Optimization design of the load-bearing structure of press frame based on minimum flexibility

Abstract

In order to improve the stiffness and the accuracy of the press structure at work, this paper takes JH31-250 press as the research object and carries out the optimized structural design of the internal support frame in the walls of the press. The press frame model is established in SolidWorks and analyzed numerically in Abaqus for its mechanical properties under work conditions. We found out that the first-order inherent frequency of the press is much higher than the frequency of the excitations at work according to the finite element modal analysis results, so the press action load can be simplified as a static load. Therefore, static numerical analysis of the structure is carried out to assay the stress and the displacement distribution of the structure at work, and the variable density structural topology optimization technique with minimum flexibility as the goal is introduced to find the innovation configuration of the sidewalls. Then, we regularized the design domain of the topology optimization result. After these works, the optimal design of the structure is finally realized. The comparison between the original structure and the optimized structure shows that the low-order frequencies of the structure are changed slightly, but the relative deformation of the optimized structure is largely reduced by 12.4%. Considering the frequencies of various excitation sources during the operation of the press, it can be seen that the optimized structure meets the requirements of use and will not resonate, but the stiffness and accuracy have been greatly improved. The study of this demonstration can be a reference of structural optimization for similar products.