yog xav tau kev ua haujlwm maj mam thiab qeeb thaum kaw lub pas nrig.

• Tsis tsim nyog particle loj faib ntawm cov ntaub ntawv raw ua rau lub cev ntsuab tsis sib xws thiab zais delamination tom qab tua.
• Kev tswj tsis raug ntawm sintering kub ua rau sab hauv micro-qhov pores lossis nplej- ciam teb tawg.
• Cov ntsiab lus kev ntxhov siab tsim tawm thaum lub sij hawm bore machining (piv txwv li, cov kauj ruam thiab cov ces kaum ntse tsis sib npaug).

Xws li qhov tsis xws luag yog qhov nyuaj rau kev kuaj xyuas hauv txias - lub xeev tshuaj xyuas. Thaum raug molten steel, thermal stress thiab molten steel siab tam sim ntawd amplify qhov tsis xws luag, ua rau tam sim ntawd tsis ua hauj lwm.

Tej yam tshwm sim: Cov pob txha zoo huv si, cov kab nrib pleb ua ntej - cov kab nrib pleb uas twb muaj lawm, lossis pom tseeb qhov pore pawg.

Ntawm - qhov chaw tawm tsam:

• Xaiv cov khoom tsim nyog nrog cov txheej txheem paub tab, thiab xav tau cov ntaub ntawv tshuaj xyuas rau txhua pawg xws li thermal shock resistance, pom meej porosity, bulk ntom, thiab lwm yam.
• Ua random soj ntsuam ua ntej warehouses; Cov kab nrib pleb sab hauv tuaj yeem raug tshuaj xyuas los ntawm dye penetrant testing lossis kuaj ultrasonic.

Cov qib steel sib txawv muaj qhov sib txawv "kev puas tsuaj" ntawm nozzles. Piv txwv li, molten steel nrog siab manganese thiab siab txhuas cov ntsiab lus muaj fluidity siab thiab yooj yim tsim siab -melting- taw tes Al₂O₃ inclusions, ua rau muaj kev sib xyaw ua ke hnyav dua thiab tso tawm ntawm lub nozzle.Thaum siab casting ceev, tus nqi ntawm cov hlau molten nce thiab corrosion tus nqi nce exponentially. Tsis tas li ntawd, ultra-ntev casting ntev (piv txwv li, tshaj 8-10 teev) ua rau muaj kev sib tw hnyav rau cov khoom siv zoo tib yam, nrog cov khoom siv ua kom qaug zog thaum kawg ua rau tsis ua haujlwm.

Ntawm - qhov chaw tawm tsam:

• Xaiv cov nozzles ntawm cov qib tsim nyog raws li qib steel thiab casting ceev. Cov pa roj carbon steel siv tau zoo tib yam zirconia nozzles; aluminium-tua hlau thiab siab-manganese steel raug pom zoo kom siv siab -zirconia lossis zirconia-toughened nozzles.
• Tsim kom muaj lub neej ntawm lub nozzle, sau cov hlau tiag tiag thiab lub sijhawm casting ntawm txhua lub nozzle, thiab kho lub voj voog hloov raws li.

 

 

Yog tias koj muaj teeb meem los ntawm kev tawg tsis tu ncua ntawm metering nozzles, koj tuaj yeem xa tuaj rau peb ntawm koj cov kev ua haujlwm, suav nrog qib steel, casting ceev, tundish kub thiab casting ntev. Peb tuaj yeem pom zoo cov ntaub ntawv tsim nyog tshaj plaws rau koj. Lub nozzle zoo tsis tas yuav kim tshaj plaws, tab sis nws yuav tsum yog qhov zoo tshaj plaws match rau koj cov kab ntau lawm.

 

Hu rau tam sim no