Page 83 - Module DMV20173
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4.0 BULK DEFORMATION PROCESSES
Figure 4.18 Illustrations of hydrostatics extrusion process.
4.4.5 HOT EXTRUSION
Figure 4.19 Hot extrusion products.
1. This type of process is used to minimize the forces seen by the tools and by the die.
2. Basically hot working process.
3. Done at high temperature (50-75% of melting point of the metal) and high pressure
(35-700 MPa).
4. High cost process.
5. Die wear can be excessive.
6. Cooling of the surface of the hot billet and die can result in highly non-uniform
deformation.
7. To reduce cooling of the billet and to prolong die life, extrusion die maybe preheated.
BPLK 115 DMV 20173
