JIANG Sansheng 1，ZHOU Yang 2
(1. Beijing Vocational College of Agriculture, Beijing 102208, China; 2. Beijing Jiaotong University, Beijing 100044, China)
Abstract: The point clouds of a satellite navigation radome were obtained by three-dimensional scanning technology, and the 3D deviation analysis between the point clouds and the theoretical model was carried out based on the Geomagic Control. A set of moulds for gelcasting were designed for preparing the green body of quartz ceramic radome. The principle of monomer polymerization reaction was analyzed, the process of gelcasting and the working process of mould were discussed. The characteristics of six kinds of common 3D printing processes were analyzed. The gelcasting mould for navigation radome was prepared by SLA 3D printing, and its properties were also tested. The results indicated that the standard deviation of the point clouds obtained by three-dimensional scanning technology is 0.0011 m, and its overall linear deviation is only 0.25%. When the laser irradiation power was set to 300 mW and the spot diameter was set to 0.15 mm, the actual density of the radome mold material prepared by SLA printing is 1.08 g/cm3, the dimensional accuracy is ± 0.1 mm, and the bending strength is 74.1 MPa, the surface roughness is less than Ra 12.5 μm.
Key words: satellite navigation; radome; gelcasting; mould; 3D printing