In this paper, a dynamic model that considers the vibrations of both the workpiece and fixture elements in order to accurately predict the friction damping over a wide range of clamping forces has been developed. The model is established based on the theory of variational inequality and solved via a nonlinear FEM. It is shown that the model is capable of predicting the system dynamics over a wide range of clamping forces. It is also demonstrated that the increasing then decreasing trend of the damping ratio caused by “interface locking” is due to the relative velocity change at the contact interface. With multiple contact interfaces, the “locking” occurs sequentially. Finally, the model is used to study the influence of friction damping on machining process stability.
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Influence of Friction Damping on Workpiece-Fixture System Dynamics and Machining Stability
B. Fang,
B. Fang
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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R. E. DeVor,
R. E. DeVor
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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S. G. Kapoor
S. G. Kapoor
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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B. Fang
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
R. E. DeVor
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
S. G. Kapoor
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received February 2001. Revised August 2001. Associate Editor: S. Jack Hu.
J. Manuf. Sci. Eng. May 2002, 124(2): 226-233 (8 pages)
Published Online: April 29, 2002
Article history
Received:
February 1, 2001
Revised:
August 1, 2001
Online:
April 29, 2002
Citation
Fang , B., DeVor , R. E., and Kapoor, S. G. (April 29, 2002). "Influence of Friction Damping on Workpiece-Fixture System Dynamics and Machining Stability ." ASME. J. Manuf. Sci. Eng. May 2002; 124(2): 226–233. https://doi.org/10.1115/1.1459086
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