Optimal Fixture Design Accounting for the Effect of Workpiece Dynamics |
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Authors: | B Li S N Melkote |
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Affiliation: | (1) The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA, US |
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Abstract: | This paper presents a fixture layout and clamping force optimal synthesis approach that accounts for workpiece dynamics during
machining. The dynamic model is based on the Newton– Euler equations of motion, with each fixture–workpiece contact modelled
as an elastic half-space subjected to distributed nor-mal and tangential loads. The fixture design objective in this paper
is to minimise the maximum positional error at the machining point during machining. An iterative fixture layout and clamping
force optimisation algorithm that yields the "best" improvement in the objective function value is presented. Simulation results
show that the proposed optimis-ation approach produces significant improvement in the work-piece location accuracy. Additionally,
the method is found to be insensitive to the initial fixture layout and clamping forces. |
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Keywords: | :Machining Optimal fixture-design Workpiece dynamics |
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