Tshawb nrhiav kev nce qib ntawm cov txheej txheem rau cov hlau ductile epc casting

Nodular cam khwb cia hlau, raws li ib yam ntawm cov khoom muaj zog cam khwb cia hlau nrog cov khoom nyob ze rau cov hlau, muaj qhov zoo ntawm cov nqi raug qis, zoo ductility, zoo heev qaug zog thiab hnav tsis kam, thiab zoo heev txhua yam khoom.  Nws yog dav siv hauv tshuab txaj, valve, crankshaft, piston, lub tog raj kheej thiab lwm qhov chaw ntawm lub cav tsheb.  Poob pwm casting thev naus laus zis yog ib hom kev siv tshuab tsis muaj qhov sib cais,  Qhov ze net txoj kev ntawm txoj kev precision casting tsis muaj xuab zeb yog dav siv nyob rau hauv zus tau tej cov cam khwb cia hlau, cam khwb cia hlau, aluminium alloy thiab magnesium alloy qhov chaw.  Poob hom ductile hlau, ua los ntawm  Vim nws cov ntsiab lus carbon siab, graphitization expansion thiab lwm yam ntxwv thaum lub sij hawm solidification, casting nto wrinkling, shrinkage kab noj hniav thiab porosity, carbon dub thiab lwm yam tsis xws luag yog feem ntau tshwm sim los ntawm cov txheej txheem tsis zoo.  Vim li ntawd,  Txhim kho txheej txheej ntawm epc yog qhov txuas tseem ceeb kom ntseeg tau tias cov khoom pov thawj.  

Hauv epc ntau lawm, qhov zoo ntawm txheej yog qhov tseem ceeb heev rau qhov zoo ntawm casting.  Epc txheej yuav tsum muaj qhov zoo permeability, lub zog, sintering thiab tev tawm  Xws li kev ua haujlwm.  Tam sim no, kev tshawb fawb feem ntau yog ua los ntawm kev ua haujlwm ntawm txheej txheej, kev sib cuam tshuam ntawm txheej txheej thiab EPS decomposition khoom, cov nyhuv ntawm txheej txheej ntawm casting zoo thiab txheej txheej txheej.  Kev tshawb fawb, nyob rau hauv cov txheej txheem txheej txheem kev txhim kho, ntxiv piv ntawm txheej txheej kev ua tau zoo, txheej txheej txheej txheej txheej txheej.  Los ntawm kev tsim thiab siv cov txheej txheem epc, kev tsim cov txheej txheem yuav tsum yog tus qauv  Cov txheej txheem kev npaj, siab casting tawm los;  Qhov poob pwm casting txheej lag luam yog chaotic, txheej txheej yog complex thiab kim, cov txheej txheem kev npaj yog cumbersome, thiab txawm lub mis muaj pes tsawg leeg yog tsis ncaj ncees lawm.  Nws tsis tsuas yog cuam tshuam cov txiaj ntsig ntawm epc casting, tab sis tseem cuam tshuam kev txhim kho ntawm EPC thev naus laus zis thiab txheej txheej kev lag luam.  

