Investigation into the hot forming-quenching integrated process with cold dies for high strength aluminum alloy

Jiang, Yanchao; Ding, Hua; Cai, Minghui; Chen, Y.; Liu, Y.; Zhang, Y.S.

doi:10.1016/j.matchar.2019.109967

Cited by 26 publications

(6 citation statements)

References 45 publications

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“…Most of the studies on high temperature forming on the 7075-T6 alloy, consists in forming the sheets by carrying out heat treatments under the tools as for hardening steels [4,5]. Only a limited number of studies have examined the multi-stage warm forming of sheets to assess the improvement in formability of these aluminum alloys [6,7].…”

Section: Introductionmentioning

confidence: 99%

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Royne

Laurent

Maillard

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The high mechanical properties of aluminum alloys are very interesting for reducing the weight of parts in the automotive sector. However, a formability issue prevents the use of these alloys at room temperature especially for complex shapes where part failure occurs before full drawing. The use of a warm forming process, which consists of heating the part between 150°C and 250°C for aluminium alloys, allows to increase formability and therefore to perform complex shapes. In this study, the forming of a cylindrical cup in 7075-T6 is carried out at 200° C in two steps by two successive reductions in the diameter of the blank. Numerical simulations of these two forming steps are performed with Abaqus. The influence of friction coefficient is analysed in these two forming steps by comparing the evolutions of punch force.

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Section: Introductionmentioning

confidence: 99%

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Royne

Laurent

Maillard

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The cold dies have been used to quench to realize rapid quenching and avoid thermal distortion [ 15 ]. The forming precision and mechanical properties were studied using two different HFQ process routes, and it was found that U-shaped specimens with high precision and uniform mechanical properties can be formed using HFQ [ 16 ]. Although HFQ has been widely used in the automotive and aerospace industries for complex-shaped curved components with superior precision and strength, wrinkling still occurs in the forming process of curved-surface shells with geometric asymmetry like the melon petals of the abovementioned tank.…”

Section: Introductionmentioning

confidence: 99%

Wrinkling and Strengthening Behaviors in the Two-Layer-Sheet Hot-Forming–Quenching Integrated Process for an Al–Cu–Mg-Alloy Thin-Walled Curved-Surface Shell

Fan

Sun

et al. 2023

Materials

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The thin-walled curved-surface component is an important structural element in aerospace. Wrinkling, springback and thermal distortion occur easily when forming these components. To form thin-walled components with high precision and strength, a two-layer-sheet hot-forming–quenching integrated process was proposed, in which wrinkling is prevented by thickening the upper sheet and springback is reduced by solution and die quenching. Selecting an appropriate upper sheet is crucial to suppress wrinkling and accomplish effective die quenching. The effect of the upper sheet on the wrinkling and strengthening behaviors of an Al–Cu–Mg-alloy melon-petal shell was thus studied in detail. The anti-wrinkle mechanism was analyzed through numerical simulation. The forming quality, including forming precision, deformation uniformity and strength, were further evaluated. The wrinkle gradually decreased with the increasing thickness of the upper sheet, resulting from the depressed compressive stress at the edge of the target sheet. A defect-free specimen with a smooth surface was finally formed when the thickness of the upper sheet reached three times that of the target sheet. The profile deviation was ±0.5 mm. Excellent thickness uniformity in a specimen can be obtained with a maximum thinning rate of 6%. The full strength, ranging from 455 to 466 MPa, can be obtained in all regions of the specimen, indicating that effective strengthening can be accomplished with the two-layer-sheet die quenching. The results indicated that high forming quality and full strength can be obtained in a two-layer-sheet hot-forming–quenching integrated process. This research has great potential for engineering applications using aluminum-alloy curved-surface thin-walled components.

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“…The hot forming and in-die quenching technique has been demonstrated and described previously [5][6][7][8][9][10][11][12], and shows adequate responses regarding mechanical properties, spring-back, and geometrical tolerances compared to cold forming. Forming directly after solution heat treatment provides the advantages of hot forming as well as utilizing heating in this process step.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Formability of AA6010 in an Integrated Forming and Hardening Process Aiming to Reduce the Energy Consumption in High Volume Production of Automotive Components

Myrold,

Jensrud,

Holmestad

2023

Metals

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Hot deformation and in-die quenching of aluminum components for the automotive industry is a cost and energy efficient technique that has been developed and thoroughly evaluated in recent years. The performance of this process is considered higher when compared to traditional cold metal forming due to shorter process times, low-cost machinery, and a high level of structural integrity in fabricated parts. The work presented in this paper provides several approaches for the formability of age hardenable 6xxx alloy sheets when forming at different temperatures. Warm tensile testing and formability cup testing were carried out to investigate the alloy formability at different temperatures. The results indicate that the formability of candidate alloys is not significantly affected by deformation temperatures or conditions, which provides great freedom when designing an automated production process with high productivity and minimal environmental impact. The candidate alloy can be deep drawn without severe thinning at the whole temperature range, from room temperature (RT) to solutionizing temperature.

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Investigation into the hot forming-quenching integrated process with cold dies for high strength aluminum alloy

Cited by 26 publications

References 45 publications

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Wrinkling and Strengthening Behaviors in the Two-Layer-Sheet Hot-Forming–Quenching Integrated Process for an Al–Cu–Mg-Alloy Thin-Walled Curved-Surface Shell

Investigation of the Formability of AA6010 in an Integrated Forming and Hardening Process Aiming to Reduce the Energy Consumption in High Volume Production of Automotive Components

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