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提出了粘性介质压力缩径成形方法,利用粘性介质力学性能和易于实现的加载方式,延缓缩径过程失稳并在一定条件下消除失稳产生的褶皱,提高极限缩径量。多道次成形可以将一个较大的目标变形量分成多步小变形,控制每道次变形于失稳起皱范围内,较一次成形可以显著提高材料成形能力。采用有限元分析的方法研究了粘性介质外压多道次的缩径过程,得到了每一道次缩径后长径比和壁厚变化综合作用影响下一道次极限缩径量的结论。
In this paper, the pressure-reducing forming method of viscous medium is put forward. By using the mechanical properties of viscous medium and the easy-to-implement loading method, the instability of the shrinking process can be delayed and the buckling caused by instability can be eliminated under certain conditions. Multi-pass forming can be a large target deformation is divided into multi-step small deformation, deformation control each instability in the range of unstable wrinkling, a single forming can significantly improve the material forming ability. The multi-pass diameter reduction process of viscous medium under external pressure was studied by the finite element analysis method. The conclusion of the next subliminal reduced diameter influenced by the combined effect of the aspect ratio and the wall thickness change was obtained.