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Impact of Process Parameters on the Quality of Deep Holes Drilled in Inconel 718 Using EDD

机译：EDD工艺参数对Inconel 718中深孔质量的影响

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Advanced engineering materials (e.g., nickel or titanium alloy) are being increasingly applied to produce parts of gas turbines in the aerospace industry. To improve the durability of these parts, many holes, with a length-to-diameter aspect ratio greater than 20:1, are created in their structure. The quality of the holes significantly affects the cooling process of the elements. However, it is challenging to machine materials by conventional methods. When machining a hole with a high aspect ratio, the major problem is effective flushing of the machining area, which can improve the hole’s surface integrity and dimensional accuracy. Consequently, the electro-discharge drilling (EDD) process is good alternative for this application. This paper presents the results of an analysis of the EDD of Inconel 718 alloy. An experiment was conducted to evaluate the impact of process parameters (pulse time, current amplitude, and discharge voltage) on the process’s performance (linear tool wear, taper angle, drilling speed, the hole’s aspect ratio, and surface roughness (Ra and Rz)). The results show that EDD provides us with the possibility to drill holes with an aspect ratio greater than 10:1. The results also demonstrate that holes with an aspect ratio greater than 10:1 and a small taper angle value have a significantly decreased quality of internal surface, especially at the bottom of the hole. This indicates that an insufficient amount of debris is removed from the bottom of the hole.
机译：先进的工程材料（例如镍或钛合金）正越来越多地用于制造航空航天业中的燃气轮机零件。为了提高这些零件的耐用性，在其结构上创建了许多长径比大于20：1的孔。孔的质量会显着影响元件的冷却过程。然而，通过常规方法加工材料是具有挑战性的。在加工高深宽比的孔时，主要问题是有效冲洗加工区域，这可以提高孔的表面完整性和尺寸精度。因此，对于这种应用，放电钻孔（EDD）工艺是很好的选择。本文介绍了Inconel 718合金的EDD分析结果。进行了一项实验，以评估工艺参数（脉冲时间，电流幅度和放电电压）对工艺性能（线性刀具磨损，锥角，钻孔速度，孔的长宽比和表面粗糙度（Ra和Rz））的影响）。结果表明，EDD使我们可以钻出纵横比大于10：1的孔。结果还表明，长径比大于10：1且锥角值较小的孔的内表面质量明显下降，尤其是在孔的底部。这表明从孔的底部清除了不足量的碎屑。

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