Development of a more realistic upper bound solution for the three-dimensional problems in the forward extrusion process

2013 ◽  
Vol 74 ◽  
pp. 112-119 ◽  
Author(s):  
P. Karami ◽  
K. Abrinia
Keyword(s):  
Upper Bound ◽  
Three Dimensional ◽  
Extrusion Process ◽  
Bound Solution ◽  
Forward Extrusion ◽  
Upper Bound Solution

An upper bound solution for twist extrusion process

2014 ◽  
Vol 20 (5) ◽  
pp. 825-834 ◽  
Author(s):  
M. Seyed Salehi ◽  
N. Anjabin ◽  
H. S. Kim
Keyword(s):  
Upper Bound ◽  
Extrusion Process ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Twist Extrusion

The Upper-Bound Solution as Applied to Three-Dimensional Extrusion and Piercing Problems

1962 ◽  
Vol 84 (4) ◽  
pp. 397-404 ◽  
Author(s):  
C. T. Yang
Keyword(s):  
Experimental Data ◽  
Upper Bound ◽  
Close Agreement ◽  
Three Dimensional ◽  
Slight Modification ◽  
Graphical Solution ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Region Approach ◽  
Good Agreement

The upper-bound solution for plane-strain problems is modified and applied to three-dimensional extrusion and piercing. Johnson’s graphical solution is used to solve axisymmetric, eccentric, and two-bar extrusion problems of a lead billet. Kudo’s unit-deforming region approach is employed to solve cylindrical piercing problems of six nonferrous metals. The analytical extrusion pressure is compared with Frisch and Thomsen’s experimental data. A reasonably close agreement is obtained in the first two cases. The calculated piercing pressure is compared with the experimental results of Fukui, et al. A remarkably good agreement is observed for all six cases. Therefore the upper-bound solution after slight modification can be extended to three-dimensional problems in extrusion and piercing. A general conclusion for extending the upper-bound approach to all forming operations cannot be drawn until further study is done along this line.

A Control Strategy and Upper Bound Solution for Non-Flat Tool Open Die Forging Automation

1999 ◽  
Author(s):  
T. J. Nye
Keyword(s):  
Control Strategy ◽  
Upper Bound ◽  
Sequence Generation ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Die Forging ◽  
Strategy Model ◽  
Model Predictions ◽  
Open Die Forging ◽  
Good Agreement

Abstract The open die forging process can provide a number of benefits if its costs can be made competitive through automation. This paper describes a control strategy for automated open die forging forming sequence generation. An upper bound solution for forging with radiused tools is developed, along with a method for using this solution to estimate forming results, a necessary component of the control strategy. Model predictions are compared to physical experimental data using plasticine, and show good agreement.

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