FEM Analyses of Friction Coefficient in Open Die Coining Process of Different Grain SizesZdenka Keran*, Miljenko Math and Petar Piljek
Faculty of Mechanical Engineering and Naval Architecture, Department of Technology, Ivana Lucica, Croatia
- *Corresponding Author:
- Zdenka Keran
Faculty of Mechanical Engineering and Naval Architecture
Department of Technology
Ivana Lucica 5HR-10000 Zagreb, Croatia
E-mail: [email protected]
Received Date: January 19, 2012; Accepted Date: January 23, 2012; Published Date: January 26, 2012
Citation: Keran Z, Math M, Piljek P (2012) FEM Analyses of Friction Coefficient in Open Die Coining Process of Different Grain Sizes. J Material Sci Engg 1:105. doi: 10.4172/2169-0022.1000105
Copyright: © 2012 Keran Z, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The study concerns the analysis of significant contact friction changes by changing the size of crystal grains in the processes of free axisymmetric work pieces upsetting, initial height of 2 mm. The friction changes result with significant changes in forming force. This phenomenon usually characterizes micro forming processes. Using hard experimental data in the creation of numerical FE (finite element) model, a dependence of the changes of contact friction in correlation to the change of the work piece crystal grain size for three different grain sizes: 39, 47 and 76 μm is presented. It is shown that the friction factor is increased by reducing the size of crystal grains. Physical interpretation of the results is given by theory of Bowden and Tabor.