关键词: 辊轧叶片, 前后缘, 加工曲面, 自适应建模, 形状调整

Abstract: To solve the CNC milling problems of the material forced outwards at leading and trailing edges of rolling compressor blades of aeroengine, an adaptive machining surface reconstruction method was proposed based on geometric adjustment of the design surfaces. Firstly, according to the free-form deformation theory and the surface energy control principle, a geometric control model of free-form surfaces with the use of deformation constraints was established. Then, based on this model, an adaptive surface reconstruction strategy was established based on genetic algorithm for leading and trailing edges of the rolling blades. By slightly adjusting the geometric shapes of the blade design surfaces, the deformed surfaces might move close to the measurement points of the blade bodies without losing their initial geometry seriously. Thus, the machining surfaces for the leading and trailing edges of the rolling blades might be reconstructed. The results show that the leading and trailing surfaces reconstructed with the above method may meet the shape accuracy and realize smooth transition with the actual blade bodies at the same time.

Key words: rolling blade, leading and trailing edge, machining surface, adaptive modeling, shape adjustment