Very Large Cnc Bending Machine Marine Body Structure, Finite Element Analysis And Optimal Design

With the development of rolling machine in larger scale and higher precision, the structural optimization of rolling machine is becoming more and more important. The following aspects have been studied in this thesis with larger CNC bending machine.Firstly, the force of the working roll and supporting roll are obtained by the analysis of process parameters on the bending machine, and the force of the beam and lathe bed are also calculated, which make basic for the structural optimization of the beam and lathe bed.Secondly, the three-rolling type plate bending model is built in Solidworks and analyzed by using ANSYS/LS-DYNA, the relation ship of bending-radius and the upper roll decent quantity and stress of the working roll, the beam and lathe bed are researched, and the simulative results with the theoretical results is compared and analyzed the reason of error.Thirdly, the static and modal analysis of the beam and lathe bed are implemented by using ANSYS, the maximum displacement, maximum stress, natural frequency and the vibration mode are obtained from the analysis results, which provide based data for structural optimization of beam and lathe bed.Lastly, according to static and modal analysis results, the weight optimization of the beam and lathe bed are implemented by using ANSYS optimization module and the optimization of design documents in the case of meeting the maximum stress and deformation. Increasing the stiffness of the beam and the lathe bed is implemented through the finite element analysis and structural optimization.