Reconstruction method of blade 3D profile based on line-laser scanning

Abstract:

As the core component of aero-engine, the blade plays a key role in its safety and reliability. The dimension and shape accuracy of the blade profile have always been strictly required in the process of blade machining and measuring. Thus, in this paper we propose a method for reconstructing the three-dimensional profile based on line-laser scanning. First, based on the developed four-axis blade measurement device, the rapid scanning and data acquisition of the blade profile are realized by combining the linear encoder and the line laser sensor. Then, a registration method based on the geometric features of the blade datum plane is further proposed to align the multi-view scanning data of blade profile, and the high precision reconstruction of the blade profile are achieved accordingly. Finally, a typical blade is taken as the experimental object for profile reconstruction experiment, and the profile reconstruction data is compared with the CMM measurement results from the same blade. The results show that the average deviation of cross-sections in blade profile is less than 0.040 mm and the standard deviation is less than 0.028mm. This demonstrates the accuracy and feasibility of the proposed method.