Ukubunjwa kwesihlabathi esiziqinisayo noma ukubunjwa kwesihlabathi esingabhaki kungokohlobo olulodwa lokujikijelwa kwesihlabathi esimbozwe inhlaka nomaigobolondo isikhunta castings inqubo. Isebenzisa izinto zokuhlanganisa amakhemikhali ukuze ixube nesihlabathi futhi izivumele ukuba zibe lukhuni ngokwazo. Ngenxa yokuthi ayikho inqubo yokushisa kwangaphambi kokushisa edingekayo, le nqubo ibizwa nangokuthi inqubo yokubunjwa kwesihlabathi esingabhaki.
Igama elithi no-Bake lisuka ekuziqiniseni uwoyela-oksijini okwasungulwa amaSwitzerland ekuqaleni kuka-1950, okungukuthi, amafutha omile anjengamafutha e-linseed namafutha we-tung engezwa ngama-desiccants ensimbi (njenge-cobalt naphthenate ne-aluminium naphthenate) kanye ne-oxidant. (njenge-potassium permanganate noma i-sodium perborate, njll.). Ngokusebenzisa le nqubo, umgogodla wesihlabathi ungaqiniswa ube namandla adingekayo ukuze kukhishwe isikhunta ngemva kokugcinwa amahora ambalwa ekamelweni lokushisa. Kwakubizwa ngokuthi ukuqina kwezinga lokushisa kwegumbi (I-Air Set), ukuziqinisa (Self Set), ukuqina okubandayo (I-Cold Set) nokunye. Kodwa ayikafinyeleli ekuziqiniseni kwangempela, okungukuthi, akukho kubhaka (Akukho Bhaka), ngoba isikhunta esiqediwe (umgogodla) sidinga ukomiswa amahora amaningana ngaphambi kokuthululwa ukuze kuzuzwe ukuqina okuphelele.
"Isihlabathi esiziqinisayo" yigama elavela ngemuva kokuthi imboni yokusungula yamukele izibophezelo zamakhemikhali, futhi incazelo yalo ithi:
1. Enqubweni yokuxuba isihlabathi, ngaphezu kokwengeza i-binder, i-ejenti yokuqinisa (ukuqina) engakwazi ukuqinisa i-binder nayo yengezwa.
2. Ngemuva kokubumba kanye nokwenza umgogodla ngalolu hlobo lwesihlabathi, akukho kwelashwa (njengokomisa noma ukufutha igesi eqinisayo) okusetshenziselwa ukuqinisa isikhunta noma umgogodla, futhi isikhunta noma umgogodla ungaqina ngokwawo.
Kusukela ngasekupheleni kwawo-1950 kuya ekuqaleni kwawo-1960, indlela yangempela yokuziqinisa ngaphandle kukahhavini yathuthukiswa kancane kancane, okuyi-acid-cured (catalyzed) furan resin noma indlela yokuzenza lukhuni ye-phenolic resin, kanye nendlela yokuziqinisa kawoyela urethane. 1965. Indlela yokuziqinisa i-phenolurethane yethulwa ngo-1970, kanye ne-phenolic ester. indlela yokuziqinisa yavela ngo-1984. Ngakho-ke, umqondo wokuthi "isihlabathi sokuzibekela" sisebenza kuzo zonke izihlabathi zokubumba eziqiniswe ngamakhemikhali, kufaka phakathi isihlabathi samafutha esizibekela sona, isihlabathi sengilazi yamanzi, isihlabathi sikasimende, isihlabathi esiboshwe nge-aluminium phosphate kanye nesihlabathi se-resin.
Njengesihlabathi esibopha ibhokisi elibandayo eliziqinisayo, isihlabathi se-furan resin sisekuqaleni futhi esisetshenziswa kakhulu njengamanjeUmsunguli wamaShayina. Inani le-resin elengezwe esihlabathini esibumbayo ngokuvamile lingu-0.7% kuya ku-1.0%, kanti inani le-resin eyengeziwe esihlabathini esiwumgogodla ngokuvamile lingu-0.9% kuya ku-1.1%. Okuqukethwe kwe-aldehyde yamahhala ku-furan resin kungaphansi kuka-0.3%, kanti ezinye izimboni zehle zaba ngaphansi kuka-0.1%. Ezindaweni ezisungulwe e-China, isihlabathi esiziqinisayo se-furan resin sesifinyelele ezingeni lamazwe ngamazwe ngaphandle kwenqubo yokukhiqiza kanye nekhwalithi engaphezulu ye-castings.
Ngemuva kokuxuba isihlabathi sokuqala (noma isihlabathi esibuyisiwe), i-resin ewuketshezi kanye ne-catalyst ye-liquid ngokulinganayo, bese uyigcwalisa ebhokisini le-core (noma ibhokisi lesihlabathi), bese uyiqinisa ukuze iqine ibe isikhunta noma isikhunta ebhokisini elingumgogodla (noma ibhokisi lesihlabathi. ) ekamelweni lokushisa, isikhunta sokuphonsa noma i-casting core yakhiwa, okubizwa ngokuthi i-self-hardening cold-core box modeling (core), noma indlela yokuziqinisa (core). Indlela yokuziqinisa ingahlukaniswa nge-acid-catalyzed furan resin kanye ne-phenolic resin sand self-harding method, i-urethane resin sand self-harding method kanye ne-phenolic monoester self-harding method.
Izici eziyisisekelo zenqubo yokubunjwa yokuziqinisa yizi:
1) Thuthukisa ukunemba kwe-dimensional yeukusakazakanye nobukhulu obungaphezulu.
2) Ukuqina kwesihlabathi sesikhunta (core) akudingi ukomiswa, okungasindisa amandla, futhi amabhokisi ayisisekelo ezinkuni noma epulasitiki kanye nezifanekiso nawo angasetshenziswa.
I-3) Isihlabathi sokuzibumba esiziqinisayo kulula ukusihlanganisa futhi sigoqe, kulula ukusihlanza, futhi isihlabathi esidala singagaywa kabusha futhi sisetshenziswe kabusha, okunciphisa kakhulu ukuqina komsebenzi wokwenza ingqikithi, ukumodela, ukuwa kwesihlabathi, ukuhlanza nezinye izixhumanisi, kanye kulula ukubona imishini noma i-automation.
4) Ingxenye enkulu ye-resin esihlabathini ingu-0.8% ~ 2.0% kuphela, futhi izindleko eziphelele zezinto zokusetshenziswa ziphansi.
Ngenxa yokuthi inqubo yokuzikhandla yokuziqinisa inezinzuzo eziningi eziyingqayizivele ezibalwe ngenhla, ukubunjwa kwesikhunta sesihlabathi esiziqinisayo akusetshenziselwa ukwenza ingqikithi, kodwa futhi kusetshenziselwa ukubunjwa kokubunjwa. Ifaneleka ngokukhethekile ucezu olulodwa kanye nokukhiqizwa kwe-batch encane, futhi ingakhiqiza insimbi ekhonjiwe, insimbi yensimbi kanyeama-alloy castings angenayo i-ferrous. Ezinye izikhungo zaseShayina ziye zashintsha ngokuphelele isikhunta sesihlabathi esomile sobumba, isikhunta sesihlabathi sikasimende, futhi sashintsha ingxenye yesikhunta sesihlabathi sengilazi yamanzi.
Isikhathi sokuthumela: Jan-21-2021