Comparison between Forward extrusion and Backward extrusion

Comparison between Forward extrusion and Backward extrusion

Forward or Direct extrusion

1.Simple, but the material must slide along the

chamber wall.

2. High friction forces must be overcome.

3. High extrusion forces required but mechanically

simple and uncomplicated.

4. High scrap or material waste—18–20% on an

average.

Backward or Indirect extrusion

1. In this case, material does not move but die moves.

2. Low friction forces are generated as the mass of material does not move.

3. 25–30% less extruding force required as compared to direct extrusion. But hollow ram required limited application.

4. Low scrap or material waste only 5–6% of billet weight.

Leave a Comment