engleski

Experimental and numerical analysis of coining process using microforming approach

This study concerns the analysis of significant changes of process parameters in coining process when dealing with different grain sizes. A reason for these changes can be found if 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 coefficient. An experimental research provided data about percentage of elastic springback in total deformation during coining process of Al99.5 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 hard experimental data in the creation of numerical FE (finite element) model, a dependence of contact friction changes in correlation to the change of the grain size is presented. Physical interpretation of the results is given by theory of Bowden and Tabor.

coining process; gravure filling; microforming; process parameters

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