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Influence mechanism of multi-factor on the diameter of the stepped hole in the drilling of CFRP/Ti stacks

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Abstract

After drilling on CFRP/Ti stacks in one-shot time, there are significant differences in hole diameter measured in CFRP and titanium alloy. This machining problem referred to as a stepped hole seriously affects the service performance of CFRP/Ti stacks. In this paper, to clear the formation mechanism of the stepped hole, drilling experiments on CFRP/Ti stacks have been carried out to investigate the influence mechanism of tool vibration, cutting heat, cutting chip, and tool wear on the hole diameter in CFRP and titanium alloy. The experimental results show that when CFRP plate is arranged on top of stacks material, the hole diameter in CFRP is generally larger than that in titanium alloy. The main reasons causing the enlargement of hole diameter in CFRP are that the tool vibration at the interface of stacks material and the hot and sharp chip of titanium alloy. Also, the hole diameter in CFRP also enlarges with an increase of cutting heat. Moreover, when the changes of thickness of titanium alloy coating in the drill, the hole diameter in CFRP and titanium alloy continually change.

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Acknowledgements

The authors would like to acknowledge the editors and the anonymous referees for their insightful comments.

Funding

The work reported here is sponsored by the National Commercial Aircraft Manufacturing Engineering Technology Research Center Innovation Foundation (COMAC-SFGS-2019-341), the Aeronautical Science Foundation of China (2017ZE52052), and the National Natural Science Foundation of China (51605221, 51875283).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Zhenchao Qi, Jinglan Yang, Fengchen Li & Shaofeng Jin

  2. Institute of Aeronautical Manufacturing Technology, Shanghai Aircraft Manufacturing Co., Ltd., Shanghai, 201324, China

    Ende Ge

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  1. Zhenchao Qi
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  2. Ende Ge
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  3. Jinglan Yang
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  4. Fengchen Li
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Contributions

(1) Zhenchao Qi designed the study, performed the research, analysis data, and wrote the paper.

(2) Ende Ge provided experimental condition and directed experiments.

(3) Jinglan Yang conducted experiments and data processing.

(3) Fengchen Li and Shaofeng Jin modified the paper.

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Correspondence to Zhenchao Qi.

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Qi, Z., Ge, E., Yang, J. et al. Influence mechanism of multi-factor on the diameter of the stepped hole in the drilling of CFRP/Ti stacks. Int J Adv Manuf Technol 113, 923–933 (2021). https://doi.org/10.1007/s00170-021-06678-3

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  • DOI: https://doi.org/10.1007/s00170-021-06678-3

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