scholarly journals Numerical and Experimental Investigation on the Effect of Billet Preforming in the Flange Forming

2018 ◽  
Vol 7 (4.7) ◽  
pp. 188
Author(s):  
Abdullah M.N ◽  
. .
Keyword(s):  
Finite Element ◽  
Effective Stress ◽  
Effective Strain ◽  
Three Dimensional ◽  
Maximum Principal Stress ◽  
Hydraulic Press ◽  
Filling Material ◽  
Cold Forming ◽  
Lead Metal ◽  
Flange Forming

Finite element method and experiments have been used to study a cold forming method for fabrication of a flange using the effect of billet preforming. Three dimensional finite element methods carried out to obtain the forming load, die filling, material flow,  effective stress, effective strain  with DEFORM-3D software, and a series of experimental works has been performed using lead metal with four types of  billet preforming in the first stage. Pressing process has been done using computerized hydraulic press machine with 100 tons. The forming sequence is carried out in two stages. In the first stage, the cylindrical billet is preformed by upsetting and in the second stage forming it in a die. Results indicate that the process of formation is influenced by preforming of billet with fixed volume in the final stage of pressing, improve the mechanical properties of the metal and thus facilitates the final deformation process with less stress and better flow of the metal inside the die. Simulation results show that the effective stress, maximum principal stress, effective strain, velocity and damage are maximum at locations where flange open out and rib growth begins across the geometrical interlocking between the two halves of die-set and the component surface.  

The Extrusion Behavior of AZ31 Mg Alloys by Finite Element Simulation

2014 ◽  
Vol 906 ◽  
pp. 285-288
Author(s):  
Ping Li ◽  
Shou Ren Wang ◽  
Yong Wang ◽  
Guang Ji Xue
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Effective Stress ◽  
Effective Strain ◽  
Three Dimensional ◽  
Stress And Strain ◽  
Technical Parameters ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Extrusion Forming

The three-dimensional finite element (FE) numerical simulation of extrusion forming of AZ31 matrix magnesium alloy was analyzed in four extrusion velocities. The flow pattern and the influence of extrusion velocity for the temperature, the distribution of effective stress and strain of composites were analyzed. The results showed that, when the extrusion velocity increased from 1.5 mm/s to 4.5 mm/s, the heat flux under steady extrusion state would change from-2.77e+004 (Wm2) to 1.14e+005 (Wm2), meanwhile the effective stress and strain increased at first and then decreased, and the average effective strain and stress value were smallest when v = 4.5 mm/s. It showed that along with the increase of the extrusion velocity, the rise degree of the temperature increased and the distribution of the effective stress and strain tended to be more evenly. Finally, the best extrusion technical parameters of AZ31 magnesium alloy were determined, that was the extrusion velocity was equal to 4.5 mm/s when extrusion ratio was 25 and extrusion temperature was 350 °C.

scholarly journals A 3-D Finite Element Study of the Influence of Crown-Implant Ratio on Stress Distribution

2013 ◽  
Vol 24 (6) ◽  
pp. 635-641 ◽  
Author(s):  
Sandra Lucia Dantas de Moraes ◽  
Fellippo Ramos Verri ◽  
Joel Ferreira Santiago Junior ◽  
Daniel Augusto de Faria Almeida ◽  
Caroline Cantieri de Mello ◽  
...  
Keyword(s):  
Finite Element ◽  
Bone Tissue ◽  
Three Dimensional ◽  
Maximum Principal Stress ◽  
Von Mises Stress ◽  
Bone Block ◽  
Crown Height ◽  
Oblique Loading ◽  
Von Mises ◽  
Three Dimensional Finite Element

The purpose of this study was to assess the influence of the crown height of external hexagon implants on the displacement and distribution of stress to the implant/bone system, using the three-dimensional finite element method. The InVesalius and Rhinoceros 4.0 softwares were used to generate the bone model by computed tomography. Each model was composed of a bone block with one implant (3.75x10.0 mm) with external hexagon connections and crowns with 10 mm, 12.5 mm and 15 mm in height. A 200 N axial and a 100 N oblique (45°) load were applied. The models were solved by the NeiNastran 9.0 and Femap 10.0 softwares to obtain the results that were visualized by maps of displacement, von Mises stress (crown/implant) and maximum principal stress (bone). The crown height under axial load did not influence the stress displacement and concentration, while the oblique loading increased these factors. The highest stress was observed in the neck of the implant screw on the side opposite to the loading. This stress was also transferred to the crown/platform/bone interface. The results of this study suggest that the increase in crown height enhanced stress concentration at the implant/bone tissue and increased displacement in the bone tissue, mainly under oblique loading.

