Joining sheets to tubes by annular sheet squeezing

Alves, L.M.; Silva, F.L.R.; Afonso, Rafael M.; Martins, P.A.F.

doi:10.1016/j.ijmachtools.2019.05.002

Cited by 13 publications

(22 citation statements)

References 9 publications

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“…In their original paper on the mechanical joining of sheets to tubes by annular sheet squeezing [22], the authors put emphasis on the influence of the cross-section recess length l of the punch on plastic material flow inside the sheet thickness. The squeezing depth d was kept constant and a deformation-zone geometry parameter sans-serifΔ=ts/l, defined as the ratio of the sheet thickness ts to the cross-section recess length l, was introduced to characterize material flow and identify the deformation modes associated with acceptable and unacceptable joints.…”

Section: Methodsmentioning

confidence: 99%

“…A representation of the deformation-assisted joining of sheets to tubes by annular sheet squeezing at the open and closed positions [22]. A photograph of a longitudinal cross section of a test specimen is enclosed.…”

Section: Figurementioning

confidence: 99%

“…All of the above-mentioned problems prompted the authors to develop a new process for fixing sheets to tubes at room temperature that is based on an entirely new mechanical joining concept in which loading is applied on the sheet surface instead of the tube itself [22]. The process is schematically shown in Figure 2, and consists of squeezing (compressing) the annular surface of the sheet adjacent to the tube in order to ensure the material from the sheet flows inwards and is shaped as a form-fit joint with good mechanical interlocking between the sheet and the tube.…”

Section: Introductionmentioning

confidence: 99%

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Deformation-Assisted Joining of Sheets to Tubes by Annular Sheet Squeezing

et al. 2019

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This paper is built upon the deformation-assisted joining of sheets to tubes, away from the tube ends, by means of a new process developed by the authors. The process is based on mechanical joining by means of form-fit joints that are obtained by annular squeezing (compression) of the sheet surfaces adjacent to the tubes. The concept is different from the fixing of sheets to tubes by applying direct loading on the tubes, as is currently done in existing deformation-assisted joining solutions. The process is carried out at room temperature and its development is a contribution towards ecological and sustainable manufacturing practices due to savings in material and energy consumption and to easier end-of-life disassembly and recycling when compared to alternative processes based on fastening, riveting, welding and adhesive bonding. The paper is focused on the main process parameters and special emphasis is put on sheet thickness, squeezing depth, and cross-section recess length of the punches. The presentation is supported by experimentation and finite element modelling, and results show that appropriate process parameters should ensure a compromise between the geometry of the mechanical interlocking and the pull-out strength of the new sheet–tube connections.

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Section: Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation-Assisted Joining of Sheets to Tubes by Annular Sheet Squeezing

et al. 2019

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“…As mentioned in the introduction, the proposed variant of the squeeze-grooving joining process can effectively connect sheets to tubes very close to the tube ends, which is impossible to achieve by means of the original squeeze-grooving joining process. 3 Figure 12 illustrates how the new sheet-tube joints are produced near the tube ends, taking advantage of the form-fit controlled geometry imposed by the mandrels and spacers. Another interesting advantage of this new type of joint is the utilization of the annular squeezing depth around the outer tube diameter to accommodate the mechanical interlocking and deliver a flat surface without protrusions of the upper tube end.…”

Section: Application To End-out Tube Jointsmentioning

confidence: 99%

“…The joining process to be presented in this paper belongs to the first group and is based on a recent development by Alves et al, 3 who proposed a new mechanical joining process for connecting a sheet to a tube away from its ends. The process, hereafter designated as ''sheet-tube joining by squeezegrooving'', is shown in Figure 1(a) and consists of indenting a sheet around a tube to create radial pressure on the outer tube surface in order to produce a groove and a form-fit interlocking.…”

Section: Introductionmentioning

confidence: 99%

Mechanical joining of sheets to tubes by squeeze-grooving

Alves

Afonso

Martins

2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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The purpose of this paper is to present a mechanical joining process to produce sheet-tube connections in a single stroke, at room temperature. The proposed solution is an enhancement of a previous joining by squeeze-grooving process that makes use of two independent mandrels and a customized spacer to control the inner joint radius and to improve its overall aesthetics. The presentation is illustrated with selected examples retrieved from experimentation and finite element modeling. Results show that the new proposed sheet-tube connections are characterized by a better redistribution of material within the joints and a very significant improvement of the pull-out strength. The proposed process also allows connecting a sheet to a tube close to the tube ends, which is impossible to achieve by means of the original joining by squeeze-grooving process.

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