Nyob rau hauv cov txheej txheem ntau lawm, cov tuam txhab foundry yuav inevitably ntsib casting defects xws li shrinkage, npuas, thiab segregation, uas ua rau tsawg casting yields. Re-melting thiab ntau lawm yuav ntsib ib tug loj npaum li cas ntawm manpower thiab hluav taws xob noj. Yuav ua li cas txo qhov tsis xws luag casting yog ib qho teeb meem uas cov kws tshaj lij nrhiav tau ib txwm txhawj xeeb txog.
Hais txog qhov teeb meem ntawm kev txo qis qhov tsis xws luag, John Campbell, tus xibfwb ntawm University of Birmingham hauv UK, muaj kev nkag siab tshwj xeeb ntawm kev txo qis qhov tsis xws luag. Raws li thaum ntxov xyoo 2001, Li Dianzhong, tus kws tshawb fawb ntawm lub koom haum ntawm Kev Tshawb Fawb Hlau, Suav Academy ntawm Kev Tshawb Fawb, tau ua cov txheej txheem kub txheej txheem simulation thiab txheej txheem tsim raws li kev qhia ntawm xibfwb John Campbell. Niaj hnub no, Intercontinental Media tau sau cov npe ntawm kaum lub hauv paus ntsiab lus ntawm kev txo qis qhov tsis xws luag uas tau thov los ntawm thoob ntiaj teb casting master John Campbell.
1.Good castings pib nrog high-zoo smelting
Thaum koj pib pouring castings, koj yuav tsum xub npaj, xyuas thiab tswj cov txheej txheem smelting. Yog tias xav tau, tus qauv tsim nyog qis tshaj tuaj yeem txais yuav. Txawm li cas los xij, ib qho kev xaiv zoo dua yog npaj thiab txais yuav ib txoj kev npaj smelting ze ze rau qhov tsis xws luag.
2. Tsis txhob muaj kev sib xyaw ua ke ntawm cov kua dej dawb
Qhov no yuav tsum zam kom tsis txhob dhau qhov nrawm nrawm ntawm cov kua dej hauv pem hauv ntej (meniscus). Rau feem ntau cov hlau, qhov siab tshaj plaws ntws tawm yog tswj ntawm 0.5m / s. Rau kaw kaw tshuab los yog nyias-walled qhov chaw, qhov siab tshaj plaws khiav ceev yuav raug tsim nyog. Qhov kev xav tau no kuj txhais tau hais tias qhov poob siab ntawm cov hlau molten tsis tuaj yeem tshaj qhov tseem ceeb ntawm qhov "zoo li qub" qhov siab.
3.Tsis txhob laminar inclusions ntawm nto condensate shells nyob rau hauv lub molten hlau
Qhov no yuav tsum tau hais tias thaum lub sij hawm tag nrho cov txheej txheem filling, tsis muaj pem hauv ntej kawg ntawm cov hlau molten yuav tsum tsis txhob ntws ntxov ntxov. Lub molten hlau meniscus nyob rau hauv thaum ntxov theem ntawm txhaws yuav tsum nyob twj ywm txav thiab tsis cuam tshuam los ntawm lub thickening ntawm lub nto condensate shells, uas yuav ua ib feem ntawm lub casting. Yuav kom ua tiav cov nyhuv no, qhov kawg ntawm cov hlau molten tuaj yeem tsim los nthuav tawm tsis tu ncua. Hauv kev xyaum, tsuas yog lub hauv qab pouring "nce toj" tuaj yeem ua tiav cov txheej txheem nce ntxiv. (Piv txwv li, nyob rau hauv lub ntiajteb txawj nqus casting, nws pib ntws mus rau hauv qab ntawm tus khiav ncaj). Qhov no txhais tau tias:
Hauv qab pouring system;
Tsis muaj "downhill" ntog lossis zawv zawg ntawm cov hlau;
Tsis muaj kab rov tav ntws loj;
Tsis muaj pem hauv ntej-kawg nres ntawm cov hlau vim yog pouring los yog cascading ntws.
4.Tsis txhob tso pa tawm (ua npuas tsim)
Tsis txhob tso cua nkag rau hauv lub qhov dej kom tsis txhob ua npuas nkag mus rau hauv kab noj hniav. Qhov no tuaj yeem ua tiav los ntawm:
Tsim nyog tsim cov kauj ruam pouring khob;
Tsim nyog tsim cov sprue kom ceev filling;
Tsim nyog siv lub "dam";
Tsis txhob siv lub "zoo" lossis lwm qhov qhib qhov dej;
Siv ib tug me me cross-section runner los yog siv ib tug ceramic lim nyob ze ntawm kev sib txuas ntawm sprue thiab tus ntoo khaub lig khiav;
Siv lub tshuab degassing;
Cov txheej txheem pouring yog uninterrupted.
5.Tsis txhob xuab zeb core pores
Tsis txhob muaj cua npuas tsim los ntawm cov xuab zeb core lossis xuab zeb pwm los ntawm kev nkag mus rau cov hlau molten hauv kab noj hniav. Cov xuab zeb core yuav tsum muaj huab cua tsawg heev, lossis siv cov pa kom tsim nyog los tiv thaiv kev tsim cov xuab zeb core pores. Av nplaum-raws li xuab zeb cores lossis pwm kho cov kua nplaum siv tsis tau tshwj tsis yog tias lawv qhuav tag.
6.Tsis txhob shrinkage kab noj hniav
Vim yog convection thiab tsis ruaj tsis khov siab gradients, nws yog tsis yooj yim sua kom ua tau upward shrinkage pub rau tuab thiab loj cross-section castings. Yog li ntawd, tag nrho cov kev cai pub mis shrinkage yuav tsum tau ua raws li kom ntseeg tau tias lub shrinkage pub mis zoo tsim, thiab computer simulation tshuab yuav tsum tau siv rau kev txheeb xyuas thiab cov qauv casting tiag tiag. Tswj lub flash theem ntawm kev sib txuas ntawm cov xuab zeb pwm thiab cov xuab zeb core; tswj lub thickness ntawm casting txheej (yog tias muaj); tswj cov alloy thiab casting kub.
7. Tsis txhob convection
Convection txaus ntshai muaj feem xyuam rau lub sij hawm solidification. Nyias-walled thiab tuab-walled castings tsis cuam tshuam los ntawm convection txaus ntshai. Rau nruab nrab-thickness castings: txo convection txaus ntshai los ntawm casting qauv los yog txheej txheem;
Tsis txhob pub mis shrinkage upward;
Tig dhau tom qab nchuav.
8. Txo kev sib cais
Tiv thaiv kev sib cais thiab tswj nws nyob rau hauv tus txheej txheem ntau yam, los yog muaj pes tsawg leeg txwv cheeb tsam tso cai los ntawm tus neeg siv khoom. Yog tias ua tau, sim zam kev sib cais channel.
9. Txo cov kev ntxhov siab seem
Tom qab kev daws teeb meem ntawm lub teeb alloys, tsis txhob quench nrog dej (txias los yog dej kub). Yog hais tias qhov kev ntxhov siab ntawm lub casting tsis zoo li loj, siv polymer quenching nruab nrab lossis yuam cua quenching.
10.Muab cov ntsiab lus siv
Tag nrho cov castings yuav tsum tau muab qhov chaw siv cov ntsiab lus rau kev soj ntsuam thiab ua tiav.
Post lub sij hawm: May-30-2024
