scholarly journals Advances and challenges on springback control for creep age forming of aluminum alloy

2021 ◽  
Author(s):  
Liwen Zhang ◽  
Heng Li ◽  
Tianjun Bian ◽  
Changhui Wu ◽  
Yang Gao ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Springback Control ◽  
Creep Age Forming

Study the Influence of Geometric Parameters on Springback in T-Section Aluminum Alloy Window Trim Strip Sheets Forming

2018 ◽  
Vol 920 ◽  
pp. 70-76 ◽  
Author(s):  
Bao Hang Zhu ◽  
Yi Xi Zhao ◽  
Zhong Qi Yu ◽  
Hui Yan
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Geometric Parameters ◽  
Finite Element Models ◽  
Quality Requirement ◽  
Forming Process ◽  
Assembly Quality ◽  
Simulation Results ◽  
In The Beginning ◽  
Springback Control

The T-section aluminum alloy window trim strip sheets are used to improve vehicle appearance. As the mobile scenery line, these window trim strips with claws need high forming accuracy to meet good assembly quality requirement. The top portion of the T-section sheet is stamped to form an edge flange structure. Springback control is essential in forming process. In this paper, the influence of the window trim strip geometric parameters on forming springback is studied. Some finite element models of the process were built with the Dynaform software. The simulation results were verified experimentally. The main conclusions include as belows: The different heights of the stiffeners part in T-section change the stiffness of the part. Although the stiffeners part does not participate in the forming, it also has springback in the forming process. So, it is necessary to study the influence of the flanging part width (W) and the stiffeners part height (H) of the T-section on springback. We set W to 15 mm and change the value of H value according to the real product. The value of springback increases with the increase of H value in the beginning. After ratio of H/W increases to 0.6, the value of springback fluctuates with the increase of H value. When ratio of H/W is about 0.5, the springback values are mostly less than ± 0.5 mm in key sections, which is acceptable.

scholarly journals Evaluation of a 7050-TAF aluminum alloy submitted to creep age forming

2014 ◽  
Vol 17 (3) ◽  
pp. 603-611 ◽  
Author(s):  
Paulo Roberto Costa Junior ◽  
Carlos de Moura Neto ◽  
Darrell A. Wade
Keyword(s):  
Aluminum Alloy ◽  
Creep Age Forming

scholarly journals A Research on the Creep Age Forming of 2524 Aluminum Alloy: Springback, Mechanical Properties, and Microstructures

2014 ◽  
Vol 6 ◽  
pp. 707628 ◽  
Author(s):  
Lihua Zhan ◽  
Sige Tan ◽  
Youliang Yang ◽  
Minghui Huang ◽  
Wenqi Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Prediction Models ◽  
Stress Gradient ◽  
Sheet Thickness ◽  
Linear Regression Method ◽  
Forming Process ◽  
Bending Radius ◽  
Springback Prediction ◽  
Creep Age Forming

A series of orthogonal tests have been designed to investigate the combined effects of aging temperature, time, predeformation, and part thickness features on the springback of creep age forming of 2524 aluminum alloy sheets. Two springback prediction models containing the four process parameters mentioned above are developed based on experimental results and the multiple linear regression method. The comparisons of predicted and experimental values of springback yield good agreement. The dependence of springback on stress gradient across the thickness of sheet is examined in detail, showing that springback increases with the decrease in stress gradient while maintaining the ratio of bending radius to sheet thickness ( R0/ H) as constant. In addition to springback, the mechanical properties and microstructural evolution are also researched. In the creep age forming process, the compression side of the sheet has higher mechanical properties and is characterized by more and finer precipitates in grains as compared to tension side.

Creep age forming of 2124 aluminum alloy with single/double curvature

2013 ◽  
Vol 23 (7) ◽  
pp. 1922-1929 ◽  
Author(s):  
Jin ZHANG ◽  
Yun-lai DENG ◽  
Si-yu LI ◽  
Ze-yu CHEN ◽  
Xin-ming ZHANG
Keyword(s):  
Aluminum Alloy ◽  
Double Curvature ◽  
Creep Age Forming

Effect of Process Parameters on Microstructures of 7055 Aluminum Alloy in Creep Age Forming

2011 ◽  
Vol 80-81 ◽  
pp. 40-45 ◽  
Author(s):  
Li Hua Zhan ◽  
Yan Guang Li ◽  
Ming Hui Huang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Process Parameters ◽  
Ageing Time ◽  
Aged Alloy ◽  
Transmission Electron ◽  
7055 Aluminum Alloy ◽  
Creep Age Forming

The effects of process parameters on evolution of microstructures of 7055 aluminum alloy in creep age forming were studied and the microstrucures were analyzed using transmission electron microscopy (TEM). Some important results are obtained: with the increasing of ageing time, the size of platelet shaped (known as Guinier-Preston (G-P) zones) precipitates and spherical shaped η' precipitates increased, the number of platelet shaped precipitates increased too, while the number of η' precipitates decreased; the precipitates with almost the same size distributed continuously and uniformly along the grain boundary with quite narrow precipitate free zones (PFZs) at 5 hours of ageing time, when the ageing time increases to 8 hours, the distribution of the precipitates along the grain boundary becomes discontinuous and the PFZs gets wider, while with the further increasing of the ageing time, the precipitates distributed continuously again along the grain boundary and the PFZs become more wider. From comparison of stress-aged alloy to stress-free-aged alloy, it was found that after 20 hours ageing, the precipitates in the stress-aged alloy are slightly coarser and the PFZs are wider, the density of retained η' is lower with the development of η phase.

Effect of pre-deformation on creep age forming of 2219 aluminum alloy: Experimental and constitutive modelling

2017 ◽  
Vol 683 ◽  
pp. 227-235 ◽  
Author(s):  
Youliang Yang ◽  
Lihua Zhan ◽  
Rulin Shen ◽  
Xuni Yin ◽  
Xicai Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Modelling ◽  
2219 Aluminum Alloy ◽  
Creep Age Forming

Creep Age Formability of Friction Stir Welded 2A12 Aluminum Alloy Structures

2013 ◽  
Vol 753-755 ◽  
pp. 145-148
Author(s):  
Da Hai Liu ◽  
Jun Chu Li ◽  
Chun Chang
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Aging Time ◽  
Aging Temperature ◽  
Welded Structures ◽  
Friction Stir ◽  
Forming Characteristics ◽  
Welding Joints ◽  
Creep Age Forming

To establish the efficacy of creep age forming of the integrally friction stir welded panels, feasibility experiments were first conducted on friction stir welded rib-web panels of 2A12 aluminum alloys by using a designed air-loading age forming setup, and then related forming characteristics were investigated by using a mechanical-loading setup on the samples with and without friction stir welding joints. Results show that good age-formability can be observed from friction stir welded rib-web parts after creep age forming. The surface springback of the integral parts decreases with increasing the aging time and temperature. For 2A12 aluminum alloy, under an aging temperature of 190°C, a relatively better forming effect and strength can be reached at an aging time of about 8h. Compared with the non-welded structures, the introduction of friction stir welding will inhibit forming rate and will shorten the time of creep age forming.

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