Continuous casting tundish molten steel induction dumama kayan aiki

Labarin 1

Tundish narkakkar karfe induction fasahar kayan aikin dumama an haɓaka tare da ci gaba da ci gaba da fasahar simintin simintin gyare-gyare, haɓaka buƙatun ingancin ƙarfe, buƙatar ceton makamashi da rage yawan amfani, da daidaitawa na tacewa waje da ci gaba da tafiyar da simintin. Matsayin ƙarfe daban-daban suna da buƙatu daban-daban akan AT na narkakken ƙarfe superheat. Don faranti mai kauri, don rage raguwa na ciki da kuma sako-sako da cibiyar, AT ya zama ƙasa (5 ~ 200T); don faranti na bakin ciki mai sanyi, ana buƙatar saman don samun inganci mai kyau. Mafi girma (15 ~ 300 ℃). Koyaya, narkakkarfin superheat ɗin ƙarfe dole ne a daidaita shi a cikin takamaiman kewayon don rage haɓaka. Wannan wani yanayi ne da ya zama dole don tabbatar da ingantaccen ci gaba na ci gaba da samar da simintin gyaran kafa, hana toshewar bututun ruwa ko hana hatsarorin zubewa, da tabbatar da ingancin tulun simintin gyaran kafa. Haɓakawa na aikin dumama na tundish yana ba da damar sarrafa zafin narkakken ƙarfe a tsaye. Yanayin zafi na narkakkar karfe na ladle daban-daban yana jujjuyawa, wanda ke da mummunan tasiri akan ci gaba da aikin simintin gyare-gyare, kuma dumama na tundish na iya rama shi har zuwa wani lokaci. Duk da haka, dole ne a nuna cewa kiyaye tsayayyen narkakkar karfe superheat ya dogara ne akan yanayin zafin bugun da ya dace da tsarin daidaitawa bayan bugawa, kuma dumama na tundish zai iya taka karin rawa kawai. Duk da haka, dumama da sarrafa narkakkar karafa a cikin tundish yana ci gaba da samun kulawa daga al’umman masana’antar. Wasu kasashe da Japan, Amurka, Birtaniya, da Faransa suka wakilta sun yi nasarar gudanar da bincike a kan fasahar dumama karafa tun daga shekarun 1970 zuwa 1980. Kamfanin Kawasaki na Japan ya fara haɓakawa kuma ya sami takardar shaidar mallakar Jafan tun farkon 1982. A halin yanzu, fasahar dumama karfen tundish ta sami nasarar haɓakawa ko kuma tana haɓakawa yawanci tana ɗaukar hanyar dumama jiki. A cikin hanyar dumama jiki, ana amfani da makamashin lantarki azaman tushen zafi kuma ana canzawa bisa ga ƙarfin lantarki. Ana iya raba hanyoyin daban-daban zuwa: Kayan aikin induction na lantarki na lantarki, dumama plasma, dumama electroslag da fasahar dumama yumbu na DC.

Tundish induction kayan aikin dumama yana da halaye masu zuwa:

(1) Gudun dumama da sauri da ingantaccen dumama wutar lantarki;

(2) Wasu nau’ikan kuma suna da wani tasiri na motsa jiki na lantarki, wanda ke taimakawa wajen kawar da abubuwan da aka haɗa;

(3) Tsarin zafin jiki yana da sauƙin sarrafawa, kuma abu mafi mahimmanci shine don sarrafa mafi daidaitaccen zafi na narkakken ƙarfe;

(4) Ƙarfin dumama yana iyakance ta zurfin matakin ruwan tundish. Sai kawai lokacin da narkakken ƙarfe a cikin tundish ya taru zuwa wani zurfin zurfi, dumama na iya ci gaba da sauƙi.

Akwai nau’o’in kayan aikin induction na tundish da yawa:

(1) Dangane da nau’in inductor, ana iya raba shi zuwa kayan aikin dumama induction mara tushe da kayan aikin dumama induction;

(2) Dangane da tsarin inductor, ana iya raba shi zuwa nau’in nau’in kuskure da nau’in rami (tsagi, narkakkar rami) induction dumama kayan aiki;

(3) Dangane da ɓangaren dumama, ana iya raba shi zuwa dumama gida da dumama gabaɗaya.

