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Home » Extrusion Process » Aluminium Extrusion » Direct Extrusion


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Direct Extrusion

Process variables in Direct Extrusion
  • The die angle
  • Reduction in cross-section
  • Speed of Extrusion
  • Billet temperature
  • Lubrication.
Direct extrusion is also known as forward extrusion. Direct extrusion is one of the most critical as well as common method for making extruded profiles. Here the position of the die is stationary, while the metal gets pushed through the orifice. Here the billet is placed properly in the container and pushed along the die by using ram pressure. Direct extrusion has very popular applications. They are typically used in the manufacture of solid rods, bars, hollow tubes, solid sections etc. In direct extrusion, the direction of metal flow is in the identical direction as that of ram travel. In this process, the billet is slided relative to the walls of the container. The ensuing frictional force increases the ram pressure substantially. Conventionally, the process of direct extrusion has been described as having three distinct phases or regions:
However one of the main disadvantages of this process is the creation of frictional forces between the walls of the container and the metal. A typical Direct Extrusion process is shown below:
Direct Extrusion
This efficient process of direct extrusion saves a substantial amount of raw material and simultaneously provides improved product properties as compared to the traditional machining processes.


Advantages of Direct Extrusion
A Direct extrusion gives the following advantages:

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