Experimental and Numerical Analyses of Tubular Electrohydraulic Forming Process

2021 ◽  
Vol 871 ◽  
pp. 80-86
Author(s):  
Ya Nan Wei ◽  
Fei Fei Zhang ◽  
Bo Wei ◽  
Hui Xu ◽  
Kai He
Keyword(s):  
High Speed ◽  
Discharge Voltage ◽  
Forming Process ◽  
Electrohydraulic Forming ◽  
High Speed Forming ◽  
Forming Efficiency ◽  
History Of ◽  
Instantaneous Discharge ◽  
And Performance ◽  
Forming Methods

Electrohydraulic forming (EHF) is a kind of high speed forming process, which deforms the metal by shock wave through instantaneous discharge of high voltage in water. Compared with the traditional forming methods, this high speed forming process can greatly improve the formability of the materials. There are many processing factors that affect the forming efficiency and performance of the electrohydraulic forming process, one of which is the discharge voltage between the electrodes. In this paper, three electrohydraulic forming experiments with various die shapes were carried out under various discharge voltage conditions. And the bulge height and axial length of the aluminum alloy A6061 tubes under different conditions were compared. Besides, finite element numerical simulation was also performed to quantitatively investigate the deformation history of the tube.

Study of Electromagnetic Forming Process on Tubular Components

2014 ◽  
Vol 592-594 ◽  
pp. 894-898
Author(s):  
K. Sriram ◽  
Karibeeran Shanmuga Sundaram ◽  
P. Arumugam
Keyword(s):  
High Speed ◽  
Electromagnetic Forming ◽  
Work Piece ◽  
Forming Process ◽  
Compression Process ◽  
Aluminium Copper ◽  
High Speed Forming ◽  
Set Up ◽  
Tubular Components ◽  
Forming Methods

Forming processes are defined as to modify the shape of a work piece by deforming it, without the removal of material. To overcome a number of longstanding problems in conventional forming methods such as low production rates, difficulty in forming light weight components etc., an alternate approach of electromagnetic forming process is introduced. Electromagnetic forming (EMF) is a high speed forming process used to form thinwalled work pieces (usually sheets and tubes) that have high electrical conductivity, such as aluminium, copper etc. Electromagnetic tube compression processes, the design of an experimental set up for electromagnetic tube compression process are discussed in detail in this paper

A Study and Analysis on Electromagnetic Compression Forming Processed Aluminum Alloy Tubes

2011 ◽  
Vol 337 ◽  
pp. 560-563
Author(s):  
Selvam Rajiv ◽  
Karibeeran Shanmuga Sundaram ◽  
Pablo Pasquale
Keyword(s):  
Aluminum Alloy ◽  
Mathematical Analysis ◽  
High Speed ◽  
High Rate ◽  
Outer Diameter ◽  
Forming Process ◽  
High Speed Forming ◽  
Forming Characteristics ◽  
Forming Methods ◽  
Electromagnetic Compression

Electromagnetic forming is one of the high- rate forming methods that are extensively used to form and join axisymmetric tubes and metal sheet. It is a high speed forming process using a pulsed magnetic field to form work pieces made of metals such as copper or aluminum alloys with high electrical conductivity. In this work, the experimental investigation and mathematical analysis of electromagnetic compression forming of aluminum alloy tubes AA6063 is studied. The aim of the work was to verify the results from MATLAB code with the experimental data. Experiments were conducted on aluminum alloy AA6063 tubes of outer diameter 40 mm and wall thickness of 2 mm with a nominal tensile strength of 214 MPa. The tube was compressed using 4 turn helical actuator discharge coil that can be energized up to 20 kJ. A study on the post forming characteristics hardness and on metallurgical effects were also carried out. The results of the mathematical analysis using MATLAB 2010 showed good correlation with experimental results.

scholarly journals Warm Electrohydraulic Forming: A Novel High Speed Forming Process

2017 ◽  
Vol 207 ◽  
pp. 323-328 ◽  
Author(s):  
Majid Zia ◽  
Ali Fazli ◽  
Mahdi Soltanpour
Keyword(s):  
High Speed ◽  
Forming Process ◽  
Electrohydraulic Forming ◽  
High Speed Forming

High Speed Locomotive Development: A European Experience

2010 ◽  
Author(s):  
Janis Vitins
Keyword(s):  
Power Unit ◽  
High Speed ◽  
Propulsion System ◽  
European Experience ◽  
History Of ◽  
And Performance

Europe has a long history of high speed locomotive and power unit development. This paper focuses on these developments in Sweden, Germany, Switzerland and Spain starting from high speed locomotives for 125 mph and ending with the AVE S112 high speed power unit for 206 mph. The major technical objectives starting in the 1970’s were to increase the speed and performance, while reducing the axle load from typically 21t at 125 mph to 17t at ≥ 156 mph. Developments of the propulsion system and vehicle concepts took place in many incremental steps, constantly improving the performance of high speed services. It is shown how American high speed locomotives relate to these developments and how one can learn from the European experience going forward.

