Advanced Technologies and Materials

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Vol. 37 No. 1 (2012): Journal for Technology of Plasticity
Original articles

FEM analysis of friction coefficient in open die coining process of different grain sizes

Zdenka Keran
Faculty of Mechanical Engineering and Naval Architecture, Ivana Lucica 5, Zagreb, Croatia
Miljenko Math
Faculty of Mechanical Engineering and Naval Architecture, Ivana Lucica 5, Zagreb, Croatia
Petar Piljek
Faculty of Mechanical Engineering and Naval Architecture, Ivana Lucica 5, Zagreb, Croatia

Published 2012-06-29

abstract views: 23 // Full text article (PDF): 10


Keywords

  • coining process,
  • numerical simulation,
  • friction coefficient

How to Cite

Keran, Z., Math, M., & Piljek, P. (2012). FEM analysis of friction coefficient in open die coining process of different grain sizes. Advanced Technologies and Materials, 37(1), 15–22. Retrieved from https://jged.uns.ac.rs/index.php/atm/article/view/JTP.2012.37.1.2

Abstract

The study concerns the analysis of significant contact friction changes by changing the size of crystal grains in the processes of free axisymmetric workpieces upsetting, initial height of 2 mm. The friction changes result with significant changes in forming force. This phenomenon usually characterizes microforming 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 workpiece 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.

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