Intelligent Recognition Model of Hot Rolling Strip Edge Defects Based on Deep Learning

• Main Authors: Dongcheng Wang, Yanghuan Xu, Bowei Duan, Yongmei Wang, Mingming Song, Huaxin Yu, Hongmin Liu
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Series: Metals
• Subjects: hot rolling strip; edge defects; intelligent recognition; convolutional neural networks
• Online Access: https://www.mdpi.com/2075-4701/11/2/223

The edge of a hot rolling strip corresponds to the area where surface defects often occur. The morphologies of several common edge defects are similar to one another, thereby leading to easy error detection. To improve the detection accuracy of edge defects, the authors of this paper first classified the common edge defects and then made a dataset of edge defect images on this basis. Subsequently, edge defect recognition models were established on the basis of LeNet-5, AlexNet, and VggNet-16 by using a convolutional neural network as the core. Through multiple groups of training and recognition experiments, the model’s accuracy and recognition time of a single defect image were analyzed and compared with recognition models with different learning rates and sample batches. The experimental results showed that the recognition model based on the AlexNet had a maximum accuracy of 93.5%, and the average recognition time of a single defect image was 0.0035 s, which could meet the industry requirement. The research results in this paper provide a new method and thought for the fine detection of edge defects in hot rolling strips and have practical significance for improving the surface quality of hot rolling strips.