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Extrusion is a manufacturing process that involves pushing a material, usually a metal or plastic, through a die to create a specific shape. The temperature at which this process is performed can have a significant impact on the properties of the resulting product. Hot extrusion and cold extrusion are two common methods of extrusion that differ in the temperature at which they are performed.

Hot extrusion involves heating the material to a high temperature, typically above its recrystallization temperature, before extruding it through the die. This process allows the material to be deformed more easily and with less force, resulting in a smoother surface finish and greater dimensional accuracy. The high temperature also promotes grain refinement and can improve the mechanical properties of the final product.

Cold extrusion, on the other hand, is performed at or near room temperature, without heating the material. This process is typically used for materials that are more difficult to deform, such as some types of metals and alloys. The lower temperature makes it more difficult to push the material through the die, and the resulting product may have a rougher surface finish and less dimensional accuracy than a product produced through hot extrusion.

In summary, hot extrusion and cold extrusion are two different methods of extruding materials that differ in the temperature at which they are performed. Hot extrusion is performed at a high temperature and allows for easier deformation, while cold extrusion is performed at or near room temperature and is used for materials that are more difficult to deform.
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