EFFECTS OF BURNISHING AND PEENING ON THE PROPERTIES OF MACHINED SURFACES

Abstract

Burnishing and peening are two of the most popular post machining operations used to improve upon the functional perfor-mance of machine components. The functional performance is mainly evaluated by surface properties viz.,surface roughness, hardness, wear resistance, load bearing characteristics, fatigue strength, resistance to corrosion etc. Some of the parameters influencing the performance characteristics are geometrical features of the surface (both micro and macro), degree of cold work and nature and magnitude of induced surface residual stresses. Survey of literature shows that these processes have been extensively used to improve upon the characteristics of a variety of components. However, it was also revealed that there is a lack of systematic research on the degree of improvement in surface finish, hardness,wear resistance etc. The process para-meters and the nature of interaction existing between them have not been evaluated properly and hence an optimum selection of the operating parameters, for the given situation is not possible.