Abstract In recent years, advances in nanotechnology have been positively reflected in the manufacturing industry, as in many other fields. Owing to their physical and chemical aspects, the nano-sized solid lubricants can help to improve the tribological and thermal properties when added to aerosols, suspensions and emulsions. In order to achieve high efficiency in machining operations, this phenomenon provides an opportunity to perform the tasks expected from a coolant/lubricant. Therefore, this study aimed to investigate the influence of cutting fluid reinforced by multi-walled carbon nanotubes (MWCNTs) into vegetable based cutting fluid on machinability characteristics of PH 13-8 Mo stainless steel that has excellent mechanical properties. For this, Taguchi's L27 (33) orthogonal array involving three factors and their three levels such as cutting speed of 120, 180, 240 m/min, feed rate of 0.1, 0.15 and 0.2 mm/rev and three C/L environment i.e., dry, pure-MQL (0 vol% of nano-additives) and MWCNTs mixed nanofluid-MQL were taken as process parameters. In this experimental design, surface roughness and peak temperature in cutting zone were considered as responses. Moreover, to analyze only the influence C/L environment on tool wear, wear mechanisms and surface topography, a series of experiments were conducted by preserving other machining parameters. As a result, approximately 5% and 12% lower surface roughness was achieved with pure-MQL and nanofluid-MQL, respectively. The reduction in flank wear was found to be 40.2% and 69% under cutting environment, i.e., pure-MQL and MWCNTs mixed nanofluid-MQL.

中文翻译：

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MWCNTs混合纳米流体对PH 13-8 Mo不锈钢切削加工性能影响的研究

摘要 近年来，纳米技术的进步在制造业和许多其他领域得到了积极的反映。由于其物理和化学特性，纳米级固体润滑剂在添加到气溶胶、悬浮液和乳液中时有助于改善摩擦学和热学性能。为了在加工操作中实现高效率，这种现象提供了执行冷却剂/润滑剂预期任务的机会。因此，本研究旨在研究由多壁碳纳米管（MWCNT）增强的切削液加入植物基切削液对具有优异机械性能的 PH 13-8 Mo 不锈钢切削性能的影响。为此，田口' s L27(33)正交阵列涉及三个因素及其三个水平，例如切削速度120、180、240 m/min，进给速度0.1、0.15和0.2 mm/rev和三个C/L环境即干燥、纯-MQL（0 vol% 的纳米添加剂）和 MWCNTs 混合纳米流体-MQL 作为工艺参数。在该实验设计中，切削区的表面粗糙度和峰值温度被视为响应。此外，为了仅分析 C/L 环境对刀具磨损、磨损机制和表面形貌的影响，通过保留其他加工参数进行了一系列实验。因此，使用纯 MQL 和纳米流体 MQL 分别实现了约 5% 和 12% 的低表面粗糙度。发现在切削环境下，即纯 MQL 和 MWCNTs 混合纳米流体 MQL 下，后刀面磨损的减少分别为 40.2% 和 69%。