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Towards understanding the thermal characteristics of thermoplastic CF/PEEK composite drilling: heat transfer mechanism, crystallinity, and hole making performance

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Abstract

Remelting and remolding characteristics of thermoplastic resin make the carbon fiber-reinforced polyether-ether-ketone (CF/PEEK) composite process unique recyclability and reusability, while thermal characteristics play the crucial mechanism. This paper presents a comprehensive investigation on thermal characteristics of CF/PEEK drilling in terms of the heat transfer mechanism, crystallinity, and hole making performance. Crystallinity is introduced to quantitatively evaluate the change of material performance for CF/PEEK drilling where the crystallinity is positively correlated with tensile strength. Parameter analysis shows that the increased spindle speed leads to the increase of drilling temperature, crystallinity, and slightly deduces the tensile strength of CF/PEEK. The heat transfer curve of CF/PEEK drilling was first obtained and it is found that the heat transfer experiences three stages, namely steady rising, slow falling, and fast falling stage. Crystallinity comparative analysis between the hole wall and chips reveal that heat transfer effect dramatically affects the crystallinity when the drilling temperature exceeds the glass transition temperature (142 °C). Further, high temperature-induced PEEK smearing effect reduces the fiber exposure and surface roughness of hole wall but increases the crack appearance. The work provides important guidance for the high quality drilling of CF/PEEK composites from the point of view of the thermal characteristics.

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Acknowledgements

We would like to thank the Analytical & Testing Center of Tiangong University for structured illumination microscopy work.

Funding

This work was supported by the National Natural Science Foundation of China (No. 51705362), the Tianjin Science and Technology Planning Project (No. 22YDTPJC00110), the Tianjin 131 Research Team of Innovative Talents (No. 201916), and the Tianjin Research Innovation Project for Postgraduate Students (No. 2021YJSB233).

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Authors and Affiliations

  1. Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, School of Mechanical Engineering, Tiangong University, Tianjin, 300387, China

    Wenhui Yuan, Tao Yang, Chang Liu, Yu Du & Lei Gao

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  1. Wenhui Yuan
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  2. Tao Yang
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  3. Chang Liu
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Contributions

Wenhui Yuan: investigation, methodology, experiments, writing — original draft, writing — review and editing; Tao Yang: methodology, validation, writing — review and editing; Chang Liu: investigation, methodology, experimental data analysis, validation, writing — review and editing; Yu Du: writing — review and editing; Lei Gao: investigation, methodology, experiments.

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Correspondence to Tao Yang or Chang Liu.

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Yuan, W., Yang, T., Liu, C. et al. Towards understanding the thermal characteristics of thermoplastic CF/PEEK composite drilling: heat transfer mechanism, crystallinity, and hole making performance. Int J Adv Manuf Technol 130, 1075–1092 (2024). https://doi.org/10.1007/s00170-023-12741-y

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