Non-interference five-axis scanning track generation method and system

Abstract

The invention provides a non-interference five-axis scanning track generation method and system, which relate to the technical field of five-axis scanning measurement track generation. The method comprises the steps of S1, extracting a surface central axis of a three-dimensional free-form surface to be scanned and measured through a central axis extraction algorithm, and taking the surface central axis as a guide line, and S2, according to the feasible areas of different points on the guide line in the step S1, calculating and determining the optimal pixel positions of the feasible areas of the measuring seat, further fitting the optimal positions of the feasible areas, determining the number of optimal control points, and obtaining a smooth and non-interference measuring seat scanning track. According to the method, the feasible area of the next point can be quickly obtained by analyzing the interference condition of the edge position of the feasible area of the previous point on the guide line, so that the calculated amount of interference check is greatly reduced; and the track is smooth as far as possible under the condition of no interference.

Description

technical field [0001] The present invention relates to the technical field of five-axis scanning measurement track generation, in particular to a non-interference five-axis scanning track generation method and system. Background technique [0002] Parts with complex surfaces are widely used in the aerospace field. Whether it is quality inspection or reverse engineering, it is necessary to measure high-precision dense point clouds on the surface of the part. Three-coordinate measuring machines are widely used in industrial production links due to their high precision, large measurement range, and strong versatility. The traditional three-coordinate measurement mode mainly includes point-by-point measurement and three-axis scanning measurement. Due to its repetitive "start-stop" action, the point-by-point measurement has extremely low measurement efficiency when the number of measurement points is large. In the three-axis scanning measurement, the scanning process is comple...

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Problems solved by technology

[0006] [2] Y. Zhang, K. Tang, Automat ic Sweep Scan Path Planning for Five-Axi s Free-Form Surface Inspection Based on Hybrid Swept Area Potential Field, IEEE Transactions on Automation Science and Engineering, 16(2019) 261-277. They assume that the measured surface is relatively flat and there are no obstacles around it, which obviously does not match the actual application

[0007] During the actual measurement process, whether it is the part fixture or the structure of the part itself, it may interfere with the high-speed swinging stylus, causing serious collision accidents

Existing literature: [3] P.Hu, H.Zhou, J.Chen, C.Lee, K.Tang, J.Yang, S.Shen, Automatic generation of efficient and interference-free five-axis scanning path for free -form surface inspection, Computer-Aided Design, 98(2018) 24-38. A measurement path planning method that partially considers the interference problem, and also clearly points out that the special motion mode of five-axis scanning measurement makes the global interference inspection extremely consuming Time

Therefore, there is not yet an efficient method for generating measurement paths for non-interference five-axis scanning

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