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1 Archives of Materials Science and Engineering

1 2011

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Effects of drill microgeometry and cooling supply in the surface integrity

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Zeilmann R. , Vacaro T. , Bordin F.

Archives of Materials Science and Engineering

2011

tom Vol. 49, nr 2

118-124

Purpose: The objective of this paper is to investigate the effect of drill microgeometry and cooling supply in the surface integrity of machined holes. The changes in the holes surface and subsurface due to differences on tools features were presented. Design/methodology/approach: Two types of carbide drills with differences in microgeometry and internal/external cooling were used in the machining of SAE 1045 steel. The surface integrity of the holes was evaluated in terms of surface and subsurface quality. The holes surface was examined using optical microscopy (texture) and roughness measurement. The subsurface analysis included plastic deformations, and micro and nanohardness. Findings: The differences in the cooling supply and drills microgeometry showed influence on surface integrity results. The drill type with internal cooling and improved microgeometry produced holes with a smoother surface and subsurface changes of lower magnitude. The most influent feature of microgeometry was the margin thickness. The drill with a thicker margin presented better results, mainly due to friction reduction. Practical implications: The performed investigations could be useful in the industrial practice and give the information for tool selection in drilling of SAE 1045 steel, which is very used in mechanical components industry. Originality/value: The paper shows the importance of analysing the effect of differences of tools features in surface integrity, which is often neglected, but has great influence on the components performance, mainly under severe mechanical and thermal loads. This work also presents the benefits in surface integrity due to drills microgeometry improvement.