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Monga kampani yopanga nkhungu ku China, poyerekeza ndi nkhungu yakunyumba, mitengo yotumizira nkhungu kunja ndi yokwera kwambiri m'zaka zapitazi, kusiyana kumeneku kumachitika chifukwa cha muyezo wa diffriend. Bungwe la American Society of Plastic Industry (SPIAN-102-78) limagawa nkhungu m'magulu asanu. Mitundu isanu iyi ya nkhungu ili ndi zofunikira zosiyanasiyana, ndipo muyezo wogawa umagwiritsidwa ntchito kokha kuti ugwirizane ndi makina opangira jakisoni omwe mphamvu yake ndi yochepera matani 400.

Moyo wonse umatha nthawi mpaka 1 miliyoni, yapadera chifukwa cha mphamvu yayikulu yopangira chinthucho. Kusankha chitsulo chabwino kwambiri chopangira nkhungu, chomwe chikugwirizana ndi nkhungu iyi, kumafuna mtengo wapamwamba kwambiri. Zofunikira zikuwonetsedwa motere:

(1) Muyenera kukhala ndi chidziwitso chatsatanetsatane cha kapangidwe ka nkhungu.
(2) Zofunikira pa kuuma kwa maziko a nkhungu osachepera BHN280 (HRC30).
(3) Pamwamba pa nkhungu (kuphatikizapo zibowo ndi zibowo zapakati) osachepera mu mtundu wa BHN450 (48HRC), zowonjezera zina zonse monga zotsetsereka, zonyamulira, zonyamulira zolunjika, ndi zina zotero ziyenera kukhala zolimba.
(4) Dongosolo lotulutsa mpweya liyenera kukhala ndi dongosolo lotsogolera.
(5) Chotsekera cham'mbali chiyenera kukhala ndi mbale yoti chizigwiritsidwa ntchito.
(6) Chophimba cha m'mimba, chophimba chapakati, chotsetsereka ndi zina mu chophimbacho ziyenera kuyikidwa ndi chowunikira kutentha.
(7) Ponena za moyo wa nkhungu, khalidwe la chinthucho lidzachepa kapena nthawi yozungulira ya utomoni idzakulitsidwa chifukwa chitoliro cha madzi ozizira chinayamba kuzizira tsiku ndi tsiku, kotero zoyikapo kapena mbale za nkhungu zinalangizidwa kuti zichite mankhwala oletsa dzimbiri.
(8) Zipatso zonse za mtundu uwu ziyenera kukhala ndi njira yolumikizira chipatsocho pamzere wopatulira.

GALADI 2

Moyo wonse umatha nthawi 500,000 mpaka 1,000,000. Kuti apange zinthu zazikulu, chitsulo chabwino kwambiri chidzagwiritsidwa ntchito popanga zinthu zodula kwambiri. Zofunikira zake ndi izi:

(1) ayenera kukhala ndi chidziwitso chatsatanetsatane cha kapangidwe ka nkhungu.
(2) Zofunikira pa kuuma kwa maziko a nkhungu osachepera BHN280 (HRC30).
(3) Kulimba kwa m'mimba ndi pakati pa nthaka kuyenera kukhala pakati pa BHN540 (HRC 48), zinthu zina zonse zogwirira ntchito ziyenera kutenthedwa.
(4) Ikani chowunikira kutentha pa nkhungu ya m'mimba, nkhungu yapakati, zotsetsereka ndi malo ena omwe angatheke.
(5) Zipatso zonse zamtunduwu ziyenera kukhala ndi njira yolumikizirana pakati pa mzere wolekanitsira.
(6) Zinthu zomwe zili pansipa zikufunika kapena ayi, kutengera kuchuluka komaliza kopanga. Tikulangiza kuti zinthuzi ziperekenso mtengo wotsimikizika.
Dongosolo lotsogolera la Ejector, Slider wear plate, anti-ekulsion Colling manifold, Electroplating pa cavity mold (anti-crosion).

GALADI 3

Nthawi ya njinga mpaka nthawi 500,000. Mtengo wake ndi wokwanira chifukwa umagwiritsidwa ntchito ngati chinthu chapakati chopangira zinthu. Zofunikira zake ndi izi:

(1) ayenera kukhala ndi chidziwitso chatsatanetsatane cha kapangidwe ka nkhungu.
(2) Zofunikira pa kuuma kwa maziko a nkhungu osachepera BHN165 (HRC17).
(3) ziboliboli za m'mimba ndi zapakati ziyenera kukhala ndi kuuma kwa BHN280 (HRC30) kapena kuposerapo.
(4) zowonjezera zina zonse ndi zaulere kusankha ndi ogulitsa.

GALADI 4

Moyo wonse umatha nthawi 100,000. Pazinthu zochepa zopangira, kukana kwa nkhungu sikukwera, mtengo wake ndi wotsika kuposa momwe zimakhalira. Zofunikira ndi izi:

(1) Perekani lingaliro loti mupereke zambiri zokhudza kapangidwe ka nkhungu.
(2) Maziko a nkhungu akhoza kukhala chitsulo chofewa kapena chitsulo choluminiyamu.
(3) Chiboliboli cha m'mimba mwake chingakhale chitsulo cha aluminiyamu, chitsulo chofewa kapena zinthu zina zomwe zingadziwike.
(4) Zothandizira zonse ndi zaulere kusankha ndi ogulitsa.

GALADI 5

Nthawi ya kuzungulira siipitirira nthawi 500. Pogwiritsidwa ntchito popanga chiwerengero chochepa cha chitsanzo choyamba, mtengo wake ndi wotsika mtengo kwambiri. Zofunikira zake ndi izi:

Kapangidwe ka nkhungu kangakhale chinthu chopangidwa ndi ufa, utomoni wa epoxy, kapena chinthu china chomwe chimapereka mphamvu zokwanira kuti chipange zigawo zochepa kwambiri.