Electromagnetic impulse calibration in V-shaped parts

Cui, Xiaohui; Yu, Hailiang; Wang, Qingshan

doi:10.1007/s00170-018-2108-5

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…Golovashchenko et al [10] used EMF to eliminate the bending springback of 6111-T4 aluminum alloy strips; in this work, the reduction of springback was attributed to the reduction of residual stresses. Cui et al [11] studied the springback of 5052 aluminum alloy V-shaped parts created via EMF. It was found that the stress in the inner and outer layers of the rounded was subject to a repeated alternating pattern of stretching and compression in the EMF process.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment and electromagnetic forming on springback and properties of 7075 aluminum alloy sheet

Du,

Han,

Han

et al. 2024

Preprint

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7075 aluminum alloy is widely used in aerospace-related applications due to its high specific strength and good corrosion resistance; however, it is difficult to deform 7075 aluminum alloy at room temperature. In this paper, we investigate the mechanical and corrosion properties and springback characteristics of 7075 aluminum alloy after electromagnetic forming and heat treatment. The 7075 aluminum alloy subject to different pre-natural aging conditions was deformed via electromagnetically assisted stamping; the part was then subject to a second natural aging process. After a total natural aging time of 3 h, the parts were artificially aging at 120°C. It was found that the peak time of artificial aging (18 h) was not affected by the various pre-natural aging procedures and electromagnetic forming. The intergranular corrosion depths were found to be 92.6 and 5.4 µm for parts subject to peak artificial aging and retrogression and re-aging (RRA). This is because the grain boundary contains regions of continuous η phase and the cubic texture of the material is weak under peak aging. However, grain boundaries were found to exhibit discontinuous η phases, and the cubic texture of the material was enhanced after the RRA processing.

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Section: Introductionmentioning

confidence: 99%

Effect of heat treatment and electromagnetic forming on springback and properties of 7075 aluminum alloy sheet

Du,

Han,

Han

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…This allowed it to greatly improve the material forming limit, simplify the mold manufacturing, reduce residual stress, enhance forming accuracy, and easily control the energy, improving the production automation. For example, Cui et al [9][10] simulated the electromagnetically-assisted forming of V-shaped and U-shaped parts. Cui et al [11] proposed a novel reverse-bending method using EMF.…”

Section: Introductionmentioning

confidence: 99%

Large ellipsoid parts manufacture using electromagnetic incremental forming with variable blankholder structure

Cui

Yan

Chen

et al. 2021

Int J Adv Manuf Technol

Self Cite

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The large ellipsoid parts are the main load-bearing components in the rocket tank, which are prone to wrinkle when using the traditional stamping. In order to solve the wrinkling problem in large parts, the EMIF method with a variable blank holder is proposed in this paper. The numerical simulation has shown that the sheet material near the blank holder is, as a consequence of stamping, subjected to circumferential compressive stress. When the drawing height was 100 mm, the sheet metal was notably wrinkled. In the electromagnetic forming (EMF) process, the sheet region facing the coil becomes thinner.However, the sheet metal thickness corresponding to the coil edge increases with the increase in forming height. If the EMF forming height is 150 mm, the sheet, which is in contact with the smooth mold, is deformed without a wrinkle. Compared to the traditional stamping, the EMF can signi cantly reduce the sheet metal wrinkling, improving the deformation height of the sheet metal smooth area.

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“…By contour restraining a straight U-channel and applying electromagnetic current, Golovashchenk obtained stress relief of the part and, thus, decreased springback action. Electromagnetic impulse calibration applied to deep drawn U-channels was demonstrated effectively to minimize springback and correcting sidewall curl defects by Iriondo et al [14] and was later verified numerically by Cui et al [15]. Another, relatively new, calibration method is pulsed electrohydraulic springback calibration developed by Golovashchenko et al [16].…”

Section: Introductionmentioning

confidence: 99%

A new mechanical calibration strategy for U-channel extrusions

Raknes

Welo

et al. 2020

Int J Adv Manuf Technol

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The extrusion process of aluminum profiles introduces dimensional variations commonly exceeding the dimensional tolerance requirements for fit-up and assembly when using automated welding processes in the automotive industry. Improving dimensional accuracy of extrusions is challenging from both a technical and economical point of view. However, an alternative technical approach is to introduce fast and simple downstream processes, such as mechanical calibration, to achieve components or products with improved dimensional characteristics. In this paper, a new mechanical calibration strategy is proposed based on the principle of combining transversal stretching and local bending. The strategy is tested on a U-channel extrusion-which is a particularly challenging geometry for extrusions concerning dimensional accuracy. The overall objective is to improve gap opening variations on U-channels compared with as-extruded dimensional capabilities, especially in the case of alloys that are water quenched to obtain high strength and ductility. The study is also intended to serve as basis for future optimization of the mechanical calibration process. An experimental platform and die/tool system was developed, and finite element simulation was used as a research tool to reproduce and better understand the calibration process, thus further analyzing the mechanisms and deformation characteristics important to dimensional accuracy. The experimental results show that the mechanical calibration strategy has good potential to improve the dimensional accuracy of gap openings of U-channels by 90%. The study demonstrates that as-extruded profiles with tolerance limits exceeding the requirements of the final component can effectively be calibrated with the proposed method and hence used in high-volume manufacturing.

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Electromagnetic impulse calibration in V-shaped parts

Cited by 19 publications

References 11 publications

Effect of heat treatment and electromagnetic forming on springback and properties of 7075 aluminum alloy sheet

Effect of heat treatment and electromagnetic forming on springback and properties of 7075 aluminum alloy sheet

Large ellipsoid parts manufacture using electromagnetic incremental forming with variable blankholder structure

A new mechanical calibration strategy for U-channel extrusions

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