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| Research on 3D Milling of Honeycomb Sandwich Structure High-Precision Panel |
| LI Dongsheng, YOU Jiaqi, WANG Mingming |
| (College of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China) |
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Abstract The 3D milling finite element simulation model of honeycomb sandwich structure high-precision panel is established. The influence of the spindle speed, the feed speed and the milling depth on the surface roughness and the temperature of the honeycomb sandwich panel are analyzed. The orthogonal milling experiment and non-destructive testing of water ultrasonic pulse reflection method have been carried out, in company with optimizing the milling parameters. Based on the simulation analysis and experiment, the 400mm×400mm double-curvature high-precision sandwich panels with focal lengths of 5500mm, 2750mm, and 1090mm are milled, as well as non-destructive testing of ultrasonic pulse penetration method. Meanwhile both the surface precision and roughness are inspected before and after forming. The results show that the experimental results are consistent with the finite element simulation. The surface roughness of the sandwich plate after milling is negatively correlated with the spindle speed, and is positively correlated with the milling depth and feed rate. Plus, the panel temperature is mainly determined by the milling depth. When the single milling depth exceeds 300μm, the panel temperature exceeds the glass transition temperature of the epoxy resin (313K), and the sandwich structure is slightly debonded. Eventually the precision value, the peak-to-peak value (crest-to-valley value) and the surface roughness value of the double-curvature panels are significantly reduced. No debonding phenomenon occurs simultaneously. It is verified that milling can improve the surface quality of the panel on the basis of ensuring structural stability.
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2020, 
