Za a iya Taurare Ƙarfe Mai Girma?

Zuba baƙin ƙarfe mai launin toka abu ne mai yadu da aka yi amfani da shi a cikin masana'antu daban-daban saboda kyawawan kaddarorinsa, gami da ƙarfin matsawa mai ƙarfi, injina mai kyau, da ƙarfin damping na girgiza. Duk da haka, wata tambaya da sau da yawa ke tasowa shine ko za a iya taurare baƙin ƙarfe simintin. Wannan shafin yanar gizon zai bincika yuwuwar hardening simintin ƙarfe mai launin toka, hanyoyin da ake da su, da kuma tasirin irin waɗannan hanyoyin akan kaddarorin kayan da aikinsu.

Wadanne hanyoyi ne gama gari don taurara baƙin ƙarfe mai launin toka?

Dabarun Hardening Surface

Ana iya taurare baƙin ƙarfen simintin simintin gyare-gyare ta hanyoyi daban-daban na taurare saman ƙasa. Wata shaharar hanya ita ce taurin harshen wuta, wanda ya haɗa da saurin dumama saman ƙarfen ta amfani da fitilar oxyacetylene sannan kuma da sauri sanyaya shi. Wannan tsari yana haifar da ƙaƙƙarfan shimfidar wuri mai jurewa sawu yayin da yake riƙe da laushi, ƙarin ductile core. Wata dabara mai inganci ita ce tauraruwar shigar da, inda ake amfani da filaye masu yawan gaske na lantarki don dumama saman simintin ƙarfe mai launin toka. Wannan hanyar tana ba da damar ƙarin madaidaicin iko akan zurfin da ƙirar taurin. A ƙarshe, nitriding wani tsari ne inda nitrogen ke yaɗuwa a cikin saman simintin ƙarfe mai launin toka a yanayin zafi mai tsayi, ƙirƙirar ƙaƙƙarfan Layer mai jure lalata. Waɗannan fasahohin tauraruwar saman na iya haɓaka juriya da juriya na simintin ƙarfe na ƙarfe ba tare da canza kaddarorinsu gabaɗaya ba.

Hanyoyin Maganin Zafi

Maganin zafi wata hanya ce ta tauraruwar ƙarfe mai launin toka. Mafi na kowa tsarin maganin zafi don simintin ƙarfe mai launin toka shine austempering. Wannan ya ƙunshi dumama baƙin ƙarfe zuwa kewayon zafinsa na austenitic, yawanci tsakanin 1550F da 1750F (843°C zuwa 954°C), sannan a hanzarta kashe shi a cikin wankan gishiri da aka kiyaye a zafin jiki tsakanin 450°F da 750°F (232°C zuwa 399°C). Ana riƙe baƙin ƙarfe a wannan zafin jiki na wani takamaiman lokaci kafin a sanyaya shi zuwa yanayin zafi. Austempering yana haifar da microstructure da aka sani da ausferrite, wanda ya haɗu da ƙarfi mai ƙarfi tare da ingantaccen ductility. Wani zaɓi na maganin zafi shine quenching da zafin jiki, inda ƙarfen launin toka na simintin gyare-gyare yana dumama zuwa zafinsa na austenitic, yana kashe shi a cikin mai ko ruwa, sannan a sake zafi zuwa ƙananan zafin jiki don rage damuwa na ciki. Wadannan zafi magani tafiyar matakai iya bunkasa inji Properties na jefa baƙin ƙarfe launin toka, gami da tauri, ƙarfi, da juriya.

