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Five-axis machining process route of titanium alloy fan blade profile

Large bypass ratio turbofan engine fan blades basically reach more than 500MM in length and size. This large-scale structural feature makes it endure very large centrifugal force and vibration stress during operation, so it has also become the first choice for large turbofan engines. Very important parts. At present, many turbofan engines still use technically mature titanium alloy damper fan blades. The narrow and long structure of this blade profile makes its weak rigidity in the form of a thin-walled structure in the back direction of the basin more prominent. This poor structural rigidity, the large overall area of the profile, and the difficult-to-process nature of the material have brought adverse effects to its use of traditional machining processes. This is intuitively reflected in the profile dimensional accuracy and position accuracy of the profile. It is difficult to ensure that manual polishing is inefficient and labor-intensive, and the leaf shape is prone to burns and ablation. The existence of the above problems constitutes a bottleneck in blade production. With the development and application of multi-axis CNC machining technology and research on this type of blade profile processing technology, the difficulties in processing this type of blade profile have been gradually broken through, and the processing quality and efficiency levels have reached a relatively ideal state.

In view of the difficult factors in surface processing of large titanium alloy fan blades, based on the comprehensive processing advantages of multi-axis linkage CNC machining technology, the main processing process routes determined are:

1. Processing of blade tenon and auxiliary positioning datum

2. CNC rough milling of blade profile

3. Stress relief annealing

4. Positioning benchmark repair

5. CNC precision milling of blade profile

6. Surface finishing.

The overall process idea established by the above process route is: CNC rough milling of the profile removes most of the margin and makes the fine milling process have an ideal margin distribution; CNC fine milling of the blade profile ensures the geometric dimensions of the profile and position accuracy basically meet the final accuracy requirements of the blade; the light finishing of the blade profile ensures that the surface layer quality of the profile meets the requirements.

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