Iindidi eziNtathu zeNkqubo yokuGcisa isanti

Ngokomahluko wesanti esetyenziselwa ukwenza iimbumba zokubumba, inkqubo yokuphosa isanti inokohlulwa ibe ziindidi ezininzi ezahlukeneyo, njenge.ukugalela isanti eluhlaza, ukugatywa kwesanti egqunyiweyo (ukuphosa iqokobhe), ukuziqinisa kwesanti kunye nokuphosa isanti eyomileyo (ukuphosa ugwebu olulahlekileyo kunye nokuphosa ivacuum). Eli nqaku siza kwazisa ikakhulu ezi nkqubo zintathu zilandelayo zokugalela isanti:

 

Ukuphosa kweSanti eluhlaza

Isanti eluhlaza ngumxube omanzi wesanti kunye nodongwe, akukho khemikhali yongezwayo. Umngundo wesanti uyacudiswa kunye kwaye ubambe ukumila kwawo. Ukukhethwa kwesanti kuninzi malunga neqondo lokushisa apho isinyithi sigalelwa khona. Kumaqondo obushushu agalelwa ubhedu nentsimbi, udongwe alunamsebenzi ngenxa yobushushu, nto leyo eludongwe olungandi. Ke endaweni yoko, ezo zigalela intsimbi zisebenza ngesanti yesilica engabizi kakhulu xa kuthelekiswa nezinye iisanti.

 

I-Resin-coated Sand Shell Casting

Izibophelelo zeresin zezendalo okanye zokwenziwa kwindawo ephezulu yokunyibilika kweentsini. Kukwakho neereyini ezifakwe emakhazeni, ezisebenzisa i-catalyst endaweni yobushushu ukunyanga isibophelelo. Izibophelelo ze-resin zithandwa kakhulu kuba iipropathi ezahlukeneyo zinokufumaneka ngokuxuba kunye nezongezo ezahlukeneyo. Ezinye izibonelelo zibandakanya ukubola okuhle, i-gassing ephantsi, kwaye zishiya umphezulu ogqityiweyo kwindawo yokuphosa. Inkqubo yokubunjwa kweShell ibonelela ngokugqitywa komphezulu ongcono, ukunyamezelwa komgangatho ongcono, kunye nokuphuma okuphezulu ngenxa yokuncitshiswa kwamaxesha okujikeleza. Izinto ezinokuthi zisetyenziswe ngale nkqubo ziyintsimbi etyhidiweyo, kunye ne-aluminium kunye ne-alloys zethusi. Iinkqubo yokuphosa iqokobheivelisa izisombululo zokonga iindleko zeemilo ezinzima, iinqanawa zoxinzelelo, iindawo ezinobunzima bobunzima, kunye nokusaswa okudinga ukugqitywa okuphezulu komphezulu.

 

Ukuziqinisa kweSanti

"Isanti ezenza lukhuni" ligama eliye lavela emva kokuba i-Foundry industry yamkele izibophelelo zeekhemikhali. Kwinkqubo yokuxuba isanti, ngaphezu kokongeza i-binder, i-ejenti yokuqinisa (i-agent) engakwazi ukuqinisa i-binder nayo yongezwa. Emva kokubumba kunye nokwenziwa kwengundoqo ngolu hlobo lwesanti, akukho nyango (njengokomisa okanye ukuvuthela igesi yokuqina) isetyenziselwa ukuqinisa i-mold okanye i-core, kwaye i-mold okanye i-core inokuqina ngokwayo.

Ngenxa yokuba umngundo wenziwe kwiqondo lobushushu begumbi kwaye akukho mfuneko yokufudumeza, ukuziqinisa kwesanti kukwabizwa ngokuba yinkqubo yokuphosa yokubhaka. Indlela yokuziqinisa inokwahlulwa ibe yi-acid-catalyzed furan resin kunye ne-phenolic resin sand self-harding method, i-urethane resin sand self-harding method kunye ne-phenolic monoester self-harding method.

I-Furan resin self-ukuqina kwesanti inkqubo yokugalela (inkqubo ye-nobake) isebenzisa i-furan resin egqunywe isanti ukwenza i-mold yokuphosa. Emva kokuxuba isanti yoqobo (okanye isanti ebuyisiweyo), intlaka ye-furan elulwelo kunye ne-catalyst engamanzi ngokulinganayo, kwaye uyigcwalise kwibhokisi engundoqo (okanye kwibhokisi yesanti), kwaye emva koko uyiqinise ukuze iqine ibe ngumbumba okanye i-mold kwibhokisi engundoqo (okanye isanti. ibhokisi) kwiqondo lokushisa. Emva koko i-mold casting okanye i-casting core yaqulunqwa, ebizwa ngokuba yi-self-hardening ebandayo-ibhokisi yokubumba (i-core), okanye indlela yokuziqinisa (core).