Effect of Boosting Velocity on Forming Quality of High-Strength TA18 Titanium Alloy Tubes in Numerical Control Bending

Fang, Jun; Liang, Chuang; Lu, Shi Qiang; Wang, Ke Lu

doi:10.4028/www.scientific.net/kem.748.197

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…In addition, the boosting effect improves the flow effect of the material. Many engineering practices [21,22] show that materials in the feed section can flow more rapidly to the bending section under boosting, forming a material compensation effect. That is, boosting on the tube is a coupling effect of material compensation and friction.…”

Section: Introductionmentioning

confidence: 99%

Inhibiting thinning in tube bending by a superposition effect under a boosting movement

Fang,

Wang,

Bin

et al. 2024

Int J Adv Manuf Technol

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Pressure die boost is an effective method to inhibit the thinning in the manufacturing process of aerospace tubes, and its mechanism is concerned by scholars at home and abroad. Finite element and experimental methods were conducted to analyze the tube thinning with and without boost. The effects of boosting velocity and friction on the outer wall thickness of the tube are studied. Results show that frictional force generated by the boost and the material compensation effect combine to resist the outer wall thinning during the bending process. When the boosting velocity is higher than the tube bending linear velocity, the frictional force of the boost generates a specific compressive stress, which weakens the tensile stress during the bending process of the outer wall. In the meantime, the boosting effect transfers the material from the feed section to the bending section, compensating for the thinning of the tube wall during the bending process. A new theoretical model of tube bending and thinning under boost conditions is proposed to explain this coupling effect. The relative error between the new theoretical model and the experimental value is less than 1.5%, and the accuracy is improved by 5.3% compared with the traditional no-boost condition. It overcomes the poor accuracy of the existing thinning model when fitting to boosted conditions and reveals the boosted effect's mechanism on the tube thinning.

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Section: Introductionmentioning

confidence: 99%

Inhibiting thinning in tube bending by a superposition effect under a boosting movement

Fang,

Wang,

Bin

et al. 2024

Int J Adv Manuf Technol

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show abstract

“…For the Ti-3Al-2.5V tube bending, Zhan et al 25,26 addressed the variation in wall thickness and cross-section under all kinds of process parameters, mandrel parameters and die sets of the medium strength Ti-3Al-2.5V tubes during NC bending by FE analysis, proposed a method for fast determination mandrel extension length range, obtained the optimal process parameters and die sets for the medium strength Ti-3Al-2.5V tubes in NC bending. Fang et al 27,28 numerically explored the influence laws of boosting velocity and geometric parameters such as bending angle, relative bending radius, and tube sizes on wall thinning, wall thickening, and cross-section distortion of the high strength Ti-3Al-2.5V tube during NC bending.…”

Section: Introductionmentioning

confidence: 99%

Wall thinning characteristics and prediction in numerical control bending of high strength Ti-3Al-2.5V tube

Fang

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Owing to the unique properties of high strength Ti-3Al-2.5V tube, wall thinning is prone to happen in tube bending. To accomplish tube precision bending forming, the wall thinning needs to be precisely predicted and effectively controlled. A theoretical model considering circumferential deformation was presented to reveal the inherent relationship for wall thickness distribution versus tube geometrical parameters, and its reliability was validated by published experimental results. Using finite element (FE) simulation combined with orthogonal test, the effect rules and significances of process parameters on wall thinning in numerical control (NC) bending for high strength Ti-3Al-2.5V tube were investigated. The results show that the significant factors sort from the largest to the smallest for wall thinning in tube bending as the clearance of tube versus mandrel Cm, axial feed of mandrel e, friction of tube versus mandrel fm, clearance of tube versus bending die Cb, clearance of tube versus wiper die Cw and push assistant speed of pressure die vp; the wall thinning decreases for the larger Cm and vp, while increases for the larger Cb, Cw, fm, and e. Furthermore, the prediction model of maximum wall thinning ratio was established based on the significant process parameters by multiple linear regression method. Compared with the results of orthogonal test, the relative error of that is less than 6.5%, which can be employed for rapidly predicting the wall thinning in tube bending.

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Significance analysis of process parameters on cross section distortion of high-strength TA18 tube in numerical control bending

Fang

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Effect of Boosting Velocity on Forming Quality of High-Strength TA18 Titanium Alloy Tubes in Numerical Control Bending

Cited by 4 publications

References 10 publications

Inhibiting thinning in tube bending by a superposition effect under a boosting movement

Inhibiting thinning in tube bending by a superposition effect under a boosting movement

Wall thinning characteristics and prediction in numerical control bending of high strength Ti-3Al-2.5V tube

Significance analysis of process parameters on cross section distortion of high-strength TA18 tube in numerical control bending

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