A cikin yanayin zafi na ƙirƙira, saboda babban ƙarfin wutar lantarki da dogon lokacin rufewa, yawan amfani da makamashi yana da girma a cikin duka tsari, a cikin dogon lokaci, yadda za a adana makamashi a cikin yanayin zafi na ƙirƙira ya kasance. matsala mai wahala.

Abin da ake kira "zero insulation" quenching, shine nunawa ga ƙirƙira dumama, samansa da ainihinsa don isa ga zafin jiki mai zafi, babu rufi, nan da nan yana kashe tsarin sanyaya. Bisa ga ka'idar austenitic na gargajiya, ƙirƙira dole ne ya sami dogon lokaci. Insulation lokaci a cikin dumama tsari, don haka kamar yadda don kammala nucleation da girma na austenitic hatsi, da rushe sauran cimentite da homogenization na austenitic.The halin yanzu quenching da dumama fasahar forgings da aka samar a karkashin jagorancin wannan ka'idar.Compared da halin yanzu quenching tsari, "sifili zafi adana" quenching ceton lokacin zafi kiyayewa da ake bukata da homogenization na austenitic tsarin, ba kawai zai iya ajiye 20% -30% na makamashi, inganta samar da yadda ya dace 20% -30%, amma kuma iya rage. ko kawar da lahani na hadawan abu da iskar shaka, decarbonization, nakasawa da sauransu, wanda ke taimakawa wajen inganta ingancin samfurin.

Lokacin da carbon karfe da low gami karfe suna mai tsanani zuwa Ac1 ko Ac2, da homogenization tsari na austenite da narkar da carbides a cikin pearlite ne sauri.Lokacin da karfe size nasa ne na bakin ciki sashi kewayon, lissafin dumama lokaci ba ya bukatar la'akari. da thermal rufi, wato, don cimma sifili thermal rufi quenching.Misali, a lokacin da diamita ko kauri na 45 karfe workpiece ne ba fiye da 100mm, dumama a cikin iska tanderu, da yawan zafin jiki na surface da kuma core kusan isa a. lokaci guda, don haka ana iya yin watsi da lokacin uniform ɗinsa, idan aka kwatanta da tsarin samarwa na gargajiya (r=aD) tare da babban adadin dumama, ana iya ragewa da kusan 20% -25% quenching dumama lokacin.

The theoretical analysis da gwaji sakamakon nuna cewa yana yiwuwa a yi amfani da "sifili rufi" a quenching da normalizing dumama na tsarin karfe.Musamman, 45, 45 mn2 carbon tsarin karfe ko guda kashi gami tsarin karfe, da yin amfani da "sifili rufi" tsari iya tabbatar da inji Properties na bukatun; 45, 35CrMo, GCrl5 da sauran tsarin karfe workpiece, da yin amfani da "sifili rufi" dumama fiye da gargajiya dumama iya ajiye dumama lokaci na game da 50%, da jimlar makamashi tanadi na 10% - 15%.

(Daga: 168 forgings net)