Calculation of electromagnetic force in electromagnetic forming process of metal sheet

The effect of the motional electromagnetic force in the electromagnetic forming circuit on the workpiece velocity is analyzed. The differential equations of unconsidering and considering the motional electromagnetic force in the electromagnetic forming circuit are solved numerically. The results without considering the motional electromagnetic force are unavailable because they violate the law of conservation of energy, while the results with considering the motional electromagnetic force can accurately reflect the electromagnetic forming process. Furthermore, it is found that the electrical energy transforms into the kinetic energy due to the motional electromagnetic force.

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Coil-less electromagnetic forming process with uniform-pressure characteristics for shaping sheet metals

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2021.07.065 ◽

2021 ◽

Vol 70 ◽

pp. 140-151

Author(s):

Quanliang Cao ◽

Xian Li ◽

Zhenhao Li ◽

Limeng Du ◽

Liangyu Xia ◽

...

Keyword(s):

Electromagnetic Forming ◽

Uniform Pressure ◽

Sheet Metals ◽

Forming Process ◽

Pressure Characteristics

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Affected Characteristics Analysis of the Pulsed Laser Forming of Metal Sheet

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.375-376.333 ◽

2008 ◽

Vol 375-376 ◽

pp. 333-337

Author(s):

Li Jun Yang ◽

Yang Wang

Keyword(s):

Laser Beam ◽

Pulsed Laser ◽

Metal Sheet ◽

Grain Structure ◽

Experimental Result ◽

Laser Forming ◽

Forming Process ◽

Grain Orientations ◽

Characteristics Analysis ◽

Relationship Of

Laser forming of metal sheet is a forming technology of sheet without a die that the sheet is deformed by internal thermal stress induced by partially irradiation of a laser beam. In this paper, the bending behavior of common stainless steel 1Cr18Ni9 sheet is studied after being irradiated by straight line with a Nd:YAG pulsed laser beam. The aim of the investigation is to find out the relationship of the physical behaviors of heat affected zone (HAZ) with the pulse parameters of the laser. Through the analysis of the fundamental theory of pulsed laser affected, this paper shows the affected characteristics of metal sheet with pulsed laser forming. The results show that the microstructure of HAZ of pulsed laser scanned is layered, and the micro-hardness is improved than that in matrix. The microstructures show that the deformed grain structure is inhomogeneous, that caused the grain sizes and grain orientations in HAZ to become different. By qualitative analysis of experimental result, the conclusion obtained may provide basis for theoretical investigation and possible industrial application of laser forming process in the future.

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Determination of Flow Curves at High Strain Rates using the Electromagnetic Forming Process and an Iterative Finite Element Simulation Scheme

CIRP Annals ◽

10.1016/s0007-8506(07)60413-2 ◽

2006 ◽

Vol 55 (1) ◽

pp. 267-270 ◽

Cited By ~ 16

Author(s):

M. Kleiner ◽

A. Brosius

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

High Strain ◽

Electromagnetic Forming ◽

Strain Rates ◽

Forming Process ◽

Flow Curves ◽

Element Simulation ◽

Simulation Scheme

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Analysis of electromagnetic force and experiments in electromagnetic forming with local loading

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-170038 ◽

2018 ◽

Vol 57 (1) ◽

pp. 29-37 ◽

Cited By ~ 13

Author(s):

Li Qiu ◽

Yijie Yu ◽

Yuqi Yang ◽

Xiaopeng Nie ◽

Yao Xiao ◽

...

Keyword(s):

Electromagnetic Force ◽

Electromagnetic Forming ◽

Local Loading

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Quadrilateral Shape Rib Forming by Roll Forming Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.878.296 ◽

2018 ◽

Vol 878 ◽

pp. 296-301

Author(s):

Dong Won Jung

Keyword(s):

Automotive Industry ◽

High Strength Steel ◽

Numerical Study ◽

Thickness Distribution ◽

High Strength ◽

Metal Sheet ◽

Product Performance ◽

Roll Forming ◽

Forming Process ◽

Roll Forming Process

The roll forming is one of the simplest manufacturing processes for meeting the continued needs of various industries. The roll forming is increasingly used in the automotive industry to form High Strength Steel (HSS) and Advanced High Strength Steel (AHSS) for making structural components. In order to reduce the thinning of the sheet product, traditionally the roll forming has been suggested instead of the stamping process. The increased product performance, higher quality, and the lowest cost with other advantages have made roll forming processes suitable to form any shapes in the sheets. In this numerical study, a Finite Element Method is applied to estimate the stress, strain and the thickness distribution in the metal sheet with quadrilateral shape, ribs formed by the 11 steps roll forming processes using a validated model. The metal sheet of size 1,000 × 662 × 1.6 mm taken from SGHS steel was used to form the quadrilateral shape ribs on it by the roll forming process. The simulation results of the 11 step roll forming show that the stress distribution was almost uniform and the strain distribution was concentrated on the ribs. The maximum thinning strain was observed in the order of 15.5 % in the middle rib region possibly due to the least degree of freedom of the material.

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Theoretical Investigation of the Bending Process of the Pre-Strained Metal Sheet

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.299.351 ◽

2020 ◽

Vol 299 ◽

pp. 351-357

Author(s):

Sergey A. Tipalin ◽

Michael A. Petrov ◽

Yuriy A. Morgunov

Keyword(s):

Thin Sheet ◽

Bending Moment ◽

Metal Sheet ◽

Roll Forming ◽

Forming Process ◽

Bending Process ◽

Punch Radius ◽

Zero Radius ◽

Strain Stress ◽

Roll Forming Process

During the bending operation of the thin sheet materials by the punch with the near-to-zero radius the special technological operation should be carried out. It means that the metal sheet obtained a certain thinning value, which is usually done in the form of the channel-concentrator or groove by pre-drawing operation in a cold state. It follows to the pre-straining and strengthening of the material. The authors investigated the strain hardened sheet's area after roll forming process theoretically, and obtained the strain-stress distribution inside the sheet during the bending operation. It was found out that the increase of the prior deformation during pre-straining in the bend layer follows to the increase of the radial and tangential stresses and displacement of the neutral axis inside the blank during bending operation. As a result, the bending moment changes its values depends on the punch radius and strain hardening.

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