The failure of a die casting fixed core was described

such as ablation

crack and aluminization

and the causes of the failure was analyzed. Mould repair was divided into marking

welding

digital control milling and electrical discharge machining processes

and the quality of the repaired mould could meet the technical requirements. Meanwhile

the measures to improve the service life of die casting mould were discussed

including reasonable structure design of die casting mould

proper choice of die material

optimization of heat treatment process

proper operating environment and standard maintenance.