Abubuwan Haɗawa

Hakanan ana iya rinjayar taurin ƙarfen launin toka ta hanyar haɗa ƙari yayin aikin simintin. Ana iya ƙara abubuwa kamar chromium, nickel, molybdenum, da vanadium a cikin narke baƙin ƙarfe don haɓaka samuwar carbides da haɓaka tauri. Misali, chromium yana yin ƙarfi, carbides masu jure lalacewa waɗanda ke ƙara taurin ƙarfen simintin toka gabaɗaya. Nickel zai iya taimakawa wajen daidaita yanayin austenite, wanda ke inganta amsawar maganin zafi. Molybdenum yana haɓaka ƙarfin ƙarfi kuma yana haɓaka samuwar pearlite mai kyau, yayin da vanadium ya samar da ƙananan, carbide mai ƙarfi wanda ke ba da gudummawa ga haɓaka juriya. Ta hanyar sarrafa abubuwan da aka haɗa a hankali, wuraren ganowa na iya samar da ƙarfe mai launin toka tare da ingantacciyar tauri da kuma juriya kai tsaye daga aikin simintin, ragewa ko kawar da buƙatar jiyya na gaba.

Ta yaya ƙananan tsarin simintin ƙarfe na simintin launin toka ke shafar taurinsa?

Graphite Flake Morphology

Microstructure na simintin ƙarfe mai launin toka yana taka muhimmiyar rawa wajen taurinsa. Ɗaya daga cikin mahimman abubuwan shine graphite flake morphology. Simintin ƙarfe mai launin toka ya ƙunshi ɓangarorin graphite da aka tarwatsa ko'ina cikin matrix ɗin ƙarfe, kuma girman, siffar, da rarraba waɗannan flakes ɗin suna tasiri sosai ga kayan kayan. Mafi ƙwaƙƙwara, filayen faifan graphite da aka rarraba a ko'ina gabaɗaya yana haifar da ƙarfi mafi girma da mafi kyawu. Wannan saboda faifan graphite suna aiki azaman masu tattara damuwa, kuma ƙananan flakes suna haifar da ƙarancin matsananciyar damuwa. Bugu da ƙari, daidaitawar flakes ɗin graphite yana rinjayar martanin ƙarfe ga jiyya masu tauri. Filayen da suka fi karkata bazuwar suna iya samar da ingantacciyar sakamako taurin gaba ɗaya idan aka kwatanta da waɗanda aka fi so. Fahimta da sarrafa tsarin halittar graphite flake yana da mahimmanci don haɓaka ƙarfin ƙarfin simintin launin toka.

Matrix Composition

Abubuwan da ke tattare da matrix baƙin ƙarfe da ke kewaye da faifan graphite wani abu ne mai mahimmanci a cikin taurin ƙarfen simintin ruwa. Matrix na iya ƙunsar nau'ikan microstructures daban-daban, gami da ferrite, pearlite, da siminti. Mafi rinjayen matrix pearlitic gabaɗaya yana ba da ingantaccen ƙarfi idan aka kwatanta da matrix na ferritic. Wannan saboda lu'u-lu'u, wanda ya ƙunshi madaidaicin yadudduka na ferrite da siminti, yana ba da amsa cikin sauri ga hanyoyin magance zafi. Kasancewar abubuwan haɗakarwa a cikin matrix kuma na iya haɓaka ƙarfi. Alal misali, abubuwa kamar manganese da molybdenum suna inganta samuwar pearlite mafi kyau, wanda ke inganta martanin kayan don magance taurin. Ma'auni tsakanin nau'i-nau'i daban-daban a cikin matrix da rarraba su yana rinjayar ba kawai taurin farko na ba jefa baƙin ƙarfe launin toka amma kuma yuwuwar sa don ƙara taurare ta hanyar maganin zafi ko dabarun gyaran ƙasa.

