Numerical investigations on springback characteristics of aluminum sheet metal alloys in warm forming conditions

Kim, Hong Seok; Koç, Muammer

doi:10.1016/j.jmatprotec.2007.11.059

Cited by 85 publications

(47 citation statements)

References 24 publications

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“…This resulted in tensile stresses in the lower layer and compressive stresses in the upper layer. This stress distribution created a large bending moment, and therefore a large amount of springback in this region; this was observed in common with the findings reported in [17]. At 450°C, the tangential stress gradients between the top and bottom layers of the blank decreased, except at the entry and exit to this region where there was higher plastic stretching at the punch and die corners.…”

Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionssupporting

confidence: 89%

“…This was due to the reverse bending effect (a similar effect was also found in [17]), which becomes more significant at elevated temperatures when the material strength is lower. The lower through-thickness tangential stress gradients that result Figure 6 The multi-stage FE simulation schemes for the a U-shape and b L-shape bending processes leads to further reduced side wall curvature and hence springback.…”

Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionssupporting

confidence: 63%

“…It has been shown previously that the difference between the tangential stress distributions across the top and bottom layers of a formed blank influences the level of springback [17]. The larger the tangential stress gradient through the thickness of the blank, the greater the springback.…”

Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionsmentioning

confidence: 93%

“…The experiments and finite element (FE) simulation work conducted by Moon et al [16] and Kim et al [17] showed that springback increased with increasing punch/forming speed, therefore a slow forming rate was recommended to reduce springback for warm forming. The clearance/gap between the punch and die also directly affected the drawing force, which is crucial to springback reduction.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Springback analysis of AA5754 after hot stamping: experiments and FE modelling

Wang

Zhong

Fakir

et al. 2016

Int J Adv Manuf Technol

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In this paper, the springback of the aluminium alloy AA5754 under hot stamping conditions was characterised under stretch and pure bending conditions. It was found that elevated temperature stamping was beneficial for springback reduction, particularly when using hot dies. Using cold dies, the flange springback angle decreased by 9.7 % when the blank temperature was increased from 20 to 450°C, compared to the 44.1 % springback reduction when hot dies were used. Various other forming conditions were also tested, the results of which were used to verify finite element (FE) simulations of the processes in order to consolidate the knowledge of springback. By analysing the tangential stress distributions along the formed part in the FE models, it was found that the springback angle is a linear function of the average through-thickness stress gradient, regardless of the forming conditions used.

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Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionssupporting

confidence: 89%

Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionssupporting

confidence: 63%

Section: Springback Of U-shaped Test-piece Under Hot Stamping Conditionsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Springback analysis of AA5754 after hot stamping: experiments and FE modelling

Wang

Zhong

Fakir

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Accurately measuring the spring-back amounts in three distinct tooling regions (i.e., die corner, punch corner and side wall) were explained in detail under a wide range of operating conditions. Additionally, the effects of spring-back over blank holder force (BHF), friction condition and forming rate were also analysed [24]. Researchers also examined parameters like punch, die radius, punch radius and punch holder by using genetic algorithms to reach the most suitable die design [25].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Deformation of X10CrAlSi24 Sheet Material Applied V-Bending Process

Özdemir

Gökmeşe

2018

Teh. vjesn.

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This study used X10CrAlSi24 (1.4762) sheet material, which is widespread in bending processes of the energy sector. During bending of X10CrAlSi24 (1.4762) sheet materials, cracking and tearing occur due to these materials' brittleness at room temperatures. To avoid this phenomenon, bending was carried out by applying normalization treatments at 800 ºC, 850 ºC, 900 ºC and 950 ºC. V-bending processes were performed at three different bending angles (30º, 60º, 90º) and by a 4.5 mm punch tip radius. V-bending processes were carried out without leaving the punch on the material, and crushing of the punch on the sheet material sectional area was allowed. As a result of the bending processes, spring-go occurred in the 30º and 60º bending applications, whereas spring-back occurred in the 90º bending applications. The formation mechanism of capillary cracks (depending on deformation) due to internal stress especially at low temperatures was introduced by the microstructural characterization of the specimens.

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Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

et al. 2023

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In the past decade, aluminum alloys have become important structural materials in the automotive industry, thanks to their low density, high strength, high fracture toughness, and good fatigue performance. However, an important limitation of aluminum alloys is their poor formability at room temperature; as a result, numerous studies have been conducted with the aim of developing forming techniques to overcome this and facilitate the forming of more complex‐shaped components. Following an overview on the metallurgical background of aluminum alloys, this article reviews recent developments in forming processes for aluminum alloys. The focus is on process variants at room temperature and at higher temperatures and on a new hot forming technique promising considerable improvements in formability. This review summarizes the influence of different process parameters on microstructures and mechanical properties. Particular emphasis is given to process design and to the underlying microstructural phenomena governing the strengthening mechanisms.

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Numerical investigations on springback characteristics of aluminum sheet metal alloys in warm forming conditions

Cited by 85 publications

References 24 publications

Springback analysis of AA5754 after hot stamping: experiments and FE modelling

Springback analysis of AA5754 after hot stamping: experiments and FE modelling

Microstructural Characterization and Deformation of X10CrAlSi24 Sheet Material Applied V-Bending Process

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

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