Study on deformation difference between the contact zone and the non-contact zone of the flexible 3D stretch bending profile and roller dies based on pre-stretching amount

Liang, Jicai; Han, Chenyu; Li, Yi; Yu, Kaifeng

doi:10.1007/s00170-020-05614-1

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Tangential friction assists in modifying stress distribution in the loading process. Liang et al [26] studied the deformation difference between the contact zone and non-contact zone of profile and roller dies. The results showed that the pre-stretching amount has no obvious effect on the profile web heights in the contact and non-contact areas.…”

Section: Introductionmentioning

confidence: 99%

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Zhang

et al. 2022

Coatings

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The contact interface friction between the specimen and the mold during the stretch-bend is a complex interactive process. Friction causes the uneven distribution of tensile stress on the specimen, which affects the plastic flow of the forming material and the spring-back after forming. In this paper, the analytical model of frictional shear stress and tensile stress distribution in the contact mold segment of the stretch and bend synchronous loading stage was established. The influence law of friction coefficient and contact mold angle on the stress–strain distribution of the specimen contact mold segment was discussed. The effect of key factors affecting the friction state of the contact interface (mold surface roughness and contact mold angle) on the shrinkage deformation of the cross-section and the tensile deformation gradient of the specimen was analyzed by equivalent stretch-bend forming experiments. The results showed that the smaller the surface roughness of the mold was, the better the friction state of the contact interface was, the plastic deformation of the specimen was more uniform, and the difference between the section shrinkage and elongation of the contact mold segment and the suspension segment was smaller. Reducing the contact mold angle of the stretch-bend can bring down the tensile stress difference at both ends of the contact mold segment of the specimen so that the section shrinkage and tensile elongation of the contact mold segment and the suspension segment tend to be consistent.

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Section: Introductionmentioning

confidence: 99%

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Zhang

et al. 2022

Coatings

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“…Precise forming of 3D curved structural parts was achieved by iteratively overbending the envelope surface of the MPD. In their subsequent investigation, they developed a flexible 3D stretch bending device and controlled the springback by adjusting positional parameters of the flexible multipoint unit to achieve greater accuracy of fit between the multipoint die and part [5][6][7]. Similarly, Li et al [8] pointed out that geometrical parameters of the multipoint dies (MPDs) influence shape accuracy and springback of the Lsection profile.…”

Section: Introductionmentioning

confidence: 99%

Improved forming accuracy through controlling localized sheet metal deformation in the friction-assisted stretch bending process

Xiang

Shu

Wang

et al. 2021

Int J Adv Manuf Technol

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Tension-dominated stress state in the stretch bending process probably leads to localized tensile stress, especially in the manufacture of thin-walled, high-strength, or complex-shaped components. That results in nonuniform residual stress distribution and inferior shape accuracy. In this paper, a friction-assisted stretch bending (FASB) process is proposed to deal with this problem. A rubber sheet is attached with sheet metal to generate tangential friction at rubber/metal interface. The tangential friction assists in modifying stress distribution in the loading process. Finite element analysis was conducted to determine the effects of process parameters on deformation behaviors of the sheet metal. The results show that a rubber sheet with hardness ranging from Shore 57D to 70D and a rubber/metal thickness ratio (ξ) value around 1.0 can effectively reduce sheet metal thinning and decrease springback in the stretching and bending stress states. By taking the simulated process parameters as a reference, fuselage profiles with variable bending curvature and sections were successfully manufactured. Maximum thinning ratio of the formed part was 6.1%, and the section deviation after unloading was reduced by 52.9%, on average, compared with conventional stretch bending. The improved forming accuracy can be attributed to the relatively uniform distribution of longitudinal stress. That results in uniform elastic recovery in longitudinal direction. Further industrial application of the FASB process for the manufacture of large-sized and complex-shaped parts will be expectable.

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“…The flexible stretch bending of multi-point roller dies (FSB-MPRD) technology is a new type of flexible three-dimensional stretch bending technology. 21,22 In the forming process of FSB-MPRD, the deformation of workpiece is mainly driven by clamps. Therefore, the movement track of the clamp has a great influence on the forming effect of workpiece.…”

Section: Introductionmentioning

confidence: 99%

Influence of movement tracks on the forming quality of profiles fabricated by flexible stretch bending of multi-point roller dies technology

Chen

Liang

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the flexible stretch bending of multi-point roller dies process, the deformation of workpiece is mainly driven by clamps. Therefore, the movement track of clamp has a great influence on the forming effect of workpiece. Y-profile, T-profile, and L-profile are taken as the research objects. Simulation and experiments are carried out with two different movement tracks. The influence of the movement tracks on shape error, springback error, and thickness variation of different profiles is discussed. The experimental results of the three profiles processed by the double-sided forming method are consistent with the simulation results, which proves the accuracy of the numerical simulation. The results show that the movement track has a great influence on shape error. Compared with double-sided forming, one-sided forming can effectively reduce springback error. The two different movement tracks have no obvious influence on thickness change.

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Study on deformation difference between the contact zone and the non-contact zone of the flexible 3D stretch bending profile and roller dies based on pre-stretching amount

Cited by 8 publications

References 18 publications

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Influence of Contact Interface Friction on Plastic Deformation of Stretch-Bend Forming

Improved forming accuracy through controlling localized sheet metal deformation in the friction-assisted stretch bending process

Influence of movement tracks on the forming quality of profiles fabricated by flexible stretch bending of multi-point roller dies technology

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