Abstract
γ-TiAl alloy is a typically difficult material to machine, with common machining defects such as grain pull-out and material spalling during machining, resulting in component scrap. As a result, it is critical to investigate the monitoring method of surface roughness during milling. A new model for predicting surface roughness is proposed in this paper. The prediction problem of surface roughness is turned into a classification problem based on deep learning. The features of the force signal are extracted using a continuous wavelet transform, and the one-dimensional signal is converted into a two-dimensional time–frequency diagram to obtain additional information. The transfer learning mechanism is introduced to make the model faster and improve prediction accuracy. The overfitting problem is solved, and the model’s generalization ability is improved through batch normalization and a dropout layer. The results show that the method has high recognition accuracy, with a maximum classification accuracy of 98% and an average accuracy of 96.12%, i.e., a 10.52% improvement over the traditional model, allowing it to accurately realize monitoring of surface quality in milling processing.
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This work was supported by the National Natural Science Foundation of China (52175416, 51775280) and Science Center for Gas Turbine Project (P2022-A-IV-001–003).
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Wu, Y., Liu, L., Huang, L. et al. A monitoring method for surface roughness of γ-TiAl alloy based on deep learning of time–frequency diagram. Int J Adv Manuf Technol 129, 2989–3007 (2023). https://doi.org/10.1007/s00170-023-12453-3
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DOI: https://doi.org/10.1007/s00170-023-12453-3