18.21 (USCS units) A direct extrusion operation is performed on a cylindrical billet with initial diameter = 2.0 in and length = 4.0 in. Die angle = 60°, and die orifice diameter is 0.50 in. In the Johnson extrusion strain equation, a = 0.8 and b = 1.5. The operation is carried out hot, and the hot metal yields at 13,000 lb/in? and does not strain harden. (a) What is the extrusion ratio? (b) Determine the ram position at the point when the metal has been com- pressed into the cone of the die and starts to extrude through the die opening. (c) What is the ram pressure corresponding to this position? (d) Also determine the length of the final part if the ram stops its forward move- ment at the start of the die cone.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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18.21 (USCS units) A direct extrusion operation is performed
on a cylindrical billet with initial diameter = 2.0 in and
length = 4.0 in. Die angle = 60°, and die orifice diameter
is 0.50 in. In the Johnson extrusion strain equation, a =
0.8 and b = 1.5. The operation is carried out hot, and the
hot metal yields at 13,000 lb/in? and does not strain
harden. (a) What is the extrusion ratio? (b) Determine the
ram position at the point when the metal has been com-
pressed into the cone of the die and starts to extrude
through the die opening. (c) What is the ram pressure
corresponding to this position? (d) Also determine the
length of the final part if the ram stops its forward move-
ment at the start of the die cone.
Transcribed Image Text:18.21 (USCS units) A direct extrusion operation is performed on a cylindrical billet with initial diameter = 2.0 in and length = 4.0 in. Die angle = 60°, and die orifice diameter is 0.50 in. In the Johnson extrusion strain equation, a = 0.8 and b = 1.5. The operation is carried out hot, and the hot metal yields at 13,000 lb/in? and does not strain harden. (a) What is the extrusion ratio? (b) Determine the ram position at the point when the metal has been com- pressed into the cone of the die and starts to extrude through the die opening. (c) What is the ram pressure corresponding to this position? (d) Also determine the length of the final part if the ram stops its forward move- ment at the start of the die cone.
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