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A reasonable layout of the fuselage material was found by the topology optimization. Then, for the combined frame of straight side press, its three-dimensional model was established by SolidWorks, and the finite element analysis model was built by HyperMesh. Based on the variable density method and the static analysis, the density of material was defined as the design variable, the topology optimization of fuselage was carried out by OptiStruct solver under different setting constraints and objective functions. Comparing with the optimization results of two schemes, the structure of fuselage was improved, and the optimized model was analyzed by static and modal analysis. Finally, it is verified that the optimized press body meets the requirements of actual use. The weight of press frame decreases by 7.6% to achieve the lightweight body, save costs and improve the competitiveness of enterprises after optimizing.
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