Method for calculating rotor assembly axis eccentricity based on radial skip measurement

Abstract

The invention relates to a method for calculating the eccentricity of a rotor assembly axis based on radial skip measurement, which comprises the matrix representation of each point data and the calculation of relative skip value, the establishment of an equivalent spring model and the calculation of each point contact force under an ideal state, and the direction and magnitude of the eccentricity. The calculation of relative runout value of each point and the calculation of assembly interference of each point according to the diameter jump data of two stopper fitting surfaces; Based on the assumption of elastic deformation, the spring equivalent model is established to analyze the relationship between force and displacement in each stage of the contact process, and then the non-uniform contact force at each point is obtained by the non-uniform interference. The determination of eccentricity is based on the equivalent model of spring and the equilibrium equation of state to determine the size of the eccentricity. Based on the measured diameter skip data in production practice, the method realizes the prediction of axis eccentricity before assembly, improves the coaxiality of rotorafter assembly, and has important practical guiding significance for the axis prediction, assembly phase adjustment and optimization in the assembly process of aero-engine rotor parts.

Description

technical field [0001] The invention belongs to a rotor assembly axis eccentric calculation method, which can be applied to the axis prediction, assembly phase optimization, and assembly guidance process in the assembly process of important components such as a high-pressure compressor rotor of an aeroengine, a high-pressure turbine disc, and a low-pressure rotor assembly. 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. The positioning of the rotors at all levels depends on the spigot fit, and the spigot fit is an interference fit. The axis eccentricity is mainly due to the uneven shape of the fit of the seam before assembly, which leads to the uneven radial force around the seam after assembly. Therefore, combined with the ac...

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Problems solved by technology

Fitting circle method is a method of least squares fitting based on the measured radial runout data at the joint of the spigot, and calculates the eccentricity of the assembly axis through the fitting circle of the inner and outer slits of the two rotor parts. This algorithm is simple in procedure and can Grasp the shape characteristics of the fitting surfaces of the seams as a whole, but because the fitting circle obtained by the least square method cannot fully reflect the amplitude characteristics of the initial shape, the error between the fitting circle and the initial shape circle is irregular, Therefore, the accuracy of the predicted axis eccentricity is difficult to guarantee; the actual rotation centerline method is the axis eccentricity prediction method adopted by Axiam Company, and its essence is to find out the actual eccentricity generated after assembly by measuring the runout data at the seams of all levels of discs. Rotate the axis, and adjust and optimize the assembly phase based on this axis. This method is mainly used in foreign countries. The key technology has not yet been introduced into China. It has high prediction accuracy. However, due to the limitation of the manufacturing level of parts in China, the phenomenon of parts out of tolerance is common. Existence, this method does not have the basic alignment and tilting process of the roundness instrument in the application process, it is difficult to adapt to the production and assembly process of China's aero-engine rotors

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