关键词: 航空发动机, 配合界面, 数字孪生, 装配分析, 形貌测量, 数字化仿真

Abstract: With the improvement of machining accuracy and quality stability of aero-engine parts, assembly accuracy has gradually become the critical factor affecting product accuracy. In order to predict the influence of the form and posi-tion deviation of the mating surface on the final assembly deviation of the product, a large number of assembly error analysis methods based on mathematical models have been developed. However, most of the existing methods have greatly simplified the geometrical and physical information of the mating interface due to the limitation of the modeling method, although the convenience of calculation and analysis can be increased, these methods are not able to accurately characterize the deviation of the surface morphology and analyze its influence on the assembly. Especially for precision mechanical products such as aero-engines, small deviations can have an important impact on product quality and stability under large load conditions. Therefore, an assembly deviation analysis method based on Digital Twin technology is proposed in this paper. This solution uses the Digital Twin technology as the framework, uses the Skin Model Shapes as the modeling method of the feature surface, and combines the data-driven multi-factor computer simulation model to realize the comprehensive analysis of influence of the assembly mating surface deviation on the assembly accuracy. An engine assembly interface test workpieces are made, and the effectiveness of the proposed Digital Twin method is verified by comparing the experiment and simulation re-sults.

Key words: Aero-engine, Maing interface, Digital Twin, Assembly analysis, Surface Measurement, Digital simulation