scholarly journals Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 390 ◽  
Author(s):  
Xiaohui Cui ◽  
Ang Xiao ◽  
Zhihao Du ◽  
Ziqin Yan ◽  
Hailiang Yu
Keyword(s):  
Magnetic Force ◽  
Sheet Thickness ◽  
Elastic Strain Energy ◽  
Simulation Method ◽  
Discharge Voltage ◽  
Magnetic Pulse ◽  
Technological Parameters ◽  
Blank Holder ◽  
Magnetic Pulse Forming ◽  
Production Environments

This study proposes an electromagnetic-assisted stamping (EMAS) method with magnetic-force loading at the sheet end in order to control the springback phenomenon. The new method does not change the structure of the mold and does not generate a magnetic force at the sheet corner compared to traditional EMAS. Thus, the new approach could greatly extend the mold lifespan and could be readily adopted in commercial production environments. The effects of technological parameters, such as the distance between the blank holder and die, discharge voltage, and sheet thickness on the springback phenomenon were analyzed. Our results suggest that tangential stress and elastic strain energy both decrease with the increase of discharge voltage. The simulation method accurately predicted the deformation of the sheet during the quasi-static stamping and dynamic magnetic forming processes. The simulation and experimental results both show that as the discharge voltage increases, the bent angle after springback decreases.

Advancements in the Simulation of Magnetic Pulse Forming Processes with FORGE®

2021 ◽  
pp. 1217-1230
Author(s):  
José Alves ◽  
François Bay ◽  
Ugo Ripert ◽  
Julien Barlier ◽  
Nicolas Poulain
Keyword(s):  
Magnetic Pulse ◽  
Magnetic Pulse Forming

Technology Development of Large-Size Bodies Manufacturing from Thick Plate Materials Based on Combined Methods of Deformation

2016 ◽  
Vol 685 ◽  
pp. 375-379 ◽  
Author(s):  
Alexander Pesin ◽  
Ernst Drigun ◽  
D.O. Pustovoytov ◽  
Ilya Pesin
Keyword(s):  
Thick Plate ◽  
Technology Development ◽  
Sheet Thickness ◽  
Technological Parameters ◽  
Asymmetric Rolling ◽  
Plastic Bending ◽  
Second Stage ◽  
Large Size ◽  
Third Stage ◽  
Three Stages

The main goal of the investigation is to determine key technological parameters, necessary for producing required curvature of sheets up to 4000 mm in width with the required mechanical properties. Investigation into dynamics of the process' main technological parameters allowed it to define its three characteristic stages: asymmetric rolling, asymmetric rolling in combination with initial unsettled plastic bending, and asymmetric rolling combined with settled plastic bending. It was found out that the intensity of the deformations changes unevenly, depending on the height of the deformation zone, on all three stages, with its highest value being in the lower part of the sheet, and with the lowest value being in its center. In the second stage, the intensity of the deformation abruptly increases, and a significant asymmetry on the sheet thickness occurs. In the third stage, the non-uniformity of the intensity deformations fields decreases. Similar results can be also observed for stress intensities. Casings on two converters were produced and installed in the oxygen-converter plant.

Optimization of Process Parameters of U-Shape Sheet Metal Based on Compensation of Geometric Springback Value

2012 ◽  
Vol 455-456 ◽  
pp. 1122-1127
Author(s):  
Xiang Wu Jia ◽  
Shu Gen Hu
Keyword(s):  
Sheet Metal ◽  
Process Parameters ◽  
New Method ◽  
Blank Holder Force ◽  
Technological Parameters ◽  
Blank Holder ◽  
Optimization Of Process Parameters

Taking example for U-shape sheet metal, the paper studies the forming and springback process with Dynaform, how much the springback influenced by several factors is studied, including die figure, stamping velocity, the stroke, the blank holder force and friction. Then a useful conclusion can be reached: Using die figure to optimize the technological parameters remarkably reduce the springback value, it provides a new method to control and solve the springback issue.