1 Cov txheej txheem ntawm cov hlau nplaum hauv epc casting  

Qhov ntsuas kub ntawm nodular cam khwb cia hlau feem ntau yog 1380 ~ 1480 ℃, me ntsis qis dua cov hlau castings. Qhov ntom ntawm nodular cam khwb cia hlau yog 7.3g / cm3, ntau dua li ntawm magnesium thiab txhuas alloy, yog li nodular cam khwb cia hlau kua  Cov nyhuv ntawm tshav kub thiab quab yuam ntawm txheej thaum lub sij hawm txhaws yog qhov tseem ceeb tshaj li ntawm magnesium thiab aluminium alloy.  Hauv cov txheej txheem hlau ductile ntawm epc, txheej txheej ua haujlwm vim tias lub tshuab nqus tsev tsis zoo  Nyob rau hauv lub xeev, ntawm ib sab, sab hauv ntawm txheej yuav tsum tau tiv thaiv lub zog dynamic thiab zoo li qub siab ntawm cov kub kub ductile hlau kua, thiab lub puab thiab sab nraud siab sib txawv ntawm lub txheej yog loj, thiab lub txheej yog yooj yim. thaum lub siab kub lub zog tsis txaus  Ua rau casting nto sag los yog casting deformation.  Nodular cam khwb cia hlau yog tus yam ntxwv los ntawm high casting kub thiab sai decomposition ntawm EPS. Gaseous khoom suav rau feem ntau ntawm cov khoom decomposition, nrog rau cov kua me me  Lub xeev cov khoom thiab cov khoom siv.  Cov khoom decomposition yog tsim nyob rau hauv ntau qhov ntau thiab sau tag nrho cov kab noj hniav, txhawm rau kom tsis txhob ua tsis tiav ntawm cov khoom decomposition kom tawm cov txheej, ua rau cov hlau ductile pores thiab wrinkles.  Txheej yuav tsum muaj huab cua zoo permeability rau qhov tshwm sim ntawm qhov tsis xws luag xws li tawv nqaij thiab carbon deposition.  Txheej txheej Performance index yuav tsum tau tswj nyob rau hauv ib tug tsim nyog ntau yam ntawm kev cuam tshuam lub zog thiab permeability ntawm txheej.  Lub refractoriness, sinter khoom, aggregate puab thiab particle loj muaj ncaj qha cuam tshuam rau lub zog thiab permeability ntawm epc txheej.  Nyob rau hauv tus txheej txheem ntawm txheej npaj, hluav taws-resistant pob txha  Kev xaiv cov khoom tseem ceeb tshwj xeeb.  

2 Formulation thiab txheej txheem ntawm ductile hlau txheej rau epc  

Refractory aggregate yog cov khoom tseem ceeb ntawm txheej txheej. Kev ua tau zoo ntawm cov txheej txheem yog ze ze rau lub cev thiab tshuaj lom neeg cov khoom ntawm refractory aggregate.  Kev siv cov kev ncua txwv tsis pub refractory aggregate nyob rau hauv cov xim  Sedimentation, kom lub txheej muaj thixotropy zoo.  Thaum lub sij hawm pouring txheej txheem, txheej yuav tsum undergo ib tug muaj zog thermal nyhuv, thiab cov compound siv sib txawv binders xyuas kom meej lub txheej txheej.  Cov txheej txheej muaj peev xwm tswj tau lub zog ntawm qhov kub thiab txias.  Txheej los ntawm raw cov ntaub ntawv mus rau txheej txheej los npaj, txheej thiab ziab peb cov txheej txheem tseem ceeb.  Cov txheej txheem zoo  Cov khoom siv ntxiv rau kev ua tau zoo, nws cov kev ua haujlwm thev naus laus zis kuj tseem ceeb heev, txheej txheej txheej txheej txheej txheem yuav tsum yooj yim, ua haujlwm yooj yim, txheej txheej du, tsis muaj pinhole, tawg thiab lwm yam.  

3 Txheej cov khoom ntawm EPC casting txheej txheem  

3.1 Txheej lub zog  

Raws li cov txheej txheem refractory txheej nyob rau saum npoo ntawm cov duab, lub vanishing hom txheej nrog lub zog siab tuaj yeem tsis tsuas yog txhim kho lub zog thiab nruj ntawm cov duab, tab sis kuj tuaj yeem siv los ua cov kua hlau thiab pwm.  Qhov cuam tshuam zoo ntawm cov xuab zeb kom ntseeg tau tias cov txheej txheem tuaj yeem tiv taus lub zog thiab zoo li qub thiab sab nraud adsorption siab coj los ntawm cov txheej txheem kub kub hlau ua kua filling, thiab txo cov neeg kho tshuab xuab zeb ntawm cov casting.  Yog li txheej lub zog yog qhov ntsuas tseem ceeb los ntsuas qhov ua tau zoo ntawm txheej.  

