Study on Spring-Back Effect with Various Temperature of Magnesium Alloy in Roll Forming Process

2014 ◽  
Vol 1016 ◽  
pp. 75-79 ◽  
Author(s):  
Dong Hong Kim ◽  
Dae Hwan Yoon ◽  
Hao Yu ◽  
Dong Won Jung
Keyword(s):  
Magnesium Alloy ◽  
High Temperatures ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Roll Forming ◽  
Spring Back ◽  
Forming Process ◽  
Explicit Finite Element ◽  
Back Angle ◽  
Roll Forming Process

AZ31 magnesium alloy sheets are usually performed at high temperatures of 200 to 250°C due to their unusual hexagonal close-packed structure and low ductility at room temperature. In this study, to predict the spring-back of AZ31 magnesium alloy sheets in a roll forming process subjected to high temperatures, so the spring-back phenomenon consider in various temperature using an explicit finite element code. Finally, the roll forming process for a magnesium alloy sheet at high temperatures was performed to verify the spring-back angle, which was then compared with the spring-back angle predictions of the FE simulation.

418 Cold roll forming process of wrought magnesium alloy using finite element analysis

2014 ◽  
Vol 2014.22 (0) ◽  
pp. 163-164
Author(s):  
Shintaro AKANUMA ◽  
Tomoya SUZUKI ◽  
Hayato ASO ◽  
Bunkyo KYO ◽  
Shinichi NISHIDA ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnesium Alloy ◽  
Roll Forming ◽  
Cold Roll Forming ◽  
Forming Process ◽  
Element Analysis ◽  
Cold Roll ◽  
Wrought Magnesium Alloy ◽  
Roll Forming Process

Investigation on Variation of Bow Defect in Roll Forming Process

2017 ◽  
Vol 729 ◽  
pp. 80-85
Author(s):  
Dong Won Jung
Keyword(s):  
Steel Strip ◽  
Sheet Thickness ◽  
Roll Forming ◽  
Spring Back ◽  
Forming Process ◽  
Complex Deformation ◽  
Plastic Forming ◽  
Set Up ◽  
Roll Forming Process ◽  
Abaqus Software

Roll forming is a kind of plastic forming process in which a steel strip is bent by several sets of rolls gradually into the desired shape. The products are cold roll forming steels with various sections. Roll forming is one of the most widely used processes in the world for forming metal. Roll forming is a complex deformation process, which involves large displacement, finite strain and the problems of contact and friction between strip and rolls. This process exhibits obvious geometry, physical and boundary nonliterary. The complex processes contain many aspects such as geometry, kinematics and dynamics, etc. The forming process involves not only transverse bending, but also other additional deformations. In this paper, a group of simulations have been established with ABAQUS software to studying about the spring back and bow defect in the roll forming process. At last, experiments have been accomplished to verify the simulation results. The simulations based on the ABAQUS software calculate the spring back angles and bow displacements. The bow displacement of the roll forming process is considered relate to many factors include inner distance between stands, gaps of the rolls, channel width, the material of the sheet, sheet thickness and so on.To verify the bow displacement in roll forming process, 9 groups of simulations were set up use Taguchi method to figure out the influence on bow displacement of every factor. The longitudinal strain also has been learned in the present study.

Study on Spring-Back Effect according to Roll Gap and Forming Velocity of Roll Forming Process

2016 ◽  
Vol 33 (6) ◽  
pp. 477-483
Author(s):  
Dong Hong Kim ◽  
Dae-Hwan Yoon ◽  
Sang-Seok Seol ◽  
Dong Won Jung
Keyword(s):  
Roll Forming ◽  
Spring Back ◽  
Forming Process ◽  
Roll Gap ◽  
Roll Forming Process

A Study on the Development of Dedicated FEA Tool for Roll Forming of Asymmetrical U-Channel

2012 ◽  
Vol 445 ◽  
pp. 73-78
Author(s):  
Wan Gi Cha ◽  
Hong Lae Kim ◽  
Nak Soo Kim
Keyword(s):  
Augmented Lagrangian ◽  
Roll Forming ◽  
Spring Back ◽  
Forming Process ◽  
Deformation Region ◽  
Contact Algorithm ◽  
Computation Efficiency ◽  
Region Division ◽  
Continuous Bending ◽  
Roll Forming Process

In a roll forming process, a desired profile is produced through continuous bending of a sheet metal strip. Occurrences of spring back, twist, and bow are major defects in roll formed profiles. We developed a dedicated analysis program based on the elastic-plastic finite element method to simulate roll forming processes with asymmetrical shaped rolls. We applied the augmented Lagrangian technique in contact algorithm and a pre-determined deformation region division method for computation efficiency. A simplified cross section produced via three passes of roll forming has been experimented to be measured in the amounts of twist and bow occurred after roll forming. The performance of the developed FEA tool has been verified with measurements in terms of accuracy. The tool has been evaluated in terms of computation efficiency by comparison of without region division method.

Study on the Spring-Back Effect with Stress Distribution According to Forming Sheet Width in the Roll Forming Process

2015 ◽  
Vol 789-790 ◽  
pp. 116-120
Author(s):  
Dong Hong Kim ◽  
Hao Yu ◽  
Dong Won Jung
Keyword(s):  
Stress Distribution ◽  
Roll Forming ◽  
Spring Back ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Simulation ◽  
Sheet Width ◽  
Simulation Results ◽  
The Relationship ◽  
Roll Forming Process

This study, based on finite element analysis, analyzed the spring back phenomenon and stress distribution of forming sheets (HTS) in the roll forming process. By comparison of the stress distribution, this study analyzed two kinds of simulation. The first simulation performed simple bending simulation before roll forming simulation. With reference to the first simulation results, the second simulation analyzed the relationship between the stress distribution and the phenomenon of spring back. We also studied the stress distribution effect for spring back in the forming sheet.

A New Engineering Technique in Roller Design to Prevent Thinning of Sheet in Roll Forming Process

2017 ◽  
Vol 873 ◽  
pp. 42-47
Author(s):  
Dong Won Jung
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Metal Sheet ◽  
Roll Forming ◽  
Forming Process ◽  
Explicit Finite Element ◽  
Main Challenge ◽  
Engineering Technique ◽  
Roll Forming Process

These days sheet metal forming is a widely used in different industrial fields with large production volumes. Formability of metal sheets is limited by localized necking and plastic instability. In sheet metal forming processes like drawing and stamping the main challenge is thinning of the metal sheet in some regions. To reduce thinning of the sheet product, roll forming has been suggested instead of stamping process. Thinning strain can cause necking, tearing or wrinkling which are failure of the metal sheet. In this study a new engineering technique is proposed in order to prevent thinning of the steel galvanized hot coil commercial (SGHC) in roll forming process. An explicit finite element code, ABAQUS software, was used to simulate the roll forming process. The results show that the proposed technique has an important effect on thinning of the sheet and can reduce it significantly. Investigation on the second and third and fourth rollers show the effect of modified roller dimension as on reducing the thickness. These reductions in second, third and fourth rollers are from 4 percent to 0.5 percent, 2.8 to 1.4 percent and from 1.4 to 0.7 percent respectively. The reasons of the new techniques effect were also discussed.

Sign in / Sign up

Export Citation Format

Share Document