應(yīng)用于模具自由曲面的新型彈性磨具拋光技術(shù)研究
[Abstract]:As one of the core technologies in manufacturing industry, mould is an important process equipment used to manufacture molding products in industrial production, and it has been widely used. Polishing is the final and most critical process in the process of manufacturing die surface, which has an important effect on the service life of die and the quality of products processed with it. In recent years, in order to improve the competitiveness of products, the design and use of freeform surface is becoming more and more, which puts forward higher requirements for die polishing. At present, the free surface of mould mainly depends on manual polishing, which is time-consuming and laborious, poor uniformity of polishing track, and difficult to guarantee the quality of polishing, which affects the rapid development of mould industry in China. Therefore, it is urgent to carry out theoretical and technical research on automatic polishing of die free surface. In order to solve the hot problem of automatic polishing of die free surface, a new type of elastic abrasive polishing technology applied to die free surface is presented in this paper, supported by the National Natural Science Foundation (51375361). The elastic polishing wheel tool used in this technology can form a large area of copying contact with the free surface of the die during the polishing process, and can change the cutting direction of the abrasive particle at any time and carry out the variable trajectory polishing, which can ensure the material removal efficiency at the same time. By improving the uniformity of polishing track and obtaining high quality machined surface, the automatic polishing of die free surface with high efficiency and stability can be realized by means of quantitative and controllable material removal characteristics. The main task of this paper is to study the material removal theory and polishing process of elastic polishing wheel tools. Firstly, according to the motion characteristics of elastic polishing wheel and the polishing process requirements, an elastic polishing wheel tool with rotation compound motion is designed. The tool can adjust the cutting direction of abrasive particles and polishing with variable trajectory. Secondly, the pressure distribution model of polishing contact area is established based on Hertz contact theory, and the velocity distribution model is established based on kinematics theory. The uniformity of polishing trajectory is analyzed again. According to the relative motion model of multiple abrasive particles, the motion trajectory equation of any point abrasive particle relative to the polishing contact zone is established, and the coefficient of variation is introduced to evaluate the uniformity of polishing trajectory. The effect of rotational speed ratio on the uniformity of polishing trajectory is revealed. Then, the theoretical model of material removal function is established based on Preston theory, and the simulation analysis is carried out. Then, the theoretical model of material removal function is verified by experimental design, and the rotation speed, rotational speed ratio and pressure drop are discussed by orthogonal experiment. The influence of the four main process parameters on the surface roughness and the material removal rate is studied. The polishing experiments are carried out to verify the correctness of the selected process parameters and the efficiency of the polishing method. Finally, the key technology of automatic polishing with elastic polishing wheel tools is discussed.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG580.692;TG76
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