Abstract
Traditional methods for inspecting impellers on a three-axis Coordinate Measuring Machine (CMM) lack efficiency, since they need to adjust the clamping posture of the impeller or the probe orientation many times to avoid interference. In this paper, we propose an algorithm to generate efficient and interference-free scanning path for inspecting impeller on a cylindrical CMM. Firstly, the minimal number of probe tilt angles for inspecting the blade section is formulated as an optimization problem. The blade section is divided into several paths, each of which corresponds to one of the optimized probe tilt angles. Then, the feasible turntable rotation angles (FTRAs) in each path are calculated by an efficient incremental algorithm. Finally, the B-spline fitting and bisection method are used to generate a smooth turntable trajectory under the constraints of FTRAs. Inspection experiments on two impellers verify the efficiency of the proposed algorithm and the smoothness of the turntable rotation.
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