Dynamic Characteristics Analysis and Optimization Design of Cross-Beam Assembly in 3D Printer

As the carrier of sprinkler movement of FDM 3D printer, the movement accuracy of the beam directly determines the printing accuracy. In this paper, the beam assembly of a super large size FDM3D printer is analyzed. Firstly, the modal analysis is executed, and its 12-order modes and its dominant factors are obtained. The modal test is implemented to verify the validity of the model. Then, the harmonic response analysis of the cross-beam assembly is implemented, and it is found that the displacement values are higher than the printer precision requirements. Finally, using Workbench to achieve topology optimization and size optimization of the cross-beam component, a new cross-beam structure is obtained, and the first-order natural frequency is increased by 9.4% while the cross-beam component mass is reduced by 43.6%. The research results can provide a theoretical basis for the design and optimization of the cross-beam assembly of FDM 3D printer.