This research explores the machining of titanium using trochoidal milling, focusing on optimizing machining conditions to maximize productivity and tool durability. A key aspect of the study is the implementation of a coolant-lubricant supply system that delivers a mixture of liquid carbon dioxide (LCO₂) and minimum quantity lubrication (MQL). The primary objective is to analyze how varying the flow rates of LCO₂ and MQL affects machinability, particularly by measuring cutting forces and assessing the influence of different lubricating oils.
To conduct the experiments, we set up a Kistler measuring system to capture cutting forces and sound intensity, along with a measuring microscope for detailed analysis. Additionally, we prepared the raw titanium material, selected appropriate cutting tools, and configured the LCO₂ and MQL supply system. Preliminary tests were also carried out to evaluate the mixing behavior of various oils with LCO₂.
The experimental results indicate that increasing the LCO₂ flow rate leads to higher cutting forces due to material subcooling. Similarly, a reduction in the MQL flow rate results in increased forces, negatively impacting machinability. Furthermore, the selection of lubricating oil plays a critical role, as the optimal oil formulation significantly enhances tool life and overall machining efficiency.
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