An upper-bound analysis of the geometric shape of the deformation zone in rod extrusion

1990 ◽  
Vol 21 (3) ◽  
pp. 303-311 ◽  
Author(s):  
D.S. Peng
Keyword(s):  
Upper Bound ◽  
Deformation Zone ◽  
Geometric Shape ◽  
Upper Bound Analysis ◽  
Bound Analysis

Upper Bound Analysis of Axisymmetric, Closed-Die Forgings

1981 ◽  
Vol 103 (1) ◽  
pp. 109-112 ◽  
Author(s):  
P. Dadras
Keyword(s):  
Velocity Field ◽  
Upper Bound ◽  
Deformation Zone ◽  
Admissible Velocity ◽  
Upper Bound Analysis ◽  
Die Forging ◽  
Closed Die Forging ◽  
Theoretical Predictions ◽  
Experimental Values ◽  
Bound Analysis

A kinematically admissible velocity field for axisymmetric closed die forging is proposed. The forging power and load are calculated and compared with experimental values. It is found that the theoretical predictions give estimates that are substantially higher than actual loads and powers. Also, the effect of different parameters on the height and shape of the deformation zone is investigated and it is shown that the height is independent of flash thickness and length. The angle of convergence of flow from the die to the flash decreases as the flash thickness is increased.

Upper-Bound Analysis

Metal Forming ◽  
2012 ◽  
pp. 110-127
Author(s):  
William F. Hosford ◽  
Robert M. Caddell
Keyword(s):  
Upper Bound ◽  
Upper Bound Analysis ◽  
Bound Analysis
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