Experimental Investigation in Vibration Polishing of ZL205A

In aviation, aerospace and other military industries, there are varieties of metallic parts containing irregular curved flow channels, which are limited by space and difficult for ordinary tools to reach for polishing to improve the surface quality. Aiming at mechanical polishing of complex flow channels in metallic parts, experiments with vibration polishing were conducted to research the influence of machining parameters, such as vibration direction, vibration frequency, vibration time and vibration amplitude, on the surface roughness of ZL205A. The experimental results show that different vibration directions during machining have different effects on the surface roughness of the workpiece. The surface roughness with the vibration direction perpendicular to the surface of workpiece is lower than that parallel to the surface; improvement of the vibration frequency, amplitude, or the vibration time can effectively reduce the surface roughness. The results indicate that the method of vibration polishing can be applied to improve the surface quality of curved flow channels of metallic parts. Finally, flow channel of casting impeller with surface roughness 0.182 μm is obtained by vibration polishing machining.