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本文通过对大型曲轴用钢３５ＣｒＭｏ 的热力模拟试验和数据处理，探讨了曲轴弯曲镦锻的热成形机制，研究了变形温度、应变速率等参量对３５ＣｒＭｏ 钢应力应变关系和再结晶特征的影响。建立了该类钢热成形的材料模型、给有限元数值模拟曲轴弯曲镦锻热成形过程提供了基本数据，也为大型曲轴热成形力能参数和温度制度的合理确定提供了科学依据。材料模型的确定，对于研究热成形实质，预报与控制工艺质量和产品质量乃至新工艺开发都有重要意义。
In this paper, the thermoforming mechanism of crankshaft bending upsetting was discussed through the thermal simulation test and data processing of 35CrMo steel for large crankshaft. The effects of deformation temperature and strain rate on the stress-strain relationship and recrystallization characteristics of 35CrMo steel were studied. The material model of thermoforming for this kind of steel was established, which provided the basic data for numerical simulation of hot forming process of crankshaft bending upsetting by numerical simulation. It also provided a scientific basis for the reasonable determination of thermomechanical parameters and temperature system of large crankshaft. Material model to determine the nature of the thermoforming, forecasting and control of process quality and product quality and even the development of new processes are of great significance.