Structural Optimization On The Base Frame Of TLJ400 Continuous Extrusion Machine

The base frame bears most of the weight of the continuous extrusion. Considering the safety factors, designers tend to select excessively the bigger safety modulus in the structure design. Now more and more continuous extrusions are produced. As a result, excessively bigger safety modulus causes the waste of the steel. At the same time causes the whole machine is too big and heavy, not easy to delivery. Therefore, it is quite necessary to optimize the continuous extrusions' base frame structure.In virtue of ANSYS 10.0, the finite element analysis software, the thesis has made the analysis and optimum design of the continuous extrusions' foundation structure. First, the complex 3D geometric model of the TLJ400 continuous extrusion's base frame was established by using Pro/E, then translated into ANSYS model. And a finite element model was recreated based on ANSYS. The static analysis was completed under knowing normal loading conditions. The stress and displacement distribution are found and the new design was put forward. The result shows that the structure has higher strength and stiffness than original scheme.During the research, a dynamic strength test was made so that a comparison can get between simulation results and test results. If the comparison is very approach, it means that the FEM model is similar to the reality and if the comparison has great difference, it means the model should be modifying again.In order to realize the lightweight of foundation, the parametric model of foundation was built by using the APDL. In the process of optimization, the weight of steel structure of foundation was designated as objective function, the section sizes of major foundation section parameters as design variables, and the stress and the deformation as state variables. Finally, the strength and stiffness of the optimized model was checked to examine the reasonability of the optimal results and ensure the remarkable reduction of foundation's weight is made on condition that the performance of the steel structure meets its requirements. The optimum results show that the mass of foundation is reduced 2.366t, which is 45.56% of foundation weight, at the same time the stiffness and intensity can meet the requirement.The results of this research can provide design reference of the continuous extrusions' foundation structure, which demonstrate the efficiency of the finite element method for the foundation's structural design.