Indlela yokuthuthukisa izakhiwo zemishini ye-cast grey iron?
Insimbi empunga iyingxube ye-iron-carbon lapho ingxenye engaphezulu inombala ompunga. Ngokulawula ukwakheka kanye nenqubo yokuqinisa, ikhabhoni ibonakala ngokuyinhloko ngendlela ye-flake graphite. Isakhiwo se-metallographic se-grey cast iron ikakhulukazi sakhiwe nge-flake graphite, i-metal matrix kanye ne-eutectic yomngcele wokusanhlamvu.
Ukuba khona kwe-flake graphite ensimbini empunga kulimaza ukuqhubeka kwensimbi futhi kwenza insimbi empunga ibe yinto ephukayo. Kodwa i-grey cast iron ingenye yezinto zokuqala zensimbi ezazisetshenziswa kakhulu.I-cast iron castings empungazinezakhiwo eziningi. Isikhathi eside, ekusebenzeni kokukhiqiza, sifingqe izinyathelo ezijwayelekile zokuthuthukisa amandla aqinile ensimbi empunga. Ngaphansi kwezimo ezithile, singakwazi futhi ukuthuthukisa ukusebenza kokusika, ukumelana nokugqoka nokusebenza kokushaqeka kokumuncwa kwensimbi empunga.
Emkhiqizweni wokuphonsa wangempela, iningi lensimbi empunga i-hypoeutectic. Ngakho-ke, ukuze kuthuthukiswe amandla ayo okuqina, amaphuzu alandelayo kufanele enziwe ngangokunokwenzeka:
1) Qinisekisa ukuthi insimbi empunga inama-austenite dendrites athuthuke kakhulu ngesikhathi sokuqina
2) Yehlisa inani le-eutectic graphite futhi uyenze isatshalaliswe ngokulinganayo nge-graphite yohlobo lwe-A emihle
3) Khulisa inani lamaqoqo e-eutectic
4) Ngesikhathi soguquko lwe-austenite eutectoid, zonke ziguquka zibe i-matrix ye-pearlite enhle
Emkhiqizweni wangempela we-grey cast iron castings, sivame ukusebenzisa lezi zinyathelo ezilandelayo ukuze sifinyelele imiphumela engenhla:
1) Khetha ukwakheka kwamakhemikhali okunengqondo
2) Shintsha ukwakheka kwenkokhiso
3) Insimbi encibilikisiwe ishise ngokweqile
4) Ukwelashwa kwe-inoculation
5) Ukulandelela noma i-alloying ephansi
6) Ukwelashwa kokushisa
7) Khulisa izinga lokupholisa ngesikhathi sokuguqulwa kwe-eutectoid
Izinyathelo eziqondile okufanele zithathwe zincike ohlotsheni lwe-cast iron cast iron, izakhiwo ezidingekayo kanye nezimo ezithile zokukhiqiza. Kodwa-ke, ngokuvamile kudingekile ukuthatha izinyathelo ezimbili noma ngaphezulu ukuze kuzuzwe ukusebenza okufunayo kwe-cast iron.
Isikhathi sokuthumela: Dec-28-2020