Den såkaldte smedningsfejl, der refererer til smedningsdysen, kan ikke repareres for at gendanne dens anvendelse af skader, dvs. forårsaget af skader eller skrot af den almindeligt nævnte smednings matrice. Because plays a forming die chamber of the function of the forgings, it directly in contact with the hot billet, bear the function of impulse type heat load, and forging equipment applied under high energy impact load and blank metal flow scouring and embellish the role of the slip agent and other environmental media, in the mold of metallurgy and processing quality specification and normal operating conditions, forging die of damaged or destroyed Most occurred in the die chamber, therefore, the failure of forging die er hovedsageligt mugkammerfil nu kan ikke reparere metoden til at gendanne produktionen af ​​kvalificerede tilgivelsesfunktioner.