Analysis of Reactions and Minimum Clamping Force for Machining Fixtures with Large Contact Areas |
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Authors: | B Li S N Melkote S Y Liang |
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Affiliation: | (1) The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Georgia, USA, US |
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Abstract: | This paper presents a model for analysing the reaction forces and moments for machining fixtures with large contact areas,
e.g. a mechanical vice. Such fixtures transmit torsional loads in addition to normal and tangential loads and thus differ
from fixtures using point or line contacts. The model is developed using a contact mechanics approach where the workpiece
is assumed to be elastic in the contact region and the fixture element is treated as rigid. Closed-form contact compliance
solutions for normal, tangential, and torsional loads are used to derive the elastic deformation model for each contact. A
minimum energy principle is used to solve the multiple contact problem yielding unique predictions of the fixture–workpiece
contact forces and moments due to clamping and machining forces. This model is then used to determine the minimum clamping
force necessary to keep the workpiece in static equilibrium during machining. An example is given to demonstrate its effectiveness
in analysing the clamping performance of a mechanical vice during machining. |
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Keywords: | : Clamping forces Contact forces Machining forces |
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