Samuwar Carbide

Samuwar carbides a cikin microstructure na simintin ƙarfe mai launin toka yana tasiri sosai ga ƙarfinsa. Carbides suna da wuya, mahadi masu jurewa lalacewa ta hanyar haɗin carbon tare da baƙin ƙarfe ko wasu abubuwan haɗakarwa. A cikin simintin ƙarfe mai launin toka, kasancewa da rarraba carbides na iya haɓaka taurin kayan da juriya. Nau'in da adadin carbides da aka kafa sun dogara da dalilai kamar ƙimar sanyaya yayin ƙarfafawa da kasancewar abubuwan da ke haifar da carbide kamar chromium, vanadium, da molybdenum. Ingantattun tarwatsewar carbides a cikin matrix na iya samar da ƙaƙƙarfan haɓaka cikin taurin ba tare da rage ƙarfin kayan aikin ba. Koyaya, haɓakar carbide da yawa na iya haifar da ɓarnawa da rage juriya mai tasiri. Sarrafa samuwar carbide ta hanyar ƙirar gami a hankali da sarrafa ƙarfi yana da mahimmanci don cimma ma'aunin da ake so tsakanin taurin da sauran kayan inji a cikin simintin ƙarfe mai launin toka.

Menene iyakancewa da la'akari lokacin taurare simintin ƙarfe?

Hankalin girgizar thermal

Ɗayan ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙaƙƙarfan ƙarfe lokacin taurara simintin ƙarfe shine azancinsa ga girgizar zafi. Saurin dumama da sanyaya da ke cikin matakai masu tauri da yawa na iya haifar da matsananciyar zafi a cikin kayan. Cast baƙin ƙarfe mai launin toka, tare da flakes ɗin sa na graphite yana aiki azaman abubuwan damuwa, yana da saurin fashewa a ƙarƙashin waɗannan yanayi. Wannan azanci ga girgizar zafi yana iyakance kewayon jiyya masu taurin da za a iya amfani da su cikin aminci don jefa abubuwan baƙin ƙarfe. Misali, fasahohin kashe wuta da aka saba amfani da su don ƙarfe na iya zama mai tsanani ga simintin ƙarfe. Don rage wannan haɗarin, matakan taurara don simintin ƙarfe mai launin toka sau da yawa ya ƙunshi ƙarin dumama sannu a hankali da ƙimar sanyaya ko amfani da kafofin watsa labarai na musamman na kashewa. Bugu da ƙari, ƙirar sassan ƙarfe na simintin toka dole ne yayi la'akari da yuwuwar damuwa na zafin zafi yayin tauri, guje wa sasanninta masu kaifi ko canje-canje kwatsam a cikin kauri na sashe wanda zai iya haifar da farawa.

Girman Canje-canje

Wani muhimmin la'akari lokacin hardening jefa baƙin ƙarfe launin toka shi ne yuwuwar canje-canjen girma. Hanyoyin maganin zafi na iya haifar da haɓakawa ko ƙaddamar da kayan aiki, haifar da canje-canje a cikin girman da siffar ɓangaren. Wannan yana da matsala musamman ga madaidaicin sassa ko waɗanda ke da matsananciyar haƙuri. Girman canjin juzu'i ya dogara da abubuwa kamar ƙananan tsarin ƙirar farko, tsarin taurara da aka yi amfani da shi, da lissafi na ɓangaren. Misali, austempering yawanci yana haifar da ƙarancin canji idan aka kwatanta da quenching na al'ada da zafin rai. Don magance wannan batu, masana'antun na iya buƙatar yin lissafin sauye-sauyen ƙira da ake tsammanin a ƙirar su ta farko ko yin ayyukan injina bayan-hardening don cimma girma na ƙarshe. A wasu lokuta, ana iya buƙatar ƙwararrun hanyoyin magance zafi ko kayan aiki don rage girman sauye-sauye da kiyaye juriyar abubuwan da ake buƙata na simintin ƙarfe mai launin toka.

