工艺参数对转子屏蔽套真空热胀形影响的模拟

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。

Modeling Effects of Process Parameters on Vacuum Hot Bulge Forming of Rotor Cans

A 2-D axisymmetric finite element model of vacuum hot bulge forming of rotor cans was established. With the aid of user subroutine of non-linear finite element software MSC.Marc, the creep constitutive model of Hastelloy C-276 was coupled with the FEM model to simulate the vacuum hot bulge forming process of the rotor can. The transient temperature field and the radius-direction displacement field of the rotor can and the die during vacuum hot bulge forming process were calculated. The bulging dimension of the rotor can was predicted. The effects of process parameters such as die thickness, holding time and holding temperature on the bulging dimension of the rotor can were studied on the basis of the developed model. The vacuum hot bulge forming experiment was conducted. The simulated results are in good agreement with the experimental ones