A Study of Preform Design on Backward Extrusion for Improved Hardness Distribution

2012 ◽  
Vol 445 ◽  
pp. 247-252
Author(s):  
Chin Tarn Kwan ◽  
Zhi Kai Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Distribution ◽  
Effective Strain ◽  
Strain Curve ◽  
Preform Design ◽  
Hardness Distribution ◽  
The Finite Element Method ◽  
Backward Extrusion ◽  
Deform 2D

In this paper, the finite element method is used to investigate the effect of preform shapes on the strain hardening distribution in the wall of the extruded cup of backward extrusion. A series of simulations on the backward extrusion with three different preform shapes (flat, concave and convex) and without preform using the FEM program DEFORM 2D was carried out, respectively. The influence of preform shapes on the effective strain distribution in the extruded wall was examined. A hardness vs. effective strain curve for an annealed AL6061 Aluminum was first obtained using a simple forging test in conjunction with FE simulations, then the curve was used to convert the effective strain distribution into the hardness distribution in the extruded wall. The results of FEM calculations reveal that the concave shape preform has the best effect on the hardness strengthening at the extruded wall of backward extrusion.

Analytic Calculation About the Strain Distribution of Any-Shaped Self-Organized Quantum Dot

2007 ◽  
Author(s):  
Yumin Liu ◽  
Zhongyuan Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Quantum Dot ◽  
Function Approximation ◽  
Strain Distribution ◽  
Function Technique ◽  
Plane Wave Expansion ◽  
The Finite Element Method ◽  
Self Organized ◽  
Element Method

The strain distribution of quantum dots is analytically calculated using the Green’s function technique; the general expressions for any shaped quantum dot are derived. As examples, this method is applied to cube, pyramid column, and taper-shaped quantum dot. Our expressions are correct comparing with the calculated results by finite element method and finite difference. This approach is very powerful and can be applied to any-shaped quantum dot, especially this method can directly used in the calculation of electronic structure of quantum dot by the envelop function approximation or plane wave expansion methods, because the analytic expression can exactly calculate the strain at any position. In the paper, we give the strain distribution of four types of shaped quantum dot, and some comparisons are given with the results calculated by the finite element method.

Study on Internal Helical Gear Worm Forging by Finite Element Analysis

2013 ◽  
Vol 465-466 ◽  
pp. 1361-1364
Author(s):  
Tung Sheng Yang ◽  
Jia Yu Deng ◽  
Jie Chang
Keyword(s):  
Finite Element ◽  
Strain Distribution ◽  
Effective Strain ◽  
Helical Gear ◽  
The Finite Element Method ◽  
Forming Force ◽  
Element Analysis ◽  
Power Requirement ◽  
Warm Forging ◽  
Forging Load

This study applies the finite element method (FEM) to predict maximum forging load and effective strain in internal helical gear forging. Maximum forging load and effective strain are determined for different process parameters, such as modules, number of teeth, and die temperature of the internal helical gear forging, using the FEM. Finally, the prediction of the power requirement for the internal helical gear warm forging is determined. Therefore, the maximum forming force and strain distribution will be prediction for the different parameters of helical gear worm forging.

scholarly journals Influence of elongation factor on distributions of effective strain and flow stress for pushing through a conical die process of round bars made from S355 steel

2019 ◽  
Vol 252 ◽  
pp. 05004
Author(s):  
Tomasz Miłek
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Stress ◽  
Computer Modelling ◽  
Effective Strain ◽  
Elongation Factor ◽  
The Finite Element Method ◽  
Elongation Factors ◽  
Conical Die ◽  
Commercial Code

The paper presents computer modelling results of researches on pushing through a conical die process of round bars. Calculations were carried out using the commercial code QFORM-2D, based on the Finite Element Method (FEM). Investigations involved the use of circular sectioned S355 (1.0577) steel segments of rods with diameter of 9 mm and conical dies with different diameter of sizing portion of a die (d = 7.1 mm; 7.6 mm and 8.0 mm). The aim of the paper is to compare distributions of effective strain and flow stress in longitudinal sections of round bars at different elongation factors (λ1 = 1.24, λ2 = 1.37 and λ3 = 1.57).

