14th International Conference on Shot Peening

Surface patterning using customized shots

A. Heydari Astaraee, E. Alfredo Rajme López, S. Bagherifard, M. Guagliano

Department of Mechanical Engineering, Politecnico di Milano, Milano, Italy asghar.heydariastaraee@polimi.it; emilioalfredo.rajme@mail.polimi.it; sara.bagherifard@polimi.it; mario.gaugaliano@polimi.it

Introduction

Surface texturing is based on generating patterns or textures with tiny features on the material surface to improve superficial functionalities [1]. The type and size of the features depend on the specific texturing technique. Surface texturing can alter surface roughness, tribological properties, energy-related performances such as wettability, capillarity, and aesthetics. Several texturing techniques such as ion-beam etching, electrochemical machining, micro-milling, lithography, laser processing, hot embossing, and mechanical texturing have been studied in the past, especially for polymeric materials.

Objectives

In this study, the potential of shot peening is explored in the surface texturing of acrylonitrile butadiene styrene (ABS) using custom 3D-printed shots. In contrast to many other techniques, shot peening does not involve material removal, or the need for high temperatures or pressures, can be relatively fast and cheap, and considerably scalable with a high capacity for industrialization. Various shot designs are proposed, and the surface textures created through peening are studied experimentally and numerically in terms of morphology and standard roughness.