Investigation and prediction of springback in rotary-draw tube bending process using finite element method

Sözen, Levent; Güler, Mehmet Ali; Bekar, Deniz; Acar, Erdem

doi:10.1177/0954406212440672

Cited by 12 publications

(4 citation statements)

References 23 publications

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“…[3][4][5] To solve the springback defects in MPF and other forming process, many scholars worldwide have conducted research on the springback prediction and compensation. 6,7 In theory, N'jock et al 8 proposed an advanced model formulated in the framework of non-associative plasticity to accurately predict the springback of advanced high strength steels material. Liu et al 9,10 calculated the residual stress distribution in thick plate, and proposed an effective method to evaluate the springback in MPF.…”

Section: Introductionmentioning

confidence: 99%

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Multi-point forming (MPF) is widely used for three-dimensional (3D) curved surfaces, and the multi-point die (MPD) is reconstructed with the desired curvature and the compensated curvature which is caused by springback. Springback is affected by mechanical anisotropy of material in MPF. To predict the springback of anisotropy sheet in MPF process, the finite element models were established based on the three different yield criteria namely; von Mises, Hill's 48 and Yld2004-18p. To compensate the springback of anisotropy sheet, an algorithm with consideration of anisotropy for doubly curved sheet was proposed based on the results of the finite element simulation and the elastic perfect plastic biaxial bending model. The direct curvature adjustment (DCA) method and the Non-Uniform Rational B-Splines (NURBS) method are used to generate the die surface after springback compensation. The final shape of the workpiece is obtained by the execution of iterative compensation. The forming experiments were carried out and the results show that the anisotropic model is closer to the experiment than the isotropic model. Finally, the influences of blank thickness, part shape and forming radius on compensation accuracy were discussed to verify the applicability of the algorithm.

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Section: Introductionmentioning

confidence: 99%

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…3,5,6 However, studies for 3D variable curvature bent tube have not been well developed, which are new challenges for the precision-forming technology.…”

Section: Introductionmentioning

confidence: 99%

“…Current research in springback of tube bending mainly focuses on the plane constant curvature axis tube with hot or cold bending, combined with advanced computer numerical control (CNC) tube-bending technology. 3,5,6 However, studies for 3D variable curvature bent tube have not been well developed, which are new challenges for the precision-forming technology.…”

Section: Introductionmentioning

confidence: 99%

Springback prediction of three-dimensional variable curvature tube bending

Zhang

2016

Advances in Mechanical Engineering

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The springback phenomenon of tube bending occurs consequentially after unloading, which will affect the manufacturing accuracy and processing efficiency of the tubular products. In this article, the bending and springback processes of minor-diameter thick-walled tube are simulated by ABAQUS to reveal the springback laws. The springback prediction of three-dimensional variable curvature bent tube is projected on each discrete osculating and rectifying plane, and then the three-dimensional problem can be transformed into two dimensions. The mathematic relationship of the radius before and after springback in the plane is built by approximate pure bending springback experiments. The springback on such planes is transformed into three dimensions. The tube axes are merged by first-order geometric (G1) continuity and then compensated with the modified function according to the axis complexity, so as to establish mathematic analytic model for springback prediction of three-dimensional variable curvature tube bending. Finally, the feasibility, reliability, and accuracy of the model are verified by finite element method and experiments.

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“…Li et al 10 revealed the nonlinear springback characterization and behaviors of high strength Ti-3Al-2.5V tube by finite element (FE) analysis. Also by the FE analysis, the geometry-dependent springback behaviors of thin-walled Al-alloy 6061-T4 tube on rotary draw bending were revealed by Li et al 11 Sözen et al 12 addressed the springback phenomena of steel tube NC bending under the interactions between the geometrical and mechanical parameters and developed a surrogate model to predict fast the springback for a given combination of parameters. Using the numerical simulation, Zhan et al 13 investigated the springback mechanism for larger-diameter thin-walled CT20 Ti-alloy tube and proposed a two-level springback compensation method.…”

Section: Introductionmentioning

confidence: 99%

Springback law of high-strength 21-6-9 stainless steel tube in numerical control bending under different process parameters

Fang

Wang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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In order to achieve the precision bending deformation, the effects of process parameters on springback behaviors should be clarified preliminarily. Taking the 21-6-9 high-strength stainless steel tube of 15.88 mm × 0.84 mm (outer diameter × wall thickness) as the objective, the multi-parameter sensitivity analysis and three-dimensional finite element numerical simulation are conducted to address the effects of process parameters on the springback behaviors in 21-6-9 high-strength stainless steel tube numerical control bending. The results show that (1) springback increases with the increasing of the clearance between tube and mandrel Cm, the friction coefficient between tube and mandrel fm, the friction coefficient between tube and bending die fb, or with the decreasing of the mandrel extension length e, while the springback first increases and then remains unchanged with the increasing of the clearance between tube and bending die Cb. (2) The sensitivity of springback radius to process parameters is larger than that of springback angle. And the sensitivity of springback to process parameters from high to low are e, Cb, Cm, fb and fm. (3) The variation rules of the cross section deformation after springback with different Cm, Cb, fm, fb and e are similar to that before springback. But under same process parameters, the relative difference of the most measurement section is more than 20% and some even more than 70% before and after springback, and a platform deforming characteristics of the cross section deformation is shown after springback.

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Investigation and prediction of springback in rotary-draw tube bending process using finite element method

Cited by 12 publications

References 23 publications

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Springback prediction of three-dimensional variable curvature tube bending

Springback law of high-strength 21-6-9 stainless steel tube in numerical control bending under different process parameters

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