Design Analysis of a Twin Head Horizontal Hydraulic Press

1992 ◽  
Vol 114 (3) ◽  
pp. 289-293
Author(s):  
U. P. Singh ◽  
P. P. Miller
Keyword(s):  
Finite Element ◽  
Torsional Rigidity ◽  
Three Dimensional ◽  
Element Model ◽  
Hydraulic Press ◽  
Design Analysis ◽  
Assembly Work ◽  
The Press ◽  
And Performance ◽  
Three Dimensional Finite Element

Because of economical reasons, use of the single or multi-head hydraulic press is finding popularity in recent times in assembly work for automotive parts in particular. As this type of press offers opportunity for large parts to be assembled with ease, their design and performance poses complexity and challenge to press designers in regard to the high precision required by assembly work. This paper deals with the design analysis of a twin head horizontal press using the finite element method. The three-dimensional finite element model, developed for the press, gives quantitative results useful to press designers. Some suggestions are made to improve the stiffness and torsional rigidity of the press.

Finite Element Analysis on Frame-Type Hydraulic Press

2011 ◽  
Vol 199-200 ◽  
pp. 1623-1628 ◽  
Author(s):  
Da Sen Bi ◽  
Dan Dan Liu ◽  
Liang Chu ◽  
Jian Zhang
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Manufacturing Industry ◽  
Effective Strain ◽  
Work Load ◽  
Hydraulic Press ◽  
Element Analysis ◽  
Maximum Value ◽  
Wide Range ◽  
Cylinder Port

Hydraulic press is important pressure processing equipment, which has a wide range of applications in production and manufacturing industry. The structure of hydraulic press frame has an extremely significant effect on safety and usability. Against the structure of frame-type hydraulic press in this paper, a solid model has been built with CAD program Pro/E and the hydraulic press frame under working conditions is simulated by finite element simulation program ANSYS. This paper analyses the variation of stress, strain and frame deformation under working conditions, and the dangerous sections of hydraulic press frame can be found under the maximum work load. The research results show: The maximum value of effective strain and effective stress can be found in the screw holes of cylinder port, the maximum value of stress and strain in the direction of hydrocylinder force can be found in the confluence of upright column and lower beam, the maximum value of effective displacement and the displacement in the direction of hydrocylinder force can be found in cylinder port and part of upper beam.

Finite Element Static Analysis of YP2080 Automatic Hydraulic Press

2014 ◽  
Vol 556-562 ◽  
pp. 1046-1049
Author(s):  
Dong Qing Lv
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Three Dimensional ◽  
Hydraulic Press ◽  
Stress And Strain ◽  
Design And Optimization ◽  
Dimensional Models ◽  
Three Dimensional Models

The paper took 2080 tons automatic hydraulic tile press as the research object, completed the finite element static analysis of its beam and base. Established their three-dimensional models with CAD software Pro/ENGINEER, and then analyzed the stress and transfiguration with CAE software ANSYS. Studied the distribution of the stress and strain, and found their maximum and location. The result can provide some good reference for design and optimization.

scholarly journals Design features of a three-dimensional molar crown and related maximum principal stress. A finite element model study

2010 ◽  
Vol 26 (2) ◽  
pp. 156-163 ◽  
Author(s):  
Brian T. Rafferty ◽  
Malvin N. Janal ◽  
Ricardo A. Zavanelli ◽  
Nelson R.F.A. Silva ◽  
E. Dianne Rekow ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Principal Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Maximum Principal Stress ◽  
Design Features ◽  
Model Study

scholarly journals VOID EVOLUTION BEHAVIOR AND CLOSURE CRITERION INSIDE LARGE SHAFT FORGINGS DURING A FORGING PROCESS

2021 ◽  
Vol 55 (3) ◽  
Author(s):  
Yongxing Jiao ◽  
Cunlong Zhou ◽  
Jiansheng Liu ◽  
Xuezhong Zhang ◽  
Wenwu He
Keyword(s):  
Effective Stress ◽  
Shape Change ◽  
Effective Strain ◽  
Great Influence ◽  
Hydraulic Press ◽  
Stress Deviator ◽  
Void Closure ◽  
Forging Process ◽  
Void Shape ◽  
Simulation Results

