| Citation: | Li Zhaoyu, Zhang Pengfei, Wei Wei, et al. Research on combined tightening system for blind cavity of aero-engine rotors[J]. Journal of Aerospace Power, 2026, 41（7）：20250239 doi: 10.13224/j.cnki.jasp.20250239
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The traditional rotor blind cavity bolt tightening mechanism adopts a one-time unfolding structural form, and the tightening torque is small, which cannot be applied to the tightening conditions of the new generation of aero-engine rotors in terms of accessibility and structural strength. To solve this problem, the technical requirements for tightening blind cavity bolts were first analyzed. Based on this, a design scheme for combined tightening of large and small torques was proposed: a tightening mechanism in the form of gear transmission was used to tighten and preload bolts with small torque, and a tightening mechanism in the form of an integral swing was used to achieve the final loading of the target torque. The design of the torque tightening mechanism was completed based on multi-objective optimization methods, and the motion trajectory planning of the tightening mechanism was carried out through kinematic simulation. The torque accuracy control method based on calibration method and the motion accuracy control method based on global positioning were both studied, achieving precise output of tightening torque and precise matching of geometric pose of the mechanism rotor, which were integrated into the blind cavity bolt automatic tightening system. This system can achieve a target tightening torque of 48 N·m for bolt tightening operations, with a tightening torque accuracy of ±2%, and it can also complete all bolt tightening work within 70 minutes. Based on this system, a two-step tightening process method was proposed and validated on the new generation of aero-engine, solving the problem of poor consistency in bolt preload and improving bolt tightening efficiency.
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