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Yuav Ua Li Cas Txhim Kho Cov Mechanical Khoom ntawm Grey Nrum Hlau Castings

Yuav ua li cas txhawm rau txhim kho cov cuab yeej ntawm lub zog ntawm cam khwb cia grey hlau?

Grey cam khwb cia hlau yog hlau-carbon alloy nyob rau hauv uas seem seem yog grey. Los ntawm kev tswj ntawm qhov muaj pes tsawg leeg thiab cov txheej txheem ua kom muaj zog, cov pa roj carbon ntau tsuas yog tshwm hauv cov qauv ntawm flake graphite. Cov txheej txheem xim hlau ntawm grey cam khwb cia hlau yog tsuas yog tsim ntawm flake graphite, hlau matrix thiab lis ciam ciam eutectic.

Lub hav zoov ntawm flake graphite nyob rau hauv grey cam khwb cia hlau txav qhov pib txuas ntxiv ntawm cov hlau thiab ua rau grey cam khwb cia hlau ua cov khoom tawg. Tab sis grey cam khwb cia hlau yog ib qho ntawm qhov pib thiab siv cov khoom siv hlau ntau tshaj plaws. Grey cam khwb cia hlau muaj ntau lub zog. Tau ntev, hauv kev tsim ntau lawm, peb tau nthuav qhia qee qhov kev ntsuas kom txhim kho lub zog tensile ntawm grey cam khwb cia hlau. Nyob rau qee qhov xwm txheej, peb tseem tuaj yeem txhim kho qhov txiav kev ua tiav, hnav tsis kam thiab kev poob siab kev ua haujlwm ntawm grey cam khwb cia hlau.

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Hauv kev coj ua ntau lawm, qhov loj tshaj plaws ntawm grey cam khwb cia hlau yog hypoeutectic. Yog li, txhawm rau txhim kho nws lub zog tensile, cov ntsiab lus hauv qab no yuav tsum tau ua kom ntau li ntau tau:

1) lav lub grey cam khwb cia hlau muaj ntau thiab ntau qhov pib tsim austenite dendrites thaum lub sijhawm solidification
2) Txo cov nyiaj ntawm eutectic graphite thiab ua kom nws tusyees faib nrog nplua A-hom graphite
3) Nce tus naj npawb ntawm eutectic pawg
4) Thaum lub sijhawm austenite eutectoid kev hloov pauv, txhua yam hloov mus rau qhov ua kom zoo pearlite matrix

Hauv kev coj ua tiag tiag ntawm cov hlau grey castings, peb feem ntau siv cov kev ntsuas hauv qab no kom ua tiav cov txiaj ntsig saum toj saud:
1) Xaiv cov tshuaj lom neeg tsim nyog
2) Hloov cov khoom sib tw ntawm kev sib tw
3) Ua kom siv cov hlau molten
4) Kev tiv thaiv kab mob
5) Kab lus lossis tsis tshua muaj alloying
6) Kev kho cua sov
7) Nce tus nqi txias dua thaum lub sijhawm hloov eutectoid

Cov kev ntsuas tshwj xeeb uas yuav tsum tau ua yog nyob ntawm hom ntawm grey cam khwb cia hlau cam, cov khoom uas yuav tsum tau ua thiab cov kev ua haujlwm tshwj xeeb. Txawm li cas los xij, nws yog feem ntau yuav tsum tau ua ob qho lossis ntau qhov ntsuas kom ua tiav qhov xav tau ntawm kev ua haujlwm ntawm cov hlau cam.

 


Lub sij hawm tshaj tawm: Kaum Ib Hlis-28-2020