Device and method for tightening rear nuts of sealing disc of high-pressure rotor of aero-engine

Abstract

The invention discloses a device and a method for tightening rear nuts of a sealing disc of a high-pressure rotor of an aero-engine. The device comprises a transposition system, a feeding movement system and a connecting rod type tightening execution system, wherein the transposition system realizes numerical control rotation of the feeding movement system, the feeding movement system realizes axial linear feeding movement of the connecting rod type tightening execution system, and the connecting rod type tightening execution system moves a tightening sleeve to a tightening station so as to tighten the nuts. The device and the method have the advantages that a mode that a tightening power system is arranged inside an inner sleeve is adopted, and therefore the tightening transmission distance can be decreased, the error caused by transmission clearance and stress deformation can be reduced, and the nut tightening torque and the angle precision can be guaranteed; a sleeving mode of a plurality of sets of sleeves is adopted, and therefore the structural static rigidity is high, the movement stability is good, and the tightening quality can be guaranteed; and a numerical control operation mode is adopted, and therefore the automation degree is high, the movement precision is high, manual misoperation can be avoided, and the tightening consistency of all the nuts can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automatic assembly, and in particular relates to a device and method for tightening a rear nut of a high-pressure rotor seal plate of an aero-engine. Background technique [0002] In the core machine of an aero-engine, the high-pressure rotor is mainly composed of a high-pressure compressor rotor and a high-pressure turbine rotor. The rear end face of the rotor is connected, and the three are fastened by dozens of threaded connectors uniformly distributed along the axis of the axis to realize the assembly of the main structure of the high-pressure rotor. For some models, the nuts in the threaded fasteners are the rear-mounted nuts of the seal plate, which are located at the rear side of the seal plate, and the contact end is pressed against the rear mounting edge of the high-pressure turbine rotor. and special D-shaped bolts with corner lock function. Since the high-pressure rotor is the core power comp...

AI Technical Summary

Problems solved by technology

The size of the space occupied by the internal tightening of the high-pressure rotor varies depending on the engine model, but they all have the characteristics of narrow and long space layout. Among them, the axial depth of the nut relative to the rear shaft port of the high-pressure turbine rotor reaches 600-800mm, and the distance between the nut and the rear shaft of the high-pressure turbine rotor The inner diameter of the channel is φ100-150mm, and the distribution diameter of the nuts is φ250-400mm. For the operation of the tightening mechanism, there are difficulties such as long feed channel, small tightening space and multi-regional interference. The method of deflection and tightening relies heavily on manual work during the process, and does not use automatic special tightening devices, which has the following shortcomings: (1) Poor consistency of tightening quality: the method of manually tightening the wrench in place has nut installation offset and inclination, etc. The problem is that the tightening consistency of each nut cannot be guaranteed, and some nuts may even be screwed wrongly or missed. Because the current application devices are mostly slender rod-shaped structures, the overall rigidity is low, and the anti-twist effect is poor, resulting in the device being damaged during the tightening process. (2) Low tightening accuracy: the current application device mainly uses human torque equipment or external torque system as the tightening power input, which has the problem of long tightening transmission distance, due to the long-distance transmission has low rigidity, transmission Due to the large gap and the large uncertainty of the deformation form after loading, the actual torque and screw-in angle of the nut have a large deviation from the measured value of the remote sensor, and there are random errors that are difficult to compensate, and the nut tightening torque and rotation angle accuracy cannot be guaranteed; (3) Low tightening efficiency: After the installation of the nut group and the first tightening are completed in the existing method, the second tightening usually requires the device to be repeatedly inserted, installed, pulled out and disassembled in the high-pressure rotor in order to complete the tightening of the sleeve relative to each corner. It takes a lot of time to correctly position the nuts on the upper sleeve, which affects the efficiency of the second tightening; because the current application device relies heavily on manual operation, there are problems of high skill requirements and labor intensity, and all the nuts need to work together for more than 6 hours. Low operating efficiency affects the assembly accuracy of the whole machine

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