| Citation: | GAO Yanfeng, FANG Xiang'en, XIONG Jun, et al. Tilted orbital milling method for hole-making of CFRP/titanium alloy laminated structures[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(5): 851-861. doi: 10.13700/j.bh.1001-5965.2019.0330(in Chinese)
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In a titled orbital milling process, the cutting tool is set as tilted against the axis of the hole with a small angle, which makes the revolving motion of cutting tool in conventional helical milling process be changed to a conical pendulum motion. It reduces the axial drilling forces and improves the hole-making quality. In this paper, the tilted orbital milling method is adopted to make a hole for the Carbon Fiber Reinforced Polymer (CFRP)/titanium alloy laminated structures. The material removal rates in the region of entrance and exit of hole, the ratios of the material removed by peripheral cutting edge and frontal cutting edge, and the velocity zero point in the frontal edge are analyzed. Compared with the conventional helical milling process, there is no sharply change of the material removal rate in the entrance and exit of hole, its peripheral cutting edge milling ratio is increased, and the the velocity zero point in the frontal edge is not cut. The axial cutting forces and cutting temperatures are analyzed through experiments. The results show that the axial cutting force and temperature decrease significantly in the tilted orbital milling process. The morphology of the holes is checked through Scanning Electron Microscope (SEM), and the results show that the delamination of CFRP in the region of entrance is eliminated and there is no obvious defect in the boundary region of CFRP and titanium alloy. The results of this research show that the tilted orbital milling method is helpful to improve the hole-making quality of CFRP/titanium alloy laminated structures and has a potential application in the industry.
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