Abstract
The main goal of this study is to examine the influence of process conditions such as reduction and punch face angle in backward extrusion, especially for surface stresses such as surface expansion, contact pressure and sliding velocity and distance. Extensive analysis has been performed for the forming efficiency and flow mode. The simulation has been conducted by applying rigid-plastic finite element method. It was found that the relative movement at the contact interface increases with decrease in punch face angle and with increase in reduction such that sliding mode is expected for smaller punch face angles with larger reductions.
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