There are a number of methods to work a metal into different forms. One of the most widely used methods is extrusion. This involves pressing a workpiece into a die to obtain a material with a certain desired cross-section. Builders and suppliers prefer extrusion to other techniques because it is quicker and the output is much denser and smoother.
How Extrusion Works
The process starts with the preparation of the workpiece, which is a metal block of standard size. Depending on the desired result, the workpiece is either heated or kept at room temperature before being fed into the die. As soon as the billet is fitted inside the container, the plunger is placed on the opposite end and made ready to push the billet towards the die. The compressive force used to press the billet is enough to extrude the billet by way too low to affect the whole container.
Unlike casting, which involves smelting the metal, pouring it into a mold, and cooling to cure, the product of extrusion is virtually ready for use, unless further heat treatment is required to improve its mechanical properties. Sometimes, the output is stretched to adjust its dimension with the actual desired size and shape. Read more from this article: http://www.rotaxmetals.net/copper-and-brass-extrusions-how-are-they-manufactured/.
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