Original scientific paper

Experimental and numerical analysis of coining process using microforming approach

Zdenka Keran orcid.org/0000-0001-7894-6590 ; Faculty of Mechanical Engineering and Naval Architecture, I. Lučića 5, 10000 Zagreb, Croatia
Miljenko Math ; Faculty of Mechanical Engineering and Naval Architecture, I. Lučića 5, 10000 Zagreb, Croatia
Branko Grizelj ; Mechanical Engineering Faculty in Slavonski Brod, Trg Ivane Brlić Mažuranić 2, 35000 Slavonski Brod, Croatia

Abstract

This study concerns the analysis of significant changes of process parameters in a coining process when dealing with different grain sizes. A reason for these changes can be found if the coining process is understood as a microforming process. Using that approach a few problems are explained and solved: large elastic springback, insufficient die filling, significant enlargement of total forming force, changes in friction factor. An experimental research provided data about percentage of elastic springback in total high reduction during coining process of Al 99,5 in three grain sizes. An experiment also included microscopic observation of gravure filling. The final result is a correlation between grain sizes and elastic springback, and also a correlation between grain sizes and gravure filling for different forming forces. Using experimental data in the creation of numerical FE (finite element) model, the dependence of contact friction changes in correlation to the change of the grain size is presented. Physical interpretation of the results is given by the theory of Bowden and Tabor.

Keywords

coining process; die filling; microforming; process parameters

Hrčak ID:

75396

URI

https://hrcak.srce.hr/75396

Publication date:

27.12.2011.

Article data in other languages: croatian

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