Modeling of Piercing Based on DEFORM-3D and the Ensemble OSC-PLS-ELM Method

The seamless tube, being widely used in the automobile, aviation, petroleum, chemical, building, boiler, and military industries, is called the “blood vessel of industry.” The demands for high-quality seamless tubes are increasing continuously. Piercing is the first deformation process in seamless tube production and has great influence on the quality of the product. This paper takes the Diescher piercer as the object of study and builds the DEFORM finite-element model of piercing process. The DEFORM model of piercing process can substitute for practical production and serve as a simulation platform of the production process. The DEFORM model can be used for the optimization of the process parameters and the prediction of quality, and it also greatly reduces the debugging time and the production cost. Therefore, the model has great theoretical significance and is of great value in practical use. Finally, by combining the DEFORM finite-element model with the ensemble OSC-PLS-ELM mathematical model, we build the hybrid model, which further increases the precision of the quality forecast. The ensemble OSC-PLS-ELM method has the advantages of both the PLS and ELM, i.e., the characteristics of robustness and feature extraction of the PLS method and the quick nonlinear processing capability of ELM.