Assembly device for low-pressure turbine shaft-disc assembly of aero-engine

Abstract

The invention discloses an assembly device for a low-pressure turbine shaft-disc assembly of an aero-engine. The assembly device comprises a turbine clamp, a turbine shaft posture adjustment and buttjoint system, a transposition type tightening system and a lathe bed. According to the assembly device, the turbine clamp realizes horizontal installation of the axis of a turbine unit body; the turbine shaft attitude adjustment and butt joint system realizes parallel calibration movement and concentric calibration motion of the contact end surface of a turbine shaft relative to a connecting discand realizes feeding butt joint motion of the turbine shaft relative to the connecting disc; the transposition type tightening system realizes transposition of a tightening shaft to a tightening station corresponding to bolts distributed circumferentially. The assembly device has the advantages that a horizontal installation mode of the axis of a low-pressure turbine shaft-disc is adopted, so thatcentering positioning calibration of the turbine shaft relative to the connecting disc can be realized, the end surfaces can be accurately and tightly attached, and therefore the butt joint assembling precision can be improved; and the transposition type tightening system is adopted, the bolt pre-tightening force deviation can be effectively controlled by using the tightening shaft, and thereforethe tightening quality can be ensured; and a gantry type mobile station is adopted, and therefore the problem of motion interference in the feeding process of the tightening system can be solved.

Description

technical field [0001] The invention belongs to the technical field of automatic assembly, and in particular relates to an assembly device for a low-pressure turbine shaft-disc assembly of an aeroengine. Background technique [0002] In an aero-engine, the low-pressure turbine shaft is assembled with the connection plate at the end of the low-pressure turbine unit body through the front flange structure to realize the power transmission of the low-pressure turbine rotor. Due to the large external load on the low-pressure turbine rotor, the shaft-disk assembly bears tens of tons of axial force and tens of thousands of Nm of transmission torque, and its connecting part is a key vulnerable position with sudden change in cross-section, so the shaft-disk assembly Assembly performance is an important factor affecting the reliability of engine operation. [0003] During the assembly process of the low-pressure turbine shaft-disc assembly, the relative posture and posture of the lo...

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Problems solved by technology

In the above-mentioned assembly process, a large number of manual operations are relied on, and no automatic special assembly device is used, which has the following disadvantages: (1) The precision of component docking is low: the axial dimension of the turbine shaft with a length of about 2m is too large, and it is hoisted by a sling It is difficult to align the micro-distance displacement, which affects the centering accuracy of the components; it is difficult to adjust the attitude of the vertical turbine shaft through a mechanical mechanism, and it is impossible to meet the requirements of flexible assembly to adapt to the error of the paired contact surface, and it is difficult to ensure that the connection contact surface is correct Tight fit; (2) The tightening quality of the manual operation torque wrench is unstable, and the deviation of the bolt pre-tightening force is as high as 25%-50%, which leads to easy loosening of the bolts at the weak connection parts under working conditions; the application of the numerical control tightening shaft can effectively control the pre-tightening force. The deviation of the tightening force is less than 10%, but due to the limitation of the tightening work space, the axial feed mechanism of the tightening shaft is easy to interfere with the spreader, fixture and other structures, and the method of using the mechanical arm as the lateral feed mechanism of the tightening shaft is costly , low rigidity and low efficiency; (3) Existing assembly equipment relies heavily on manual operation, with low operating efficiency and poor assembly consistency; the vertical assembly method of existing equipment makes it difficult for workers to observe and operate, and requires high skills for workers , labor-intensive

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