| Citation: | LI Zhe, WANG Xin, ZHANG Yi, et al. Mechanism and experiment on high-efficiency chip removal in ultrasonic vibration core drilling of CFRP[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(1): 229-240. doi: 10.13700/j.bh.1001-5965.2018.0620(in Chinese)
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To solve the problems of poor chip removal effects like the chip adhesion and rod jamming of core drill tool that would have a significantly negative influence on machining efficiency and machining quality during common core drilling (CCD) process of carbon fiber reinforced plastics (CFRP) using a core drill, the novel ultrasonic vibration core drilling (UVCD) technology was employed so as to carry out the basic theory and experiment study of high-efficiency core drilling CFRP. The core drilling principle and high-efficiency chip removal mechanism of UVCD were analyzed by theoretical method, meanwhile the machining effects of high-efficiency chip removal in UVCD of CFRP was verified by experimental method with a designed ultrasonic vibration air drill and lathe platform. The results indicate that compared with the CCD of CFRP, in the UVCD process, the chip removal effects of chip and rod are greatly improved, the problems of chip adhesion and rod jamming of core drill tool are effectively prevented, the thrust force, cutting temperature and hole surface roughness decrease by 12%-20%, 16%-24% and 33%-39% respectively, the machining quality of CFRP hole is obviously improved, and the tool life of core drill will be evidently prolonged.
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