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Modeling and Application of Deformation Resistance Model for Medium and Heavy Plate Based on Machine Learning |
JI Xiumei1,2, HOU Meiling2, WANG Long1(), LIU Jie1, GAO Kewei2 |
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China 2 Jiangyin Xingcheng Special Steel Co. Ltd., Jiangyin 214400, China |
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Cite this article:
JI Xiumei, HOU Meiling, WANG Long, LIU Jie, GAO Kewei. Modeling and Application of Deformation Resistance Model for Medium and Heavy Plate Based on Machine Learning. Acta Metall Sin, 2023, 59(3): 435-446.
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Abstract Based on the actual production data of the plate mill of Xingcheng Special Steel, two machine learning methods for predicting deformation resistance are proposed to improve prediction accuracy. The first is a multi-steel deformation resistance model and modeling method that is combined with an extreme learning machine (ELM) and a traditional mathematical model, and the second is a deformation resistance model and modeling method that is based on the TensorFlow deep learning framework. Method one: The structural form of the original deformation resistance model was improved by referring to the Zhou Jihua-Guan Kezhi deformation resistance model, and the reference deformation resistances of representative steel grades of low alloy steel, alloy steel, and high alloy steel were calculated. The influence coefficient of deformation parameters independent of steel grade was calculated using nonlinear regression. The ELM neural network algorithm was presented, and neural network parameters were optimized using grey correlation analysis and cross-validation. To reduce the residual error of ELM prediction, the prediction results were smoothed using linear interpolation and then combined with the traditional mathematical model to obtain the deformation resistance. Method two: Based on deep learning technology, two types of deep neural networks with different structures were built and combined with the mechanism. To improve the generalizability and stability of the model, the mini-batch and RMSprop optimization algorithms were used in conjunction with batch normalization (BN) and early stopping regularization strategies. Finally, deformation resistance prediction models for roughing mill (RM) and finishing mill (FM) were developed respectively in conjunction with the process characteristics to improve model accuracy. The results showed that the deformation resistance prediction using deep learning has high prediction accuracy. Offline analysis indicated that the mean absolute percentage error decreased from 9.27% of the original model to an average of 2.59%. The online application demonstrated that the ratio of rolling force prediction accuracy within 10% relative error increased from 72.31% to an average of 90.24%, raising the technological level of onsite production.
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Received: 12 July 2021
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About author: WANG Long, senior engineer, Tel: 18616377700, E-mail: longwang@shu.edu.cn
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