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| Adaptive Machining for Blade Leading and Trailing Edges Based on Tool Path Adjustment |
| CHEN Zhenlin1, LUO Guimin2, ZHU Zhengqing3 |
1. AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China;
2. AECC South Industry Co., Ltd., Zhuzhou 412002, China;
3. Beihang University, Beijing 100191, China |
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Abstract In the net-near forming process of aero-engine compressor blade, the leading and trailing edges which have sharply changing curvature and cannot be directly formed need to be processed using NC machining. However, blade will be deformed in the early stage of the process, and the theoretical digital model can no longer be applied to the secondary processing. Therefore, in order to solve the problem of edges machining caused by blade deformation and realize the smooth transfer between blade edge and body, this manuscript presents an adaptive machining method for blade leading and trailing edges based on tool path adjustment. Firstly, the characteristic measurement points are extracted from the formed area near blade edges. And then, the deformation condition of blade in the early process is analyzed by the measurement data. Moreover, the mapping function between the Z coordinate value of the blade section and the deformation law is established according to deformation condition. Finally, the original nominal tool paths are adjusted according to the deformation mapping function and to realize the adaptive machining of blade edges using adjusted tool path. Taking the precision forging blade of a certain aero-engine as an example, the simulation results show that the optimization effect of proposed method is significant. Compared with the machining error using theoretical tool path, the adjusted tool path greatly reduces the machining error. The proposed method can effectively solve the problem of smooth transfer machining between blade edge and body of precision forging blades.
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