Advances in Manufacturing ›› 2021, Vol. 9 ›› Issue (4): 483-495.doi: 10.1007/s40436-021-00368-9

• ARTICLES •    

A novel method for workpiece deformation prediction by amending initial residual stress based on SVR-GA

Jiang Guo1, Bin Wang1, Zeng-Xu He1, Bo Pan1, Dong-Xing Du2, Wen Huang2, Ren-Ke Kang1   

  1. 1 Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, People's Republic of China;
    2 Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621999, Sichuan, People's Republic of China
  • Received:2021-01-05 Revised:2021-04-30 Published:2021-11-12
  • Contact: Jiang Guo, Ren-Ke E-mail:guojiang@dlut.edu.cn;Kang kangrk@dlut.edu.cn
  • Supported by:
    The authors acknowledge the financial support provided by the National Key Research and Development Program (Grant No. 2018YFA0702900), the Science Challenge Project (Grant No. TZ2016006), and the National Natural Science Foundation of China (Grant No. 51975096).

Abstract: High-precision manufactured thin-walled pure copper components are widely adopted in precision physics experiments, which require workpieces with extremely high machining accuracy. Double-sided lapping is an ultraprecision machining method for obtaining high-precision surfaces. However, during double-sided lapping, the residual stress of the components tends to cause deformation, which affects the machining accuracy of the workpiece. Therefore, a model to predict workpiece deformation derived from residual stress in actual manufacturing should be established. To improve the accuracy of the prediction model, a novel method for predicting workpiece deformation by amending the initial residual stress slightly based on the support vector regression (SVR) and genetic algorithm (GA) is proposed. Firstly, a finite element method model is established for double-sided lapping to understand the deformation process. Subsequently, the SVR model is utilized to construct the relationship between residual stress and deformation. Next, the GA is used to determine the best residual stress adjustment value based on the actual deformation of the workpiece. Finally, the method is validated via double-sided lapping experiments.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-021-00368-9

Key words: Initial residual stress, Double-sided lapping, Support vector regression (SVR), Genetic algorithm (GA), Deformation