Pushing a billet enclosed in a container through a die to form an extrudate.
Theory and Application
Bar extrusion is a process in which a block of metal (billet) is forced to flow by compression through a tool (die) opening of a smaller cross-sectional area than that of the original billet. There are two basic types of bar extrusion: direct and indirect. The most important and common method used is the direct extrusion (Lange 1988). Figure 1 shows the principle of direct bar extrusion where the billet is placed in the container and pushed through the die by moving a ram towards the die (Saha 2000).
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