Tushen ƙirƙira shine samfurin da aka gama gamawa na ƙirar, wanda ya ƙunshi kayan haɗin ƙarfe daban-daban. Ana iya cewa shi ne kwarangwal na dukan mold.
Domin daban-daban sansanonin simintin gyare-gyare suna da tsari daban-daban ta fuskoki daban-daban, aikace-aikacen su ma sun bambanta.
A "mara misali" a cikin sunan da ba misali mold tushe yana nufin maras misali, kuma wannan maras misali ne bayyana a da yawa al'amurran da mold tushe.
Madaidaicin tushe kayan aiki ne da ake amfani da shi don ƙirƙirar abubuwa. Wannan kayan aiki yana kunshe da sassa daban-daban, kuma madaidaicin madaidaicin sansanonin sun ƙunshi sassa daban-daban.
Duk samfuran dole ne a ɓata su. Don ginshiƙan ƙirar ƙira ɗaya, ana buƙatar siffar chamfer don zama iri ɗaya. Matsakaicin kashi 45%. Girman duk ramukan akan samfurin gabaɗaya (0.5 ~ 1mm) X45°.
A lokacin sarrafa mold Maganin zafi mara kyau zai haifar da tsagewar mold da ɓarkewar wuri, musamman idan kawai ana amfani da quenching da tempering, ba tare da quenching ba, sannan tsarin nitriding na saman, fashewar saman da fashewa zai faru bayan dubban mutuwar-simintin.
