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Shrinkage during solidification of complex structure castings based on convolutional neural network deformation prediction research


In the investment casting process of castings with complex structures, due to shrinkage deformation, the casting accuracy and pass rate are low, which largely limits the application scope. In this study, a convolutional neural network (CNN) was used to predict and analyze the shrinkage deformation of complex castings in a investment casting process, which provides a new method to improve the precision of investment casting and cavity design. Through the establishment of a hollow thin-walled structure model, simulation calculations, mathematical modeling, and nonlinear fitting analyses of the shrinkage rate were performed, and a mapping model between the shrinkage rate and the structural parameters was constructed. The CNN model was constructed based on the structural characteristics of the model. Finally, experimental verification was carried out to analyze actual hollow turbine blades. The average error for the training set was 0.04%, and the average error for the test set was 0.03%. The experimental results showed that the CNN model proposed in this paper could accurately predict the shrinkage deformation and trends of complex castings in the investment casting process, which has important practical significance for improving the accuracy of castings and mold cavity design.

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This research was partially sponsored by the National Natural, Science Foundation of China (Grant Number 51705440), the Natural Science Foundation of Fujian Province, China (Grant Number 2019J01044), and the National Science and Technology Major Project of China (Nos. J2019-III-0008, J2019-VII-0013-0153).

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Correspondence to Yiwei Dong.

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Author contribution

Xiang Guo: methodology, software, validation, writing—original draft. Yiwei Dong: conceptualization, writing—review and editing. Qianwen Ye: software, numerical simulation. Weiguo Yan: experimental design.

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Dong, Y., Guo, X., Ye, Q. et al. Shrinkage during solidification of complex structure castings based on convolutional neural network deformation prediction research. Int J Adv Manuf Technol (2021).

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  • Investment casting
  • Shrinkage deformation
  • Convolutional neural network
  • Predictive analysis