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Comparative assessment of lubri-cooling conditions when turning CP-Ti Grade 4 based on surface roughness

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Abstract

The unique combination of corrosion resistance, mechanical properties, and biocompatibility have made commercially pure titanium (CP-Ti) widely used as bio-implant materials. The bio-implant requires high-quality surfaces, with specific characteristics for each utilization. Due to high temperatures in the cutting zone and the high chemical affinity, titanium is usually machined with cutting fluid. However, the environmental impacts drive research towards eliminating or reducing the utilization of these fluids. Therefore, a Box-Behnken Design of experiments was used to investigate the effects of cutting parameters (cutting speed, feed rate, and depth of cut) and lubri-cooling conditions (dry, MQL, RQL, and conventional flood) on the surface roughness after turning CP-Ti (grade 4). Statistical analysis confirmed that the feed rate is the most significant cutting parameter for controlling surface roughness, and it must be kept at a low level to improve the surface finish. The analysis of the results indicates that each lubri-cooling atmosphere requires appropriate levels of cutting speed and depth of cut to enhance the workpiece surface finish. The optimization of the experiment through the desirability function showed that RQL turning is the best choice to minimize surface roughness on CP-Ti Grade 4.

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Acknowledgements

The authors thank Primuss Co. for the workpiece material, Quimatic/Tapmatic Co. for the nebulizer and cutting fluid applied in MQL/RQL conditions, Bondmann Chemistry Co. for the cutting fluid used in flood machining, and LAMEF/UFRGS for the workpiece chemical analysis.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Laboratory of Automation in Machining (LAUS), Department of Mechanical Engineering (DEMEC), Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil

    Fabio Telles, Heraldo J. Amorim & André J. Souza

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  1. Fabio Telles
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  2. Heraldo J. Amorim
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  3. André J. Souza
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Correspondence to André J. Souza.

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Telles, F., Amorim, H.J. & Souza, A.J. Comparative assessment of lubri-cooling conditions when turning CP-Ti Grade 4 based on surface roughness. Int J Adv Manuf Technol 113, 365–378 (2021). https://doi.org/10.1007/s00170-021-06672-9

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