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.

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.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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