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Impact extrusion –we can handlepressure

Impact Extrusion – the Process

One idea that not everyone is likely to have, is that plastic deformation is possible with many materials. In impact extrusion – a mass forming process – pressure is exerted on the workpiece on a single or multi-stage press and, once the elastic deformation is exceeded, a permanent deformation of the part is achieved. In the case of a multi-stage forming process, this part is then transported to the next stage, where it undergoes another deformation.

This produces parts with extremely good dimensional and shape tolerances, a very good surface and – an advantage for most applications – increased hardness resulting from the process itself.

The classification of the procedure

The classification of impact extrusion processes is based on the one hand on the direction of the material flow in relation to the direction of action of the machine (forward, backward and transverse extrusion) and on the other hand on the workpiece geometry in solid, hollow and cup extrusion.

direct impact extrusion of rods


direct impact extrusion of cup-shaped sections


direct tubular impact extrusion


indirect rod impact extrusion


indirect impact extrusion of cup-shaped sections


indirect tubular impact extrusion


lateral extrusion


Advantages of Cold Extrusion

  • cost-effective process for large series due to fast cycle times and little or no material loss
  • better surface finish (stock removal approx. 10 - 15 µm; grinding approx. 1 - 10 µm; extrusion approx. 0.3 - 3.5 µm)
  • work hardening and thus, if necessary, elimination of quenching and tempering processes
  • cold formed parts can be produced even with complex geometries, such as with undercuts, asymmetrical contours etc.

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