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| Method for Rapid Verticality Detection of Aviation Drilling Holes |
| YU Hou-yun,CHENG Ya-ni,SUN Yi-hong,FU Pan,QU Zheng-hang |
| College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China |
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Abstract To solve the problem of verticality detection of aviation drilling holes on site, a fast and high-precision method is proposed based on laser ranging sensor. Firstly, an expansion mandrel is stably supported in the hole to simulate its axis. Then the point cloud data of the holes end face is obtained with the ranging sensor and an angle encoder, which are both installed on the mandrel. And the normal vector of the face is further fitted. Finally, the angle between the vector and the axis is calculated as the verticality. At the same time, a 3D point cloud reconstruction algorithm based on RANSAC is proposed to improve the measurement accuracy. The systematic error, caused by the reference reflected by the expansion mandrel, is compensated after the vectors are synthesized. The measuring device is calibrated by verticality gauges and the experiments of verticality detection are completed for both plane and curved parts. The result shows that the measurement repeatability is less than 0.01° and the maximum indication error is within ±0.1°. It takes less than one minute for each hole. So the requirements of the accuracy and efficiency for on-site detection can be met.
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Received: 29 April 2022
Published: 25 June 2023
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2023, Vol. 44 
