Casting yog ib qho ntawm cov txheej txheem tseem ceeb hauv kev tsim khoom, tab sis cov txheej txheem kev siv tshuaj thiab cov tshuaj lom neeg feem ntau ua rau muaj zog thiab lub neej ntawm workpieces. Daim ntawv no yuav delve rau hauv kev tsim cov tshuab ua xws li shrinkage, roj teeb kom pab ua kom txhim kho cov qoob loo kom zoo dua los ntawm cov khoom siv.
Kev faib tawm thiab kev cuam tshuam ntawm cov kev sib cais
Casting cov tsis xws luag tuaj yeem faib ua ob pawg: shrinkage tsis xws luag thiab roj tsis xws luag:
Shrinkage qhov: Qhov ntim shrinkage ntawm cov hlau yog thaiv thaum nws ua tau zoo (xws li shrinkage qhov thiab shrinkage).
Cov tshuaj tua hluav taws xob roj teeb: roj hauv cov hlau tsis tau tso tawm hauv lub sijhawm (xws li porosity, cua qhov).
These defects can reduce the beauty of the workpiece at best and cause structural failure at worst, resulting in safety risks.
Kev tsom xam ntawm shrinkage tsis xws luag
1. Txhawj Ua Si
Cause: thaum lub ntim ntawm cov ntawv cog lus hlau los ntawm kua rau khoom, yog tias txhaws tsis txaus, qhov yog tsim nyob rau thaj chaw kawg.
Cov yam ntxwv: feem ntau tsis xwm txheej, feem ntau tshwm hauv tuab phab ntsa lossis cov kev sib tshuam.
Cov ntaub ntawv: Vim yog tus tsim tsis raug ntawm lub ntsej muag casting, muaj lub ntsej muag zoo li lub cev ntawm lub zog tsheb, ua rau hauv pob ntawv SEAR.
2. Shrinkage porosity
Cause: Kev sib cog lus Micro-daim ntawv cog lus tsis tau ntim nrog cov kua hlau, sib sau cov honeycomb ntawm cov hws me me.
Raug mob: txo cov ntom ntom ntawm cov khoom thiab ua lub hauv paus chiv keeb ntawm kev qaug zog tawg.
Kev daws:
Tus qauv siv ntawm cov pa nchuav tau zoo, thiab cov hauv paus ntsiab lus ntawm cov kev ua kom muaj txiaj ntsig yog kev qhia los qhia cov kev hloov pauv.
Kho Alloy Composition (xws li nce zuj zus silicon cov ntsiab lus tuaj yeem txo cov shrinkage ntawm cam khwb cia hlau).
Siv hlau txias lossis rwb thaiv tsev kom tswj tau tus nqi txias hauv zos.
Tsim thiab countermeasures ntawm cov roj tsis xws luag
1. Xyoob
Cause: Cov dej nyob hauv cov ntawv moulding yog vaporized los ntawm tshav kub, lossis roj ua los ntawm kev rhuav tshem ntawm cov khoom siv los ua cov hlau.
Cov duab: du spherical lossis pear-puab qhov nyob rau saum npoo, feem ntau nyob rau ntawm sab saud ntawm lub pov.
2. Gas Qhov
Cause: hydrogen, nitrogen thiab lwm yam roj yaj yaj nyob rau hauv cov txheej txheem smelting yog precipitated thiab sib sau ua ke thaum muaj kev sib sau ua ke.
Nta: me me me tab sis tuab faib, feem ntau pom hauv txhuas alloy casts.
Kev daws:
Smelting tswj: Siv Degassing tus neeg sawv cev (xws li Hexachathane) thiab lub tshuab nqus tsev smelting.
Kev Txhim Kho Cov Txheej Txheem: Nce qhov ua kom sov kom ntev rau lub sijhawm ntev ntawm lub sijhawm, thiab nce cov kev tsim qauv channel.
Kev tswj xuab zeb: Tswj cov ntsiab lus dej (tsawg dua los yog sib npaug rau 5%), xaiv cov roj uas muaj roj muaj roj av tsawg dua.
Kev Tshawb Fawb Txog Kev Siv Tshuab thiab Tiv Thaiv Kev Tiv Thaiv
Nondestructive Testing (NDT):
X-duab tshav dav dav-lub sij hawm kuaj: qhov chaw tseeb ntawm kev tsis taus sab hauv.
Kev Kuaj Ntawv: Nrhiav tau ntawm micro-pob txha thiab Pore faib.
Digital Analog:
Software xws li protecture yog siv los twv seb cov kev pheej hmoo ntawm cov chaw cog lus thiab ua kom zoo rau cov txheej txheem tsis sib xws.
Saib xyuas:
Nruab ib qho hluav taws xob infrared thermal immerer los saib xyuas cov txheej txheem salorification thiab kho tus nqi txias txias nyob rau hauv lub sij hawm.