ABSTRACT

In this work, the effect of High-Speed Milling (HSM) on Average Surface Roughness (Ra), Maximum Profile Height (Rz), Hardness (H), Young’s Modulus (E) and microstructure have been investigated. HSM with the range of 125–226 m/min is employed to reveal its impact on the machinability of Ti-6Al-7Nb alloy for biomedical application. Effects of Cutting Speed(v_c), Feed per Tooth (f_z) and Cutting Depth (a_p) on ‘Ra’, ‘Rz’, ‘H’ and ‘E’ were examined under diverse milling conditions. Inferences made from the experimental studies reveal that Ra of 0.3 µm can be obtained from the chosen machining variables: v_c = 226 m/min, a_p = 80 µm and f_z = 0.03 µm/tooth. The corresponding ‘H’ and ‘E’ values were found to be 2.3 and 18.1 GPa respectively. Microstructural analysis indicates that grooves formation and chip redeposition are the governing factors for ‘Ra’. The experimental results signify that the HSM with high ‘v_c’ leads to the increase of ‘H’ and reduction of ‘E’ values thereby enhancing the biocompatibility of Ti-6Al-7Nb alloy.

摘要

在这项工作中，研究了高速铣削 (HSM) 对平均表面粗糙度 (Ra)、最大轮廓高度 (Rz)、硬度 (H)、杨氏模量 (E) 和微观结构的影响。采用 125–226 m/min 范围内的 HSM 来揭示其对生物医学应用中 Ti-6Al-7Nb 合金可加工性的影响。在不同的铣削条件下，研究了切削速度 (v _c )、每齿进给量 (f _z ) 和切削深度 ( ap )_{对“Ra”、“Rz”、“H”和“E”的影响。}从实验研究中得出的推论表明，可以从选择的加工变量中获得 0.3 µm 的 Ra：v _c  = 226 m/min，a _p  = 80 µm 和 f _z = 0.03 µm/齿。发现相应的“H”和“E”值分别为 2.3 和 18.1 GPa。微观结构分析表明，凹槽形成和切屑再沉积是“Ra”的控制因素。实验结果表明，高'v _c '的HSM导致'H'值的增加和'E'值的降低，从而提高了Ti-6Al-7Nb合金的生物相容性。