Joining of Tubular Parts by Electromagnetic Forming; Experimental Investigations

2014 ◽  
Vol 792 ◽  
pp. 115-120 ◽  
Author(s):  
Pál Rácz ◽  
Nándor Göbl ◽  
Daniel Horváth ◽  
Athanasios G. Mamalis
Keyword(s):  
High Speed ◽  
New Technologies ◽  
Dissimilar Materials ◽  
High Energy ◽  
Mechanical Tests ◽  
Electromagnetic Forming ◽  
High Energy Density ◽  
Experimental Investigations ◽  
Forming Process ◽  
High Speed Forming

Electromagnetic forming is a high speed forming process, wherein the forming pressure is created by high energy density electromagnetic pulse. Besides direct shaping there are other application areas as well, so electromagnetic plastic forming is a potential field of creating joints between tube and rod-like components. Connecting components of dissimilar materials is an increasing demand in the manufacturing process of structures in the automotive industry. The application of new technologies, such as electrodynamic, especially electromagnetic forming, is a possible method to satisfy these demands. The article summarizes the most important fundamentals of electromagnetic forming; in particular, tube-rod joints, the main types of such joints; interference-fit and form-fit joints are described. Experiments, which were carried out producing tube-rod joints with electromagnetic forming, are also introduced. A new type of form-fit joints for tube-rod connections has been developed, which can withstand not only tensile loads but also torsion. Experiments and mechanical tests have proved the applicability of this kind of joints.

scholarly journals An All-Atom Simulation Study of Gas Detonation Forming Technique

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 611
Author(s):  
Ambarish Kulkarni ◽  
Vispi Karkaria ◽  
Milankumar Nandgaonkar ◽  
Sandeep P. Patil ◽  
Bernd Markert
Keyword(s):  
High Speed ◽  
Md Simulations ◽  
Dome Height ◽  
Forming Process ◽  
Gas Detonation ◽  
Failure Patterns ◽  
Deformation Response ◽  
Applied Loading ◽  
Wide Range ◽  
High Speed Forming

The high-speed forming process is the key to attaining difficult and irregular profiles on ductile materials. In the present work, we proposed the all-atom model of the gas detonation forming process, wherein molecular dynamics (MD) simulations were performed on the aluminum workpiece at different loading speeds similar to the various pressure values in the process. The deformation response of an aluminum workpiece for a wide range of loading speeds, 0.1–8 Å/ps, was investigated. The dome-height, failure patterns, and formability of the aluminum workpiece were examined for these loading speeds. We obtained an inverse relationship between the formability of the aluminum workpiece and the applied loading speed. Moreover, in this work, the influence of the different percentage of defects in the workpieces on the mechanical behavior was investigated. We observed that at lower speeds (< 2 Å/ps), the deformation is observed throughout the workpiece starting from the point of contact in the middle and that is contrary to the deformations observed due to the higher loading speed where localized deformations occur due to creation of slipping planes. We also found that the internal voids lead to the rearrangement of atoms to facilitate the movement of slipping planes leading to better formability compared to the no-void workpieces. This work helps to get a fundamental understanding of deformation behavior in the high-speed forming process with and without defects in the aluminum workpiece at the nanoscale.

Electromagnetic Sheet Bulging: Analysis of Process Parameters by FE Simulations

2013 ◽  
Vol 554-557 ◽  
pp. 741-748 ◽  
Author(s):  
Joao Pedro M. Correia ◽  
Saïd Ahzi
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
High Speed ◽  
Finite Element Simulations ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
High Speed Forming ◽  
Bulging Test ◽  
High Repeatability

Electromagnetic forming is a non-conventional forming process and is classified as a high-speed forming process. It provides certain advantages as compared to conventional forming processes: improved formability, high repeatability and productivity, reduction in tooling cost and reduction of springback and of wrinkling. However, various process parameters affect the performance of the electromagnetic forming system. Finite element simulations are very useful to optimize a process because they can reduce time and costs. With the aim of investigating the effects of the process parameters on the deformed blank geometry, finite element simulations of an electromagnetic sheet bulging test have been performed in this work. Furthermore the role of first impulse of discharged current is also investigated.

Electromagnetic Embossing of Optical Microstructures

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Lasse Langstädtler ◽  
Lars Schönemann ◽  
Christian Schenck ◽  
Bernd Kuhfuss
Keyword(s):  
Cross Section ◽  
High Speed ◽  
Machining Process ◽  
Average Surface Roughness ◽  
Forming Process ◽  
High Deformation Rate ◽  
Average Surface ◽  
High Deformation ◽  
Cube Corner ◽  
High Speed Forming

Electromagnetic forming (EMF) is a high-speed forming process that is already established in the macroworld. Due to its advantages like high deformation rate and cheaper tools, it is introduced to microforming. In this research, the replication of prismatic optical microstructures is investigated. EN AW-1050A (Al99.5) micrometal sheets with a thickness of 50 μm and 300 μm are electromagnetically micro-embossed. With this technique, it is possible to successfully replicate triangular cross section micro V-grooves of 86.6 μm in width and 24.1 μm in depth with an average surface roughness of Sa = 44 nm. The microstructures of the embossing tool are generated by diamond micro chiseling (DMC), a novel machining process to produce microstructures with discontinuous geometry, like miniature cube corner retro reflectors and V-grooves with well-defined endings.

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