Principle of Extrusion

PRINCIPLE OF EXTRUSION

Extrusion is a compression forming process in which the work metal is forced to flow through a die opening to produce a desired cross-sectional shape. The die opening resembles to the cross section of the required product. In general, extrusion is used to produce long parts of uniform cross section.

The force requirement for the cold extrusion process is high. So, most of the metals are extruded in hot conditions only. Metals such as steel and nickel rods are extruded in hot conditions. The most extruded parts are door trim, hardware items and aircraft parts.

Cold extrusion is also done for commercial metals. The extruded products may be either solid or hollow. Metals such as lead, tin and coppers are extruded in cold conditions because of its low density and strength.