Mitundu Itatu Yakuponya Mchenga

Malingana ndi kusiyana kwa mchenga umene umagwiritsidwa ntchito popanga matabwa, njira yopangira mchenga ikhoza kugawidwa m'mitundu yosiyanasiyana, mongakuponya mchenga wobiriwira, kuponyera mchenga (kuponya zipolopolo), kuponyera mchenga wowumitsa wokha komanso kuponya mchenga wouma (kutaya thovu ndi kuponya vacuum). Nkhaniyi tikuwonetsa njira zitatu zotsatirazi zoponya mchenga:

 

Green Sand Casting

Mchenga wobiriwira kwenikweni ndi wosakaniza wonyowa wa mchenga ndi dongo, palibe mankhwala omwe amawonjezeredwa. Chikombole chamchengacho chimafinyidwa pamodzi ndikusunga mawonekedwe ake. Kusankhidwa kwa mchenga kumakhudzana kwambiri ndi kutentha komwe zitsulo zimatsanuliridwa. Pakutentha kumene mkuwa ndi chitsulo zimatsanuliridwa, dongo limakhala lopanda mphamvu chifukwa cha kutentha, lomwe ndi dongo losakula. Chifukwa chake, omwe amathira chitsulo nthawi zambiri amagwira ntchito ndi mchenga wa silica womwe ndi wotchipa poyerekeza ndi mchenga wina.

 

Kuponyedwa kwa Mchenga Wopangidwa ndi Resin

Zomangira utomoni ndi zachilengedwe kapena kupanga high sungunuka mkamwa. Palinso utomoni wozizira, womwe umagwiritsa ntchito chothandizira m'malo mwa kutentha kuchiritsa chomangiracho. Zomangira utomoni ndizodziwika kwambiri chifukwa zimatha kupezeka ndi zinthu zosiyanasiyana posakanikirana ndi zowonjezera zosiyanasiyana. Ubwino wina ndi monga kugwa kwabwino, kutsika pang'ono kwa gassing, ndipo amasiya kutha kwapamwamba pakuponya. Njira yopangira nkhungu ya Shell imapereka kutsirizika kwabwinoko, kulolerana bwinoko, komanso kutulutsa kwakukulu chifukwa cha kuchepa kwa nthawi yozungulira. Zida zomwe zingagwiritsidwe ntchito ndi njirayi ndizitsulo zotayidwa, ndi aluminiyamu ndi mkuwa. TheNjira yoponyera zipolopoloimapanga njira zochepetsera mtengo pamawonekedwe ovuta, zotengera zopondereza, zigawo zomwe zimakhudzidwa ndi kulemera, ndi zoponya zomwe zimafunikira kumaliza kwapamwamba kwambiri.

 

Kuponya Mchenga Wodziumitsa

"Mchenga wodziumitsa" ndi mawu omwe adawonekera pambuyo poti makampani opanga zida adatengera zomangira mankhwala. Mumchenga kusakaniza ndondomeko, kuwonjezera pa kuwonjezera binder, kulimbitsa (kuuma) wothandizira amene angathe kuumitsa binder amawonjezeredwa. Pambuyo popanga ndi kupanga pakati ndi mchenga wotere, palibe chithandizo (monga kuyanika kapena kuwomba mpweya wowumitsa) chomwe chimagwiritsidwa ntchito kuumitsa nkhungu kapena pachimake, ndipo nkhungu kapena pachimake zimatha kuuma zokha.

Chifukwa nkhungu imapangidwa pa kutentha kwa chipinda ndipo palibe chifukwa chotenthetsa, kudzipangira mchenga wouma kumatchedwanso kuti palibe-bake casting process. Njira yodziumitsa yokha imatha kugawidwa mu acid-catalyzed furan resin ndi phenolic resin mchenga kudziletsa njira, urethane resin mchenga kudziletsa kuumitsa njira ndi phenolic monoester kudziletsa kuumitsa njira.

Furan resin kudziumitsa mchenga kuponya (njira ya nobake) amagwiritsa ntchito furan resin yokutidwa mchenga kupanga nkhungu kuponyera. Pambuyo kusakaniza mchenga wapachiyambi (kapena mchenga wobwezeretsedwa), utomoni wamadzimadzi wa furan ndi chothandizira chamadzimadzi mofanana, ndikuwadzaza mu bokosi lapakati (kapena mchenga), ndiyeno mumangirire kuti likhale lolimba mu nkhungu kapena nkhungu mu bokosi lapakati (kapena mchenga). box) pa kutentha. Ndiye kuponya nkhungu kapena kuponyera pachimake anapangidwa, amene amatchedwa kudziletsa kuumitsa ozizira pachimake bokosi akamaumba (pachimake), kapena kudziletsa kuumitsa njira (pachimake).