Automatic Extraction and Conversion of the Bending Line from Parametric and Discrete Data for the Free-Form Bending Process

Scandola, Lorenzo; Maier, Daniel; Konrad Werner, Matthias; Hartmann, Christoph; Volk, Wolfram

doi:10.1007/978-3-031-06212-4_73

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The bending angle is calculated from the direction vectors of approximated straight lines at the beginning and end of the bent part. Automatic extraction of the bending line from discrete data and vice versa makes this analysis much faster and more efficient [11]. In terms of influencing factors, [12] conclude with numerical simulations and validation experiments that the yield strength affects the forming limit and wrinkling instability.…”

Section: State Of the Artmentioning

confidence: 94%

Experimental analysis on the influence of freeform bending on Barkhausen noise for steel tubes

Maier

2023

Materials Research Proceedings

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Abstract. Freeform bending with a movable die makes it possible to bend complex structures and seamless radii without changing the bending tools. Currently, most research focuses on minimizing the geometrical deviations without considering the mechanical properties of the bent tubes. A previous work showed, that the geometry can be decoupled from the mechanical properties with non-tangential bending [1]. The implementation of a soft sensor based on ultrasonic contact impedance measurements (UCI) of the property-controlled freeform bending has also been examined [2], as well as a structure for closed-loop control based on material properties [3]. The present work deals with a micro-magnetic sensor and Barkhausen noise (BHN) and investigates its suitability for the closed-loop control. For this purpose, different processing routes for freeform-bent steel tubes are experimentally investigated by their characteristic BHN. In addition to an existing simulation model, a data basis for the impact of freeform bending parameters is built to extend the existing model of a property-based closed-loop control.

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Section: State Of the Artmentioning

confidence: 94%

Experimental analysis on the influence of freeform bending on Barkhausen noise for steel tubes

Maier

2023

Materials Research Proceedings

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“…The FBF process offers a distinct advantage by enabling the integral formation of a spatial axis with continuous variable curvature in a single operation. This approach effectively circumvents the challenges associated with complex tubular member formation using traditional bending and welding processes, which often entail cumbersome procedures and high mold costs [24,25]. The FBF process could realize different bending radii without changing the bending die.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Investigation of U-R Relationship of AA6061-T6 Tubes Manufactured via Free Bending Forming Process

Abd El-Aty,

Cheng,

et al. 2023

Materials

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Forming tubes with various bending radii without changing the bending dies is much easier for the 3D free bending forming (FBF) process. In the 3D-FBF process, different bending radii were realized by adapting the eccentricities of the bending dies. The accuracy of the U-R curve is crucial for the precision forming of complex bending components. In this study, the U-R relation curve of the Al alloy tube with a specific friction coefficient, fixed geometry size, clearance between tubes, and bending die was fitted first based on the forming results of AA6061-T6 tubes under different eccentricities. Second, the U-R relationship curve based on the experiment is used to propose the U-R relationship’s mathematical formula based on many hypotheses. Finally, the modified U-R mathematical formula was applied in the finite element (FE) simulation and the actual FBF experiments for the AA6061-T6 Al alloy complex shape space bending members. The U-R relationship curve’s reliability was verified by comparing the simulation and experimental results. The results obtained from the modified U-R relationship align well with the FE modeling results and can be directly applied to the bending process for the intended components.

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Forming characteristics of thin-walled tubes manufactured by free bending process-based nontangential rotation bending die

Hu,

Cheng,

Abd El-Aty

et al. 2024

Thin-Walled Structures

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Automatic Extraction and Conversion of the Bending Line from Parametric and Discrete Data for the Free-Form Bending Process

Cited by 3 publications

References 6 publications

Experimental analysis on the influence of freeform bending on Barkhausen noise for steel tubes

Experimental analysis on the influence of freeform bending on Barkhausen noise for steel tubes

Modeling and Experimental Investigation of U-R Relationship of AA6061-T6 Tubes Manufactured via Free Bending Forming Process

Forming characteristics of thin-walled tubes manufactured by free bending process-based nontangential rotation bending die

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