In this study, the effects of different void positions, void shapes and sizes on the evolution of voids were discussed in detail using experiments and simulations. The results show that the influence of the void size on the void closure can be ignored, while the void position and void shape have a great influence on the closure of a void. Considering the complexity of the void-shape change in a forging process, we proposed a quantitative expression of the void-shape coefficient, which is affected by the effective stress and effective strain. Meanwhile, the void-shape evaluation parameter, defined as a function of the stress deviator, effective strain and effective stress, was proposed to describe the changes in the void aspect ratio. Finally, WHF (wide die heavy blow) forging experiments were conducted using a 5MN hydraulic press to verify the numerical-simulation results. Based on the experimental and simulation results, a new mathematical model for void-closure determination was established during a forging process of large shaft forgings. The experimental results were consistent with the simulation results, showing that the void-closure model can accurately determine whether a void is closed or not.

Nonlinear Finite Element Analysis of Spring-Back Characteristics in the Cold-Forming Process of Three-Dimensionally Curved Thick Metal Plates

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Jeom Kee Paik ◽  
Jeong Hwan Kim ◽  
Bong Ju Kim ◽  
Chang Hyo Tak
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Steel Plates ◽  
Research Centre ◽  
Spring Back ◽  
Forming Process ◽  
Element Analysis ◽  
Cold Forming ◽  
Metal Plates ◽  
National University

The present paper is part of the study to develop the advanced computer aided manufacture (CAM) system called the changeable die system (CDS) that applies the cold-forming technique to produce curved thick metal plates with complex, three-dimensional geometry [Paik et al., 2009, “Development of the Changeable Die System for the Cold-Forming of Three-Dimensionally Curved Metal Plates,” The Lloyd's Register Educational Trust Research Centre of Excellence, Pusan National University, Korea]. This paper focuses on the procedure of predicting the spring-back characteristics using elastic-plastic large deflection finite element method, which is a key technical element within the framework of the CDS process. The validity of the procedure is confirmed by comparison with experimental results obtained by the CDS machine in the cold-forming process of curved steel plates.

Simulation of Square-to-Oval Single Pass Rolling Using a Computationally Effective Finite and Slab Element Method

1992 ◽  
Vol 114 (3) ◽  
pp. 329-335 ◽  
Author(s):  
N. Kim ◽  
S. M. Lee ◽  
W. Shin ◽  
R. Shivpuri
Keyword(s):  
Finite Element ◽  
Plane Strain ◽  
Effective Strain ◽  
Rolling Direction ◽  
Three Dimensional ◽  
Computational Effort ◽  
Element Formulation ◽  
Single Pass ◽  
Dimensional Finite Element ◽  
Generalized Plane Strain

This paper presents details of a quasi three-dimensional finite element formulation for shape rolling, TASKS. This formulation uses a mix of two-dimensional finite element and slab element techniques to solve a generalized plane strain problem. Consequently, quasi steady state metal forming problems such as rolling of shapes can be analyzed with minimal computational effort. To verify the capability of the formulation square-to-round single pass rolling is simulated by TASKS and results compared with a fully three-dimensional simulation reported in literature. The results indicate reasonable agreement in roll forces, torques, and effective strain distributions during rolling. However, due to the generalized plane strain assumptions, nonhomogenieties in the rolling direction cannot be simulated. The large computational economy realized via TASKS gives this formulation the power to analyze roll pass designs with reasonable computational resources.

Numerical Analysis of Rolling Extrusion Process of a Hollow Hub / Analiza Numeryczna Procesu Przepychania Obrotowego Piasty Drążonej

2012 ◽  
Vol 57 (4) ◽  
pp. 1137-1142 ◽  
Author(s):  
J. Bartnicki
Keyword(s):  
Numerical Analysis ◽  
Effective Stress ◽  
Experimental Verification ◽  
Effective Strain ◽  
Metal Flow ◽  
Three Dimensional ◽  
Extrusion Process ◽  
Design Tools ◽  
Extruded Product ◽  
Deform 3D

This paper presents the results of numerical calculations of rolling extrusion process of a hollow hub. Simulations were made by means of software Deform 3D in three dimensional state of strain. Distributions of effective stress, effective strain and damage criterion in the rolled extruded product were analyzed. Verification of metal flow during process allowed to design tools for experimental verification in PO-2 laboratory rolling - extrusion aggregate. For these needs also process force parameters were calculated.

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