Automatic tooling design for rotary draw bending of tubes

Strano, Matteo

doi:10.1007/s00170-003-2055-6

Cited by 49 publications

(15 citation statements)

References 11 publications

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“…Although several techniques can be used to bend tubing, the most popular and cost effective for bending thin walled tube is rotary draw mandrel bending. This process, seen in Figure 2.18, allows thin walled tube to be bent quickly and accurately without the undesirable side effects of tubing collapse or wrinkling [52].…”

Section: Rotary Draw Mandrel Tube Bendingmentioning

confidence: 99%

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Dual Phase Steel Characterization for Tube Bending and Hydroforming Applications

Oliver

Bowers

Green

2012

MSF

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The behaviour of dual phase steel tubes at 600, 780, and 980 MPa strength grades undergoing rotary draw bending and pressure sequence hydroforming is examined. Bending was performed using three different bend ratios. Principal strains were measured at several locations on each tube. It was found that the level of strain experienced by the tubes was independent of steel grade. The outcome of the bending process was stochastic in nature; for a given steel grade and bend ratio, some tubes were successfully formed, while others experienced failure. The proportion of failed tubes was found to increase with higher strength steel grades and tighter bend ratios. Metallographic samples from the extrados of the bent tubes revealed that many of the same microstructural features affecting strength and elongation in uniaxial tensile testing, namely martensite banding and non-metallic inclusions, affected dual phase steel tubes undergoing rotary draw bending. Additionally, a nanoindentation technique was investigated to determine the potential for more detailed microstructural characterization.

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Section: Rotary Draw Mandrel Tube Bendingmentioning

confidence: 99%

“…If the thinning on the extrados becomes too great, the tube may fracture. To evaluate the strain in the tube extrados, a plane strain assumption may be used to give a rough approximation of the axial and thickness strains [52]. The axial strain can be calculated using…”

Section: Figure 219: Schematic Of a Rotary Draw Mandrel Bender [53]mentioning

confidence: 99%

Dual Phase Steel Characterization for Tube Bending and Hydroforming Applications

Oliver

Bowers

Green

2012

MSF

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“…9) tubes are excellent candidates for aircraft/spacecraft hydraulic systems owing to their high strength to weight ratio and stiffness, excellent resistance to torsion and corrosion, good creep resistance, good weldability, and appropriate mechanical properties [3][4][5][6][7][8][9][10][11][12]. But the NC bending of titanium alloy tubes is a complicated process under multi-dies constraint, as shown in Figure 1, and these dies have directly related influence on most production failures, forming quality and forming limit [13,14]. And medium strength TA18 titanium alloy tubes have some special properties different from aluminum alloy or steel tubes, such as apparent anisotropy, high yielding and tensile strength, and low elongation at room temperance, and so on.…”

Section: Introductionmentioning

confidence: 98%

Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets

Zhan

Jiang

Yang

et al. 2011

Sci. China Technol. Sci.

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The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled (NC) technology for bending light-weight titanium alloy tubes. In order to study and develop advanced NC bending technology, it is necessary to understand the bending performance of medium strength TA18 (Ti-3Al-2.5V, ASTM Gr. 9) titanium alloy tubes during NC bending under different die sets. This paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets, including the variations in the stress, strain, wall thickness, cross sectional deformation, and defects. The results show that adding a wiper die to the base die set decreases the radial, hoop, and tangential compressive stress and the tangential compressive strain, and adding a mandrel to the base die set also decreases these stresses, but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously, and brings about a three-dimensional tensile stress concentration where the mandrel provides support. For the NC bending of medium strength TA18 tubes, the flattening of cross section is more sensitive index than the thinning of wall thickness. Introducing a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness, and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section remarkably. Considering the above effects of the mandrel and wiper die on bending performance, it is reasonable to apply the die set comprising a bending die, clamp die, and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter, in order to bend the medium strength TA18 tubes with high quality and at low cost.bending performance, medium strength titanium alloy tube, numerically controlled bending, die set Citation:Zhan M, Jiang Z Q, Yang H, et al. Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets.

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“…That is because for the tight bending process, the defects are more sensitive to the influential factors and easier to occur due to small deviations. Up to now, few papers deal with the interactive effects in bending process [1][2][3][4]. So, the relationship between wrinkling and other defects in the process is discussed analytically, and then the interactive effects of instability and other two defects are investigated by using developed FE model based on the ABAQUS/Explicit code.…”

Section: Introductionmentioning

confidence: 99%

The interactive effects of wrinkling and other defects in thin-walled tube NC bending process

Yang

Zhan

et al. 2007

Journal of Materials Processing Technology

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Automatic tooling design for rotary draw bending of tubes

Cited by 49 publications

References 11 publications

Dual Phase Steel Characterization for Tube Bending and Hydroforming Applications

Dual Phase Steel Characterization for Tube Bending and Hydroforming Applications

Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets

The interactive effects of wrinkling and other defects in thin-walled tube NC bending process

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