Curvature prediction in air bending of metal sheet

Vin, Leo J. De

doi:10.1016/s0924-0136(99)00489-6

Cited by 33 publications

(23 citation statements)

References 8 publications

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“…In air bending, these variations can affect directly the accuracy of the product through errors in bending angle or in an inaccurate calculation of the bend allowance in order to known the initial developed length [2]. Springback prediction as well as final bending angle determination has captured the interest of researchers throughout the years in air bending process [1][2][3][4] as well as in V-bending [5,6], wiping die [7], U-channel [8] or draw bend test [9]. Nevertheless in air bending process, only a little form information is included in tool geometry (punch-die set), therefore in the finished part another important geometric parameter can be considered.…”

Section: Introductionmentioning

confidence: 99%

“…Its determination is not trivial, since in air bending, a bending radius bigger than punch radius can be obtained, in other words, the manufactured bending radius is not necessarily equal to punch radius, so a non-constant curvature is obtained. Several techniques can be used to measure final radius or angle: mechanically with a probe, a faceted disc or with discs of unequal size; or contactless with an overhead camera or a laser sensor [3]. However, for non-constant curvature the mechanical procedures are not of a desired accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Determining Curvature of Air Bent Parts by Digital Image Processing

2010

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The dimensional accuracy of formed components is an important issue for stamping applications. The flexibility of the air bending process involve that for different bent angles, different final bent radius are obtained. For air bending parts, springback analysis and final angle measurement have usually been considered whereas final bent radius or curvature determination is pushed into the background. Even though this parameter is a non constant geometrical feature when punch bending radius is very small and there are few mechanical methods for measuring these non constant curvatures. This paper describes the measurement procedure of final bent radius through analysis and manipulation of scanned images of bent parts. The method fits different polynomial functions on bent profiles. Once the best adjustment is chosen, a zone curvature in an air bent part is defined and the radius on punch-sheet contact is quantified. For air bending conditions of small punch radius, this technique has given good results in order to determine the main geometrical features of an air bent part: final bent angle, final bent radius and curvature zone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determining Curvature of Air Bent Parts by Digital Image Processing

2010

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“…For 3-D forming process, mainly FE modelling and simulation is used, for instance [18,19]. Modelling and simulation of brakeforming and more in particular air bending has been the focus of renewed attention during the nineties, but recent articles [20,21] and industrial projects [22] show that modelling and simulation of these processes still receives ample attention in academia and industry. Models for air bending are often FE models [23,24] or analytical models [25,26].…”

Section: Modelling and Simulation In The Process Domainmentioning

confidence: 99%

Virtual manufacturing for press line monitoring and diagnostics

Adolfsson

Sundberg

et al. 2008

International Journal of Machine Tools and Manufacture

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“…Several authors have developed analytical models for air bending processes (de Vin, 2000;Streppel et al, 2001). Asnafi (2000) proposed a model with no assumptions about the shape of the sheet.…”

Section: Analytical Thermo Mechanical Modelmentioning

confidence: 99%