Simulation Assisted Analysis of Material Flow in Roller Clinched Joints

Rill, Daniel; Weiss, M.; Hoffmann, Hartmut; Volk, Wolfram

doi:10.4028/www.scientific.net/amr.966-967.628

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…Finally, the clinchpoint shows high asymmetry for all configurations in the longitudinal direction and is approximately symmetrical in the transversal direction. As with prior studies, undercuts and neck thicknesses on the impact side are significantly less than on the retraction side [24], Figure 6. Furthermore, the asymmetry is strongly dependent on the punch rolling radius, Figure 6.…”

Section: Neck Thickness and Undercutsupporting

confidence: 81%

Experimental investigation of the scalability of roller‐clinching processes with regard to joint strength and failure mode

Vitzthum

Hiller

Volk

2019

Materialwissenschaft Werkst

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Clinching is a joining technology, which does not need any auxiliary joining elements, and which enables a wide variety of different materials to be joined. Therefore, it fulfills the demands of multi-material lightweight design. Because of the translational tool movement, continuous joining is not possible. To overcome this disadvantage, roller clinching uses rotational tool movement. It is a novel joining technology, which combines the advantages of conventional clinching with rotary processes. Based on previous studies, the process scalability of roller clinching is investigated within this study. A comprehensive experimental parameter study is thus shown to reveal the influence of the following geometrical process parameters: roll distance, punch and die rolling radii and clinchpoint diameter. Furthermore, process limits are identified. The joint quality is evaluated using three different methods. Microsections are recorded and the joint strength is measured using pull-out as well as shear tests. The results are shown in relation to each other and connected to the particular failure mode. Finally, conclusions are derived to enable the further development of the process of roller clinching.

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Section: Neck Thickness and Undercutsupporting

confidence: 81%

Experimental investigation of the scalability of roller‐clinching processes with regard to joint strength and failure mode

Vitzthum

Hiller

Volk

2019

Materialwissenschaft Werkst

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“…In case of roller clinching, the following equation has to be fulfilled [10] 𝑑𝑑 = 𝑟𝑟 𝑝𝑝 + 𝑟𝑟 𝑑𝑑 + 𝑡𝑡 𝑏𝑏 (2) The impact angle α i of the punch (Fig. 4a) on the sheets is calculated by [11] using the nomenclature in Fig.…”

Section: Fig 3 Model For the Description Of Tool Points' Paths On A R...mentioning

confidence: 99%

“…In case of roller clinching, the kinematic conditions are further parameters. The influence of the tool rolls' radii was examined for steel-steel [9], [10], [11], [12] and steel-aluminum material combinations [11], [13]. These investigations consider the distance of the tool rolls' centers being constant.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Scalability of Roller Clinching Processes

Hiller

Vitzthum

Häcker

et al. 2018

KEM

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Roller clinching combines the advantages of translational clinching with a continuous feed of the parts to be joined. Challenging tasks are the non-perpendicular impact and retraction of the tools leading to anisotropic joint properties. These effects are strongly influenced by scaling the setup. Reducing the size of roller clinching machines increases the impact angle of the tools on the sheets. This paper focuses on the kinematic description of the tool movement as well as the joint formation depending on different setup sizes. Process limits for different setups are investigated.

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“…The main problems encountered so far have been asymmetry of the resulting clinch points and fact that the impact of the punch and its retraction are not perpendicular to the sheets being joined. In order to understand the material flow during the formation of roller-clinched joints, Rill et al [ 159 ] developed a FE simulation model and used it to study the influence of various parameters upon the material flow. The results of simulation runs were validated by comparison with results from laboratory experiments.…”

Section: Clinching Processmentioning

confidence: 99%