液体喷射抛光技术材料去除机理的有限元分析

Analysis of material removal mechanism in fluid jet polishing by finite element method

实验研究了液体喷射抛光技术的材料去除量分布特征,并利用有限元分析方法,分析了抛光头(液体柱)与工件表面相互作用时流场的分布特点。实验结果及计算机模拟的结果表明,材料去除量与射流碰撞工件后流体沿工件表面的速度有关,即材料去除量的分布与抛光液在工件表面速度场的分布有关,速度分布最大的边缘部分,材料去除量最大;相互作用区外,速度逐渐减小,材料去除量也随之渐少。该现象说明,抛光液中磨料粒子的径向流动对工件产生的径向剪切应力是材料去除的关键。

Distribution of removed material in Fluid Jet Polishing （FJP） was investigated in experiments. The characteristics of fluid velocity and pressure on the sample surface were simulated using Finite Element Method （FEM） when the fluid jet impacts the work piece. The experimental and simulating results show that the distribution of removed material is related to that of fluid velocity field after collision of the slurry jet with wok piece, that is to say, the maximum amount of removed material appears on the edge of impacted area where the fluid velocity has the maximum value; In the outside, the less material removal is due to the smaller velocity. Thus, it is concluded that the collision and shearing actions caused by the radial flowing of slurry play a dominant role in material removal in FJP.