Ho lahla lehlabathe le ithatafatsang kapa lehlabathe le sa bakeng ke la mofuta o le mong oa lehlabathe le koahetsoeng ka resin kapakhetla hlobo castings tshebetso. E sebelisa lisebelisoa tsa ho kopanya lik'hemik'hale ho kopanya le lehlabathe le ho li lumella hore li be thata ka botsona. Hobane ha ho na ts'ebetso ea pele ho mocheso e hlokahalang, ts'ebetso ena e boetse e bitsoa mokhoa oa ho lahla lehlabathe la no-bake.
Lebitso la no-bake le simolohile ho ho ithatafatsa ha oksijene ea oli e qapiloeng ke Ma-Swiss mathoasong a 1950, ke hore, oli e omeletseng joalo ka oli ea linseed le oli ea tung e kengoa ka li-desiccants tsa tšepe (joalo ka cobalt naphthenate le aluminium naphthenate) le oxidant. (joalo ka potassium permanganate kapa sodium perborate, joalo-joalo). Ho sebelisa mokhoa ona, mokokotlo oa lehlabathe o ka thatafatsoa ho fihlela matla a hlokahalang bakeng sa ho lokolloa ha hlobo ka mor'a ho bolokoa lihora tse 'maloa mocheso oa kamore. E ne e bitsoa ho thatafatsa mocheso oa kamore (Air Set), ho ithatafatsa (Self Set), ho thatafatsa ho batang (Cold Set) joalo-joalo. Empa ha e e-s'o fihle ho ithatafatsa ka sebele, ke hore, ha ho na ho baka (Ha ho Bake), hobane hlobo e phethiloeng (konokono) e hloka ho omisoa lihora tse 'maloa pele e tšela ho finyella ho thatafala ka ho feletseng.
"Lehlabathe le ithatafatsang" ke lentsoe le hlahang ka mor'a hore indasteri ea lihlahisoa e amohele li-binders tsa lik'hemik'hale, 'me moelelo oa eona ke:
1. Ts'ebetsong ea ho kopanya lehlabathe, ntle le ho eketsa binder, moemeli oa ho tiisa (ho thatafatsa) o ka thatafatsang binder o boetse o eketsoa.
2. Ka mor'a ho bōptjoa le ho etsoa ha mantlha ka lehlabathe la mofuta ona, ha ho phekolo (e kang ho omisa kapa ho phunya khase e thata) e sebelisetsoang ho thatafatsa hlobo kapa mokokotlo, 'me hlobo kapa mokokotlo o ka thatafatsa ka boeona.
Ho tloha bofelong ba lilemo tsa bo-1950 ho isa mathoasong a lilemo tsa bo-1960, mokhoa oa 'nete oa ho ithatafatsa ntle le onto o ile oa ntlafatsoa butle-butle, e leng mokhoa oa ho ithatafatsa oa acid-cured (catalyzed) furan resin kapa phenolic resin, le mokhoa oa ho ithatafatsa oa oli ea urethane. 1965. Mokhoa oa ho ithatafatsa oa phenolurethane o ile oa hlahisoa ka 1970, le phenolic ester. mokhoa oa ho ithatafatsa o ile oa hlaha ka 1984. Ka hona, khopolo ea "lehlabathe la ho iketsetsa" le sebetsa ho lehlabathe lohle le entsoeng ka lik'hemik'hale tse thatafalitsoeng, ho akarelletsa lehlabathe la oli le iketsetsang, lehlabathe la khalase ea metsi, lehlabathe la samente, lehlabathe le kopantsoeng ke aluminium phosphate le lehlabathe la resin.
Joalo ka lehlabathe le ithatafatsang la lebokose le batang, lehlabathe la resin la furan ke lehlabathe la pele le le sebelisoang ka ho fetesisa la maiketsetso.Moqapi oa Sechaena. Palo ea resin e kentsoeng lehlabatheng le bōpiloeng hangata ke 0.7% ho isa ho 1.0%, 'me palo ea resin e kentsoeng lehlabatheng la mantlha hangata ke 0.9% ho isa ho 1.1%. Likahare tsa aldehyde ea mahala ho resin ea furan li ka tlase ho 0.3%, 'me lifeme tse ling li theohetse ka tlase ho 0.1%. Libakeng tse thehiloeng Chaena, lehlabathe le ithatafatsang la furan resin le fihlile boemong ba machaba ho sa tsotellehe ts'ebetso ea tlhahiso le boleng ba holim'a li-castings.
Ka mor'a ho kopanya lehlabathe la pele (kapa lehlabathe le tsosolositsoeng), resin ea metsi le motsoako oa metsi ka ho lekana, 'me u li tlatse ka lebokoseng la mantlha (kapa lebokose la lehlabathe), ebe u le tiisa hore le thatafale ka har'a hlobo kapa hlobo ka lebokoseng la mantlha (kapa lebokose la lehlabathe). ) ka mocheso oa kamore, ho ile ha thehoa hlobo ea ho lahla kapa ho lahla, e bitsoang "self-harding cold-core box modeling" (konokono), kapa mokhoa oa ho ithatafatsa (konokono). Mokhoa oa ho ithatafatsa o ka aroloa ka acid-catalyzed furan resin le phenolic resin sand self-harding method, urethane resin sand in self-harding method le phenolic monoester self-harding.
Litšobotsi tsa mantlha tsa ts'ebetso ea ho ithatafatsa ea ho bopa ke:
1) Ntlafatsa ho nepahala ha dimensional tsali-castingsle mahoashe a bokahodimo.
2) Ho thatafala ha hlobo (konokono) lehlabathe ha ho hloke ho omisoa, ho ka bolokang matla, 'me lehong le theko e tlaase kapa mabokose a motheo a polasetiki le li-templates le tsona li ka sebelisoa.
3) Lehlabathe le ithatang le le thata le bonolo ho kopana le ho putlama, ho bonolo ho hloekisa li-castings, 'me lehlabathe la khale le ka sebelisoa hape le ho sebelisoa hape, e leng ho fokotsang matla a mosebetsi oa ho etsa mantlha, ho etsa mohlala, ho oela lehlabathe, ho hloekisa le lihokelo tse ling, le ho bonolo ho elelloa ts'ebetso kapa boiketsetso.
4) Karolo e kholo ea resin lehlabatheng ke 0.8% ~ 2.0% feela, mme litšenyehelo tse felletseng tsa lisebelisoa tse tala li tlase.
Hobane ts'ebetso ea ho ithatafatsa ka boeona e na le melemo e mengata e ikhethang e boletsoeng ka holimo, ho lahla hlobo ea lehlabathe ho ithatafatsa ha e sebelisetsoe feela ho etsa li-core, empa hape e sebelisetsoa ho lahla ho bōpa. E loketse ka ho khetheha bakeng sa sekhechana se le seng le tlhahiso e nyenyane ea batch, 'me e ka hlahisa tšepe e entsoeng ka tšepe, tšepe ea tšepe leli-alloy castings tse se nang ferrous. Mehaho e meng ea Machaena e nkile sebaka ka ho felletseng liforomo tsa lehlabathe le omeletseng la letsopa, liforomo tsa lehlabathe la samente, 'me ka mokhoa o sa fellang li nketse hlobo ea lehlabathe la khalase ea metsi.
Nako ea poso: Jan-21-2021