TSARIN CIN ARZIKI (RASAR CIN KASHE).
Tsarin simintin saka hannun jari hanya ce ta tattalin arziƙi don samar da sassa na ƙarfe tare da ingantacciyar madaidaicin girma da ƙare saman ƙasa, rage ko kusan kawar da ƙarin ayyukan inji.Yana ɗaya daga cikin sanannun tsarin ganowa.Shaidun archaeological a wurare daban-daban na duniya sun nuna cewa tsarin zuba jari ya fara a zamanin Bronze Age, kimanin shekaru 4,000 BC.Tsarin masana'antu ne tare da ingantaccen tsarin sarrafawa mai tsafta don kowane matakin masana'antu guda takwas masu zuwa.
Wannan mataki na farko ya ƙunshi ƙirƙirar ƙirar da za a iya zubar da zafi ta hanyar allurar kakin zuma a cikin mold (ƙarfe mutu.)
Alamar kakin zuma gabaɗaya suna da ainihin siffar geometric iri ɗaya kamar ɓangaren simintin da aka yi niyya.Tsarin allurar kakin zuma yana samar da wasu burrs a cikin tsari kuma ya zama dole a cire su a hankali.Ko da ƙananan ɓangarorin da ba za a iya gane su ba waɗanda ba na ɓangaren ƙarshe ba ana cire su a cikin wannan tsari.
Bayan an gama cirewa, ana haɗa tsarin kakin zuma, ta hanyar yanayin zafi, ana haɗa su a kan mai gudu (wanda aka yi masa allura) don samar da itacen simintin.
Nasarar yadudduka na musamman slurry yumbu refractory kayan ana amfani da itacen tare da tsananin kula da zafin jiki da zafi.
Da zarar yumbu ya shirya kuma ya bushe, ana sanya dukan bishiyar a cikin tsarin autoclave don cire yawancin kakin zuma ta hanyar matsa lamba don zama kawai nau'in harsashi na yumbu.Duk wuraren da a baya cike da kakin zuma, yanzu babu kowa
Don samun ƙarfin injina mafi girma da juriya na zafin zafi, harsashi ya ƙera bishiyoyin da ba komai a cikin tanderun wuta a cikin babban zafin jiki na kusan 1,100 C. (2,000 F).
Bayan calcination tsari, yumbu harsashi molds a hankali cika da ruwa karfe, wanda nauyi gudana a cikin duk ciki mold, forming da m workpieces, duk a haɗe zuwa sprue.
A m workpieces sa'an nan yanke daga tress, sami takamaiman karewa (nika, mikewa, zafi magani, machining, engraving, da dai sauransu), kuma, bayan haka, je zuwa wani m karshe ingancin dubawa kafin marufi da shipping zuwa costumer.
