连杆热模锻全过程的仿真分析及模具寿命预测

在考虑连杆热模锻模具的材料性能和工况条件基础上，采用有限元分析软件Msc．Superform对连杆热模锻全过程进行了非线性、大变形热机械耦合分析。实现了对连杆热模锻模具关键部位的弹塑性变形的全过程动态模拟仿真，得到了温度场、等效塑性应力应变场在时间和空间上的分布规律，研究结果符合实际情况，具有现实意义。在此基础上，运用Coffin-Mansion公式对所计算的模具寿命进行了预测，其结果与实际应用中的模具寿命基本一致，为进一步研究不同工况下热模锻成形控制和终锻成形模具结构设计提供了理论依据。

Simulation of Total Process for Connecting Rod Thermal Die Forging and Calculating Life

The models of the total process for connecting rod thermal die forging have been studied with finite element method. The coupling results of thermal and mechanical have been simulated. Dynamic simulations of the deformation process, the changing of temperature and equivalent plastic stress and strain have been realized. Theresearch result conforms to the actual status and has practical significance. The life of thermal die forging resultingfrom the thermal mechanical fatigue small cracks to failure has been calculated. With this method, the lifetimeprediction gives results corresponding well to the actual status. The results provide some reasonable principles for theshape control of the thermal die forging as well as the structural design of the finished-forging die.