Manufacturing method of deep shaft cavity compression nut tightening force limiting tooling

1. This technology belongs to the technical field of aero-engines, and particularly relates to a force-limiting tool for tightening a deep-shaft cavity compression nut.

Background technique:

2. The aero-engine structure has a long-axis rotor connection method, which is connected by a locking nut with a spring ferrule, in which the long shaft is a hollow shaft and the rotating shaft is a spline shaft, as shown in Figure 1 and Figure 2, first of all The spring ferrule 19 needs to be pressed tightly to avoid interference when the lock nut 21 is screwed, and then the lock nut 21 needs to be fed into the shaft cavity of the long shaft 18, and screwed on the central shaft 20, and then tightened to the specified torque. Loosen the spring ferrule 19 to ensure that the spring ferrule locking piece 23 is locked with the locking nut locking groove 24 . The installation difficulties mainly include: 1) The minimum diameter of the shaft cavity of the long shaft is 89mm, and the depth of the lock nut installation position is 1461mm. It is impossible to feed the nut by hand, and the nut feeding and screwing mechanism needs to be designed; 2) The locking nut screwing process It is necessary to press the spring ferrule at the same time to ensure that the spring ferrule does not interfere with the lock nut; 3) The installation position of the lock nut cannot be directly observed by the human eye, so ensure that the spring ferrule is just locked when the lock nut is screwed to the specified torque. It is difficult to enter the nut locking groove.

3. There is currently no relevant technology or tooling for the feeding of nuts and the screwing of threads in the narrow space of the deep shaft cavity of the aero-engine, and the alignment of the locking plate and the locking groove without direct observation by the human eye is currently common. The hole detector equipment is used for observation, but the visible range of the hole detector equipment is narrow, and the probe needs to be moved frequently during the operation, resulting in an unstable observation position, and it is difficult to find the position to be observed. The operation is complicated and the efficiency is low. Therefore, the hole detector The instrument is only suitable for inspection work after installation is completed.

4. Therefore, how to install the lock nut more accurately is a problem that needs to be solved.

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