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<p>In order to study the influence of drill bit structure on the hole quality, this article conducts experimental research on hole quality of three types of drill bit for CFRP pipes drilling using a one-time penetration drilling method. Firstly, the impact of cutting force produced by cutting off fibers by obtuse and acute angle structures at the outer corner on the formation of processing damage is theoretically analyzed. Then, the maximum thrust force and hole quality (hole entry damage, burrs, hole exit delamination, and other defects) after drilling CFRP pipes with double point angle drills, stepped drills, and reverse edge compound drills are comparatively analyzed through experiments. The results indicate that the outer edge angle structure of the drill bit has a significant impact on the drilling quality of CFRP pipes. Compared to the double point angle drill, the average maximum thrust force generated by stepped drill and the reverse edge compound drill is reduced by 47% and 56.1% in CFRP pipe drilling process, respectively. In convex drilling, the hole exit delamination factor after drilling of the double point angle drill is the largest; the smallest delamination factor is produced by the reverse edge compound drill. In concave drilling, the reverse edge compound drill and double point angle drill produce a relatively small delamination factor. Therefore, compared to double point angle drills and step drills with obtuse angle structures at the outer corner, the reverse edge compound drills with acute angle structures at the outer corner are more suitable for drilling CFRP pipes.</p>

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Influence of drill structure on the hole quality of CFRP pipes

  • 期刊论文

  • 发表日期：

    2025年2月8日

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  • Xinyi Qiu,
  • Lintao Xiang,
  • Lingyan Tang,
  • Pengnan Li,
  • Changping Li,
  • Shujian Li,
  • Siwen Tang,
  • Tae Jo Ko

摘要

In order to study the influence of drill bit structure on the hole quality, this article conducts experimental research on hole quality of three types of drill bit for CFRP pipes drilling using a one-time penetration drilling method. Firstly, the impact of cutting force produced by cutting off fibers by obtuse and acute angle structures at the outer corner on the formation of processing damage is theoretically analyzed. Then, the maximum thrust force and hole quality (hole entry damage, burrs, hole exit delamination, and other defects) after drilling CFRP pipes with double point angle drills, stepped drills, and reverse edge compound drills are comparatively analyzed through experiments. The results indicate that the outer edge angle structure of the drill bit has a significant impact on the drilling quality of CFRP pipes. Compared to the double point angle drill, the average maximum thrust force generated by stepped drill and the reverse edge compound drill is reduced by 47% and 56.1% in CFRP pipe drilling process, respectively. In convex drilling, the hole exit delamination factor after drilling of the double point angle drill is the largest; the smallest delamination factor is produced by the reverse edge compound drill. In concave drilling, the reverse edge compound drill and double point angle drill produce a relatively small delamination factor. Therefore, compared to double point angle drills and step drills with obtuse angle structures at the outer corner, the reverse edge compound drills with acute angle structures at the outer corner are more suitable for drilling CFRP pipes.