Shafts Hardening by Rolling - A Short Review

Rolling process, as one of the processes of Cold Surface Plastic Deforming of metals (CSPD), leads to mechanical, physical and structural transformations in the depth of the material or only at the surface layer, similar in effect, but with different weights in comparison with operations such as rolling, drawing, extrusion, forging, or machining by cutting (grinding, superfinishing), due to the lower values of the degree of deformation of the metallic material, generated by the much lower values of the parameters of the working regime. The condition of the surfaces resulting from the CSPD process is generated and influenced by a number of factors and can be assessed by a set of indicators such as: surface roughness, hardness of the deformed surface layer, depth of the roughened surface layer, residual stresses and machining productivity. The paper presents the advantages and process parameters and details the qualitative indicators of the CSPD process with the presentation of some experimental results from the technical literature.