Njira Yoponyera Mchenga Wopaka Mchenga

Mchenga wa resin ndi mchenga wowumba (kapena mchenga wapakati) wokonzedwa ndi utomoni ngati chomangira. Kuponyedwa kwa mchenga wopangidwa ndi utomoni kumatchedwansochipolopolo nkhungu kuponyerachifukwa nkhungu yamchenga ya utomoni imatha kukhala yolimba mu chipolopolo cholimba ikatenthetsa kutentha kwachipinda (osaphika kapena kudziumitsa), komwe ndi kosiyana ndiwobiriwira mchenga kuponyera ndondomeko. Kugwiritsiridwa ntchito kwa utomoni wa furan monga chomangira chomangira mchenga ndikusintha kwakukulu pakupanga mchenga. Chiyambireni njira iyi, yakopa chidwi cha makampani opanga mafilimu ndipo yakula mofulumira. Monga utomoni woponyera nkhungu (pachimake) mchenga womangira, mitundu ndi mawonekedwe ake akuchulukirachulukira, omwe amatha kukwaniritsa zofunikira zamitundu yosiyanasiyana yoponyera.

Chifukwa cha kugwiritsa ntchito mchenga wa utomoni, njira zambiri zatsopano zowumbira (pachimake) zawoneka motsatizana, monga pachimake cha chipolopolo (mawonekedwe), bokosi lotentha, bokosi lozizira, phata la mchenga, etc. Pakali pano, kugwiritsa ntchito utomoni mchenga wakhala chimodzi mwa zinthu zofunika kwambiri kupanga misama casts apamwamba. M'magawo opangira mchenga amtundu umodzi komanso kupanga misa, kupanga ma cores a mchenga ndi nkhungu zamchenga zokhala ndi mchenga wa utomoni ndi njira yodziwika bwino, ndipo chitukuko chakhala chofulumira kwambiri m'zaka zaposachedwa.

Ubwino wa Resin Wopaka Mchenga Woponyera:
1. Ma castings ali ndi mawonekedwe abwino komanso olondola kwambiri;
2. Palibe chifukwa chowuma, pali kufupikitsa kuzungulira kwa kupanga;
3. Njira yopangira nkhungu yamchenga wa utomoni imapulumutsa mphamvu chifukwa nkhungu ya mchenga wa utomoni (pachimake) imakhala ndi mphamvu zambiri, mpweya wabwino umadutsa, zolakwika zochepa zoponyera ndi kukana kochepa;
4. Mchenga wa resin uli ndi madzi abwino ndipo ndi wosavuta kuphatikizika;
5. Kuwonongeka kwabwino, kosavuta kugwedezeka ndi kuyeretsa, kuchepetsa kwambiri ntchito.

Kuipa kwa Njira Yoponyera Mchenga wa Resin Sand Mold:
1. Chifukwa kukula kwa mchenga waiwisi, mawonekedwe, sulfure dioxide ndi mankhwala amchere amatha kukhudza kwambiri ntchito ya mchenga wa resin, zofunikira za mchenga waiwisi ndizokwera;
2. Kutentha ndi chinyezi cha malo ogwirira ntchito zimakhudza kwambiri kuthamanga kwachangu ndi kuuma kwa mchenga wa resin;
3. Poyerekeza ndi zomangira organic, mchenga wa utomoni uli ndi mpweya wochulukirapo;
4. Utomoni ndi chothandizira zimakhala ndi fungo lopweteka, ndipo mpweya wabwino mu msonkhano umafunika;
5. Mtengo wa utomoni ndi wapamwamba kuposa kuponya mchenga wobiriwira.

Mchenga wa utomoni womwe umagwiritsidwa ntchito kwambiri ndifuran utomoni wodziumitsa mchenga. Furan resin imakhazikitsidwa ndi mowa wa furfuryl ndipo imatchedwa mphete yapadera ya furan pamapangidwe ake. Kutengera kapangidwe kake, pali utomoni wa furfuryl alcohol furan, urea formaldehyde furan resin, phenolic furan resin ndi formaldehyde furan resin. Utomoni wa Furan nthawi zambiri umagwiritsidwa ntchito ngati chomangira pokonza mchenga woumitsa utomoni popanga. Utoto wa Furan womwe umagwiritsidwa ntchito popanga mchenga wodzikhazika wokha uli ndi mowa wambiri wa furfuryl, kusungidwa bwino kwa utomoni, kulimba kwamafuta ambiri, koma mtengo wokwera.

Mchenga wodziumitsa utomoni wa Furan umatanthawuza mtundu (pachimake) mchenga womwe furan resin binder imakumana ndi zochita za mankhwala mothandizidwa ndi chothandizira ndikukhazikika kutentha. Mchenga wa utomoni wa Furan nthawi zambiri umapangidwa ndi mchenga waiwisi, utomoni wa furan, chothandizira, zowonjezera, ndi zina. Ubwino ndi magwiridwe antchito azinthu zosiyanasiyana zopangira zidzakhudza kwambiri magwiridwe antchito a mchenga wa utomoni komanso mtundu wa ma castings, kotero ndikofunikira kwambiri kusankha moyenera zipangizo zosiyanasiyana za utomoni mchenga.