A localization model for snubber machining of precision forging blade

The compressor blades of aero-engines are usually produced with precision forging technology to get net-shape free-form surface of the blades. Due to the complex shape of blade snubber, it's very difficult to get net-shape for it. While, there are still lots of raw material around it, further multi-axis machining is needed. However, without raw material left on blade surfaces, it is very difficult and skill-dependent to design special fixture to localize the blade with its net-shape free-form surface for multi-axis milling. In order to mill blade snubber with high accuracy, a mathematical model for localization precision forging blade with snubber is proposed in this paper. According to the processing characteristic of precision forging blades, a point set selection method based on the CAD model is proposed. In this method, localization transform parameter is obtained by using SVD (Singular Value Decomlocalizing), and solving process is completed by employing iterative nearest point (ICP) algorithm. Finally, a machining simulation experiment is carried out to validate the effectiveness of the proposed method.