复杂外形航空发动机TC4钛合金宽弦空心风扇叶片弯扭成形

doi:10.7527/S1000-6893.2014.0271

Abstract

Abstract:

Twist-bend forming is considered as an effective auxiliary forming means for titanium wide-chord hollow fan blades. It is used to form the hollow blank to the preferred in-process shape, which improves the manufacturability. For the process test sample of certain type of TC4 titanium wide-chord hollow fan blades used in high bypass ratio turbofan engines, a single-axis and a double-axis twist-bend forming approaches are proposed. The design method for the motion parameters is developed based on the analysis of forming principle and clamps movement rules. Numerical method is used to investigate the effects of different twist-bend manners and load paths on the result, such as obtained geometries, deformation distribution, required torque and skin deflections. The forming experiment is conducted. The results show that the single-axis manner can obtain satisfactory result using the following process parameters: 750 ℃ for forming temperature, 20.4° for twist angle of top clamp and 0.68 (°)/min for twisting velocity. Grooves do appear on the blade skin as the FE analysis predicts.

Key words: turbofan engines, titanium alloys, wide-chord hollow fan blades, TC4, twist-bend forming, pre-forming

CLC Number:

WU Xinchen, CHEN Minghe, XIE Lansheng, ZHANG Tielei, HU Zhihua. Twist-bend forming of aeroengine titanium TC4 wide-chord hollow fan blade with complex geometries[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(6): 2055-2063.

References

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Twist-bend forming of aeroengine titanium TC4 wide-chord hollow fan blade with complex geometries

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