Experimental investigation of the jamming phenomenon in fixturing of workpiece using the peg-in-hole mechanism

Authors

Faculty of Mechanical and Mechatronics Engineering, Shahrood University of Technology, Shahrood, Iran

Abstract

The degrees of freedom of the workpiece can be constrained during its loading in the fixture, resulting in the jamming occurrence. It may cause improper workpiece positioning, damage to the workpiece, and even the fixturing elements. In the present study, theoretical and experimental analyses are performed to investigate the jamming phenomenon in fixturing workpiece using the peg-in-hole case study. The theoretical model is established based on the minimum norm principle which resulted in an optimization problem. The jamming occurrence is then predicted by solving this model in different configurations of the peg-in-hole problem. A theoretical model that was developed in the previous study is used to validate the predictions of the suggested theoretical model. The main validation of the theoretical predictions is conducted through the experimental analysis. For this purpose, an experimental setup is designed and fabricated for the peg-in-hole mechanism with the clearance fit. The friction coefficient is first measured using the fabricated setup. Then, the jamming-in and jamming-out angles of the peg into the prepared hole are measured using a rotary encoder. By comparing the experimental results to the predictions of the suggested theoretical model, the worst-case error values are determined as 8.2% and 14.4% for the jamming-in and jamming-out angles, respectively. These values represent the accuracy of the suggested mathematical model in the prediction of the jamming occurrence conditions and reliability of its results.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 3
October 2020
Pages 77-89

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