Nthawichipolopolo nkhungu kuponyera, asanayambe kupanga nkhungu ndi pachimake, mchenga wokutira waphimbidwa ndi filimu yolimba ya resin pamwamba pa mchenga wa mchenga. Mchenga wokutidwa umatchedwanso chipolopolo (pachimake) mchenga. Ndi kumakaniko kusakaniza ufa wa thermosetting phenolic mtengo ndi mchenga waiwisi ndi kulimba kuti ukhale wolimba ndi wamphamvu ukatenthedwa. Apangidwa kukhala mchenga wokutidwa pogwiritsa ntchito thermoplastic phenolic resin plus latent curing agent (monga urotropine) ndi lubricant (monga calcium stearate) kudzera munjira zina zokutira. Mchenga wokutidwa ukatenthedwa, utomoni womwe umakutidwa pamwamba pa mchengawo umasungunuka. Utoto wosungunulawu umasintha mofulumira kuchoka ku mzere wa mzere kupita ku thupi losasunthika kotero kuti mchenga wophimbidwa umakhala wolimba ndi kupangidwa. Kuphatikiza pa mchenga wowuma wouma, palinso mchenga wonyowa komanso wokutidwa ndi viscous.
mchenga wokutidwa ndi utomonizipolopolo kuponyera zigawoali ndi izi:
1) Ili ndi magwiridwe antchito oyenera. Ikhoza kukwaniritsa zofunikira pa mchenga wa chipolopolo champhamvu kwambiri, mchenga wa bokosi lamphamvu lapakati, ndi mchenga wa alloy wopanda mphamvu zochepa.
2) Kusungunuka kwabwino kwambiri, kuumbika bwino kwa pachimake cha mchenga ndi ndondomeko yomveka bwino, yomwe imatha kupanga mchenga wovuta kwambiri, monga mchenga wa jekete lamadzi monga mitu ya silinda ndi matupi a makina.
3) Ubwino wapakatikati pa mchenga ndi wabwino, wophatikizika komanso wosamasuka. Ngakhale zokutira zocheperako kapena zosagwiritsidwa ntchito, zopanga zapamwamba zitha kupezeka. The dimensional kulondola kwa castings akhoza kufika CT7-CT8, ndi pamwamba roughness Ra akhoza kufika 6.3-12.5μm.
4) Kuwonongeka kwabwino, komwe kumathandizira kuyeretsa ndikuwongolera magwiridwe antchito
5) Mchenga wapakati siwosavuta kuyamwa chinyezi, ndipo mphamvu yosungiramo nthawi yayitali sivuta kuchepa, yomwe imathandizira kusungirako, kuyendetsa ndi kugwiritsa ntchito.
Njira zopangira nkhungu zamchenga (pachimake) popanga zipolopolo:
1. Njira yayikulu yopangira nkhungu yamchenga (pachimake) ndi: kutembenuza kapena kupukusa mchenga → kutumphuka → kutulutsa mchenga → kuumitsa → pachimake ( nkhungu) ndi zina zotero.
1) Pindulani kapena phulitsa mchenga. Ndiko kuti, mchenga wokutidwa umatsanuliridwa pa nkhungu ya chipolopolo kapena kuwombedwa mu bokosi lapakati kuti apange chipolopolo kapena chipolopolo pakati.
2) Kukhazikika. Kuchuluka kwa chipolopolo cha chipolopolo kumayendetsedwa ndi kusintha kutentha kwa kutentha ndi nthawi yogwira.
3) Kutuluka kwa mchenga. Pendekerani nkhungu ndi bokosi lapakati kuti mchenga wosakanizidwa ugwe kuchokera pachigoba chotenthedwa, ndipo sonkhanitsani kuti muugwiritsenso ntchito. Kuti zikhale zosavuta kuchotsa mchenga wosasungunuka wosasungunuka, ngati kuli kofunikira, njira yamakina yogwedeza mmbuyo ndi mtsogolo ingatengedwe.
4) Kuwumitsa. M'malo otentha, kuti makulidwe a chipolopolocho akhale ofanana, agwirizane ndi pamwamba pa chipolopolo chamoto mkati mwa nthawi yowonjezereka.
5) Tengani pachimake. Chotsani mawonekedwe a chipolopolo cholimba ndi chipolopolo chapakati pa nkhungu ndi bokosi lapakati.
