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Characteristic Analysis and Structure Optimization of Die-cutting Mechanism of Automatic Flat Die Cutting Machine

2018-09-26 分享

With the rapid development of the packaging industry, the demand for high-performance die-cutting machines is increasing rapidly. However, from the perspective of existing products on the market, domestic die-cutting machine products have a large gap with foreign advanced products in processing speed, processing precision, work stability and reliability, and most of the market is occupied by foreign products. It is extremely urgent to improve the quality of domestic die-cutting machine products. As the core part of the die-cutting machine, the die-cutting mechanism plays a vital role in the overall working ability and performance of the die-cutting machine. Therefore, in-depth study of the working principle and kinematics of the die-cutting mechanism is the key to improve the working ability and performance of the die-cutting machine. Scientific and rational optimization of the die-cutting mechanism is to improve the market competitiveness of China's die-cutting machine products. Fundamental measures. This project combines a certain model die-cutting machine product of Tangshan Yuyin Company to carry out systematic kinematics analysis of its double toggle drive mechanism, and establishes it based on the purpose of improving the kinematics of the mechanism and the quality of die-cutting process. The design scheme of the new conjugate cam drive mechanism is designed and optimized by the modern design method. Under the premise of satisfying the die-cutting precision, the working speed of the die-cutting mechanism is increased to 7500 rev / hr, and Correspondingly, the overall working performance of the die cutting machine is improved. The main work contents and research results of the thesis are as follows:Firstly, for the existing model number die-cutting machine products, a mathematical model is established for the die-cutting mechanism, and the complex vector method is used to accurately solve the motion. The equation of motion of each member of the double toggles is obtained by MATLAB program. The displacement, velocity and acceleration curves of the members of the die cutter at the highest working speed (6000 rev / hr) are obtained. According to the motion characteristic curve of the double toggle mechanism, the main factors affecting the performance of the die-cutting mechanism and its influence mode are obtained. Among them, the acceleration motion law of die-cutting platform, connecting rod and upper toggle has the greatest influence on the performance of die-cutting machine. The peak acceleration of the die-cutting machine has a large impact load, and the motion law of the die-cutting platform is not Meet the requirements of die cutting process. Based on the improvement of the kinematics of the mechanism and the quality of the die-cutting process, the improved acceleration motion law of the die-cutting platform is used as the design criterion. The structure of the double toggle mechanism is fully optimized, and the conjugate cam drive is used instead of the crank. The design of the drive, and the conjugate cam mechanism was accurately reversed by MATLAB, and the precise contour of the conjugate cam was obtained. Finally, the motion simulation analysis of the optimized conjugate cam drive mechanism is carried out by ADAMS, and the displacement, velocity and acceleration curves of each component in the new mechanism are obtained. By comparison, the conjugate cam drive mechanism is designed at the working speed ( The motion characteristics at 7500 rpm are more conducive to improving the motion accuracy of the mechanism and more in line with the die-cutting process requirements, making the structure simpler and more compact, thus more effectively improving the working ability and performance of the die-cutting mechanism.

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