Dynamic Simulation And Structural Optimization Design Of Multi - Link Press

With the development of industry and raising economy, new requirements are put forward on mechanical design. Forging manufacturing is one of the most important part of mechanical industry, how to improve forging quality become a difficult question. In recent years, multi-link press is a new hotspot in the field. It can improve. performance and quality of mechanical products, reduce manufacturing cost and design cycle, Compared with crank-link mechanism press, the velocity of multi-link press is more uniform in the working stroke, so, it can improve the quality of workpiece.In this thesis, finite element technology and dynamics, kinematics theory is used as the basic method to do depth study on various of engineering difficulties, such as displacement, velocity, acceleration, frequency, stress, etc. Set a variety of optimization and analysis techniques to improve press’s structure. The main research work of the paper are as listed below:1. Summarizes the research results at home and abroad, use Newton-Raphson iteration method to get performance curve of the mechanical press. Set up eight-link model in ADAMS. Study the influence and acceleration sensitive of each design point combination with parametric design method and the virtual prototype technology. Express the movement characteristics and influence of design point in a more intuitive way. The research shows, eccentric wheel is the most important factor that change the performance of press.This method is simple, reliable and can be widely applied in engineering application.2. Due to the complexity of multi-link structure, long life cycle of assembly and design, the paper optimizes slider’s acceleration based on OPTDES-SQP method. Acceleration is reduced nearly30%after optimization, so as to achieve better stamping performance. Establish3D model of transmission mechanism and verify the strength in workbench. The results provide a theoretical basis for structure design of transmission mechanism.3. The paper finds innovative ways to analysis stiffness and strength of typical position, flexible dynamic performance analysis model is established based on coupled method, the model can calculate the transmission force at any moment. Do rigid-flexible coupling analysis in top dead center and bottom dead center moment based on finite element analysis and motion analysis software, verifies the correctness of simulation. It provides a new method of numerical analysis to further study about the dynamic characteristics of connecting rod mechanism.4. According to the production and performance requirements, improve the overall structure of the press, optimize the size of the structure and portfolio approach through static and dynamic analysis of finite element. This greatly reduced the energy consumption of the material, achieve the goal of energy saving. To sum up, the article takes advantages of practical production, giving new optimization method combined with virtual technology and finite element method (FEM). These theories have guiding significance for multi-link press design and control of the entire machine performance.