关键词: 磨料流抛光, 流场仿真, 磨粒运动, 铝合金气缸

Abstract:  In response to the precision machining of frictionless aluminum alloy cylinder with anodized oxide films, a composite spiral abrasive flow polishing method was proposed. A simulation model was established to analyze the collision between particles and the wall in polishing processes, and the influences of particle velocity in different directions on polishing were investigated. The processing mechanism of the composite spiral abrasive flow polishing was revealed. The simulation results show that the composite spiral motion changes the trajectory of the abrasive particles, and the addition of rotational velocity enhances the effective stress of the abrasive. The effective plastic deformation of the wall increases with the spiral groove speed. Particle image velocimetry observation experimental results demonstrate that the composite spiral motion increases the rotational velocity of the abrasives and enhances the vorticity of the flow field. The experimental results show that the composite spiral abrasive flow polishing not only causes less damages to the aluminum alloy anodized film, and effectively improves the surface quality of the workpieces.

Key words: abrasive flow polishing, flow field simulation, particle motion, aluminum alloy cylinder