Precision tightening technology for aeroengine blind cavity nuts

The connection quality of the narrow blind cavity of the aeroengine rotor has a great impact on the overall assembly quality of the rotor. The precise control ability of the bolt connection process is inadequate given the current domestic and international circumstances, which impact the connection mechanical properties of the mating surface of the rotor disc and shaft parts. This is because there is a lack of accurate and efficient assembly tooling for the blind cavity structure. Based on the above research status, according to the tightening assembly requirements of a certain type of blind cavity nut, the blind cavity tightening system is divided into a tightening torque transmission mechanism and an operation actuator. In the design of the tightening torque transmission mechanism, firstly, the torque method and torque angle method are compared to determine the torque angle method as the final execution process. The input and output torque model is established taking into account the torque loss to determine the input torque of the tightening tool in order to achieve high-precision control of the tightening torque. At the same time, the torque transmission structure is designed and the strength and longevity of important components are examined. In the design of the operating actuator, firstly, the mechanical design of the actuator and the 3DCS simulation of the high-precision moving parts worm gear and worm are carried out. At the same time, the trajectory planning and kinematics simulation are carried out by using MATLAB. Based on the aforementioned research, the blind cavity nut tightening technology is experimentally verified, and a perception system and control system for visual identification are built to achieve high-precision equipment control. It is of great significance to improve the quality and consistency of the blind cavity bolt array connection between the narrow disks.