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Tool condition monitoring based on the fractal analysis of current and cutting force signals during CFRP trimming

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Abstract

Carbon fiber–reinforced plastic (CFRP) is becoming more popular in the aerospace industry due to its high strength-to-weight ratio and low weight. Machining CFRP to achieve the required surface quality, on the other hand, remains a challenge. High temperature in the cutting zone area affects the tool life and surface quality of the machined part. A thermally affected matrix makes an inaccurate interpretation of the surface quality. Then, the roughness parameters cannot be an appropriate indicator for surface evaluation of the CFRP. In the aerospace industry, however, ensuring the acceptable surface quality of a part is essential. Minimizing and controlling tool wear are necessary to avoid degrading the finished surface and losing the dimensional accuracy of the final part. Early detection of tool wear and appropriate surface quality in finishing operations can be achieved using online tool condition monitoring. Cutting forces and electric current signals related to the spindle during machining are very responsive to cutting conditions and can accurately represent tool condition changes. Fractal analysis, as a new approach in the online tool condition monitoring, can assess the tool condition during machining. This research investigates the fractal analysis of the spindle electric current signal and the total cutting force signal while trimming CFRP using a CVD end mill through three different tool life conditions, e.g. new tool, moderately worn tool, and severely worn tool. The empirical fractal index is also introduced to assess the tool condition and ensure the acceptable surface qualities in the finishing operations. The effectiveness of fractal analysis as a decision-making method in the tool condition monitoring was successfully proven in this study.

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Authors and Affiliations

  1. Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Québec, Canada

    Maryam Jamshidi, Jean-François Chatelain & Xavier Rimpault

  2. Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Québec, Canada

    Marek Balazinski

Authors
  1. Maryam Jamshidi
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  2. Jean-François Chatelain
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  3. Xavier Rimpault
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  4. Marek Balazinski
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Correspondence to Maryam Jamshidi.

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Jamshidi, M., Chatelain, JF., Rimpault, X. et al. Tool condition monitoring based on the fractal analysis of current and cutting force signals during CFRP trimming. Int J Adv Manuf Technol 121, 8127–8142 (2022). https://doi.org/10.1007/s00170-022-09860-3

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  • DOI: https://doi.org/10.1007/s00170-022-09860-3

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