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The high costs and problems in finishing machining, especially aluminum alloys, have increased the importance of surface treatment processes without chipping, such as burnishing. In this paper, in the burnishing process of AA7075-T6 aluminum plate, the effect of vertical depth and lateral pass on the surface roughness was experimentally studied with a new approach of choosing the lateral pass as a variable depending on penetration radius of the burnishing. The results of interaction effects of the input parameters showed that, in general, the quality of the surface increases with the reduction of the lateral pass and vertical depth. At lower values of vertical depth, with the increase of lateral pass, the increase of surface roughness occurs with a slower slope which shows that in the lower vertical depths, a larger lateral pass can be used to achieve the desired surface quality in a shorter process time. The highest percentage of surface roughness improvement was about 96%. Simultaneous examination of the results of roughness and process time showed that burnishing with vertical depth and lateral pass of 0.04 and 0.33 mm, respectively, which improves the surface roughness by 86.63% in an effective time of 1.86 minutes, had the best performance index.
 

Keywords: Burnishig, Surface Roughness, AA7075-T6

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