Study on Numerical Model with Multi-layer Rigid Balls for Fabricating Curved Surface Based on Clustering Balls Spinning Method

摘要

Clustering balls spinning method is a new method for fabricating curved surfaces by clustering rigid balls. It is always one of options to explore forming mechanism by using numerical simulation method that is closer to the real experimental process. In this article, we have adopted a new numerical model with multi-layer rigid balls (MlRB), which is named as MlRB model and more responsive to actual experiments. The model subroutine is developed based on the ABAQUS software. Simulation procedure using MlRB model is introduced, and cross-section, thickness distribution and springback using MlRB model are analyzed and compared to the experimental results and simulated results using previous numerical model with single-layer rigid balls (SlRB), which is named as SlRB model. The results are shown that, curved surface and thickness distribution simulated by MlRB model are closed to experimental results, and springback of curved surface is much less. Furthermore, auxiliary forming region that benefits to make the sheet deformed furtherly is proposed and analyzed. It is indicated that MlRB model is successful to simulate the deformation of the sheet according to the experiment, and it lays the foundation for the optimization of the technology parameters in the future.