ABSTRACT

Inconel 718 superalloys are known materials with high applicability to components that demand exceptional chemical and mechanical properties at higher working temperatures combined with excellent surface finish requirements. However, due to the lack of in-depth knowledge regarding its machining process, the material is considered a difficult-to-machine material. Therefore, to improve the machining process of the Inconel 718 superalloy, by finding the optimal processing conditions, it was necessary to analyze the influence of the cutting parameters on the workpiece surface quality. In this work, the evaluation of quality indicators was made through the influence analysis of cutting speed, feed, tool, and lubrication parameters. The surface roughness (R_a, R_t), consumed power, vibration, and tool wear indicators were evaluated by following a Taguchi experimental design. To perform the machining process, the tool CNMG120408-M1 coating TS2500 with minimum quantity of lubricant was used. Results have proven that feed rate adjusted to 0.10 mm/rev and the cutting speed of 70 m/min provided the optimal processing results. It was observed that the feed increase led to an increase of all indicators. Consumed power denoted high sensibility concerning the machining parameters, suggesting its potential use in tool wear prediction studies applied for the Inconel 718 machining.

摘要

Inconel 718 高温合金是已知的材料，非常适用于需要在较高工作温度下具有出色化学和机械性能以及出色的表面光洁度要求的部件。然而，由于缺乏对其加工过程的深入了解，该材料被认为是一种难以加工的材料。因此，为改进Inconel 718高温合金的加工工艺，需要通过寻找最佳加工条件，分析切削参数对工件表面质量的影响。本工作通过切削速度、进给量、刀具、润滑参数的影响分析，对质量指标进行评价。表面粗糙度（R _a , R _t)、消耗功率、振动和工具磨损指标通过遵循田口实验设计进行评估。为了执行加工过程，使用了带有最少润滑剂量的工具 CNMG120408-​​M1 涂层 TS2500。结果证明，将进给速度调整为 0.10 mm/rev 和 70 m/min 的切削速度提供了最佳加工效果。据观察，饲料的增加导致所有指标的增加。消耗的功率表示对加工参数的高度敏感性，表明其在应用于 Inconel 718 加工的刀具磨损预测研究中的潜在用途。