Ch. 8 Bulk Deformation // Extrusion & Drawing

Question 1

Extrusion

Answer 1

Forming process in which work metal is forced to flow through a die opening to produce a desired cross-sectional shape. Used to produce long parts of uniform cross sections.

Question 2

What are two types of extrusion?

Answer 2

Direct and indirect

Question 3

Hot Extrusion

Answer 3

• Heat the billet above the recrystallization temp
  -Reduce strength and increase ductility
  -Reduces ram forces and increases ram speed
  -Forms oxide films
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Question 4

Cold Extrusion

Answer 4

-Produce discrete parts at high rates
-Increases mechanical properties
-Improves surface finish partly due to lack of oxide films.
-Tight dimensional tolerances