Samfurin Simintin Simintin gyare-gyare na Ƙarfe na Musamman

Yawancin simintin gyare-gyaren simintin gyare-gyare na simintin gyare-gyare ana yin sukore yashi simintin gyare-gyareko yashi mai rufi resinharsashi mold simintin gyaran kafatafiyar matakai a wurin ginin simintin gyare-gyare na RMC.

Simintin gyare-gyare sune abubuwan ƙarfe na ƙarfe waɗanda ke da abun ciki na carbon fiye da 2%. Kodayake simintin ƙarfe na iya samun adadin carbon tsakanin 2 zuwa 6.67, iyakar aiki yawanci tsakanin 2 da 4%. Waɗannan suna da mahimmanci musamman saboda kyawawan halayen simintin su. Iron simintin gyare-gyaren launin toka, ƙarfen simintin gyare-gyare (wanda kuma ake kira baƙin ƙarfe nodular cast iron ko spheroidal graphite iron) da simintin simintin gyare-gyare sune babban simintin ƙarfe uku a cikin ginin.

Ƙarfin simintin gyare-gyare yana da carbon kyauta wanda ke samuwa a cikin nau'i na nodules a cikin matrix na siminti da ferrite. Ana samun wannan ne ta hanyar sanyaya simintin farko ta yadda za a samar da duk farin ƙarfe na simintin ƙarfe, sannan kuma tsarin sarrafa zafi mai sarrafawa ta yadda wasu siminti za su rikiɗe zuwa ferrite da nodules na carbon kyauta. Wannan abu ya fi ductile fiye da baƙin ƙarfe simintin ƙarfe. Wannannau'i ya dace da abubuwan da ke da ƙananan kauri mai ƙanƙara tun lokacin da duk farin ƙarfen simintin ƙarfe zai zama farkon farkon baƙin ƙarfe.

Simintin gyare-gyaren Shell wani tsari ne wanda aka ba da izinin yashi gauraye da resin thermosetting don saduwa da farantin ƙirar ƙarfe mai zafi, ta yadda za a sami harsashi mai ƙarfi da ƙarfi a kewayen ginshiƙi. Sa'an nan kuma a cire harsashi daga tsarin kuma a cire cope da ja tare a ajiye a cikin flask tare da kayan da ake bukata na baya kuma a zuba narkakken karfe a cikin mold.

Gabaɗaya, bushe da yashi mai kyau (90 zuwa 140 GFN) wanda ba shi da yumbu gaba ɗaya ana amfani dashi don shirya yashin ƙera harsashi. Girman hatsin da za a zaɓa ya dogara da ƙarshen saman da ake so akan simintin. Matsakaicin girman hatsi yana buƙatar babban adadin guduro, wanda ke sa ƙirar ta yi tsada.

Fa'idodin Simintin Rufe Sand Shell Mold:
1. Simintin gyare-gyaren harsashi gabaɗaya sun fi girman simintin gyare-gyare fiye da yashi. Yana yiwuwa a sami juriya na +0.25 mm don simintin ƙarfe da +0. 35 mm don simintin ƙarfe mai launin toka a ƙarƙashin yanayin aiki na yau da kullun. A cikin yanayin ƙirar harsashi na kusa, ana iya samun shi a cikin kewayon +0.03 zuwa +0.13 mm don takamaiman aikace-aikace.
2. Za a iya samun wuri mai laushi a cikin simintin harsashi. Ana samun wannan da farko ta mafi girman girman hatsi da aka yi amfani da shi. Matsakaicin kewayon rashin ƙarfi shine na tsari na 3 zuwa 6 microns.
3. Matsakaicin kusurwoyi, waɗanda suka yi ƙasa da simintin yashi, ana buƙata a cikin ƙirar harsashi. Rage kusurwoyin daftarin zai iya kasancewa daga 50 zuwa 75%, wanda ke adana tsadar kayan aiki da kuma farashin injina na gaba.
4. Wasu lokuta, ana iya kawar da maƙala na musamman a cikin gyare-gyaren harsashi. Tun da yashi yana da ƙarfi mai ƙarfi za a iya ƙirƙira ƙirar ta yadda za a iya kafa kogon ciki kai tsaye tare da buƙatun harsashi.
5. Har ila yau, sassa na bakin ciki sosai (har zuwa 0.25 mm) na nau'in kawunan silinda mai sanyaya iska za a iya yin shi da sauri ta hanyar gyare-gyaren harsashi saboda ƙarfin yashi da ake amfani da shi don yin gyare-gyare.
6. Permeability na harsashi yana da girma kuma sabili da haka babu iskar gas da ke faruwa.
7. Ana buƙatar amfani da yashi kaɗan.
8. Injiniya yana yiwuwa a shirye saboda sauƙin sarrafawa da ke cikin gyare-gyaren harsashi.