为了提高热锻模寿命,采用有限元方法分析了热锻模连续工作状态下的温度场和应力场。根据温度场的分布将热锻模分为温度波动区、温度平衡区和散热区3个区,模具失效主要发生在温度波动区;根据应力场得出热应力是热锻模失效的最根本的原因。分析了降低热负荷的方法和途径,提出多金属热锻模设计方法。 In order to improve the life of hot forging die, the temperature field and stress field under continuous working condition of hot forging die were analyzed by finite element method. According to the distribution of temperature field, the hot forging die is divided into three zones: temperature fluctuation zone, temperature balance zone and cooling zone. The failure of the mold mainly occurs in the temperature fluctuation zone. According to the stress field, the thermal stress is the most fundamental of the failure of the hot forging die the reason. The methods and ways of reducing heat load were analyzed, and the design method of multi-metal hot forging die was put forward.