离散相磨粒粒径对磨粒流研抛共轨管质量的影响

Effect of the size of discrete phase abrasive particles on the abrasive flow polishing quality of common rail pipe

为研究磨粒粒径对磨粒流研抛质量的影响,以共轨管为研究对象,通过计算模拟不同磨粒粒径下磨粒流的状态,分别从流场动压力、速度场、磨粒的运动轨迹、湍流动能进行不同场的离散相分析。从数值分析可知,随着磨粒粒径增大,动压力、速度和湍流动能降低,磨削效果减弱。对经磨粒流研抛前后的共轨管工件进行了表面粗糙度和表面形貌的检测,测得磨粒流研抛前的表面粗糙度为3.401μm,研抛后的表面粗糙度为1.138μm,从而确认了磨粒流研抛具有内通道结构的工件的有效性,也证实了数值模拟的正确性,为磨粒流研抛技术的发展提供了理论支持。

In order to study the effect of abrasive grain size on abrasive flow polishing,common rail pipe was selected as the research object.By calculation the state of abrasive grain flow under different grain sizes,the discrete phase analysis of the flow field was carried out from the dynamic pressure,the velocity field,the abrasive grain trajectory and the turbulent kinetic energy.From the numerical analysis shows that,with the increase in the grain size,the dynamic pressure,the velocity and the turbulent kinetic energy are reduced and the grinding effect is weakened.The trajectory of the abrasive grain can be used to predict and theoretically guide the optimal control of the abrasive grinding path and the production process,thus achieving effective and accurate polishing.The surface roughness and the surface topography of the common rail pipe were measured before and after abrasive flow grinding.The surface roughness was 3.401μm before the grinding and was 1.138μm after the grinding.This verifies the effectiveness of abrasive flow polishing workpiece with inner channel structure,and confirms the correctness of the numerical analysis.This work may provide theoretical support for the development of abrasive grinding technology.