Abstract Significant cutting temperature rise is induced in dry machining Inconel 718 with high cutting speed due to its low thermal conductivity and high hot hardness. PVD AlTiN coating can avoid direct contact between tool substrate and moving chip, which will affect tool-chip interface heat partition and temperature rise. However, few studies were relevant with the effect of AlTiN coating on tool-chip interface heat partition and temperature rise in dry cutting Inconel 718. In this study, the tool-chip interface temperature rises due to heat generations in primary and secondary deformation zones (PDZ and SDZ) are predicted with various heat partition coefficients, respectively. The cutting temperatures measured by two-color thermometer are utilized to determine the heat partition coefficient, and to verify the proposed interface temperature predictive model for dry orthogonal cutting Inconel 718 at cutting speed 40, 80 and 120 m/min with uncoated and PVD AlTiN coated tools. It is found that AlTiN coating decreases crater wear, and tool-chip contact length compared with that using uncoated tool. AlTiN coating decreases the maximum tool-chip interface temperature 39.00 °C and 5.47% compared with that using uncoated tool at 120 m/min. Heat partition model RG-W and RR was suitable for temperature prediction with least summary relative errors in cutting Inconel 718 with uncoated and AlTiN coated tools. The results illustrate that the PVD AlTiN coated tool could be beneficial in high-speed dry cutting Inconel 718 due to its less tool-chip interface temperature rises and tool crater wear.

中文翻译：

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PVD AlTiN涂层对正交切削Inconel 718刀具-切屑热分配系数和切削温升的影响

摘要 Inconel 718 热导率低、热硬性高，切削速度快，干式加工导致切削温度显着升高。PVD AlTiN涂层可避免刀具基体与移动切屑直接接触，影响刀具-切屑界面热分配和温升。然而，很少有研究涉及AlTiN涂层对干切削Inconel 718刀具-切屑界面热分配和温升的影响。在本研究中，刀具-切屑界面温度升高是由于一次和二次变形区的热量产生（ PDZ 和 SDZ) 分别用各种热分配系数进行预测。利用双色温度计测量的切削温度来确定热分配系数，并验证所提出的界面温度预测模型，用于使用未涂层和 PVD ​​AlTiN 涂层刀具以 40、80 和 120 m/min 的切削速度干式正交切削 Inconel 718。结果表明，与使用未涂层刀具相比，AlTiN 涂层减少了月牙洼磨损和刀具-切屑接触长度。与使用未涂层刀具以 120 m/min 的速度相比，AlTiN 涂层使刀具-切屑界面的最高温度降低了 39.00 °C 和 5.47%。热分配模型 RG-W 和 RR 适用于温度预测，在使用未涂层和 AlTiN 涂层刀具切削 Inconel 718 时，总相对误差最小。结果表明，PVD AlTiN 涂层刀具可能有利于高速干切削 Inconel 718，因为其刀具-切屑界面温升和刀具凹坑磨损较少。