A mathematical approach to analysis and optimal design of a fixture locating scheme |
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Authors: | GH Qin WH Zhang M Wan GH Qin |
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Affiliation: | (1) Sino-French Laboratory of Concurrent Engineering, Department of Aircraft Manufacturing Engineering, Northwestern Polytechnical University, 552, 710072 Xi’an, Shannxi, China;(2) Department of Mechanical Engineering, Nanchang Institute of Aeronautical Technology, 61, 330034 Nanchang, Jiangxi, China |
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Abstract: | In manufacturing engineering, localization accuracy is a key concern in the design of a fixture to specify a locating scheme
and tolerance allocation. This paper presents a general analysis methodology that is able to characterize the effects of localization
source errors based on the position and orientation of the workpiece. From this methodology, a fixture model is formulated
by taking into account the overall errors among the system consisting of the workpiece and the fixture in the design of the
fixture locating scheme. With this model, the locating principle and a criterion of the robust optimal design are then proposed
to improve the localization quality of the fixture. Some examples are provided and allow for a detailed discussion about how
to carry out the optimal design of the locating scheme. A comparative study is also made between the optimal solution and
the empirical one. Finally, an experiment is made to validate the fixture locating scheme for a cylindrical workpiece. We
conclude that this robust design method effectively achieves stable machining precision in workpieces. |
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Keywords: | Locating principle Locating scheme Localization source error Optimal design Workpiece position error |
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