Abstract

Blisk of aerospace engine is one of the sophisticated key parts in the aviation, which is difficult to machine considering its structural and material properties. The present paper develops a five-axis CNC milling machine for fabricating blisk with high-efficiency and high-quality as well as ensuring this milling machine with high precision and precision retention. Therefore, a precision analysis method is proposed to implement precision evaluation and precision life prediction of this milling machine. The five-axis CNC milling machine is used to machine blisk and measured about the error condition of various key components at different downtime, then these error indices are clustered into meta-action units garnered from the proposed function-motion-action structural decomposition method. The uncertainty information of these error indices are extracted by Shannon entropy to determine their objective weights, and their subjective weights are derived from AHP by the established function-motion-action-error hierarchical structure. Ultimately, the integrated weights of error indices and a sensitive analysis are employed to explore precision evaluation and precision life prediction of this milling machine, and a verification analysis using field data at different moments shows the rationality and reliability of the proposed approach.

中文翻译：

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基于元动作单元和综合权重并结合Shannon熵和AHP的五轴CNC铣床精度分析

摘要

航空发动机的叶盘是航空中复杂的关键部件之一，考虑到其结构和材料特性，很难加工。本文开发了一种五轴CNC铣床，可高效，高质量地制造炸药，并确保该铣床具有高精度和高精密度。因此，提出一种精度分析方法来实现该铣床的精度评估和寿命预测。使用五轴CNC铣床对叶轮进行机械加工，并测量在不同停机时间下各种关键部件的错误状况，然后将这些错误指数聚类为根据建议的功能-动作-动作结构分解方法获得的元动作单元。利用香农熵提取这些误差指标的不确定性信息，确定其客观权重，通过建立的功能-运动-动作-误差层次结构，从层次分析法推导其主观权重。最终，使用误差指数和敏感分析的综合权重来探索该铣床的精度评估和寿命预测，并且使用现场数据在不同时刻进行的验证分析表明了该方法的合理性和可靠性。