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The micro-intersecting cylindrical mandrel is a kind of high precision optical micro-nano element in the inertial confinement fusion (ICF) experiment. It has a complex structure and high precision requirement, and its machining quality directly affects the accuracy of ICF experiment. In this paper, the ultra-precision milling technology of polycrystalline oxygen-free copper micro-intersecting cylindrical mandrel was carried out. The composition of the surface defects after cutting were determined, and the formation mechanisms of different defects were analyzed. The optimal ultra-precision milling process was designed. The surface roughness Ra value of the machined cylinder 1 is 16 nm, and the Rq value is 21 nm. The surface roughness Ra value of the machined cylinder 1 is 20 nm, and the Rq value is 24 nm. Besides, the boundary defect in the transition arc region was eliminated. Finally, the polycrystalline oxygen-free copper micro-intersecting cylinder part with high surface quality and near no defect was manufactured after ultra-precision milling.
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