| A REVIEW ON FRICTION AND LUBRICATION IN AUTOMOTIVE
METAL FORMING: EXPERIMENT AND MODELING |
| Kijung Lee, Chanmi Moon, Myoung-Gyu Lee |
| Seoul National University |
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| ABSTRACT |
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Metal forming or shaping processes, such as sheet metal forming and bulk forming, are widely used in many
industries including automotive industry. Before computational simulations were widely used in the field of metal forming
industry, the trial-and-error based empirical approach was conventionally applied to the optimization of the metal forming
process and product. The most commonly employed numerical approach in the metal forming process for robust process
optimization is the finite element analysis. Friction, one of the parameters that significantly affect the accuracy of numerical
analysis, depends on several variants such as surface quality, contact pressure, lubrication, deformation, and the forming
environment. Despite the complexity and difficulty of identifying friction mechanisms, accurate friction models are essential
and hence have been proposed by numerous researchers. In this paper, the friction models in the previous studies are reviewed
by categorizing them into the boundary lubrication condition and mixed-boundary lubrication condition according to their
evaluative influences on friction. Since friction models have been proposed based on the contact theories, an overview on the
contact models is also included in this paper. In addition, the contribution of several parameters on the friction such as surface
roughness and material properties of the tool, adhesion, contact pressure, sliding speed, bulk deformation is also discussed. This
review paper aims to provide an understanding and insight into the friction modeling and simulation along with associated
friction experiments. |
| Key Words:
Metal forming, Friction model, Real contact area, Asperity flattening, Boundary lubrication, Mixedboundary
lubrication |
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Corresponding Author.
Myoung-Gyu Lee , Email. 
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