Influence of Pulse Electric Current on Solidification Structures of Al-Si Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 723-728 ◽  
Author(s):  
Chun Yan Ban ◽  
Yi Han ◽  
Qi Xian Ba ◽  
Jian Zhong Cui
Keyword(s):  
Electric Current ◽  
Magnetic Force ◽  
Current Treatment ◽  
Discharge Voltage ◽  
Experimental Results ◽  
Hypereutectic Alloy ◽  
Columnar Crystal ◽  
Pulse Electric Current ◽  
Primary Si ◽  
Pulse Electric

The effect of pulse electric current with different density on solidification structures of hypoeutectic Al-7%Si, Al-10%Si and hypereutectic Al-22%Si alloys was studied. The shape and distribution of α-Al and Si were analysed.The experimental results showed that α- Al of Al-7% Si alloy is shortened when applied a pulse electric current during the solidification, and the microstructure turns from the obvious columnar crystal into rosette. After treatment with pulse electric current, the primary Si of Al-22%Si alloy was refined obviously. When the discharge voltage was 3kV, Si tended to gather at the edge of the sample and the primary α- Al appeared in this hypereutectic alloy. When the discharge voltage was 6kV, the primary Si was refined much more and distributes uniformly. Pulse electric current treatment had no evident effect on the approximate eutectic Al-10%Si alloy. The magnetic force was analysed under pulse electric current, and the reason of the phenomenon was discussed

scholarly journals Springback Calibration of a U-Shaped Electromagnetic Impulse Forming Process

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 603 ◽  
Author(s):  
Xiaohui Cui ◽  
Zhiwu Zhang ◽  
Hailiang Yu ◽  
Xiaoting Xiao ◽  
Yongqi Cheng
Keyword(s):  
Tangential Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Simulation Method ◽  
Discharge Voltage ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
Sheet Bending ◽  
Sequential Coupling ◽  
Good Agreement

A three-dimensional (3D) finite-element model (FEM), including quasi-static stamping, sequential coupling for electromagnetic forming (EMF) and springback, was established to analyze the springback calibration by electromagnetic force. Results show that the tangential stress at the sheet bending region is reduced, and even the direction of tangential stress at the bending region is changed after EMF. The springback can be significantly reduced with a higher discharge voltage. The simulation results are in good agreement with the experiment results, and the simulation method has a high accuracy in predicting the springback of quasi-static stamping and electromagnetic forming.

scholarly journals Experimental and Numerical Analyses of Magnetic Pulse Forming of A1050 Aluminum Sheet

2020 ◽  
Vol 61 (2) ◽  
pp. 346-354
Author(s):  
Takashi Kambe ◽  
Yasutaka Kedo ◽  
Shinji Muraishi ◽  
Shinji Kumai
Keyword(s):  
Numerical Analyses ◽  
Aluminum Sheet ◽  
Magnetic Pulse ◽  
Magnetic Pulse Forming

Magnetic Pulse Forming of Thin-Aluminum Sheet Using Bar-Forming Coil

2011 ◽  
Vol 337 ◽  
pp. 621-624 ◽  
Author(s):  
Ji Yeon Shim ◽  
Ill Soo Kim ◽  
Dong Hwan Park ◽  
Bong Yong Kang
Keyword(s):  
Intelligent System ◽  
Analysis Data ◽  
Aluminum Sheet ◽  
Design Parameters ◽  
Fe Model ◽  
Magnetic Pulse ◽  
Forming Process ◽  
Thin Aluminum ◽  
Magnetic Pulse Forming ◽  
Measured Strain

Generally a MPF(Magnetic pulse forming) process refers to the high velocity and high strain rate deformation of a low-ductility materials driven by electromagnetic forces that are generated by the rapid discharge current through the forming coil. The goal of this study was to investigate the main design parameter in MPF. To achieve the above objectives, An intelligent system which consisted of thin 5053 aluminum sheet and bar forming coil was employed for the experiment. The measured strain data have been analyzed using the developed electromagnetic FE-model. The analysis data showed that the uniform electromagnetic force is one of most important design parameters in MPF process.

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