磨料流引流段间隙法的应用研究

Study on Application of Gap-guide Segment in Abrasive Flow Machining

为解决量产工件尺寸波动而导致引流段尺寸无法确定的问题,提出了引流段间隙放置的方法,即利用磨料在空隙内堆积来形成新的引流段。选取某机精密接头为例,分析了引流段间隙法的原理和间隙内磨粒的受力情况;通过Fluent仿真方法对比了不同间隙距离下入口处磨料速度迹线和剪切力的分布情况,仿真结果发现引流段间隙3mm放置时具有较好的效果,有效缓解了倒圆的形成,并通过加工实验验证了其效果。

In order to solve the problem that the size of guide section can not be determined due to the fluctuation of workpiece size in mass production,the gap-guide section was applied.The way of gap-guide segment is put forward to form the new guide segment with the abrasive.The principle of gap-guide segment and the force of abrasive particles in gap were analyzed.Taking precision joints as an example,the abrasive velocity trace and shear force distribution at the entrance under different gap distances were compared by Fluent.Theoretical analysis and numerical simulation show that when the size of gap was 3 mm,the problem of rounding was alleviated,and the conclusion was verified by the experiment.