Ungazithuthukisa kanjani izakhiwo zemishini yensimbi eyimpunga?
Insimbi eyimpunga yensimbi i-iron-carbon alloy lapho ingxenye yesigaba iba mpunga. Ngokulawulwa kokuqanjwa kanye nenqubo yokuqinisa, ikhabhoni ivela kakhulu ngesimo se-flake graphite. Isakhiwo se-metallographic se-grey cast iron sakhiwe kakhulu nge-flake graphite, i-matrix yensimbi kanye ne-eutectic emngceleni wokusanhlamvu.
Ukuba khona kwe-flake graphite ku-grey cast iron kuqeda ukuqhubeka okuyisisekelo kwensimbi futhi kwenza i-grey cast iron ibe yinto ekhukhulayo. Kodwa i-grey cast iron ingenye yezinto zokuqala zensimbi ezisetshenziswa kakhulu. Insimbi eyimpunga inezinto eziningi. Isikhathi eside, ekusebenzeni kokukhiqiza, sifingqe izindlela ezithile ezijwayelekile zokuthuthukisa amandla wokuqina wensimbi yempunga. Ngaphansi kwezimo ezithile, singabuye sithuthukise ukusebenza kokusika, ukugqoka ukumelana nokusebenza kokushaqeka kwensimbi yempunga.
Ekukhiqizweni kwangempela kokukhishwa, iningi lensimbi elimpunga yi-hypoeutectic. Ngakho-ke, ukuze uthuthukise amandla ayo okuqina, amaphuzu alandelayo kufanele enziwe ngangokunokwenzeka:
I-1) Isiqinisekiso sokuthi i-iron cast yensimbi inama-dendrites amaningi asathuthukile ngesikhathi sokuqina
2) Nciphisa inani le-eutectic graphite bese uyenza ngokulinganayo isatshalaliswa nge-A-type graphite enhle
3) Khulisa inani lamaqoqo eutectic
I-4) Ngesikhathi sokuguqulwa kwe-austenite eutectoid, konke kuguquka kube yiprix ye-pearlite enhle
Ekhiqizweni langempela le-grey cast cast castings, sivame ukusebenzisa izinyathelo ezilandelayo ukufeza imiphumela engenhla:
1) Khetha ukwakheka kwamakhemikhali okufanelekile
2) Shintsha ukwakheka kwenkokhiso
I-3) Insimbi encibilikisiwe eshisiwe
4) Ukwelashwa kwe-Inoculation
5) Ukulandela noma ukubopha okuphansi
6) ukwelashwa Heat
7) Khulisa izinga lokupholisa ngesikhathi sokuguqulwa kwe-eutectoid
Izinyathelo ezithile ezizothathwa zincike ohlotsheni lokuphonsa izinsimbi ezimpunga, izakhiwo ezidingekayo nezimo ezithile zokukhiqiza. Kodwa-ke, kuyadingeka kaningi ukuthatha izinyathelo ezimbili noma ngaphezulu ukufeza ukusebenza okufunwayo kwensimbi yensimbi.
Isikhathi Iposi: Dec-28-2020