Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of Materials Processing
Journal Basic Information
Journal DOI :
The Korean Society for Technology of Plasticity
Editor in Chief :
Volume & Issues
Volume 12, Issue 8 - Dec 2003
Volume 12, Issue 7 - Nov 2003
Volume 12, Issue 6 - Oct 2003
Volume 12, Issue 5 - Aug 2003
Volume 12, Issue 4 - Jul 2003
Volume 12, Issue 3 - Jun 2003
Volume 12, Issue 2 - Apr 2003
Volume 12, Issue 1 - Feb 2003
Selecting the target year
Computer Simulation of Nano Material Behavior using Molecular Dynamics
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 171~183
DOI : 10.5228/KSPP.2003.12.3.171
Analysis of Formability and Plastic Instability in Sheet Metals (I)
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 184~193
DOI : 10.5228/KSPP.2003.12.3.184
Automatic Quadrilateral Mesh Generation for Large Deformation Finite Element Analysis
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 194~201
DOI : 10.5228/KSPP.2003.12.3.194
An automatic quadrilateral mesh generator for large deformation finite element analysis such as metal forming simulation was developed. The NURBS interpolation method is used for modeling arbitrary 2-D free surface. This mesh generation technique is the modified paving algorithm, which is an advancing front technique with element-by-element resolving method for paving boundary intersection problem. The mesh density for higher analysis accuracy and less analysis time can be easily controlled with high-density points, maximum and minimum element size. A couple of application to large deformation finite element analysis is given as an example, which shows versatility and applicability of the proposed approach and the developed mesh generator for large deformation finite element analysis.
Development of Finite Element Program for Analyzing Springback Phenomena of Non-isothermal Forming Processes for Aluminum Alloy Sheets(Part 1 : Experiment)
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 202~207
DOI : 10.5228/KSPP.2003.12.3.202
In order to examine the springback amount and material properties of aluminum alloy sheets (AL1050 and AL5052) in the warm forming which forms the sheet above the room temperature, the stretch bending and draw bending tests and tensile test in various high temperatures are carried out. The warm forming temperature 15
is a transition in terms of the material properties: over the forming temperature 15
, E, K, n, etc. are bigger but
and plastic strain ratio are smaller. Below the forming temperature 15
, there are no big differences in material properties as the forming temperature changes. AL5052 sheet has more springback effect than AL1050 sheet. While the springbacks of AL5052 and AL1050 sheets show a big reduction over the warm forming temperature 15
in the stretch bending test, the springback rapidly reduces in the warm forming temperature 15
for AL5052 sheet and 20
for AL1050 sheet in the draw bending test.
Initial Blank Design Considering Springback Reduction
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 208~213
DOI : 10.5228/KSPP.2003.12.3.208
The methodology to design initial blanks considering the reduction of both springback and flange trimming amounts is studied. Three dimensional forming analysis of a trial blank Is first carried out using FEM and the tentative Initial blank shape is then determined by cutting the outer edge of the trial blank whose shape is nearly matched with the trimming line. During the shaping the blank edge, tile movement of blank outer line is described with random variables to reduce the sensitivity of initial blank geometry. After performing 2-D FEM forming and springback simulations for selected sections and optimizing the trimming and springback amounts in terms of section length of the blank, the initial blank is finally determined. In order to see tile springback reduction in the initial blank determined by the proposed method, a stepped s-rail is stamped and the sppingback is measured. The springback of newly designed initial blank of stopped s-tail is tremendously reduced.
Die Stress and Process Analysis for Condenser Tube Extrusion according to Chamber Height
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 214~220
DOI : 10.5228/KSPP.2003.12.3.214
In the case of hollow cylinder extrusion using porthole die, the effects of extrusion parameters-temperature, the speed of extrusion, the shape of the die and mandrel-on metal flow in porthole die extrusion of aluminum have been investigated. There have been few studies about condenser tube extruded by porthole die. This study was designed to evaluate metal flow, welding pressure, extrusion load, tendency of mandrel deflection according to variation of chamber length in porthole die. The welding chamber height in condenser tube was calculated by using finite element method. Forming analysis results for condenser tube would provide useful information for the optimal design of porthole die.
A Study on the Distortion induced by Heat Treatment on Automobile Bevel Gears
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 221~227
DOI : 10.5228/KSPP.2003.12.3.221
Heat treatment is widely used in various manufacturing Processes to enhance the quality of a Product such as strength, surface hardness, and service life. In the heat treatment, there is dimensional change or distortion of the product, which critically influences the dimensional accuracy of precision parts. In this study, the distortion of a straight bevel gear induced by heat treatment is investigated in two cases. In the first case, the distortion induced by heat treatment we compared between a forged bevel gear and a machined bevel gear. In the second case, the distortion of an annealed gen is compared with that of a quenched gear. And finite element analysis has been Performed to predict the distortion of a heat-treated and machined bevel gear. The predicted values are compared with the experimental values.
The Forming Limit of Flange in the Radial Extrusion
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 228~235
DOI : 10.5228/KSPP.2003.12.3.228
In this paper, the workability of flange in the radial extrusion is analyzed in terms of the deformation pattern, the punch load and the forming limit by using simulation and experiment. A single action pressing is applied to both simulation and experiment. The analysis in this study is focused on the transient extrusion into the gap in radial direction with various gap heights and die corner radius. Based on the surface strains where surface cracking occurs, the forming patterns and strain-fracture relationships in producing radially extruded flange are obtained.
Effect of Friction on Springback in Channel Forming
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 236~243
DOI : 10.5228/KSPP.2003.12.3.236
Maintaining the required dimensional accuracy after springback becomes the main concern of sheet-forming die designers when formability is secured through beforehand tryouts. As a part to build guidelines for springback control in automobile frame forming, experiments are carried out to show the effects of process parameters, such as holding force, blank size, and lubrication, on corner angles of channels formed by U-bending or by square-cup drawing and trimming. The results predicted by a commercial FE package were compared with the experiment and the current limitations on springback evaluation were closely discussed.
Development of Deformation Texture in Aluminum Sheets during Asymmetrical Rolling with a Roll Speed Ratio of 1.5/l.0
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 244~250
DOI : 10.5228/KSPP.2003.12.3.244
Sheets of aluminum alloy 1100 were asymmetrically cold rolled in a rolling mill with different roll speeds. In order to promote the shear deformation during asymmetrical rolling, cold rolling without lubrication was performed with a roll speed ratio of 1.5/l.0. The evolution of texture components during asymmetrical rolling was investigated by the calculation of the orientation distribution function (ODF) using the monoclinic sample symmetry. The strain state during asymmetrical rolling was tackled by means of FEM calculations. Asymmetrical rolling gave rise to the development of pronounced strain gradients throughout the thickness layers which resulted in the formation of strong texture gradients in the aluminum sheet.
Material Flow and Surface Expansion in Radial-Backward Extrusion
Transactions of Materials Processing, volume 12, issue 3, 2003, Pages 251~258
DOI : 10.5228/KSPP.2003.12.3.251
The paper deals with an analysis of an extrusion process with a divided material flow in a combined radial - backward extrusion. The paper discusses the influences of tool geometry such as punch nose angle, relative gap height, die comer radius on material flow and surface expansion into can and flange region. To analyze the process, numerical simulations by the FEM and experiment, an Al alloy as a model material have been performed. Based on the results, the influence of design parameters on the distribution of divided material flow and surface expansion are obtained.