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4.0 BULK DEFORMATION PROCESSES
4.4.6 EXTRUSION FORCE
Controlled by:
1. The strength of the billet materials.
2. The extrusion ratio.
3. Friction between the billet and the chamber and die surfaces.
4. Process variables such as the temperature of the billet and the speed of extrusion.
Extrusion force, F can be estimated from the formula:
F=A k ln (Ao/Af)
0
where:
k = extrusion constant (Figure 5.22)
A = billet area
0
A = extruded product area
f
Figure 4.22 The K values for several metals for a range of extrusion.
BPLK 118 DMV 20173
