High frequency printed circuit board (PCB), as the significant support for 5G technology, has been receiving intense attention from the increasing number of scholars. Concerning precision fabrication of high frequency PCBs, micro hole drilling is deemed as one of the extremely crucial challenges. In this study, the coated drill bits’ wear and micro hole quality were investigated through the drilling experiments of high frequency PCBs. Results showed that two kinds of coated drill bits exhibited well in terms of hole registration accuracy. Using diamond like carbon coated drill bits could obtain fewer burrs than drilled with diamond coated drill bits before drilling 200 holes, but the burr height increased very slowly with the increment of hole number when using diamond coated drill bits. Taking the combination of aluminum sheet and phenolic aldehyde board as the entry board was conducive to obtaining less burr, and the micro drill bits with helix angles of 40 and 42 were contributed to achieving less burr too. Additionally, decreasing the feed rate could lessen the hole blocking.

高频印刷电路板（PCB）作为5G技术的重要支撑，受到越来越多学者的关注。关于高频PCB的精密制造，微孔钻孔被认为是极其关键的挑战之一。本研究通过高频PCB的钻孔实验研究了涂层钻头的磨损和微孔质量。结果表明，两种涂层钻头在孔对位精度方面表现良好。在钻200个孔之前，使用类金刚石碳涂层钻头比使用金刚石涂层钻头钻出的毛刺更少，但使用金刚石涂层钻头时，毛刺高度随着孔数的增加而增加非常缓慢。以铝板和酚醛板组合作为入口板有利于获得更少的毛刺，40和42螺旋角的微型钻头也有助于获得更少的毛刺。此外，降低进给速度可以减少孔阻塞。