Preload Scheme Designing And Forming Performance Optimization Simulation Of Drawing Hydraulic Press And Its Application

With the rapid development of fossil energy, rail transportation aerospace industry and application of new materials such as titanium alloy, the main components in petrochemical pipeline, high-speed train and aerospacecraft melt towards maximization, complexity and high-accuracy directions. The design of drawing hydraulic press was faced with higher requirement. This paper according to the problems existing in the design of drawing hydraulic press:the bend gapping between column and upper beam, lack of consideration about prestress in structure optimization and the deficiency in rationality verification with the design results. The preload scheme designing and forming performance optimization simulation of drawing hydraulic press were put forward. It was applied in the actual exploring progress of the drawing hydraulic press.The main research content of this dissertation were listed below:In the first chapter, the present situation of drawing hydraulic press was summarized. The present research on the preload of body, structure optimization and simulation technique were discussed. The problems met in the design of drawing hydraulic press was described, What’s more, the research content and the framework of this dissertation were presented.In the second chapter, the preload scheme designing method of the body in drawing hydraulic press based on sequential approximate technology was proposed. The influence factors of integrity were discussed. The factors were considered as designed variables to establish the preload scheme designing module based on sequential approximation method which used Kriging. The solving process of the module was proposed. Finally, the preload scheme designing of150MN drawing hydraulic press was studied as an example to verify the feasibility of the method mentioned above.In the third chapter, the structure parameter optimization method of the column in drawing hydraulic press based on cell evolution mechanism was proposed. The evolution mechanism of the cell include in the polyhedron sandwich was analyzed. A new kind of column filled with polyhedron sandwich structure was described. And then the evolution parameters was considered as the design variables, the mass of the column was considered as the optimization goal, the prestress, strength and stiffness was considered as constraints to build the structure multidisciplinary optimization model of the column based on radial basis function approximation method. Genetic algorithm was used to get optimal solution. Finally, the new kind of column was used in the150MN drawing hydraulic press. The optimization of this column plate was studied as an example to verify the feasibility of the method and the reliability of the new column mentioned above.In the fourth chapter, the simulation method based on simulation component was used to analyze the forming performance of the drawing hydraulic press. The forming performance of the drawing hydraulic press was decomposed into three aspects as the movement of the beam, the vibration and the stiffness of the parts from the angle of kinematics, dynamics and statics. So forming performance in various fields was realized. Finally, forming performance of the150MN drawing hydraulic press was studied as an example, and the simulation tree was built to explain the method. The movement of the beam and the stiffness of the lower beam was analyzed based the method mentioned above.In the fifth chapter, structure design and the optimization simulation system of the drawing hydraulic press was developed based on the theory and method mentioned above. The effectiveness of the method above was further proved.In the sixth chapter, the outlook of the future research was presented on the basis of summing up the research content of the whole dissertation.