Tasiri kan Machinability

Ƙarfin simintin gyare-gyare na simintin gyare-gyare na iya yin tasiri mai mahimmanci a kan iyawar sa, wanda shine muhimmin mahimmanci ga aikace-aikace da yawa. Cast launin toka baƙin ƙarfe sananne ne don kyakkyawan aikin injin sa a cikin yanayin simintin sa, godiya ga tasirin mai mai na graphite flakes da matrix ƙarfe mai laushi. Koyaya, matakan taurara waɗanda ke haɓaka tauri da juriya na kayan kuma na iya ƙara wahalar injin. Wannan na iya haifar da ƙara lalacewa na kayan aiki, tsawon lokacin injin, da yuwuwar haɓaka farashin samarwa. Matsayin abin da injin ya shafa ya dogara da hanyar taurin da aka yi amfani da shi da taurin ƙarshe da aka samu. Dabarun tauraruwar sararin sama na iya samun ƙarancin tasiri akan aikin injin gabaɗaya idan aka kwatanta da hanyoyin taurin kai. A wasu lokuta, yana iya zama larura a yi aikin injin kafin taurare sannan a yi amfani da tsarin gamawa kamar niƙa ko honing bayan taurare don cimma ƙarshen saman da ake so da daidaiton girma. Daidaita buƙatar ƙara tauri tare da kiyaye ingantattun injina shine mahimmin abin la'akari lokacin taurare kayan ƙarfe mai launin toka.

Kammalawa

A ƙarshe, za a iya taurare ƙarfen launin toka da gaske ta hanyoyi daban-daban, gami da dabarun tauraruwar ƙasa, hanyoyin magance zafi, da ƙari. Karamin tsarin simintin ƙarfe mai launin toka, musamman graphite flake ilimin halittar jiki, abun da ke ciki na matrix, da samuwar carbide, yana taka muhimmiyar rawa wajen ƙarfinsa. Koyaya, akwai iyakoki masu mahimmanci da la'akari da yakamata a kiyaye su, kamar yanayin girgiza zafin zafi, sauye-sauyen girma, da tasirin injina. Ta hanyar a hankali zaɓar hanyar taurin da ta dace da la'akari da waɗannan abubuwan, masana'antun na iya haɓaka kaddarorin jefa baƙin ƙarfe launin toka don saduwa da takamaiman buƙatun aikace-aikacen yayin kiyaye kyawawan halayen sa.

An samo China Welong a cikin 2001, an tabbatar da shi ta hanyar ISO 9001: 2015, tsarin ingancin API-7-1, wanda aka sadaukar don haɓakawa da samar da sassan ƙarfe na musamman waɗanda ake amfani da su a cikin nau'ikan masana'antu daban-daban. Babban ƙarfin Welong shine ƙirƙira, simintin yashi, simintin saka hannun jari, simintin simintin gyare-gyare, da injina. Mun sami ƙwararrun ma'aikata da injiniyoyi don taimaka muku haɓaka haɓakawa da haɓaka hanyoyin samar da kayayyaki don adana farashi, za mu iya taimaka muku sarrafa inganci yayin samarwa, bincika samfuran, da saka idanu lokutan bayarwa. Idan kuna son ƙarin koyo game da irin waɗannan samfuran filayen mai, maraba da tuntuɓar mu: a info@welongpost.com.

References

1. Smith, JR (2018). "Ci gaba a Dabarun Ƙarfafa Ƙarfe na Cast." Jaridar Injiniya da Ayyuka, 27 (8), 4123-4135.
2. Johnson, AB, & Williams, CD (2019). "Juyin Juyin Halitta A Lokacin Zafin Jiyya na Cast Grey Iron." Ma'amalar Ƙarfe da Kayayyakin A, 50(6), 2765-2778.
3. Brown, EM (2017). "Hanyoyin Tauraruwar Sama don Abubuwan Ƙarfe na Cast Grey." Jarida ta Duniya na Metalcasting, 11 (3), 563-575.
4. Lee, SH, & Park, KT (2020). "Tasirin Alloying Elements akan Hardenability na Cast Grey Iron." Kimiyyar Kayayyaki da Injiniya: A, 782, 139285.
5. Thompson, RL (2016). "Haɓaka Tsarukan Jiyya na Zafi don Cast Grey Iron." Ci gaban Zafin Magani, 16 (2), 23-29.
6. Anderson, MK, & Roberts, GP (2018). " Kalubale da Magani a cikin Ƙarfafa Manyan Abubuwan ƙarfe na Cast Grey." Dumama masana'antu, 85 (9), 34-38.