Abstract
Wolter-I focusing telescope is one of the important equipment for space exploration, and its mirror shells are mainly assembled by gluing connection, since the mirror shell is a typical ultra-precise component with thin wall of easy deformation and nanometer-level surface accuracy, the stress caused by micro-gluing will have an important impact on the surface accuracy of the shell, which will reduce its optical focusing performance. In this paper, we propose a stress-free micro-gluing method for thin-walled Wolter-I focusing telescopes, in which the fixing clip is fixed by free bonding, and then screwed to the base after the adhesive layer has cured. Firstly, finite element simulation was conducted to analyze the gluing force state of the mirror shell in two forms, and then micro gluing experiments were carried out for the mirror shell in fixed and free forms, and the gluing strain of the mirror shell was measured by curing GHJ-01(Z) epoxy at constant temperature to verify the validity of the simulation results. The experimental and simulation results show that there is a significant difference between the gluing force state of the mirror shell in the two forms, the strain value and the surface shape error of the mirror shell are lower in the free bonding state than in the fixed bonding state. This method can provide a reference for the bonding method of the assembly structure of Wolter-I type focusing telescope.
