Umkhiqizo Wokusakaza we-Cast Iron Shell Owenziwe Ngokwezifiso

Izinsimbi ezisansimbi ezithambile zivame ukuphonswaukuphonsa isihlabathi esiluhlazanoma isihlabathi esimbozwe nge-resinukubunjwa kwegobolondoizinqubo ku-RMC casting Foundry.

Ama-cast irons ama-alloys ayoni anekhabhoni engaphezulu kuka-2%. Nakuba izinsimbi ezisansimbi zingaba nephesenti lekhabhoni phakathi kuka-2 kuya ku-6.67, umkhawulo osebenzayo uvamise ukuba phakathi kuka-2 no-4%. Lezi zibalulekile ikakhulukazi ngenxa yezimfanelo zazo ezinhle kakhulu zokulingisa. Izinsimbi ezimpunga ezisansimbi, izinsimbi eziyi-ductile cast (eziphinde zibizwe ngokuthi i-nodular cast iron noma i-spheroidal graphite iron) kanye nensimbi egaywe kalula yizinsimbi ezintathu eziyinhloko ezakhiwe.

I-cast cast iron ethambile inekhabhoni yamahhala ekhona ngesimo samaqhuqhuva ku-matrix ye-cementite ne-ferrite. Lokhu kufezwa ngokupholisa kuqala ukubunjwa ukuze kwakhiwe yonke insimbi ewugqinsi emhlophe, kulandelwe inqubo yokwelapha ukushisa okulawulwayo ukuze enye usimende iguqulwe ibe yi-ferrite namaqhuqhuva ekhabhoni yamahhala. Le nto idonsa kakhulu kune-grey cast iron. Lokhuifomu lifanele kuphela izingxenye ezinobukhulu besigaba esincane kakhulu njengoba yonke insimbi emhlophe iwukuba isiqalo sensimbi ethambileyo.

Ukubunjwa kwesikhunta seShell kuyinqubo lapho isihlabathi esixutshwe ne-thermosetting resin sivunyelwa ukuthi sihlangane nepuleti lephethini yensimbi eshisayo, ukuze kwakheke igobolondo lesikhunta elincanyana neliqinile elizungeze i-pattem. Khona-ke igobolondo liyasuswa ephethini futhi i-cope kanye ne-drag ikhishwa ndawonye futhi igcinwe ku-flask enezinto ezidingekayo zokusekela futhi insimbi encibilikisiwe ithululelwa esikhunjeni.

Ngokuvamile, isihlabathi esomile nesicolekile (90 kuya ku-140 GFN) esingenalo ubumba ngokuphelele sisetshenziselwa ukulungisa isihlabathi sokubumba igobolondo. Ubukhulu bokusanhlamvu okufanele bukhethwe buncike ekuqedeni okungaphezulu okufiswayo ekubunjweni. Usayizi wokusanhlamvu omuhle kakhulu udinga inani elikhulu le-resin, okwenza isikhunta sibize.

Izinzuzo ze-Resin Coated Sand Shell Mold Casting:
1. Ukubunjwa kwesikhunta segobolondo ngokuvamile kunembe kakhulu kunokwakheka kwesihlabathi. Kungenzeka ukuthola ukubekezelelana kwe-+0.25 mm ye-castings yensimbi kanye ne-+0. 35 mm kokusakazwa kwensimbi empunga ngaphansi kwezimo ezijwayelekile zokusebenza. Endabeni yesikhunta segobolondo esibekezeleleka eduze, umuntu angasithola kububanzi obusuka ku-+0.03 ukuya ku-+0.13 mm ngezinhlelo ezithile zokusebenza.
2. Indawo ebushelelezi ingatholakala ekubunjweni kwamagobolondo. Lokhu kutholakala ngokuyinhloko ngosayizi omncane wokusanhlamvu osetshenzisiwe. Ibanga elijwayelekile lobumahhadlahhadla liku-oda lama-microns angu-3 ukuya kwangu-6.
3. Ama-engeli asalungiswa, aphansi kune-castings yesihlabathi, ayadingeka ekubunjweni kwamagobolondo. Ukwehliswa kwama-engeli asalungiswa kungase kube kusuka ku-50 kuya ku-75%, okusindisa kakhulu izindleko zempahla kanye nezindleko zomshini ezilandelayo.
4. Ngezinye izikhathi, ama-cores akhethekile angase akhishwe ekubunjweni kwegobolondo. Njengoba isihlabathi sinamandla amakhulu isikhunta singaklanywa ngendlela yokuthi izimbobo zangaphakathi zingakheka ngokuqondile ngesidingo sezinhlamvu zegobolondo.
5. Futhi, izingxenye ezincane kakhulu (kufika ku-0.25 mm) zohlobo lwamakhanda e-cylinder apholile emoyeni angenziwa kalula ngokubumba igobolondo ngenxa yamandla aphezulu esihlabathi asetshenziselwa ukubumba.
6. Ukungena kwegobolondo kuphezulu ngakho-ke akukho ukufakwa kwegesi okwenzekayo.
7. Isihlabathi esincane kakhulu esidinga ukusetshenziswa.
8. Umshini ungenzeka kalula ngenxa yokucubungula okulula okuhilelekile ekubumbeni igobolondo.