Research On Key Technologies Of Multi-link Mechanical Press

Mechanical presses have been used in a number of engineering fields,because it can complete of all forging processes.The function of the various components of the mechanical press is analyzed synthetically,and it is concluded that the multi-link mechanism as working mechanism of mechanical presses has the greatest influence on the mechanical performance.The eight-bar linkage mechanism is widely used as a working part of a mechanical press because of its ability to complete a good drawing process.However,it has many parameters and complicated movement,so there are difficult design problems and it is also difficult to obtain the motion curve which fulfill the requirements of the process.Based on the research results of kinematics,dynamics simulation and optimization design of multi-link slider mechanism of mechanical presses,combined with the high efficiency and adaptability of intelligent algorithms,Mathematical expression of the relationship between the crank angle and the movement of the slider is build.Based on the practical requirements of the eight-bar slider mechanism,the mathematical model of optimal design is established.And the multi-objective optimization algorithm NSGA-II which based on method of Pareto is used to optimize the design of the rod system.Taking the mechanical design of the specific stroke as an example,the optimization design process is demonstrated comprehensively.The simulation shows that the optimized design meets the design requirements.Based on the MATLAB platform,the simulation software(Eight-OD)is developed is designed to optimize the motion.The influence of each bar on the stroke of the slider is analyzed by orthogonal experiment method,and the optimization result of the three-dimensional model is established.The modal analysis of the rod system,for the engineering design staff to provide vibration reference rod.