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Narkewar Induction Vacuum
Vacuum simintin gyare-gyare (vacuum induction melting - VIM) an ƙera shi don sarrafa na'urori na musamman da na ban mamaki, kuma saboda haka yana ƙara zama ruwan dare yayin da waɗannan kayan haɓaka suna ƙara aiki. An ƙera VIM don narke da jefa superalloys da karafa masu ƙarfi, da yawa daga cikinsu suna buƙatar sarrafa injin don suna ɗauke da abubuwa masu hana ruwa gudu kamar su Ti, Nb da Al. Hakanan ana iya amfani dashi don bakin karfe da sauran karafa lokacin da ake son narke mai inganci.

Kamar yadda sunan ke nunawa, tsarin ya haɗa da narkewar ƙarfe a ƙarƙashin yanayi mara kyau. Ana amfani da shigar da wutar lantarki azaman tushen makamashi don narkar da ƙarfe. Narkewar shigarwa yana aiki ta hanyar haifar da igiyoyin wutar lantarki a cikin ƙarfe. Madogararsa ita ce coil induction, wanda ke ɗauke da madaidaicin halin yanzu. Ƙunƙarar igiyoyin wuta suna zafi kuma a ƙarshe narke cajin.

Tanderun yana kunshe da jaket na karfe mai sanyaya ruwa mai sanyaya iska, mai iya jurewa injin da ake buƙata don sarrafawa. An narkar da ƙarfen a cikin ƙugiya da aka ajiye a cikin kwandon shigar da ruwa mai sanyaya ruwa, kuma tanderun yawanci ana lullube shi da abubuwan da suka dace.

Karfe da gami da ke da babban kusanci ga iskar gas - musamman nitrogen da oxygen - galibi ana narke/gyara su a cikin tanderun shigar da ruwa don hana gurɓata / amsawa da waɗannan iskar gas. Don haka ana amfani da tsarin gabaɗaya don sarrafa kayan aiki masu tsafta ko kayan tare da juriya akan abubuwan sinadaran.

Tambaya: Me yasa ake amfani da narkewar induction narke?

A: An samo asali ne na narkewar shigar da injin don sarrafa na'urori na musamman da na ban mamaki kuma saboda haka yana ƙara zama ruwan dare yayin da waɗannan kayan haɓaka ke ƙara yin aiki. Yayin da aka ƙera shi don kayan kamar su superalloys, ana iya amfani da shi don bakin karfe da sauran karafa.
Ta yaya ainjin induction tanderuaiki?
Ana cajin kayan abu a cikin tanderun shigar da ruwa a ƙarƙashin injina kuma ana amfani da wutar lantarki don narkar da cajin. Ana yin ƙarin caji don kawo ƙarar ƙarfe na ruwa zuwa ƙarfin narkewar da ake so. Ƙarfe ɗin da aka narkar da shi ana tace shi a ƙarƙashin vacuum kuma ana daidaita sinadarai har sai an sami ainihin narkewar sunadarai.
Menene ke faruwa da ƙarfe a cikin injin daskarewa?
Musamman ma, yawancin karafa suna samar da Layer oxide akan duk wani saman da aka fallasa zuwa iska. Wannan yana aiki azaman garkuwa don hana haɗin gwiwa. A cikin sararin samaniya, babu iska don haka karafa ba za su samar da Layer na kariya ba.

Amfanin VIM Melting
Ya danganta da samfurin da tsarin ƙarfe, matakan vacuum yayin lokacin tacewa suna cikin kewayon 10-1 zuwa 10-4 mbar. Wasu fa'idodin ƙarfe na ƙarfe na sarrafa injin su ne:
Narkewa a ƙarƙashin yanayin da ba shi da iskar oxygen yana iyakance samuwar abubuwan da ba na ƙarfe ba kuma yana hana oxidation na abubuwa masu amsawa.
Nasarar kusancin haƙƙoƙin abun ciki da abubuwan gas
Cire abubuwan da ba a so tare da matsananciyar tururi
Cire narkar da iskar gas - oxygen, hydrogen, nitrogen
Daidaita daidai da daidaitattun abubuwan gami da narke zafin jiki
Narkewa a cikin injin motsa jiki yana kawar da buƙatar murfin slag mai karewa kuma yana rage yuwuwar gurɓataccen ƙwayar cuta ko haɗawa a cikin ingot.
Saboda wannan dalili, ayyukan ƙarfe irin su dephosphorization da desulphurization suna iyakance. VIM ƙarfe da farko an yi niyya ne ga halayen da suka dogara da matsa lamba, kamar halayen carbon, oxygen, nitrogen da hydrogen. Cire abubuwa masu cutarwa, masu canzawa, irin su antimony, tellurium, selenium da bismuth, a cikin tanderun shigar da injin yana da mahimmancin aiki.

Daidaitaccen saka idanu akan abin da ya dogara da matsa lamba na wuce haddi na carbon don kammala deoxidation misali ɗaya ne na haɓakar tsari ta amfani da tsarin VIM don samar da superalloys. Kayayyakin ban da superalloys an lalata su, daskararru ko zaɓaɓɓu a cikin tanderun shigar da ruwa don saduwa da ƙayyadaddun bayanai da garantin kaddarorin kayan. Saboda tsananin matsananciyar tururi na mafi yawan abubuwan da ba a so, ana iya rage su zuwa ƙananan matakai ta hanyar distillation yayin narkewar injin shigar da ruwa, musamman ga gami da babban ƙarfi a yanayin zafi mai girma. Don gami daban-daban waɗanda dole ne su dace da mafi kyawun buƙatun, injin induction tanderu shine tsarin narkewa mafi dacewa.

Ana iya haɗa waɗannan hanyoyin cikin sauƙi tare da tsarin VIM don samar da narke mai tsabta:
Sarrafa yanayin yanayi tare da ƙananan ɗigogi da ƙimar lalacewa
Zaɓin ingantaccen abu mai jujjuyawa don lulluɓi mai ɗaci
Tadawa da homogenization ta hanyar motsa jiki na lantarki ko tsabtace gas
Daidaitaccen sarrafa zafin jiki don rage girman halayen haɗari tare da narke
Ingantattun fasahohin lalata da kuma tacewa yayin aikin simintin gyare-gyare
Aikace-aikacen injin wanki mai dacewa da fasaha na tundish don mafi kyawun cire oxide.