面向Ti-6Al-4V合金的开缝芯棒孔挤压强化次数研究

Research on Hole Expansion Strengthening Times of Split Mandrel for Ti-6Al-4V Alloy

为了探究挤压强化次数对开缝芯棒性能的影响,实现孔挤压强化工具的可重复使用,分析了开缝芯棒孔挤压强化工艺,开展了开缝芯棒20次孔挤压强化Ti-6Al-4V合金试验,研究了挤压强化次数对开缝芯棒孔挤压强化效果的影响。结果表明,开缝芯棒20次孔挤压强化过程中,挤压力、工作环直径和孔结构孔径波动平缓,未发生显著变化;开缝芯棒的挤压部位存在划痕,工作环直径与孔结构孔径的变化在加工误差范围内;开缝芯棒的划痕对Ti-6Al-4V合金孔结构挤压强化效果影响不大,开缝芯棒孔挤压强化能够实现孔挤压强化工具的重复使用。

In order to investigate the effect of expansion strengthening times on the performance of split mandrel and achieve the reusability of hole expansion strengthening tools,the hole expansion strengthening process of split mandrel was analyzed.Twenty times hole expansion strengthening experiments of split mandrel were conducted on Ti-6Al-4V alloy,and the effect of expansion strengthening times on the hole expansion strengthening effect of split mandrel was studied.The results indicate that the fluctuation of expansion pressure,working ring diameter,and hole structure aperture during twenty times hole expansion strengthening of the split mandrel are gentle,without significant changes.There are scratches on the expansion part of the split mandrel,and the changes in the diameter of the working ring and the hole structure aperture are within the machining error range.The scratches on the split mandrel have little effect on the Ti-6Al-4V alloy hole structure expansion strengthening effect,and the hole expansion strengthening of the split mandrel can achieve the reuse of the hole expansion strengthening tool.