The influence of die shape on the flow deformation of extrusion forging

The flow deformation of extrusion forging is similar to that of the initial pre-forging of closed-die forging and is frequently found in the forming process of high strength parts. Therefore, understanding the influence of the die shapes on metal flow deformation will be beneficial in designing a forging die or in determining the parameters of the forging process. In this paper, the finite element method was used to analyze the influence of die shapes with different draft angles and fillet radii on the extrusion forging deformation. Experiments using two sets of dies with different shapes were performed, and the results were compared with the predictions of the finite element method for the same deformation mode. Thus, the results of the deformation analysis in this study were extended to the design of a more complicated pre-forging die and in the planning of a forming process. This would be beneficial for the forging industry.