A new design technique for the long life hot forging die has been proposed. By finite elementanalysis, the reason for the failure of hot forging die was analyzed and it was concluded thatthermal stress is the main reason for the failure of hot forging die. Based on this conclusion, thewhole hot forging die was divided into the substrate part and the heat-resistant part accordingto the thermal stress distribution. Moreover, the heat-resistant part was further subdivided intomore zones and the material of each zone was reasonably selected to ensure that the hotforging die can work in an elastic state. When compared with the existing techniques, this design cangreatly increase the service life because the use of multi-materials can alleviate the thermalstress in hot forging die.
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