Influence of the mechanical and metallurgical state of an Al-Mg alloy on the surface integrity in ultraprecision machining

• Autor(a) principal: Jasinevicius,R. G.
• Data de Publicação: 2003
• Outros Autores: Campos,G. P. de, Montanari,L., Tsukamoto,R., Garcia,J. P., Camargo,R., Duduch,J. G., Porto,A. J. V.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782003000300002
• topic: Ultraprecision; Diamond Tools; Surface Finish; Surface Integrity; Turning

This work presents the experimental results of the facing turning of an Al-Mg alloy. This aluminium alloy was mechanically and metallurgically modified, by means of cold rolling reduction and refining grain size previous to machining. The samples were cut and compared with samples in the as-received form, machined under the same cutting conditions. Surface finishing and work hardening were measured. Results show that theoretical surface roughness values are always smaller than the measured ones for all samples. Also, the surface roughness of the as-received samples is larger than that of mechanically modified samples. This difference of surface roughness was attributed to the swelling effect of the material. Microhardness values of the machined samples showed a decreasing trend with increasing loads. The surface of the cold rolled sample did not present a detectable microhardness alteration. Optical microscopy was used to observe qualitative aspects of the machined surface.