A Method of Precision Measurement,Reverse and Error Evaluation for Complex Curved Surface
To study the precision measurement,reverse engineering,and error evaluation methods of blade-like components,and to provide a digital error distribution model for the precision machining of such components,a space mathematical model was established to address the spatial radial bias issue of contact probes based on the four-point calibration method,which was used to calibrate the tool center point(TCP).For the scattered and unordered distribution of blade point clouds,a multi-level B-spline interpolation method was proposed for the surface reconstruction of the 3D blade point clouds.Finally,an iterative method was employed to accurately evaluate the blade errors.For the measured blade point clouds,the reconstruction algorithm based on multi-level B-splines and control grid differentiated subdivision can create high-fidelity continuous surfaces;the error evaluation algorithm can calculate errors between the measurement results and the design model no less than 0.01 mm and obtain a stratified and zoned error visualization cloud map.The robotic contact measurement system can achieve high-precision measurement of complex blade surfaces.The 3D reconstruction algorithm based on B-splines can quickly reconstruct the 3D blade surfaces.The error evaluation method proposed by the authors can calculate the errors in high-precision blade point clouds,and the stratified and zoned results have clear guiding significance for the polishing and precision machining stages of the blades.The feasibility and effectiveness of the proposed methods are demonstrated through theoretical analysis and final experimental results.
contact measurementthree-dimensional point cloudmultistage B-splinesurface reconstructionerror evaluation
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