Local bending effect and its controlling methods in multi-point forming

Fu, Wenzhi; Li, Mingzhe

doi:10.1007/s00170-017-0537-1

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…FSB is a combination of flexible advanced manufacturing and the 3D bending of profiles. In order to optimize the rapid production and flexible manufacturing of this bending process, many scholars have carried out a lot of research on the formation of defects such as springback, wrinkling, section distortion and asymmetric section distortion caused by FSB [7][8][9][10][11][12][13]. However, up to now, there are still few studies on the multi-point stretch bending process of profiles, and there are still a series of problems that need to be studied urgently [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Axial Normal Stress and Bending Moment between Contact and Non-Contact Zone on Forming Accuracy for Flexible Stretch Bending Formation

Teng

Liang

Wang

et al. 2022

Metals

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Flexible 3D stretch bending (FSB) is a technology that uses multi-point molds instead of traditional integral molds to bend and deform profiles. Since the position of a multi-point mold can be adjusted in the horizontal and vertical directions, a set of molds can be used to form profile products with different contour structures. Due to the contact area and non-contact area between the multi-point mold and the surface of the profile, the forming accuracy of different areas is different. Thus, the axial normal stress and bending moment of the contact zone and non-contact zone between the profile and roller dies are studied in this article. By simulating the change in axial normal stress at the same position in the middle of a web along the axial direction, it is found that the axial normal stress shows little difference in the contact zone and non-contact zone. The value of axial normal stress in the non-contact zone is relatively stable, and there is a small increase on the side near the clamp. By simulating the axial normal stress of different cross-sections in the middle areas of three groups of webs, it is found that there is a linear relationship between the axial normal stress and the distance from inner curved surface. The bending moment of the profile in the contact zone is obviously greater than that in the non-contact zone, and the bending moment gradually decreases to near zero from the contact zone to the non-contact zone. The bending deformation of the profile in the contact zone is obviously greater than that in the non-contact zone, which results in the deviation between simulated bending displacement and theoretical bending displacement in the contact zone and non-contact zone.

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Section: Introductionmentioning

confidence: 99%

Effect of Axial Normal Stress and Bending Moment between Contact and Non-Contact Zone on Forming Accuracy for Flexible Stretch Bending Formation

Teng

Liang

Wang

et al. 2022

Metals

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“…MPF technology was utilised for rapid fabrication of 3D sheet metal parts using two reconfigurable element groups with height-adjustable pins (continuous upper and lower solid dies). 5,6 A multi-point matched-die forming technique and its typical applications were reported. 7 A flexible hybrid sheet forming process combining MPF and incremental sheet forming (ISF) was used for the control of the thickness of metal parts.…”

Section: Introductionmentioning

confidence: 99%

Measurement of forces on multi-point forming tools using fibre Bragg grating sensors

Elghawail

Pham

Huang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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Multi-point forming uses forces applied to a tool, comprising of multiple pins set at different heights, to form sheet metal for panelling in white goods, automotive bodywork, aircraft frames and so on. The use of multiple pins allows for rapid change over and flexibility in the tool making it suitable for small-batch and prototype component manufacture. To explore the relationship between ‘springback’ of the sheet metal on release from the tool, and the applied pin force, it is first necessary to understand and measure the forming forces. This article presents a novel method of measuring forming forces on individual pins in a multi-point forming tool using fibre Bragg grating sensors, monitoring the elastic strain on the selected pins during the forming process. The operating principles behind forming force measurements using fibre Bragg gratings are introduced and a relationship is developed between springback in the formed part after the final unloading and the forming force as measured on selected individual pins under different compression ratios (30%, 40%, 50% and 60%) of the elastic cushion between the tips of the pins and the workpiece. Experiments were performed to validate the proposed measuring method, and results indicate that forming forces detected by the proposed method correlated well with the results obtained by numerical simulation. This suggests the proposed method has good potential for real-time measurement and monitoring of forming force distribution in multi-point forming tools during the forming process.

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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

Liang

Han

et al. 2020

Int J Adv Manuf Technol

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Local bending effect and its controlling methods in multi-point forming

Cited by 5 publications

References 11 publications

Effect of Axial Normal Stress and Bending Moment between Contact and Non-Contact Zone on Forming Accuracy for Flexible Stretch Bending Formation

Effect of Axial Normal Stress and Bending Moment between Contact and Non-Contact Zone on Forming Accuracy for Flexible Stretch Bending Formation

Measurement of forces on multi-point forming tools using fibre Bragg grating sensors

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

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