Dr. Zhongwei Li Profile

Dr. Zhongwei Li

at Huazhong Univ of Science & Technology

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Proceedings Article | 26 June 2017 Paper

Automatic 3D inspection metrology for high-temperature objects

Liya Han, Zhongwei Li, Kai Zhong, Jie Yi, Yusheng Shi, Xu Cheng, Guomin Zhan, Ran Chen

Proceedings Volume 10334, 103340O (2017) https://doi.org/10.1117/12.2270241

KEYWORDS: 3D metrology, Inspection, Metrology, Optical alignment, Optical inspection, Manufacturing, Optical testing, Measurement devices, Robotic systems, Time metrology, 3D scanning, Calibration

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3D Visual Inspection for high-temperature objects has attracted more and more attention in the industrial and manufacture field. Until now it is still difficult to measure the shape of high-temperature objects due to the following problems: 1) the radiation and heat transfer through the air seriously affect both human and measurement equipment, so the manual measurement is not capable in this situation. 2) Because of the difficulties to handle the surfaces of the hot objects, it is hard to use artificial markers to align different pieces of data. In order to solve these problems, an automatic 3D shape measurement system for high-temperature objects is proposed by combing an industrial robot with a structured blue light 3D scanner. In this system, the route for inspection is planned with the cooled object and then executed automatically with the same object in hot state to avoid artificial operations. The route is carefully planned to reduce the exposure time of the measurement equipment under the high-temperature situation. Then different pieces of data are premapped during the planning procedure. In the executing procedure, they can be aligned accurately thanks to the good repeatability of the industrial robot. Finally, different pieces of data are merged without artificial markers and the results are better than methods with traditional hand-eye calibration. Experiments verify that the proposed system can conduct the inspection of forging parts under the temperature of 900°C and the alignment precision is 0.0013rad and 0.28mm.

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