Abstract: The machining of the titanium aircraft component is difficult to conduct in terms of material and structure，so both the structural and material matches between cutting tools and work-pieces need to be considered． At present，a systematic method to evaluate and select cutting tools used in the high-performance machining of domestic aviation manufacturing industry is highly demanded． Aiming at this issue，a testing benchmark model is constructed on the basis of existing researches in this paper，which takes into account the typical difficult-to-cut features of titanium aircraft components，and proposes two fuzzy comprehensive evaluation models of cutting tool performance of rough and finish milling on the basis of fuzzy mathematics theory． Then，by the milling experiments of the benchmark model，the proposed fuzzy comprehensive evaluation models are used to evaluate the cutting tool performance of end mills． The results show that the constructed benchmark model and the proposed fuzzy comprehensive evaluation models can be used to assess the cutting tool performance of end mills for titanium aircraft components accurately and rapidly．

Key words: titanium alloys, aircraft component, milling, cutting performance evaluation