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New Compound Drill Bit for Damage Reduction in Drilling CFRP

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International Journal of Precision Engineering and Manufacturing-Green Technology Aims and scope Submit manuscript

Abstract

This paper focuses on finding a suitable drill bit for drilling Carbon Fiber Reinforced Plastic (CFRP). The drilling characteristics of the dagger drill, the double point angle drill, and the candle stick drill are studied. The results show that the side edge has poor ability to remove burrs, and the tip structure of the outer corner of the candle stick drill can greatly reduce the entry damage. However, the outer corner small tip structure of the candle stick drill cannot effectively remove the uncut fiber around θ = 0° of hole exit. The long secondary cutting edge of the dagger drill makes a small thrust force at the drilling exit stage and reduces the dropping speed of the thrust force, leading a lower impact on the laminate bottom. Then, a new tool is developed for drilling CFRP based on the advantages of the three kinds of drill bits. The drill has a long secondary cutting edge, a small tip diameter and a small tip structure of the outer corner. And its drilling characteristics are analyzed. The result shows that the new compound drill bit can effectively remove fibers and reduce thrust force at the drilling exit stage, form burr-free and small delamination hole. The drill reduces the waste of CFRP in manufacturing process since the exit damage is reduced substantially, which is in line with the concept of green manufacturing.

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Abbreviations

θ :

The angle between the cutting speed and the fiber direction

β :

Helix angel

Fd:

Delamination factor

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Acknowledgement

The work is supported by the National Natural Science Foundation of China (Nos. 51775184, 51275168 and 51605161).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Xinyi Qiu, Pengnan Li, Changping Li, Qiulin Niu, Puren Ouyang & Tae Jo Ko

  2. Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan, 411201, China

    Anhua Chen

  3. School of Mechanical Engineering, Yeungnam University, 280, Daehak-ro, Gyoungsan-si, Gyeongsangbuk-do, 38541, Republic of Korea

    Tae Jo Ko

Authors
  1. Xinyi Qiu
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  2. Pengnan Li
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  3. Changping Li
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  4. Qiulin Niu
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  5. Anhua Chen
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  6. Puren Ouyang
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  7. Tae Jo Ko
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Correspondence to Pengnan Li.

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Qiu, X., Li, P., Li, C. et al. New Compound Drill Bit for Damage Reduction in Drilling CFRP. Int. J. of Precis. Eng. and Manuf.-Green Tech. 6, 75–87 (2019). https://doi.org/10.1007/s40684-019-00026-3

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  • DOI: https://doi.org/10.1007/s40684-019-00026-3

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