| Citation: | Zhang Wei, Wu Huaiyuan, Liu Bowen, et al. High-precision assembly technology of bolt connection with spigot structure under axial deviation[J]. Journal of Aerospace Power, 2026, 42（X）：20250183 doi: 10.13224/j.cnki.jasp.20250183
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Aiming at the problem of poor assembly accuracy of the mounting side of the aero-engine stop bolt connection structure, the assembly mechanism and error analysis of the stop bolt connection structure under the axial deviation are proposed, based on which the mounting side assembly model that can record the circular center offset is further constructed, and the assembly accuracy of the tightening sequence, the number of tightening steps, and the number of process bolts are compared by concentricity. Finally, the optimal assembly process was obtained by test validation with reduced-scale simulated parts, characterized by the concentricity of the assembly and the amount of deformation change of the upper and lower two-stage discs' outreach end surfaces. The results show that: (1) the surplus stop of the stop bolt connection structure has a compensating effect on the axial deviation, and the effect is more obvious in the simulation, which can make the 200 μm axial deviation almost reduced to 0 μm, and the 122 μm axial deviation can be greatly reduced in the test; (2) the optimal assembly process is that the tightening sequence should use diagonal cross-tightening, the number of steps of tightening should use three-step tightening, and the number of process bolts should use four. (3) The concentricity increased by 4.69 times in the tilted assembly test, and tilted assembly must be avoided in the assembly process.
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