Assessment of Novel Palm Oil Modifications Performance in High-Speed Milling of Inconel 718 Through Minimum Quantity Lubrication Application
摘要
Due to the exceptional properties of Inconel 718, including high yield and tensile strengths, excellent creep rupture properties up to 1500 °C, and the ability to maintain strength across a wide temperature range, machining this material, especially at high speeds, presents significant challenges. The high cutting temperatures generated during machining lead to poor performance and rapid wear of cutting tools, resulting in increased machining costs. Traditional flood cooling methods, which can negatively impact operator health and the environment, are inadequate for addressing these issues. This research evaluates the effectiveness of palm oil and nanolubricant modified with hexagonal boron nitride (hBN) using minimum quantity lubrication in the high-speed milling of Inconel 718 with an uncoated carbide tool. The results indicate that higher concentrations of hBN improve the lubricant’s viscosity. Specifically, the lubricant NPO1, with a 0.05 wt% hBN concentration, demonstrated superior tribological properties, leading to better machining performance. In contrast, the NPO3 sample showed the poorest machining outcomes, characterized by the highest cutting forces and temperatures, greatest surface roughness, shortest tool life, and most severe tool wear. Therefore, NPO1 presents a viable alternative to traditional cooling methods, offering environmental and health benefits in line with the United Nations’ Sustainable Development Goals.