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Improvement of surface finish by ball burnishing:approach by fractal dimension

Auteurs : M. BOUREBIA, L. Laouar, H. Hamadache & S. Dominiak
Année : 2016
Domaine : Génie mécanique
Type : Publication
Revue : Surface Engineering
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : roughness, fractal dimension, Burnishing process, Designs of experiments

Résumé :

The surface roughness significantly affects the quality of parts and their functional properties suchas contact surface, as well as coating adhesion. The machined surface quality is evaluated byarithmetic deviation Ra which does not suffice to describe the surface irregularities. In order toapprehend these deficiencies a new technique based on fractal geometry was introduced. Toapply this concept an experimental work was carried out to characterise surface quality byfractal dimension ‘D’. The operations of burnishing ball were performed according to plans ofexperiments of ‘Box–Behnken’, an optimal regime was obtained and a mathematical model wascleared for predicting the fractal dimension ‘D’ as a function of treatment regime parameters.Furthermore, the application of optimal regime under several passes ‘i’ has enabled to examinethe evolution of ‘D’. The results confirm that fractal dimension ‘D’ has impact on surface qualityand tribological parameters.