Rib filling behavior in flow forming of thin-walled tube with helical grid-stiffened ribs

Lyu, Weitao; Zhan, Mei; Gao, Pengfei; Ma, Fei; Li, Rui; Zhang, Hongrui; Dong, Yunda

doi:10.1007/s00170-021-08613-y

Cited by 12 publications

(2 citation statements)

References 36 publications

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“…It gradually becomes the mainstream manufacturing method for components with high performance [11,12]. According to the principle of gear-generating forming, our research group proposed a new method of spin-extrusion forming (SEF) processing and built a corresponding experimental platform.…”

Section: Introductionmentioning

confidence: 99%

Analytic model of outer rib height for thin-walled cylindrical rings in Spin-Extrusion Forming processing

zhu,

Zhao,

chen

et al. 2024

Preprint

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Thin-walled cylindrical rings with outer cross ribs (TCROCR) have the advantages of lightweight, high stiffness, and high bearing capacity, which is widely used in aerospace equipment. Usually, these kinds of parts are split manufacturing with welding, and integrated manufacturing has received more attention now. Spin-extrusion forming (SEF) processing which draws inspiration from the principle of the gear-generating method is proposed and has been preliminarily applied. This method can improve rib height-width ratio and TCROCR can be formed efficiently and integrally. However, as a new method, how to design the target parts geometry and how to determine the rib limit height to meet the needs of the process still lacks systematic research. This article proposes an analytic model for predicting the rib height variation. The rib height of TCROCR is determined by two factors: one is the skin thickness reduction, which can be conveniently calculated based on the feeding amount of the feeding roll, and the other is the rib growth, which is caused by the material of the skin flowing towards the cavities. Therefore, the key to creating the analytic model is to obtain the material volume of the skin allocated to the longitudinal and transverse cavities, respectively. Utilizing Newton's second law, the proportion of material flowing into the transverse and longitudinal ribs can be correlated with the stress state of the skin, and the stress state during SEF processing can be calculated by the slab method and upper bound method. Then, the material flowing into the longitudinal ribs and transverse ribs can be obtained based on the principle of volume invariance, and the analytic model is established to predict the rib height variation. Subsequently, the accuracy of the analytic model is verified through experiments and simulations, and the growth patterns of rib height are detailed research.

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Section: Introductionmentioning

confidence: 99%

Analytic model of outer rib height for thin-walled cylindrical rings in Spin-Extrusion Forming processing

zhu,

Zhao,

chen

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…An aluminum cylinder with transverse and longitudinal inner ribs was ow-formed by Zeng et al [11], and the results show that the height of longitudinal rib was lower than that of transverse rib, meanwhile, it was found that the lling height of rib increases with the increase of the thinning rate and feed ratio. Lyu et al [12][13] revealed the asymmetric deformation phenomena during spiral inner rib ow forming based on numerical simulation, meanwhile, parameterized analysis shows that the thinning rate and feed ratio has in uence obviously on the rib height, followed by the pro le radius and attack angle of the roller.…”

Section: Introductionmentioning

confidence: 99%

Study on multi-roller flow forming process of aluminum alloy cylinders with cross ribs

Meng

Zhou

et al. 2023

Int J Adv Manuf Technol

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Multi-roller ow forming has the characteristics of multi-directional loading, which can improve the quality and accuracy of spun products. Roller number and parameter arrangement in a roller set will affect the material ow and rib lling in multi-roller ow forming of cylinder with inner ribs. Therefore, in this paper, a nite element model of multi-roller ow forming was established to explore the effects of roller number and parameter arrangement on the material ow and saturation degree of inner ribs of aluminium cylinder with oblique cross ribs. The results show that increasing roller number can promote the material radial ow, leading to improve the saturation degree of inner rib; and that, in a roller set, applying large radius for the front roller and small radius for the subsequent roller is bene cial to rib lling, and the more radial offset amount of the rst roller has, the more su cient material ow into the inner ribs is under constant total thickness reduction. In addition, an aluminum cylinder with cross ribs had been spun successfully, which had good dimensional accuracy and mechanical properties. The approaches can provide process guidance for manufacturing on ow forming of aluminum cylinder with inner ribs.

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Mechanics of tube spinning: a review

Music

Sariyarlioglu

2022

Int J Adv Manuf Technol

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Rib filling behavior in flow forming of thin-walled tube with helical grid-stiffened ribs

Cited by 12 publications

References 36 publications

Analytic model of outer rib height for thin-walled cylindrical rings in Spin-Extrusion Forming processing

Analytic model of outer rib height for thin-walled cylindrical rings in Spin-Extrusion Forming processing

Study on multi-roller flow forming process of aluminum alloy cylinders with cross ribs

Mechanics of tube spinning: a review

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