Study on Bevel Gear Worm Forging by Finite Element Analysis

2013 ◽  
Vol 479-480 ◽  
pp. 369-372
Author(s):  
Tung Sheng Yang ◽  
Li Hong Lai ◽  
Ji Hong Deng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Effective Strain ◽  
Bevel Gear ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Power Requirement ◽  
Die Temperature ◽  
Warm Forging ◽  
Forging Load

This study applies the finite element method (FEM) to predict maximum forging load and effective strain in bevel gear forging. Maximum forging load and effective strain are determined for different process parameters, such as modules, number of teeth, and die temperature of the bevel gear forging, using the FEM. Finally, the prediction of the power requirement for the bevel gear warm forging is determined.

Study on Helical-Bevel Gear Worm Forging by Finite Element Analysis

2013 ◽  
Vol 753-755 ◽  
pp. 253-256 ◽  
Author(s):  
Tung Sheng Yang ◽  
Cheng Chang ◽  
Sheng Yi Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Effective Strain ◽  
Bevel Gear ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Power Requirement ◽  
Die Temperature ◽  
Warm Forging ◽  
Forging Load

This study applies the finite element method (FEM) to predict maximum forging load and effective strain in helical-bevel gear forging. Maximum forging load and effective strain are determined for different process parameters, such as modules, number of teeth, and die temperature of the helical bevel gear forging, using the FEM. Finally, the prediction of the power requirement for the helical-bevel gear warm forging is determined.

Finite Element Analysis of the Temperature Field and Strain Field of Coating Rod in Friction Surfacing

2010 ◽  
Vol 97-101 ◽  
pp. 1433-1437
Author(s):  
Xue Mei Liu ◽  
Zeng Da Zou ◽  
Xin Hong Wang ◽  
Shi Yao Qu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Strain Field ◽  
Radial Direction ◽  
Effective Strain ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Friction Surfacing ◽  
Simulation Results

In friction surfacing process, the temperature field and strain field, especially of coating rod, is considered an important element in analyzing the process’ mechanism and choosing the key process parameters properly. In this paper, the finite element method was employed to simulate the coupling of 3-D temperature field and deformation field of coating rod during friction surfacing. The simulation results show that at the preliminary preheating period, the isotherm goes down at the center part, and the temperature field presents “M” along the radial direction. The temperature increasing rate at the friction interface is higher at first, and then become lower, once the friction system becomes quasi-steady, the temperature here will be stable approximately. The largest effective strain occurs near the center of bottom circle. The simulation results are close to the experimental results, thus builds a basis for analyzing the process’s mechanism, allows for theoretical guidance for analyzing feasibility and helps optimize key parameters.

scholarly journals Effect of the Forming Zone Length on Helical Rolling Processes for Manufacturing Steel Balls

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2917 ◽  
Author(s):  
Andrzej Gontarz ◽  
Janusz Tomczak ◽  
Zbigniew Pater ◽  
Tomasz Bulzak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Effective Strain ◽  
Cost Effective ◽  
The Finite Element Method ◽  
Helical Rolling ◽  
Zone Length ◽  
Tool Service Life ◽  
Tool Service ◽  
Steel Balls

This paper begins with a brief overview of the methods for producing balls. It then discusses the rolling processes for producing balls in helical passes. Next, a method for designing tools for helical rolling (HR) is described. Six different cases of rolling using tools with helical passes of different lengths are modeled by the finite element method (FEM). The simulations are performed with the use of Simufact Forming version 13.3. Based on the 3D simulations, the distributions of effective strain, damage criterion, and temperature, as well as the variations in loads and torques, are determined. This study also predicts the rate and manner of wear of the helical tools, depending on the tool design. As a result, it has been found that an increased length of the helical forming passes is advantageous in terms of tool service life. It has also been found that excessive elongation of the forming zone is not cost-effective.

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