Although there are many factors influencing die-casting die failure

thermal stress and mechanical stress subjected in working process are main responsible for the failure.The temperature field of a die casting die from a factory was simulated to understand the key parameters influencing temperature field changes in mould.The die-casting process was divided into four stages:die casting-solidification

open mold-pick up

spraying-clamping

clamping-next die-casting

and coupling numerical simulation for thermal stress and mechanical stress was conducted.Through analyzing stress changes at different area from different cross-sections

stress change mechanism was presented at different processing parameters

providing a data reference to predicting service life of mould.