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A High Reliable Automated Percussive Riveting System for Aircraft Assembly

Shanghai Jiao Tong University-Yunfei Fan, Long Yu, Qingzhen Bi, Yuhan Wang
Shanghai Top NC Tech Co. Ltd.-Yilian Zhang
Published 2019-03-19 by SAE International in United States
Percussive riveting is a widely used way of fastening in the field of aircraft assembly, which used to be done manually. Nowadays, replacing the traditional percussive riveting with automated percussive riveting becomes a trend worldwide, which improves the quality of riveting significantly. For the automated riveting system used in aircraft assembly, reliability is of great importance, deserving to be deeply researched and fully enhanced. In this paper, a high reliable automated percussive riveting system integrated into a dual robot drilling and riveting system is proposed. The riveting system consists of the hammer part and the bucking bar part. And both parts have been optimized to enhance the reliability. In the hammer side, proximity switches are fully used to detect the state of rivet insertion. In the bucking bar side, a reliable step height measurement system is integrated to measure the exposed shank length of the rivet before riveting and the upsetting head height after riveting. Meanwhile, a reliable method is proposed to calibrate the measurement system. By measuring the exposed shank length of the rivet…
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On-Line Non-Destructive Measurement for Interference-Fit Riveting Based on Force-Deformation Data Analysis

Shanghai Jiao Tong University-Yilian Zhang, Qingzhen Bi, Long Yu, Yuhan Wang
Wuhan University-Nuodi Huang
Published 2017-09-19 by SAE International in United States
Interference-fit riveting is a critical fastening technique in the field of aerospace assembly. The fatigue and sealing performance of the rivet joint are determined by the interference-fit level of the rivet joint. As a result, it is of great importance to measure the interference-fit level accurately and effectively. Conventional interference-fit level measurement methods can be divided into direct measurement (destructive test on test-piece) and indirect measurement (off-line dimensional measurement of upset rivet head). Both methods cannot be utilized in automatic riveting. In this paper, an on-line non-destructive measurement method is developed to measure the interference-fit level. By taking full advantage of servo-driving riveting integrated with force measurement, the force-deformation data of the deformed rivet can be obtained in real time. The recognized feature points from the force-deformation data can reflect the height of the upset rivet head. An algorithm to calculate the diameter of the upset rivet head based on the recorded maximum riveting force is developed. So as to obtain the volume of the upset rivet head. Thereafter, the volume of the rivet shank…
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