Abstract: This paper proposes a down-stroke abrasive belt grinding under micro feeding for noise reduction surface. Firstly, a physical model of processing under micro feeding for noise reduction structure was established. Based on the flexible contact characteristics of abrasive belt grinding and Hertz contact theory, a mathematical model suitable for this method was established, considering vibration and abrasive belt wear. Secondly, a simulation analysis was carried out. Then, an experimental platform was built to analyze the influence of process parameters on surface roughness and surface microstructure, with the model verified. Finally, the propeller with pit structure was simulated, and the noise reduction performance of the propeller under this method and general abrasive belt grinding was compared and analyzed. The results show that the maximum error of the model based on proposed method does not exceed 10%, and the coincidence degree of the minimum error point can reach 90% at lower feed speed and higher linear velocity of the abrasive belt. The noise reduction effect of the propeller with pit-shaped surfaces can reach 35%. Through the above analysis, the proposed method can be used for the processing of noise reduction surfaces. 

Key words: abrasive belt grinding, noise reduction surface, non-smooth surfaces, micro feeding processing