Effect of cylindrical longitudinal grinding process on surface integrity of 18CrNiMo7–6 steel

Abstract

In order to explore the influence of the grinding process parameters on the surface roughness and surface layer residual stress of 18CrNiMo7–6 steel, the cylindrical longitudinal grinding experiment was carried out by using an end cylindrical grinder. With using the workpiece speed nw, grinding depth ap and longitudinal feed speed vf, the single-factor experimental research is carried out. The research results show that with the increase of nw, the surface roughness Ra of the workpiece decreases first and then increases. When nw is 120 r/min, the surface roughness Ra reaches the minimum value, and the surface residual compressive stress value is the largest at this condition, and when nw is greater than 120 r/min, the surface residual stress exists fluctuation. With the increase of ap, the surface roughness Ra of the workpiece decreases first and then increases, and the tensile stress influence on the surface layer of the workpiece increases with the increase of the grinding depth. The surface roughness Ra first decreases and then increases with the increase of vf. When vf is 210 mm/min, the surface roughness value Ra is the smallest. With the increase of vf, the residual compressive stress of the surface layer gradually decreases and gradually changes to increasing residual tensile stress.

Keywords

• cylindrical longitudinal grinding
• grinding process
• surface roughness
• residual stress
• 18crnimo7–6 steel