Comparision between Hot extrusion and Cold extrusion

Comparision between Hot extrusion and Cold extrusion

Hot extrusion

1.Surface is coated with oxide layers. Surface finish not comparable with cold extrusion.

2. Dimensional control not comparable with cold extrusion products.

3. High production rates but process fit for bulk material, not individual components.

4.Since processing is done hot, recrystallisation takes place.

5. Tooling subjected to high stresses as well as to high temperature. Tooling stresses are however lower than for cold extrusion.

6. Lubrication is crucial

Cold extrusion

1. Better surface finish and lack of oxide layers.

2. Good control of dimensional tolerance—no Machining or very little machining required.

3. High production rates at low cost. Fit for individual Component production.

4. Improved mechanical properties due to strain hardening.

5. Tooling subjected to high stresses.

6. Lubrication is crucial.

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