Three-Dimensional Analysis of Closed-Die Forging Processes: Part 1: Formulation

1989 ◽  
Vol 203 (1) ◽  
pp. 33-37 ◽  
Author(s):  
C F Lugora ◽  
A N Bramley
Keyword(s):  
Theoretical Model ◽  
Energy Dissipation ◽  
Metal Flow ◽  
Three Dimensional ◽  
Total Rate ◽  
Die Forging ◽  
Closed Die Forging ◽  
Proposed Model ◽  
Optimum Velocity ◽  
Forging Load

In this series of papers, a theoretical model based on the upper bound elemental technique is presented for prediction of forging load and metal flow in three-dimensional closed-die forging processes. Three basic elements are introduced in order to partition a forging into simple elementary regions. An optimum velocity distribution within the forging is obtained by minimizing the total rate of energy dissipation using a simplex optimizing procedure. Applications of the proposed model are discussed in Part 2.

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.

Application of Numerical Simulation in Closed-Die Forging Forming for Universal Joint Fork

2013 ◽  
Vol 441 ◽  
pp. 435-438
Author(s):  
Jin Yang ◽  
Ping Wang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Metal Flow ◽  
Dimensional Accuracy ◽  
Element Model ◽  
Universal Joint ◽  
Forming Load ◽  
Die Forging ◽  
Die Life ◽  
Closed Die Forging

A universal joint fork is one of the key parts of the automotive and tractor drive shaft system, which needs high requirements in dimensional accuracy and product quality. In this study, the numerical simulation analysis of closed-die forging of the universal joint fork was carried out using the rigid-visco-plastic finite element model. In view of formation, heat transfer and heating generation coupled, the variation rules of forming load, stress field and strain field were obtained. The numerical simulation results show that good process parameters conditions can effectively control forming load, enhance metal flow and improve die life.

A Theoretical Model For Predicting The Surface Topography of Inhomogeneous Materials After Shot Peening

2021 ◽  
Author(s):  
BingBing Wang ◽  
HaiKuan Chen ◽  
GuangTao Xu ◽  
JianWei Zhang ◽  
MingHao Zhao
Keyword(s):  
Theoretical Model ◽  
Surface Topography ◽  
Shot Peening ◽  
Three Dimensional ◽  
Contact Theory ◽  
Finite Element Models ◽  
Single Shot ◽  
Inhomogeneous Materials ◽  
Proposed Model ◽  
Multiple Shot

Abstract Shot peening is widely used in engineering as a classical strengthening process. Although many studies on shot peening have been done, most have focused on homogeneous target materials. In this paper, a theoretical model is proposed for predicting the surface morphology of inhomogeneous target materials. The topography of target materials after single-shot impact is calculated on the basis of energy conservation and Hertz contact theory, and the final three-dimensional surface topography after multiple-shot impact is obtained through superposition. Single-shot and random multiple-shot finite element models are used to show the advantages of the proposed model over the existing theoretical model for homogeneous target materials. The roughness is found to increase with the shot velocity and shot radius.

Modeling of Closed-Die Forging for Estimating Forging Load

2016 ◽  
Vol 98 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Debashish Sheth ◽  
Santanu Das ◽  
Avik Chatterjee ◽  
Anirban Bhattacharya
Keyword(s):  
Die Forging ◽  
Closed Die Forging ◽  
Forging Load

The Dynamics of Closed-Die Forging With Mechanical Presses

1995 ◽  
Vol 117 (3) ◽  
pp. 357-364 ◽  
Author(s):  
R. F. Scrutton ◽  
A. Marasco
Keyword(s):  
Published Data ◽  
Die Forging ◽  
Closed Die Forging ◽  
Theoretical Results ◽  
Crank Mechanism ◽  
Forging Load

The kinetic energies of the crank mechanism and anvil and flash material are considered in order to develop a relation between forging load and the velocity of the upper die. Theoretical results are compared with published data. The dynamics of flash formation are also considered. When a larger flywheel is used, forging loads may be calculated in terms of the changes in energy of the flywheel. Hence, the ratio of press capacity to forging load is an important factor in the mechanics of forging.

A Liquid Metal Flow Between Two Coaxial Cylinders System

2019 ◽  
Vol 11 (1) ◽  
pp. 79-86
Author(s):  
Abdelkrim Merah ◽  
Ridha Kelaiaia ◽  
Faiza Mokhtari
Keyword(s):  
Couette Flow ◽  
Metal Flow ◽  
Three Dimensional ◽  
Liquid Sodium ◽  
Taylor Vortex ◽  
Turbulent Regime ◽  
Coaxial Cylinders ◽  
Concentric Cylinders ◽  
Ideal Tool ◽  
The Stability

Abstract The Taylor-Couette flow between two rotating coaxial cylinders remains an ideal tool for understanding the mechanism of the transition from laminar to turbulent regime in rotating flow for the scientific community. We present for different Taylor numbers a set of three-dimensional numerical investigations of the stability and transition from Couette flow to Taylor vortex regime of a viscous incompressible fluid (liquid sodium) between two concentric cylinders with the inner one rotating and the outer one at rest. We seek the onset of the first instability and we compare the obtained results for different velocity rates. We calculate the corresponding Taylor number in order to show its effect on flow patterns and pressure field.

Sign in / Sign up

Export Citation Format

Share Document