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建立了转子屏蔽套真空热胀形过程的二维轴对称有限元模型。借助非线性有限元软件MSC.Marc的二次开发功能,将Hastelloy C-276合金的蠕变本构模型与真空热胀形过程的有限元模型相结合,模拟了转子屏蔽套的真空热胀形过程。计算了真空热胀形过程中转子屏蔽套和模具内部的瞬时温度场和径向位移场,预测了转子屏蔽套的胀形量。研究了模具厚度、保温时间和保温温度等工艺参数对转子屏蔽套真空热胀形胀形量的影响。开展了真空热胀形工艺实验,模拟结果与实验结果吻合较好。
A two-dimensional axisymmetric finite element model of rotor thermal sleeve was established. With the secondary development of nonlinear finite element software MSC.Marc, the creep constitutive model of Hastelloy C-276 alloy was combined with the finite element model of vacuum thermal expansion process to simulate the vacuum thermal expansion of rotor shield sleeve process. The instantaneous temperature field and radial displacement field inside the rotor shield and the mold during vacuum thermal expansion are calculated, and the amount of bulging of the rotor shield is predicted. The effects of process parameters, such as mold thickness, holding time and holding temperature, on the amount of bulging bulging of rotor shield were investigated. The vacuum hot bulge forming process experiment was carried out. The simulation results are in good agreement with the experimental results.