薄壁筒形件强力旋压有限元建模及优化分析

Finite element modeling and optimization analysis on power spinning of the thin-wall cylinder

介绍了基于MSC.MARC软件的双重退火态30Cr3SiNiMoV材料的薄壁筒形件强力旋压有限元建模技术,内容包括:弹塑性本构关系、单元网格类型选择与划分、坯料几何模型的建立与优化。分析对比了两种本构模型(Voce模型和Ghosh模型)、两种单元网格类型(四面体网格和六面体网格)以及3种坯料几何模型(1/12无过渡模型、1/12过渡模型和整体过渡模型)对薄壁筒形件强力旋压有限元模型的计算效率及精度影响。分析计算结果表明,对于双重退火态30Cr3SiNiMoV材料,采用Ghosh流动应力模型较为合适;四面体网格更适于减薄率较大的旋压成形模拟,且计算效率高,精度也在可接受范围内;1/12过渡模型较适合薄壁筒形件旋压成形有限元模拟。并通过旋压成形试验验证了所建立模型的可靠性。

For the double annealed 30Cr3 SiNiMoV of the thin - wall cylinder, the power spinning FE modeling technology dealing with the elastic - plastic constitutive relationship, the type selection and division of elements, and the establishment and optimization of cylinder geometry was introduced by MSC. MARC software. The effect of two kinds of constitutive models （ Voce model and Ghosh model） , two kinds of element mesh types （Tetrahedral mesh and hexahedral mesh） and three kinds of geometries models of original sample （1/12 un- transition model, 1/12 transition model and whole transition model） on the computational accuracy and efficiency of FE model during the process of power spinning for the thin - wall cylinder were analyzed and compared. The results show that it is more suitable to apply the Ghosh flow stress model to the double annealed 30Cr3SiNiMoV; tetrahedral mesh and 1/12 geometric model are more suitable for simula- tion spinning process of larger thinning rate with its high computational efficiency and accuracy within the acceptable range; 1/12 transi- tion model is fit for simulation spinning process of the thin-wall cylinder too. Finally, the FE model is validated by the experiments.