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Article

MaskLenNet: A Query-Based Instance Segmentation and Length Prediction Network for Quantitative Industrial Tool Wear and Breakage Assessment

1
China National Petroleum Corporation Engineering Technology Research and Development Company Limited, Beijing 102200, China
2
Department of Data Science, College of Computing, City University of Hong Kong, Kowloon, Hong Kong
3
City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China
4
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
J. Manuf. Mater. Process. 2026, 10(8), 286; https://doi.org/10.3390/jmmp10080286
Submission received: 3 July 2026 / Revised: 4 August 2026 / Accepted: 5 August 2026 / Published: 6 August 2026

Abstract

Tool wear detection is essential for machining quality control and predictive maintenance, but conventional inspection is often manual, time-consuming, and operator-dependent. Existing learning-based visual methods still face challenges in jointly achieving reliable wear-type recognition, accurate wear-region localization, and quantitative wear-width measurement under shop-floor imaging conditions. To address these issues, this study proposes MaskLenNet, a query-based instance segmentation and length prediction network for solid carbide end-milling tool diagnosis. MaskLenNet combines a Swin Transformer backbone, query-based instance-mask prediction, wear-oriented attention, and a key-point head that directly estimates the maximum wear-land width (VB). Evaluation uses 234 images from 54 physical tools under a tool-disjoint split, so different rotations of one tool cannot occur in both training and evaluation sets. On the held-out test set, MaskLenNet achieves 96.52% matched-instance classification accuracy, 95.75% foreground instance mIoU, and a VB mean absolute error of 0.010214 mm. Relative to BEiT-Base, the gains are 3.04 and 3.60 percentage points in accuracy and mIoU, respectively. These results demonstrate promising performance within the evaluated acquisition system; they do not establish equivalence to microscopy or generalization to other machines, optics, workpiece materials, or sites.
Keywords: tool wear detection; multi-task learning; quantitative wear measurement; channel and spatial attention; predictive maintenance tool wear detection; multi-task learning; quantitative wear measurement; channel and spatial attention; predictive maintenance

Share and Cite

MDPI and ACS Style

Pan, Y.; He, K.; Yin, C.; Zhang, Y.; Luo, Y.; Wang, Y. MaskLenNet: A Query-Based Instance Segmentation and Length Prediction Network for Quantitative Industrial Tool Wear and Breakage Assessment. J. Manuf. Mater. Process. 2026, 10, 286. https://doi.org/10.3390/jmmp10080286

AMA Style

Pan Y, He K, Yin C, Zhang Y, Luo Y, Wang Y. MaskLenNet: A Query-Based Instance Segmentation and Length Prediction Network for Quantitative Industrial Tool Wear and Breakage Assessment. Journal of Manufacturing and Materials Processing. 2026; 10(8):286. https://doi.org/10.3390/jmmp10080286

Chicago/Turabian Style

Pan, Yi, Kun He, Chen Yin, Yanping Zhang, Yong Luo, and Yulin Wang. 2026. "MaskLenNet: A Query-Based Instance Segmentation and Length Prediction Network for Quantitative Industrial Tool Wear and Breakage Assessment" Journal of Manufacturing and Materials Processing 10, no. 8: 286. https://doi.org/10.3390/jmmp10080286

APA Style

Pan, Y., He, K., Yin, C., Zhang, Y., Luo, Y., & Wang, Y. (2026). MaskLenNet: A Query-Based Instance Segmentation and Length Prediction Network for Quantitative Industrial Tool Wear and Breakage Assessment. Journal of Manufacturing and Materials Processing, 10(8), 286. https://doi.org/10.3390/jmmp10080286

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