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基于ABAQUS软件采用有限元方法建立ZL205A铝合金大型复杂构件淬火过程的温度场与应力场模型,分析构件在淬火过程中不同时刻的温度场分布。根据构件结构特征,选择4个特征点获得淬火过程冷却曲线,并对构件厚壁、加强筋与薄壁部分的冷却曲线进行研究,使用有限元模拟方法预报构件变形和残余应力。ZL205A铝合金大型复杂构件淬火变形主要为径向变形,通过比较淬火后残余应力的6个分量可知正应力远大于剪应力。模拟厚壁在不同换热系数下的淬火效果,发现增加换热系数可以提高厚壁淬火冷却速度,但是作用比较有限。
Based on ABAQUS software, the temperature field and stress field model of large-scale ZL205A aluminum alloy quenching process were established by finite element method, and the distribution of temperature field at different time of quenching process was analyzed. According to the structural characteristics of the components, four characteristic points were selected to obtain the cooling curve of the quenching process. The cooling curves of thick-walled, stiffened and thin-walled sections were studied. The deformation and residual stress were predicted by finite element method. ZL205A aluminum alloy large-scale quenching deformation of the main components for the radial deformation, by comparing the residual stress after quenching 6 components shows that the normal stress is much larger than the shear stress. The simulated thick wall quenching effect under different heat transfer coefficients, found that increasing the heat transfer coefficient can increase the cooling rate of thick wall quenching, but the role is relatively limited.