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Metal Extrusion Processes - Direct Extrusion, Indirect Extrusion, Aluminium Extrusions
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Extrusion is the process of pushing a billet of metal through a die with a shaped cutout thus producing a continuous cross section of material. Aluminium extrusions are the most common product of this process.
That is a simplified description of the process known as direct extrusion, which is the most common method in use today. Indirect extrusion is a similar process, but with some important differences. In the direct extrusion process, the die is stationary and the ram forces the alloy through the opening in the die. In the indirect process, the die is contained within the hollow ram, which moves into the stationary billet from one end, forcing the metal to flow into the ram, acquiring the shape of the die as it does so.
Direct extrusion and indirect extrusion are commonly used to form solid extruded shapes. For hollow shape extrusion operations such as piercing are introduced to form the hollow centre. Aluminium extrusions are by far the most common form of metal extrusions.
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