The punch speed influence on warm forming and springback of two Al-Mg-Si alloys

Simões, Vasco M.; Oliveira, M. C.; Laurent, Hervé; Menezes, L.F.

doi:10.1016/j.jmapro.2019.01.020

Cited by 14 publications

(5 citation statements)

References 37 publications

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“…The functional relationship between the friction coefficient and interface load is as follows. µ = 0.138(F/15) −0.207 + 0.01 (9) Five groups of normal loads of 15, 25, 45, 55 and 65 N were selected in order to verify the validity of the model. The values of the five groups of normal loads were substituted into Equation (9).…”

Section: Effect Of Normal Load On the Friction Behavior Of Materialsmentioning

confidence: 99%

“…µ = 0.138(F/15) −0.207 + 0.01 (9) Five groups of normal loads of 15, 25, 45, 55 and 65 N were selected in order to verify the validity of the model. The values of the five groups of normal loads were substituted into Equation (9). The actual measurement and function prediction calculation results are shown in Table 4.…”

Section: Effect Of Normal Load On the Friction Behavior Of Materialsmentioning

confidence: 99%

“…V.M. Simões [9] reported that the punch speed had a significant influence on the success of the sheet metal warm forming of aluminum alloys, and formability and spring-back remained stable or improved with the increase in punch speed.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Sheet Metal Forming (Warm Stamping Process): A Study of the Variable Friction Coefficient on 6111 Aluminum Alloy

Dou

Wang

Xia

et al. 2020

Metals

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Aluminum alloy materials have been widely used in automobile, aerospace and other fields because of their low density, high specific strength and corrosion resistance. The process of the warm forming of aluminum alloy improves the formability of aluminum alloy sheets, reduces the deformation resistance and spring-back and improves the forming accuracy and quality of parts. For these reasons, it is frequently used. In this work, the effects of temperature, sliding speed and normal load on the friction coefficient of 6111 aluminum alloy were studied by using a CFT-I (Equipment Type) friction tester under boundary lubrication conditions. The surface morphology of the sample after the friction test was observed by optical microscopy. The results show that the surface quality of aluminum alloy is better at 200 °C, which was used as the temperature in the experiments. According to the test measurement results, the friction coefficient increases with the increase in temperature and decreases with the increase in sliding speed and normal load. Variable friction coefficient models of sliding speed and normal load were established. Using the optimal parameter combination as the simulation parameter, the established variable friction coefficient models were input into numerical simulation software, and two sets of comparative simulations were established. The thickness distribution of the sheet material obtained through the simulation was compared with the actual test measurement. Further verification was carried out through the amount of spring-back. The results show that the thickness distribution and spring-back of the sheet obtained by the variable friction coefficient model are closer to the actual measurements (the error of the spring-back angle decreased from more than 20% to less than 10%), which verifies the reliability and accuracy of the variable friction coefficient model.

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Section: Effect Of Normal Load On the Friction Behavior Of Materialsmentioning

confidence: 99%

Section: Effect Of Normal Load On the Friction Behavior Of Materialsmentioning

confidence: 99%

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Analysis of Sheet Metal Forming (Warm Stamping Process): A Study of the Variable Friction Coefficient on 6111 Aluminum Alloy

Dou

Wang

Xia

et al. 2020

Metals

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“…This allows for the formation of complex shapes compared with low-speed forming methods. Moreover, it provides the advantage of reducing spring back due to inertial effects [1][2][3]. High-speed forming techniques include explosive forming, EMF (Electromagnetic Forming), and EHF (Electrohydraulic Forming).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Kim,

Kim

2024

Materials

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This paper provides a comparison between the conventional Electromagnetic Forming (EMF) technique and the novel Electromagnetic Hydraulic Forming (EMHF) approach. The EMHF involves the use of finite element analysis coupled with the EM and arbitrary Lagrangian–Eulerian techniques analyzed through LS-DYNA. In the free-bulge configuration, EMF is influenced by the forming coil, resulting in a dead zone and uneven forming. Additionally, EMF can only be used to shape materials with high electrical conductivity. In contrast, EMHF, driven by induced hydraulic pressure from the electromagnetic field-affected drive sheet, is independent of the electrical conductivity of the material and produces dome-shaped workpieces. For rectangular die shapes, EMF is prone to collision owing to the acceleration of the blank, which results in a reduced quality owing to bouncing. However, EMHF exhibits no bouncing effect and successfully achieves the target shape in most cases. The two techniques differ in the strain rate, with EMF at 4850/s, whereas EMHF operates at approximately 1250/s. Despite being slower, EMHF is still a high-speed forming technique. In conclusion, EMHF is a promising technique capable of addressing the shortcomings of conventional EMF and achieving improvements in forming processes.

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“…The springing is additionally affected by the strain rate. Increased velocity of the punch results in beneficial forming conditions due to the lower dynamic recovery, which affects the stability of deformation and springing [14]. The heat transfer between the workpiece and the forming tools is another important aspect.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Jaśkiewicz¹,

Skwarski²,

Polak³

et al. 2020

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The paper covers the research on the process of solutionizing of 7075 aluminum alloy in cold tools during the stamping of a high-strength structural element (B-pillar's base). For technological reasons, in order to obtain high strength parameters of the 7075 alloy, it is necessary to carry out a solutionization process, which allows to obtain dispersion strengthening during ageing process. Properly performed heat treatment of the alloy increases the strength of the material to approx. 600 MPa. The combination of the process of solutionization with simultaneous shaping is aimed at improving and simplifying technological operations of aluminum alloy stamping, shortening the duration of the manufacturing process and reducing production costs. The manufactured lower part of the B-pillar will be used for the verification of the validity of the developed method. During the experiment, a series of stamping tests were carried out, in which the lubricants, pressure and position of the upper and lower blankholders were the variables. The obtained results allow to estimate the influence of the cooling conditions on the strength of the drawpieces obtained after the process of artificial ageing. In order to verify and analyse the results more quickly, a numerical simulation was carried out.

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The punch speed influence on warm forming and springback of two Al-Mg-Si alloys

Cited by 14 publications

References 37 publications

Analysis of Sheet Metal Forming (Warm Stamping Process): A Study of the Variable Friction Coefficient on 6111 Aluminum Alloy

Analysis of Sheet Metal Forming (Warm Stamping Process): A Study of the Variable Friction Coefficient on 6111 Aluminum Alloy

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Archives of Metallurgy and Materials

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