A Method for Calculating Eccentricity of Rotor Assembly Axis Based on Radial Runout Measurement

Abstract

A method for calculating the eccentricity of the rotor assembly axis based on radial runout measurement, including the matrix representation of each point data and the calculation of the relative runout value, the establishment of the spring equivalent model and the calculation of the contact force of each point under the ideal state, the direction and size of the eccentricity; The calculation of the relative runout value of each point, and the process of calculating the assembly interference of each point according to the radial runout data of the two seam mating surfaces; the establishment of the spring equivalent model is based on the assumption of elastic deformation, and analyzes the force and contact at each stage during the contact process. Displacement relationship, the non-uniform contact force of each point is obtained by the non-uniform interference; the determination of the eccentricity is based on the spring equivalent model, and the final determination of the eccentricity is calculated according to the equilibrium state equation. This method is based on the measured radial runout data in actual production, realizes the prediction of the axis eccentricity before assembly, improves the rotor coaxiality after assembly, and predicts the axis, adjusts and optimizes the assembly phase during the assembly process of the aeroengine rotor parts It has important practical guiding significance.

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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