Countermeasures against undesirable phenomena in the draw-bending process for extruded square tubes

Utsumi, Noah; Sakaki, Syuji

doi:10.1016/s0924-0136(01)01230-4

Cited by 45 publications

(19 citation statements)

References 3 publications

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“…The axis force from boost block can help to minimize the bend tube's wall thickness variance and deformation due to the improvement of material flow in the forming zone. For example, Utsumi and Sakaki (2002) attempted to improve the working limits in rotary draw bending using an elastic mandrel and additional axial tension. Therefore, the process needs precise coordination of various dies and strictly controlling of forming parameters.…”

Section: Description Of Twist Springback Of Thin-walled Tube In Mandrmentioning

confidence: 99%

Twist Springback of Asymmetric Thin-walled Tube in Mandrel Rotary Draw Bending Process

Xue¹,

Liao²,

Vincze³

et al. 2014

Procedia Engineering

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This paper aims to develop an effective numerical model and analyse the twist springback behaviour of asymmetric thin-walled tube in mandrel rotary draw bending. Yld2000-2d anisotropic yield criterion integrated with mixed isotropic and kinematic hardening model was used to describe the material properties including anisotropy and Bauschinger effect. The corresponding mechanical experiments such as uniaxial tension, monotonic and forward-reverse shear tests were performed to obtain the material parameters. A three-dimensional elastic-plastic finite element model was developed, and its validity was assessed by comparing the predicted twist springback with experiment one. Based on the present FE model, the tangential stress distribution during different bending steps were analysed to explore the source of twist springback. The results indicate that the torsion moment of cross sections caused by the non-homogenous stress states play a considerable role in twist springback prediction.

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Section: Description Of Twist Springback Of Thin-walled Tube In Mandrmentioning

confidence: 99%

Twist Springback of Asymmetric Thin-walled Tube in Mandrel Rotary Draw Bending Process

Xue¹,

Liao²,

Vincze³

et al. 2014

Procedia Engineering

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“…Details of the draw bending simulation can be found in the authors' previous papers. [6][7][8] 2.2 Cross-sectional shape and constitutive equations of pipe An aluminum alloy extruded pipe, A6063S-O, was assumed in the pipe used for bending. As shown in the cross section of the pipe in Fig.…”

Section: Rotary Draw Bending Modelmentioning

confidence: 99%

Effects of Reinforcing Rib on Draw Bending of Pipes Examined by Finite Element Method

Utsumi

Usuda²,

Sakaki³

2008

Mater. Trans.

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In recent years, thin aluminum alloy extruded pipes have been applied to structural parts, such as automobile space frames, to save energy. If the aluminum pipes could be processed in a greater variety of ways, such as bending, their range of applications would expand. In our previous study, we evaluated the bending of thin extruded square pipes. In the current study, we examined the bending formability of aluminum alloy pipes with reinforcing ribs using the finite element method (FEM). The influence of the reinforcing ribs on the form accuracy of the aluminum pipes in draw bending was investigated. The effective arrangement and thickness of a reinforcing rib was also investigated. As a result, it was clarified that two types of buckling arise for the reinforcing rib. Furthermore, a critical ratio T ¼ t 2 =t 1 (t 1 : the circular portion thickness of pipe; t 2 : the thickness of rib) for controlling buckling and flattening was proposed.

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“…The flexural rigidity of this mandrel is approximately 1/10000 of that of the workpiece in the elastic state. 4) …”

Section: Mechanism Of Flattening Distortionmentioning

confidence: 99%

“…In the practical bending process of sections, researchers previously reported undesirable deformation of the cross sections in stretch bending, 1) press bending, 2) the forming property in compression bending 3) and the drawbending process. 4) Basic research has dealt with the influence of material properties on the flattening in pure bending, 5) improvements on the shape distortion in the bending of circular tubes 6) and FEM (finite element method) analyses of the bending of sections and pipes. 7) Research on the deformation properties in bending was made on different thicknesses of square tubes; 8) however, there has been insufficient research on the flattening process for extruded sections, such as the deformation at the beginning of bending and the correlation of the shape of a cross section with the degree of bending, and also the wrinkling found in bending.…”

Section: Introductionmentioning

confidence: 99%

Factors Causing Undesirable Deformations during the Bending of Extruded Sections

Sakaki¹,

Utsumi

2006

Mater. Trans.

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The authors have investigated the factors causing undesirable deformations of extruded sections subjected to a quasi-uniform bending moment. These deformations include flattening distortion, wrinkling and folding. In this report, the basic mechanism of the flattening distortion of the cross section is explained and effective methods for controlling the undesirable deformation are proposed. The flattening distortion appears as a primary deformation at the beginning of the bending operation and corresponds to the shape of the cross section and the degree of bending. It is clarified that the thickness of the wall, the shape of the cross section and the position of the neutral axis influence the configuration of the flattening distortion. As an example, the bend degree of the wrinkling limit is approximately fourfold when the thickness of the workpiece is doubled.

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Countermeasures against undesirable phenomena in the draw-bending process for extruded square tubes

Cited by 45 publications

References 3 publications

Twist Springback of Asymmetric Thin-walled Tube in Mandrel Rotary Draw Bending Process

Twist Springback of Asymmetric Thin-walled Tube in Mandrel Rotary Draw Bending Process

Effects of Reinforcing Rib on Draw Bending of Pipes Examined by Finite Element Method

Factors Causing Undesirable Deformations during the Bending of Extruded Sections

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