Control of anisotropic shape deviation in single point incremental forming of paperboard

Stein, Peter; Franke, Wilken; Hoppe, Florian; Hesse, Daniel; Mill, Katharina; Groche, Peter

doi:10.1063/1.5008087

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…While the fibers in MD get stretched like illustrated in Fig. 17 b), in CD the load, acting perpendicularly to the fiber orientation, primarily leads to a compression of the voids between the fibers, as has already been determined by Stein et al (2017). This behavior leads to a smooth radius in MD and a sharp molding, almost identical with the diameter of the SPIF-tool (15.88 mm), in CD (cf.…”

Section: Vertical Spring Backmentioning

confidence: 54%

“…Investigations regarding the maximal flange angle of paperboard for incremental forming are not known. Stein et al (2017) already used the degrees of freedom in a single point incremental forming process to compensate the anisotropic material behavior of paperboard by an adapted process strategy. However, so far neither the forming limits of paperboard in incremental forming have been determined nor the shape accuracy depending on different process parameters.…”

Section: Incremental Formingmentioning

confidence: 99%

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Forming behavior of paperboard in single point incremental forming

Stein

Franke

Elling

et al. 2019

BioRes

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An increased demand for sustainable materials has led to intensive research in the field of three-dimensional paperboard forming. To date, this work has focused on forming processes with shape-giving tools. However, individual shapes are often required, especially for large-format products. Incremental forming can be used in metal processing for small batches. In this article, the technology of incremental forming is transferred to paperboard. The results showed that elevated moisture content and a superimposed counter pressure significantly increased the forming limits. In addition, the use of polymer layers increased the shape accuracy. An extended understanding of the underlying mechanisms was achieved by analyzing the forming behavior. In uniaxial and biaxial characterization tests the influence of the moisture content on the forming behavior was investigated with conditions relevant for incremental forming. It was found that the bulge test is suitable to determine the most suitable moisture content regarding the forming limits and the spring back behavior in incremental forming. In addition, it was observed that the bearable elongations during the incremental forming of paperboard are significantly higher than in the established characterization tests. The reason for this is a compression of the fiber network during forming.

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Section: Vertical Spring Backmentioning

confidence: 54%

Section: Incremental Formingmentioning

confidence: 99%