14th International Conference on Shot Peening

Definition and impact on overlapping on the surface state after deep rolling of aluminium and steel alloys

Jan Schubnella, Matthias Junga, Ardeshir Sarmasta, Eva Carla

Fraunhofer Institute of Mechanics of Materials (IWM), www.iwm.fraunhofer.de, Woehlerstr. 11, 79108 Freiburg, Germany – jan.schubnell@iwm.fraunhofer.de

Introduction

The mechanical surface treatment by deep rolling is a widely used process for the modification of the surface and subsurface properties of metallic materials and was used in many industrial applications to increase the fatigue and wear resistance [1, 2]. The influence of the deep rolling process parameters is known qualitatively [2] but there are still gaps regarding knowledge about the impact of process parameters on the surface state after treatment. Extensive experimental studies were performed for the variation of multiple deep rolling process parameters (contact pressure, tool diameter, line spacing) to minimize the surface roughness and maximize the surface near compressive residual stresses [3]. However, the aforementioned parameters are directly related to the overlapping of subsequent deep rolled lines. To reduce the optimization effort a simple estimation of overlapping is proposed and the influence on the surface state was investigated.

Objectives

The aim of this study is to quantify the effect of the process parameters (contact pressure, line spacing) on the overlapping of deep rolled lines depending on the treated material. Furthermore, the impact of overlapping on the residual stress state at the surface and on the surface roughness after hydrostatic deep rolling were investigated.