Abstract

In this work, machining performance of Ti-6Al-4V is studied in consideration with cutting force, tool-tip temperature, tool wear mechanisms, chip morphology and roughness of the machined surface. Machining experiments are carried out by varying cutting speed (Vc) with constant feed and depth-of-cut. Uncoated WC-Co insert is used as cutting tool. Multi-walled carbon nanotubes (MWCNTs) added rice bran oil is utilized to produce nanofluid minimum quantity lubrication (MQL) environment. Chip morphology along with measurable geometrical parameters including chip-tool contact length, equivalent chip thickness (H_ch), segmentation spacing, segmentation frequency, shear band width, shear angle, chip hardness, etc. are studied in detail. Effects of Vc on cutting force, tool-tip temperature, depth of flank wear, and area of crater wear are discussed. Different tool wear mechanisms are identified as well. It is experienced that nanofluid MQL (NFMQL) outperforms traditional dry cutting as well as conventional MQL in purview of improved process performance.

抽象的

在这项工作中，研究Ti-6Al-4V的加工性能时要考虑切削力，刀尖温度，刀具磨损机理，切屑形态和加工表面的粗糙度。通过以恒定的进给量和切削深度改变切削速度（Vc）来进行机加工实验。未涂层的WC-Co刀片用作切削工具。添加米糠油的多壁碳纳米管（MWCNT）用于产生纳米流体最小量润滑（MQL）环境。切屑形态以及可测量的几何参数，包括切屑工具接触长度，等效切屑厚度（H _ch），细分间距，细分频率，剪切带宽度，剪切角，切屑硬度等详细信息。讨论了Vc对切削力，刀尖温度，后刀面磨损深度和月牙洼磨损面积的影响。还确定了不同的工具磨损机制。经验表明，就改善工艺性能而言，纳米流体MQL（NFMQL）优于传统的干切削和传统的MQL。