Preforging dumama hanya ce mai mahimmanci a cikin dukatsarin ƙirƙira, wanda ke da tasiri kai tsaye wajen ingantawaƙirƙira yawan aiki, tabbatar da ƙirƙira inganci da rage yawan amfani da makamashi.Zaɓin da ya dace na zafin jiki na dumama zai iya yin billet ɗin da aka kafa a cikin mafi kyawun yanayin filastik.Ƙirƙirar Single a cikintsarin ƙirƙirazuwa karfe blank ja dumama, bisa ga yin amfani da daban-daban zafi kafofin, za a iya raba lantarki dumama da harshen dumama kashi biyu.

Na farko, lantarki dumama
Ana amfani da dumama wutar lantarki don dumama karfen ƙarfe donƙirƙirata hanyar mayar da makamashin lantarki zuwa makamashin zafi.Na'urar da ke canza makamashin lantarki zuwa zafi zuwa dumama karafa ana kiranta wutar lantarki.Abubuwan da ake amfani da su na dumama na lantarki shine cewa saurin dumama yana da sauri, yanayin zafi na tanderun zafi yana da sauƙin sarrafawa, oxidation da decarbonization sun ragu, kuma yana da sauƙin gane injiniyoyi, aiki da kai da kuma kyakkyawan yanayin aiki.Rashin hasara shi ne cewa girman da siffar gyare-gyaren gyare-gyare mara kyau ba shi da karfi, tsarin kayan aiki yana da wuyar gaske, farashin zuba jari ya fi girma fiye da dumama harshen wuta, aiki da amfani da buƙatun fasaha suna da girma.

Biyu, dumama harshen wuta
Har ila yau dumama harshen wuta shine mafi yawan hanyar dumama.Dumama harshen wuta yana amfani da ƙarfin zafin da ake samu ta hanyar konewar mai don dumama billet ɗin ƙarfe.Man Fetur Coal, Coke, Dizal mai, Gas, Gas, da dai sauransu. Amfanin dumama harshen wuta shine cewa tushen mai ya dace, tanderun yana da sauƙi don ginawa, farashin dumama yana da ƙasa, kuma yana da amfani sosai ga ƙarfe. billet da ake amfani da su wajen ƙirƙira ƙirƙira.Saboda haka, ana amfani da wannan dumama sosai wajen samar da manyan, matsakaita da ƙanana daban-dabanƙirƙira.An yi amfani da waɗannan hanyoyin dumama sosai wajen yin ƙirƙira.Rashin hasara shi ne cewa yanayin aiki ba shi da kyau, saurin dumama yana jinkirin, ingancin dumama yana da wuyar sarrafawa.