Metal Extrusion

What is Metal Extrusion?

Metal extrusion is a manufacturing process where a cylindrical billet of metal is forced through a die with a specific cross-sectional profile, producing parts with that profile along their length. This process can be used with various metals, including aluminum, copper, steel, magnesium, and lead.

Types of Metal Extrusion

Metal extrusion can be categorized based on several factors, such as the direction of extrusion flow, the medium used to apply force, and the working temperature:

The most common type where the billet moves in the same direction as the ram forcing it through the die.

The die moves towards the billet, which is stationary, reducing friction between the billet and container.

Uses hydraulic fluid to exert pressure on the billet, allowing for cold extrusion without friction between the billet and container.

Suitable for low melting point materials, with the die positioned on the side.

A cold extrusion process used for softer metals, where a punch creates the extrudate.

Characteristics of Metal Extrusion

Can create parts with complex and uniform cross-sections over their entire length.

Can achieve thin walls, approximately 0.4mm for aluminum and 2mm for steel.

Parts typically have an excellent surface finish, reducing the need for post-processing.

Produces a favorable elongated grain structure in the direction of the material flow.

Low raw material wastage and high production rate.

Advantages of Metal Extrusion


Can produce a wide range of structures and shapes.


High level of design flexibility for the extrusion die.


Produces precise products, reducing the need for secondary processes like welding.


Low cost per part due to continuous operation and high production volumes.

Applications of Metal Extrusion

Hot Extrusion

Used to produce electrical wires, bars, and tubes.

Cold Extrusion

Produces collapsible tubes, gear blanks, aluminum cans, and cylinders.

Gallery of Metal Extrusion

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