2 Ci gaba da yin simintin tundish narkakkar karfe electromagnetic induction dumama kayan aikin

2. 1 Tundish electromagnetic induction dumama kayan aikin da ya dace da na’ura mai ci gaba a kwance

Tundish electromagnetic induction induction kayan dumama wanda yayi daidai da injin ci gaba da simintin kwance ana nuna shi a hoto 10-7.

Yanzu an bayyana tsarin samar da masana’anta na bakin karfe.

Hoto 10-7 Tundish electromagnetic induction dumama kayan aikin da ya dace da injin ci gaba da simintin a kwance

Bayan kowane nau’in bakin karfe an baje, an ɗora su a cikin tanderun induction na 5t guda uku daga tankin ciyarwa tare da cranes. Bayan an narkar da tarkacen karfen zuwa zafin da ake bukata (kimanin 1650°C), za a zuba narkakken karfen da ke cikin tanderun induction a cikin ladle, sannan a yi amfani da shi Motar ta zuba narkakken karfen a cikin tanderun AOD mai lamba 8, inda aka lalata ta. slagging, dephosphorization da sulfur cirewa, da daidaitawa na gami abun da ke ciki (yafi Cr, Ni), sa’an nan narkakkar karfe (na abun da ke ciki da kuma zafin jiki cika da bukatun) Saka narkakkar karfe a cikin ladle da kuma amfani da crane don zuba. narkakkar karfe a cikin ladle cikin ladle na 8t electromagnetic induction dumama kayan aikin. Ruwan bakin karfe mai dumama ta hanyar adana zafi ana zana shi kuma a jefa shi cikin wani shinge mai zagaye ta na’ura mai ci gaba da yin simintin kwance a kwance kuma a karshe an tura shi cikin gadon sanyaya ta hanyar kafawa da yankewa. .

Abu na zahiri na 8t electromagnetic induction dumama kayan ladle yana nunawa a cikin hoto 10-8.

8t da 14t tundish electromagnetic induction dumama kayan aiki, tundish induction dumama kayan aikin na iya sarrafa zafin narkakken ƙarfe daidai da daidai (daidaitaccen kewayon kuskure shine ± 5 ~ 6 ℃), don haka tabbatar da ingancin billet. Bugu da kari, lokacin daidaita yanayin zafi na tundish kuma za’a iya tsawaita shi yadda ya kamata, yana nuna kyakkyawan tasirin shigar da kayan dumama.

2. 2 Tundish na’urar induction dumama na’ura na baka ci gaba da simintin gyaran kafa

Na’urar tundish na induction dumama na’ura na arc ci gaba da simintin simintin an nuna a cikin Hoto 10-9.

Bayan da arc billet ci gaba da caster ya karɓi na’urar dumama na’urar induction na lantarki tundish, ana iya saukar da zafin bugun bugun (misali, yana iya zama.

Hoto 10-9 Tundish na’urar induction dumama na’ura mai ci gaba da simintin simintin gyare-gyare

Daga 1700 ° C zuwa 1650 ° C), wannan ba kawai yana taimakawa wajen inganta rayuwar rufin ƙarfe na ƙarfe ba (mai canzawa, wutar lantarki ko tanderun shigar da wutar lantarki), amma kuma yana daidaita zafin narkakken ƙarfe a ci gaba da simintin gyare-gyare kuma yana ba da garantin ingancin ci gaba. yin jita-jita.

Dangane da gabatarwar da ke sama, ana iya la’akari da cewa ci gaba da simintin tundish Magnetic induction kayan dumama sabuwar fasaha ce mai ceton kuzari da kuma yanayin muhalli. Ɗaukar wannan na’urar kyakkyawan aiki ne na canza fasaha don masana’antun ƙarfe, kuma ya cancanci haɓakawa da amfani.

Hoto 10-10 yana nuna 16t tundish electromagnetic induction dumama kayan aikin.

Hoto 10-10 16t tundish electromagnetic induction dumama kayan aikin

Hoto na 10-11 zane ne na tsari na tundish na 14t induction kayan dumama.

Hoto 10-11 Tsarin tsari na tundish na 14t induction kayan dumama