Accuracy Analysis And Synthesis Of Aero-engine Rotor Flexible Assembly System Platform

With the rapid development of China’s aviation industry, the traditional aero-engine assembly way has been difficult to meet the engine for high efficiency, high precision and low cost assembly requirements. So, the aeroengine digital flexible assembly tooling were analyzed in this paper. The study has important implications for aviation engine manufacturing digital implementation.A method of posture alignment based on a three-axis column locating unit was developed to improve the positioning accuracy in aero-engine digital assembly system. The positioning error model of locating unit was constructed through synthetic analyzing of the influence factors of positioning accuracy. Then the comprehensive positioning error was calculated and had simulation analysis by using MATLAB software. Simulation results showed that the best reference position could be found and the accuracy of the locating units could be improved in the assembly process. Through the analysis of static and modal of the flexible tooling column, the weak link in the flexible tooling was found and several methods to improve the rigidity of the column was proposed.In order to improve the accuracy of the tooling system, precision synthesis and error compensation was studied. Firstly, according to the precision analysis and the positioning accuracy of flexible tooling, using the original error equivalent effect method and the independent action principle, accuracy synthesis was carried out based on manufacturing cost minimum, the level precision of ball screw was determined. Then, Ball screw gap error of servo system has been compensated with cubic spline interpolation method according to the law of random distribution of static error. The results show that the compensation amount is relatively smooth and there is no known cause loss of accuracy, the error of the coordinate positioning unit is reducing effectively.The study is significant for promoting digital implementation of aerospace manufacturing, improving aviation engine assembly efficiency and quality, and reducing assembly manufacturing costs.