恒力砂帶磨拋材料去除理論與實驗研究
[Abstract]:Blades are the core components of key equipments such as engines, steam turbines, compressors and so on in the aviation and power industries, because of their very bad working conditions. Therefore, the blade must have high profile accuracy and excellent surface quality in machining and manufacturing. Belt grinding and polishing is one of the common processing methods in blade finishing. At present, many scientific research institutions and companies at home and abroad have made a large number of grinding and polishing machine tools for the grinding of complex surface workpieces. By taking grinding force as one of the process parameters, the surface grinding and polishing of complex surface workpieces can be realized. In this paper, based on the theory of grinding and polishing, the grinding and polishing technology of complex surface workpiece is studied on the platform of constant force grinding machine. Based on the Preston equation and Hertz contact theory, the material removal profile and maximum material removal depth and normal polishing force are established for grinding workpieces with contact wheel abrasive belt grinding tools. The mathematical expressions of the three technological parameters: the linear velocity of the sand belt and the feed speed of the workpiece; The value of Preston equation constant Kp is determined by experiment, and the mathematical expression of the model is simulated. The relationship between the material removal law and the process parameters is analyzed and explained intuitively by using the simulation curve. In order to study the law of material removal from abrasive belt grinding, a constant force pneumatic control system is needed. The mathematical model of the constant force pneumatic control system is derived by using the relevant knowledge of thermodynamics law, ideal state equation and Newton's second law. Using off-line system identification technology and System Identification toolbox in MATLAB software, the unknown parameters in the mathematical model of pneumatic system are obtained by using M sequence as input excitation signal, and the closed-loop stability of the system is verified. After the mathematical model of pneumatic system is obtained, the block diagram of PID and fuzzy PID simulation program of the system is established, and the advantages and disadvantages of the two control strategies in this pneumatic system are compared by simulation. Then the program of these two control methods is written by using LabVIEW software. It is proved by experiment that fuzzy PID control method can achieve more ideal control effect for nonlinear system. The kistler dynamometer is used to verify that the system can accurately output the normal grinding force required in the machining process. The control software of pneumatic polishing is developed by using LabVIEW software, which can collect, transmit, process and control the signal data in the grinding process. It is convenient for users to operate in the grinding process. The material removal experiments were carried out with the aid of this polishing machine to verify the accuracy of the model of material removal profile and maximum removal depth. Finally, the accuracy of the material removal model is proved by comparing the curves obtained by experiments with the simulation curves of the model.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG580.6
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