Prediction technology of electron beam welding deformation for aeroengine rotor components
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摘要: 航空商用发动机组件尺寸精度要求较高，且组件焊接后盘心位置不能进行机械加工，因此采用数值模拟的方法对转子组件进行焊接变形预测. 试验将基于热弹塑性理论计算提取固有应变数值；通过理论计算得到GH4169合金电子束焊缝的固有应变值，分析焊接工艺参数对焊缝固有应变的影响规律；建立结构件模型，分析焊接工艺、焊接顺序及工装条件下组件焊接变形. 结果表明，相比于第一，第二和第三级盘，第四级盘心轴向变形最大，且通过增大扫描速度和改变约束方式的方法可以有效减小焊接变形，从而完成对转子组件焊接变形进行预测和控制.Abstract: The aircraft engine components require high dimensional accuracy, and the position of the core after welding cannot be machined. Therefore, the numerical simulation is used to predict the welding deformation of the rotor assembly. The experiment calculates the inherent strain value based on the theory of thermal elastoplasticity; calculate the inherent strain value of the electron beam welding of GH4169 alloy and analyze the influence of welding parameters on the inherent strain of the welding process; establish the structural model and analyze welding deformation of components under different welding parameters, sequences and fixtures. The result shows that the fourth-stage disc core has the largest axial deformation compared to the first, second and third discs, and the welding deformation can be effectively reduced by increasing the scanning speed and changing the fixtures. Therefore, the welding deformation of rotor assembly can be successfully predicted.
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