3.2 Kawm txog porosity thiab permeability ntawm coatings  

Molten hlau pouring, EPS zoo li nyob rau hauv qhov kev txiav txim siab kub sai gasification decomposition, nrog cov hlau ua kua rau pem hauv ntej, decomposition khoom los ntawm cov kab noj hniav los ntawm cov txheej paug, hlau kua  Qhov tso tawm ntawm pwm filling thiab decomposition khoom yog nyob rau hauv dynamic equilibrium.  Yog hais tias huab cua permeability ntawm cov txheej yog tsawg dhau, cov khoom decomposition tsis tuaj yeem tawm ntawm cov kab noj hniav hauv lub sijhawm, uas yuav ua rau lub qhov hws thiab cov pa roj carbon deposition tsis xws luag hauv qab ntawm daim tawv nqaij.  Thiab li ntawd.  Yog hais tias huab cua permeability ntawm txheej yog siab dhau lawm, pwm filling ceev ceev, yooj yim ua rau cov neeg kho tshuab xuab zeb sticking.  Nrog rau qhov nce ntawm txheej thickness, qhov cuam tshuam ntawm txheej ntom ntawm huab cua permeability yuav txo qis.  Siab permeability  Cov txheej muaj qhov loj dua qhov nruab nrab particle txoj kab uas hla thiab dav dua particle loj tis.  

4 Kev cuam tshuam ntawm txheej txheej ntawm qhov tsis xws luag ntawm nodular nrum hlau  

4.1 Kev cuam tshuam ntawm txheej txheej ntawm casting nto wrinkling defects  

Hauv kev poob hom casting, thaum EPS zoo li ua tau raws li cov txheej txheem decomposition ntawm high-temperature hlau kua, cov kua decomposition khoom tsim ntab rau saum npoo ntawm cov kua hlau los yog lo rau txheej, uas yog ib qho nyuaj rau decomposed tag nrho.  Thaum hlau  Thaum cov kua txias txias thiab solidified, qhov nro ntawm cov decomposed residue txawv ntawm cov kua hlau. Raws li cov casting shrinks, wavy los yog trickle folds yog tsim rau ntawm daim tawv nqaij casting.  

4.2 Qhov cuam tshuam ntawm txheej txheej ntawm casting carbon deposition defect  

Cov pa roj carbon deposition tsis xws luag yog tshwm sim los ntawm ntau npaum li cas ntawm generated carbon adsorbed rau saum npoo ntawm txheej, uas tsis tuaj yeem tawm ntawm cov kab noj hniav thiab adhered rau saum npoo ntawm casting. Nws yog feem ntau reflected nyob rau hauv lub casting li cov pa roj carbon zaj duab xis nrog ci nto.  Lub concave ntawm casting yog sau nrog carbon dub, thiab lwm yam.  Hauv kev tsim khoom ntawm epc, casting qhov tsis xws luag yog ze ze rau cov khoom zoo li, casting muaj pes tsawg leeg, txheej thiab casting txheej txheem.  

5 Kev tshawb fawb kev taw qhia ntawm cov txheej txheem rau cov hlau ductile epc casting  

Nodular cam khwb cia hlau poob pwm casting, vim nws qhov kub siab pouring, ua npuas ncauj zoo li loj roj tsim, tsis zoo compaction casting.  Lub txheej ntawm nodular cam khwb cia hlau yog raug rau molten hlau thaum lub sij hawm pwm filling  Muaj zog scour nyhuv thiab sab hauv thiab sab nraud siab sib txawv, cov txheej yuav tsum muaj lub zog zoo ntawm qhov kub thiab txias, txhawm rau tiv thaiv cov txheej txheem hlau ua kua ua rau yaig ntawm txheej thiab cuam tshuam rau lub rooj casting.  Deg zoo, yog li cov muaj pes tsawg leeg thiab cov khoom ntawm refractory aggregate thiab kev cuam tshuam ntawm additives ntawm lub zog ntawm txheej ua tus yuam sij los txhim kho kev ua tau zoo ntawm txheej.  

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Post lub sij hawm: Nov-05-2021