Closed die forging analysis of polycarbonate using an upper bound approach

1989 ◽  
Vol 31 (4) ◽  
pp. 265-283
Author(s):  
R. Fox ◽  
D. Lee
Keyword(s):  
Upper Bound ◽  
Die Forging ◽  
Closed Die Forging

An upper-bound analysis of the closed-die forging of spur gears

1997 ◽  
Vol 67 (1-3) ◽  
pp. 83-88 ◽  
Author(s):  
Haeyong Cho ◽  
Jaechan Choi ◽  
Gyusik Min ◽  
Young Choi ◽  
Jongung Choi
Keyword(s):  
Upper Bound ◽  
Spur Gears ◽  
Upper Bound Analysis ◽  
Die Forging ◽  
Closed Die Forging ◽  
Bound Analysis

Three-Dimensional Analysis of Closed-Die Forging Processes Part 2: Applications

1989 ◽  
Vol 203 (1) ◽  
pp. 38-42 ◽  
Author(s):  
C F Lugora ◽  
A N Bramley
Keyword(s):  
Dimensional Analysis ◽  
Upper Bound ◽  
Reasonable Agreement ◽  
Three Dimensional ◽  
Die Forging ◽  
Closed Die Forging ◽  
Forging Load

A generalized procedure for the analysis of three-dimensional forging problems has been proposed using the upper bound elemental technique. This analysis allows the subdivision of a forging into elementary simple regions. In this second part of the series, the model is applied to predict forging load in a selected category of closed-die forging processes. Experiments are carried out and a reasonable agreement with theory is found.

Closed-Die Forging of Gear-Like Elements

1998 ◽  
Vol 120 (1) ◽  
pp. 34-41 ◽  
Author(s):  
A. El-Domiaty ◽  
M. Shabara ◽  
M. Al-Ansary
Keyword(s):  
Upper Bound ◽  
Pure Aluminum ◽  
Experimental Results ◽  
Frictional Stress ◽  
Die Geometry ◽  
Die Forging ◽  
Closed Die Forging ◽  
Theoretical Predictions ◽  
Upper Bound Technique ◽  
Forging Die

Closed die forging of spur gears is investigated using the slab method and the upper bound technique. The tooth regions are approximated by prismatic rectangular sections. The velocity field comprising three unit deformation regions is used. A constant frictional stress between workpiece and forging die is assumed. The average punch pressure normalized by the flow stress of the gear material is determined theoretically and compared with experimental results. The experimental work is carried out on a commercial pure aluminum (Al 1100) at room temperature. The forging process is carried out using one die geometry without using any additional blocker (preform) dies. The theoretical predictions of forging pressures using slab and upper bound methods agree fairly well with the experimental results.

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.

Slip Line Field Analysis of a Simple Plane Strain Closed-Die Forging

1989 ◽  
Vol 203 (2) ◽  
pp. 91-99
Author(s):  
M V Srinivas ◽  
P Alva ◽  
S K Biswas
Keyword(s):  
Velocity Field ◽  
Plane Strain ◽  
Slip Line ◽  
Field Analysis ◽  
Line Field ◽  
Slip Line Field ◽  
Die Forging ◽  
Closed Die Forging ◽  
Cavity Filling ◽  
Single Cavity

A slip line field is proposed for symmetrical single-cavity closed-die forging by rough dies. A compatible velocity field is shown to exist. Experiments were conducted using lead workpiece and rough dies. Experimentally observed flow and load were used to validate the proposed slip line field. The slip line field was used to simulate the process in the computer with the objective of studying the influence of flash geometry on cavity filling.

Sign in / Sign up

Export Citation Format

Share Document