Kukula kugawa kwaiwisi mchenga particles kumakhudza kwambiri khalidwe la castings. Mukamagwiritsa ntchito grit, chitsulo chosungunula chimakonda kulowa mkati mwa grit, zomwe zimapangitsa kuti pakhale kusasunthika bwino. Kugwiritsiridwa ntchito kwa mchenga wonyezimira kumatha kutulutsa malo abwinoko komanso osalala, koma kumafuna kuchuluka kwa binder, ndipo panthawi imodzimodziyo kumachepetsa mpweya wapakati, zomwe zingayambitse kuponyera zolakwika. Nthawi zambiri kuponya mchenga, makamaka mchenga wa silica ukagwiritsidwa ntchito, mchenga waiwisi nthawi zambiri umakhala mosiyanasiyana motere:
Avereji ya fineness 50-60 AFS (avareji ya tinthu ting'onoting'ono 220–250 μm): ubwino wa pamwamba ndi kutsika kwa ntchito zomangira
Fine ufa (zosakwana 200 mauna) zili ≤2%: zitha kuchepetsa kuchuluka kwa binder
Matope (tinthu tating'ono zosakwana 0.02mm) ≤0.5%: akhoza kuchepetsa kuchuluka kwa binder
Kugawa kwa tinthu tating'onoting'ono: 95% ya mchenga imakhazikika pa sieve ya 4 kapena 5: yosavuta kuphatikizika ndikuchepetsa kuwonongeka kwa kutupa.
Kuthekera kwa mpweya wamchenga wouma: 100-150: chepetsa kuwonongeka kwa pore
Ceramic mchenga, chifukwa pafupifupi kuzungulira tinthu mawonekedwe, fluidity kwambiri, mkulu mpweya permeability, ndi makhalidwe a lonse tinthu kukula kugawa ndi limodzi mauna kuphatikiza kusanganikirana popanga ndondomeko, mu kuponyera mchitidwe, kuwonjezera pa kutsatira makhalidwe pamwamba wamba, pali Makhalidwe Ake apadera a gradation omwe amachititsa kuti akhale opanda tsankho komanso delamination panthawi ya mayendedwe ndi mayendedwe; ili ndi mphamvu yabwino yonyowa pogwiritsira ntchito mchenga wobiriwira wa nkhungu komanso mchenga wosaphika. Pakuti mchenga kuponyera ndondomeko ntchito binders, ntchito Mipikisano sieve kugawa kumapangitsa tinthu ting'onoting'ono kudzaza mipata pakati pa particles zazikulu ndi inlay wina ndi mzake, kuwonjezera "kulumikiza mlatho" wa binder, potero kuwongolera chomangira mphamvu pachimake, etc. Ndi njira yothandiza.
Mwachidule ntchito mchenga ceramic kwa zaka zoposa 20, tinthu kukula zofunika ndi kugawa mchenga ceramic ntchito njira zosiyanasiyana kuponyera ali pafupifupi kutchulidwa motere:
● RCS (Resin Coated Ceramic Sand)
Makhalidwe a AFS a 50-70, 70-90, ndi 90-110 onse amagwiritsidwa ntchito, amagawidwa mu 4 kapena 5 sieves, ndipo ndende ili pamwamba pa 85%;
● Mchenga wa utomoni wosaphika
(Kuphatikiza furan, alkali phenolic, PEP, Bonnie, etc.): AFS 30-65 amagwiritsidwa ntchito, 4 sieves kapena 5 sieves kugawa, ndende ndi pa 80%;
● Lost Foam Process/Lost Weight Foundry Process
10/20 mauna ndi 20/30 mauna amagwiritsidwa ntchito kwambiri, amene angathe kusintha mpweya permeability, kuonetsetsa mlingo zobwezeretsanso mchenga ceramic pambuyo kuthira, ndi kuchepetsa kumwa;
● Njira ya Mchenga wa Cold Box
AFS 40-60 imagwiritsidwa ntchito kwambiri, imagawidwa ndi 4 kapena 5 sieves, ndipo ndende ili pamwamba pa 85%;
● Kusindikiza Mchenga wa 3D
2 sieves amagawidwa, mpaka 3 sieves, ndi ndende ya 90%, kuonetsetsa yunifolomu wosanjikiza mchenga makulidwe. Wapakati fineness amafalitsidwa kwambiri malinga ndi ntchito zosiyanasiyana
Nthawi yotumiza: Mar-27-2023
