The DD6 nickel-based superalloy exhibits remarkably high temperature properties; therefore, it is employed as a crucial structural material in the aviation industry. Nevertheless, this material is difficult to process. Ultrasonic-assisted drilling (UAD) combines the characteristics of vibration processing technology and conventional drilling technology, significantly improving the machinability of difficult-to-machine materials. Thus, UAD experiments were performed on micro-hole machining of DD6 superalloy in this study. The effects of amplitude, frequency, spindle speed, and feed rate on thrust force, machining quality, and drill bit wear were studied; thereafter, a comparison was drawn between these effects and those of conventional drilling (CD). The experimental results reveal that the thrust force decreases with an increase in spindle speed or a decrease in feed rate for both UAD and CD. UAD can significantly reduce the thrust force. With the same processing parameters, the greater the amplitude, the greater the reduction of the thrust force. The surface roughness of the hole wall produced by UAD is lower than that of CD. Compared with CD, UAD reduces the burr height, improves machining accuracy, and reduces drill bit wear.

中文翻译：

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DD6合金微孔加工中的超声辅助钻孔研究

DD6镍基高温合金具有极高的高温性能；因此，它被用作航空业的关键结构材料。然而，这种材料难以加工。超声辅助钻孔（UAD）结合了振动处理技术和常规钻孔技术的特点，显着提高了难加工材料的可加工性。因此，在本研究中，对DD6合金的微孔加工进行了UAD实验。研究了振幅，频率，主轴转速和进给速率对推力，加工质量和钻头磨损的影响；之后，将这些效果与常规钻孔（CD）进行了比较。实验结果表明，对于UAD和CD，推力随着主轴转速的增加或进给速度的降低而减小。UAD可以大大降低推力。在相同的加工参数下，振幅越大，推力的减小越大。UAD产生的孔壁的表面粗糙度低于CD。与CD相比，UAD降低了毛刺高度，提高了加工精度，并减少了钻头磨损。