Fixture Clamping Force Optimisation and its Impact on Workpiece Location Accuracy |
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Authors: | B Li SN Melkote |
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Affiliation: | (1) George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Georgia, USA, US |
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Abstract: | Workpiece motion arising from localised elastic deformation at fixture-workpiece contacts owing to clamping and machining
forces is known to affect significantly the workpiece location accuracy and, hence, the final part quality. This effect can
be minimised through fixture design optimisation. The clamping force is a critical design variable that can be optimised to
reduce the workpiece motion. This paper presents a new method for determining the optimun clamping forces for a multiple clamp
fixture subjected to quasu-static machining forces. The method uses elastic contact mechanics models to represent the fixture-workpiece
contact and involves the formulation and solution of a multi-objective constrained oprimisation model. The impact of clamping
force optimisation on workpiece location accuracy is analysed through examples involving a 3-2-1 type milling fixture. |
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Keywords: | :Elastic contact modelling Fixture clamping force Optimisation |
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