Quench Cool Casting Na Tagulla Propellers

Saboda ƙarancin ƙarancin zafin jiki na yashi mai gyare-gyare, ana iya sanyaya manyan na'urori masu nauyin dubun ton na kwanaki da yawa. Yawan sanyaya na machining simintin gyare-gyare yana jinkirin, kuma kayan aikin injiniya da ƙarfin gajiyar lalata da ke haifar da tasirin ingancin suna raguwa sosai. 

The inji Properties da lalata gajiya ƙarfi na musamman ingancin effects an rage muhimmanci. Musamman a kusa da 0.2 ~ 0.3R na airfoil tare da mafi girman aiki danniya, da kauri daga cikin airfoil (sai dai cibiya) ne thicker fiye da sauran sassa, don haka lalata gajiya ƙarfi maimaita 2x107, 18kgf / mm2, da diamita na fiye da. 6000mm yayi nauyi ton ashirin. Don babba-sikelin murfin jirgin ruwa simintin gyare-gyare, ƙarfin gajiyar lalata a tushen reshe ya faɗi zuwa 2x107; 10 ~ 20 kgf / mm2. Dalili kuwa shine gudun simintin gyare-gyare yana tsakanin kusan 1000 ° C da 700 ° C. Don manyan masu tallatawa, yawan sanyaya yana kusan 0.1 ° C / min. 

Sabili da haka, mahadi na ƙarfe na Al, Ni, da Fe (kamar FeAl, NiAl, da dai sauransu) waɗanda ke mamaye kaddarorin kayan aikin nickel-aluminum bronze gami da haɓaka haɓaka Bugu da ƙari, simintin tagulla na nickel-aluminum suna kula da ɗaukar hydrogen yayin sha. tsarin narkewa, da jinkirin sanyaya manyan simintin gyare-gyare na iya haifar da lahani na hydrogen.

Saboda haka, sabuwar hanyar yin simintin gyare-gyare tana da:

• 1. Game da nauyin kashi na sinadaran abun da ke ciki a cikin kayan: aluminum 8.5 ~ 10.5%, nickel 4 ~ 6%, iron 4 ~ 6%, manganese 4% or less, jan karfe da najasa na kowa.
• 2. A lokacin simintin gyare-gyare, bayan jefar da narkakkar da tagulla gami a cikin wani mold wanda zai iya sarrafa yawan sanyaya, da sanyaya kudi ana sarrafa tsakanin 1000 ~ 700 ℃, 5 ℃ / min; kasa da 700 ℃, 1 ℃ / min.

Wannan hanyar simintin gyare-gyare ta bambanta da ƙirar yashi da sanyin iska tare da ƙarancin zafin jiki a baya. Madadin haka, yana amfani da barbashi na ƙarfe tare da zafin zafin jiki sau 20 zuwa 30 sama da na yashi, kuma yana shigar da ruwa mai sanyaya. Bugu da ƙari, kafin a zuba, hanyar da za a kwantar da narkakkar narkakkar tagulla da ƙarfi da ƙarfi tare da ƙayyadaddun sinadarai yayin da ake zubar da ruwa mai sanyaya a cikin kwandon kuma ana yin sanyaya tilas. 

Adadin sanyaya yana da girma fiye da na hanyar simintin gyare-gyare na al'ada, wanda ke hana tabarbarewar ƙarfin gajiyar lallacewa da kaddarorin injina waɗanda ke haifar da ingantaccen sakamako.

Wannan hanyar simintin gyare-gyaren ta nuna cewa yanayin sanyaya tsakanin 1000 da 700 ° C shine 5 ° C / min ko fiye, saboda yanayin sanyaya ba shi da dangantaka da hazo da girma na hazo sama da 1000 ° C, da kuma hazo (FeAl, NiAl). tsakanin 1000 da 700 ° C) da dai sauransu) 

Hazo da zafin girma; ƙasa da 700 ° C, hatsin lu'ulu'u kusan ba sa girma, kuma yuwuwar yanayin sanyi yana hazo a ƙarƙashin wannan yanayin zafin jiki dole ne ya sami ƙimar iyaka don girma zuwa girman da ya dace. Ba a ƙayyade iyakar ƙimar sanyaya ba saboda siffar simintin ya bambanta, kuma yana da kyau cewa 5 ° C / min ko fiye ya isa don sarrafa haɓakar hazo. Adadin sanyaya ƙasa 700 ° C an ƙayyade ya kasance ƙasa da 1 ° C / min, don canza yanayin β wanda aka samar ta hanyar saurin sanyaya sama da 1000 ° C zuwa 5 ° C / min tsakanin 1000 ° C da 700 ° C zuwa α. lokaci, don tabbatar da taurin kayan, da kuma ba da damar abubuwan haɗakarwa don yaduwa sosai don cimma daidaiton kayan cikin. 

Babu ƙananan iyaka don ƙimar sanyaya ƙasa 700 ° C. A zahiri, ƙimar sanyaya ya bambanta da siffar simintin gyare-gyare. Idan ƙimar sanyaya ƙasa 1 ° C / min, canjin α-lokaci na iya zama mafi isa kuma ana iya samun ƙarfin gajiya mai ƙarfi. Tare da wannan hanyar simintin gyare-gyare, simintin baya buƙatar sake jin zafin zafi a babban zafin jiki, yana guje wa matsalolin oxidation da nakasar da maganin zafi ke haifarwa, kuma yana adana kuzari.

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