A method for calculating rotor assembly axis deflection based on end-jump measurement

Abstract

A method for calculating the deflection of the rotor assembly axis based on end jump measurement, including three parts: the calculation of three contact points, the triangle judgment criterion and the skew matrix homogeneous coordinate transformation algorithm; the three-point contact calculation mainly includes the characterization of the initial measurement data, contact Determination of points, determination of deflection direction and characterization method; the triangle judgment criterion is used to judge whether the obtained three points are in line with reality, and the judgment principle, calculation method and determination process of discarding points are described in detail; the homogeneous coordinate transformation algorithm of skew matrix includes inclination angle Matrix characterization of direction and size, calculation method and matrix representation method of the overall axis deflection of the final assembly result, etc. This method is based on the measured end jump data in actual production, realizes the prediction of the axis deflection before assembly, improves the coaxiality of the rotor after assembly, and greatly improves the pass rate of one-time assembly. The axis prediction, assembly phase adjustment and optimization in the model have important practical guiding significance.

Description

technical field [0001] The invention belongs to a method for calculating the deflection of the rotor assembly axis, which can be applied to the axis prediction, assembly phase optimization, and assembly guidance processes in the assembly process of important components such as aeroengine high-pressure compressor rotors, high-pressure turbine disks, and low-pressure rotor assemblies. Background technique [0002] In the equipment manufacturing process, assembly, as a very important link, has a direct impact on the performance and reliability of the product. For aero-engine rotor components, it is very important to ensure that the coaxiality after assembly meets the requirements. In order to reduce the time and labor costs caused by "trial and error" assembly and improve the coaxiality after assembly, the prediction of assembly phase and Optimization is very important, and in order to improve the pass rate of one-time assembly and reduce the wear and tear of parts and time cos...

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Problems solved by technology

The fitting plane method is a least squares fitting based on the runout data of the measured rotor end face, and the method of calculating the stacking deflection by fitting the plane equation. This processing algorithm is simple and can grasp the relationship between the two joint surfaces as a whole However, for rotor joint surfaces with "double high points" or irregular topography, the error between the fitting plane and the source data is relatively large, and the accuracy of the predicted axis deflection is difficult to guarantee; the actual rotation centerline method It is the axis deflection prediction method adopted by Axiam Company. Its essence is to find the actual rotation axis generated after assembly by measuring the runout data of the disc end faces at all levels, and adjust and optimize the assembly phase based on this axis. This method is mainly used in foreign countries, and the key technology has not been introduced into China, so it has high prediction accuracy. However, due to the limitation of the manufacturing level of high-end parts in my country, the phenomenon of parts out-of-tolerance is common. There is no basic adjustment of the roundness meter in the application of this method. It is difficult to adapt to the production and assembly process of aero-engine rotors in my country.

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