高压气体淬火工艺有限元模拟及其工艺参数评估

Finite Element Simulation and Technical Parameters Evaluation of High Pressure Gas Quenching

用有限元技术对气体淬火工艺进行了模拟。以零件表面平均硬度、表面硬度标准差、平均表面等效残余应力、表面残余应力的标准差、零件的变形程度为目标建立了评估函数,以换热系数、预热温度、淬火气体的温度为目标变量,研究了工艺参数对淬火结果的影响。结果表明,换热系数是影响淬火结果的主要因素,淬火介质的温度及零件的预热温度对于零件淬火后的性能影响很小;在工艺参数优化时,换热系数是一个理想的目标变量。

Finite element method is used to simulating the high pressure gas quenching. The evaluation functions are built on the average surface hardness, standard deviation of surface hardness, average equivalent residual stress of surface, standard deviation of surface equivalent residual stress and distortion of quenching part. The effects of technical parameters to quenching result are researched, heat transfer coefficient, preheat temperature and quenchant temperature are regarded as the object variable. The results show that the heat transfer coefficient is the most important factor of affect the quenching results, preheat temperature and quenchant temperature have a little effect on the quenching result. The heat transfer coefficient is a perfect object variable to optimize.