Influence of Part's Stiffness on Surface Integrity Induced by a Finish Turning Operation of a 15-5PH Stainless Steel

The turning process is well known to modify the surface integrity, and especially the residual stress profile as well as the surface roughness. Most of the past investigations have been conducted with large and stiff samples, whereas many small parts are machined in industry. So this paper aims at characterizing the influence of part's stiffness on residual stresses and on surface roughness when machining a 15-5PH steel. It is highlighted that a lack of stiffness can dramatically modify the residual stress state in the surface due to radial vibrations and can lead to large deviations of the surface integrity state.