Abstract:

Based on the Box-Behnken combination design,a force-constant burnishing tool was used to burnish AL 6061 specimens,followed with fretting experiments on a SRV IV test machine.During the burnishing,the cutting feed,the burnishing force and the number of passes were selected as the independent variables,and the fretting wear volumes of AL 6061 under lubricated and dry conditions at 100 ℃ after the burnishing were used as the responses.A formula calculating the fretting wear volume of non-planar specimen was deduced,and the fretting friction coefficient,the initial surface roughness and the surface morphology of wear scars were analyzed.The results indicate that,under dry conditions,the burnishing has no obvious influence on the fretting wear behaviors of AL 6061,and that,under lubricated conditions,the average fretting wear volume of the burnished surface decreases by 21.5%,as compared with that of the un-burnished surface.Moreover,it is found that,in the optimal burnishing conditions,that is,burnishing at a cutting feed of 0.10 mm/r and a burnishing force of 60 N with one pass,the fretting wear volume reaches the minimum,which is only 46.2% of the average fretting wear volume of the un-burnished surface.

Key words: burnishing, fretting wear, friction coefficient