Mitundu iwiri imagwiritsidwa ntchito popanga ufa;imodzi imatchedwa "cover die half" ndipo ina "ejector die theka".Kumene amakumana amatchedwa mzere wolekanitsa.Chivundikiro chakufa chimakhala ndi sprue (makina otentha) kapena dzenje (makina achipinda chozizira), omwe amalola kuti zitsulo zosungunuka zilowerere mukufa;izi zimagwirizana ndi jekeseni wa jekeseni pamakina achipinda chotentha kapena chipinda chowombera m'makina achipinda chozizira.Kufa kwa ejector kumakhala ndi zikhomo za ejector ndipo nthawi zambiri wothamanga, yomwe ndi njira yochokera ku sprue kapena kuwombera dzenje kupita ku nkhungu.Chivundikirocho chimayikidwa pazitsulo zoyima, kapena kutsogolo, mbale ya makina oponyera, pamene kufa kwa ejector kumangiriridwa ku platen yosuntha.Mphuno ya nkhungu imadulidwa m'zipinda ziwiri, zomwe zimakhala zidutswa zosiyana zomwe zingathe kusinthidwa mosavuta ndikumangirira m'mahalofu.

Mafawa amapangidwa kuti kuponyedwa komalizidwa kuchoke pachivundikiro cha theka la kufa ndikukhala mu theka la ejector pomwe mafa amatsegulidwa.Izi zimatsimikizira kuti kuponyedwa kudzatulutsidwa mkombero uliwonse chifukwa theka la ejector lili ndi zikhomo za ejector kukankhira kutulutsa kwa theka lakufalo.Zikhomo za ejector zimayendetsedwa ndi mbale ya ejector pin, yomwe imayendetsa molondola zikhomo zonse panthawi imodzi ndi mphamvu yomweyo, kuti kuponyerako kusawonongeke.Pini ya ejector imabwezeretsanso mapiniwo pambuyo potulutsa kuponya kuti ikonzekere kuwombera kotsatira.Payenera kukhala ma ejector pins okwanira kuti mphamvu yonse ya pini iliyonse ikhale yotsika, chifukwa kuponyera kukadali kotentha ndipo kumatha kuonongeka ndi mphamvu yochulukirapo.Mapiniwo amasiyabe chizindikiro, choncho ayenera kukhala pamalo pomwe zizindikirozo sizidzasokoneza cholinga cha kuponyera.

Zigawo zina zakufa zimaphatikizapo ma cores ndi slide.Cores ndi zigawo zomwe nthawi zambiri zimatulutsa mabowo kapena kutseguka, koma zimatha kugwiritsidwa ntchito kupanga zinanso.Pali mitundu itatu ya ma cores: okhazikika, osunthika, komanso omasuka.Ma cores okhazikika ndi omwe amatsatana ndi kukoka komwe amafa (mwachitsanzo, komwe amafa amatseguka), chifukwa chake amakhazikika, kapena amamangiriridwa ku imfayo.Ma cores osunthika ndi omwe amayang'ana mwanjira ina iliyonse kusiyana ndi momwe amakokera.Miyendo iyi iyenera kuchotsedwa pamphepete mwakufa pambuyo poti kuwomberako kulimba, koma asanafe otseguka, pogwiritsa ntchito njira yosiyana.Ma slide amafanana ndi ma cores osunthika, kupatula ngati amagwiritsidwa ntchito popanga malo ocheperako.Kugwiritsa ntchito ma cores osunthika ndi ma slide kumawonjezera kwambiri mtengo wamafa.Ma loose cores, omwe amatchedwanso pick-outs, amagwiritsidwa ntchito popanga zinthu zovuta, monga mabowo a ulusi.Ma cores otayirirawa amalowetsedwa mu kufa ndi dzanja musanayambe kuzungulira kulikonse ndikutulutsidwa ndi gawo kumapeto kwa kuzungulira.Pakatikati pake iyenera kuchotsedwa ndi manja.Mitundu yotayirira ndi mtundu wokwera mtengo kwambiri wa pachimake, chifukwa cha ntchito yowonjezera komanso nthawi yowonjezereka yozungulira.Zina zomwe zili m'mafawa ndi monga njira zoziziritsira madzi ndi zolowera m'mizere yolekanitsa.Mpweya umenewu nthawi zambiri umakhala waukulu komanso wopyapyala (pafupifupi 0.13 mm kapena 0.005 mkati) kotero kuti chitsulo chosungunula chikayamba kuwadzaza chitsulo chimalimba msanga ndikuchepetsa zidutswa.Palibe zokwera zomwe zimagwiritsidwa ntchito chifukwa kupanikizika kwakukulu kumatsimikizira chakudya chopitirira chachitsulo kuchokera pachipata.

Zofunika kwambiri zakuthupi zakufa ndi kukana kutenthedwa kwa kutentha ndi kufewetsa pa kutentha kwakukulu;zinthu zina zofunika monga kuuma, machinability, kutentha kuyang'ana kukana, weldability, kupezeka (makamaka chachikulu kufa), ndi mtengo.Kutalika kwa moyo wakufa kumadalira mwachindunji kutentha kwa chitsulo chosungunuka ndi nthawi yozungulira.[16]Mafa omwe amagwiritsidwa ntchito poponya kufa nthawi zambiri amapangidwa ndi zitsulo zolimba zolimba, chifukwa chitsulo chosasunthika sichingathe kupirira kupsinjika kwakukulu komwe kumakhudzidwa, chifukwa chake kufa ndi okwera mtengo kwambiri, zomwe zimapangitsa kuti pakhale ndalama zoyambira.Zitsulo zomwe zimaponyedwa pa kutentha kwakukulu zimafunikira kufa kuchokera kuzitsulo zapamwamba za alloy.

Njira yolephereka kwambiri pakufa kwa kufa ndikuvala kapena kukokoloka.Njira zina zolephera ndikuwunika kutentha komanso kutopa kwamafuta.Kuwunika kutentha ndi pamene ming'alu ya pamwamba imapezeka pakufa chifukwa cha kusintha kwakukulu kwa kutentha pamtundu uliwonse.Kutopa kwamafuta ndi pamene ming'alu ya pamwamba imachitika pakufa chifukwa cha kuchuluka kwa mizere.